QByteArray ¶

QByteArray class provides an array of bytes. 更多 …

概要 ¶

函数 ¶

def __add__ (, a2)
def __add__ (, a2)
def __add__ (arg__1)
def __add__ (arg__1)
def __add__ (arg__1)
def __eq__ (, a2)
def __eq__ (, rhs)
def __eq__ (arg__1)
def __eq__ (lhs)
def __ge__ (, a2)
def __ge__ (, rhs)
def __ge__ (arg__1)
def __ge__ (lhs)
def __getitem__ ()
def __gt__ (, a2)
def __gt__ (, rhs)
def __gt__ (arg__1)
def __gt__ (lhs)
def __iadd__ (a)
def __iadd__ (arg__1)
def __iadd__ (c)
def __le__ (, a2)
def __le__ (, rhs)
def __le__ (arg__1)
def __le__ (lhs)
def __len__ ()
def __lt__ (, a2)
def __lt__ (, a2)
def __lt__ (, rhs)
def __lt__ (arg__1)
def __lt__ (lhs)
def __mgetitem__ ()
def __msetitem__ ()
def __ne__ (, a2)
def __ne__ (, rhs)
def __ne__ (arg__1)
def __ne__ (lhs)
def __reduce__ ()
def __repr__ ()
def __setitem__ ()
def __str__ ()
def append (a)
def append (c)
def append (count, c)
def at (i)
def back ()
def capacity ()
def cbegin ()
def cend ()
def chop (n)
def chopped (len)
def clear ()
def compare (a[, cs=Qt.CaseSensitive])
def compare (c[, cs=Qt.CaseSensitive])
def contains (a)
def contains (c)
def count ()
def count (a)
def count (c)
def data ()
def endsWith (a)
def endsWith (c)
def fill (c[, size=-1])
def front ()
def indexOf (a[, from=0])
def insert (i, a)
def insert (i, count, c)
def isEmpty ()
def isLower ()
def isNull ()
def isSharedWith (other)
def isUpper ()
def lastIndexOf (a[, from=-1])
def left (len)
def leftJustified (width[, fill=’ ‘[, truncate=false]])
def length ()
def mid (index[, len=-1])
def operator= (str)
def prepend (a)
def prepend (c)
def prepend (count, c)
def remove (index, len)
def repeated (times)
def replace (before, after)
def replace (before, after)
def replace (before, after)
def replace (before, after)
def replace (index, len, s)
def reserve (size)
def resize (size)
def right (len)
def rightJustified (width[, fill=’ ‘[, truncate=false]])
def setNum (arg__1[, base=10])
def setNum (arg__1[, base=10])
def setNum (arg__1[, f=’g’[, prec=6]])
def setRawData (a, n)
def shrink_to_fit ()
def simplified ()
def size ()
def split (sep)
def squeeze ()
def startsWith (a)
def startsWith (c)
def swap (other)
def toBase64 ()
def toBase64 (options)
def toDouble ()
def toFloat ()
def toHex ()
def toHex (separator)
def toInt ([, base=10])
def toLong ([, base=10])
def toLongLong ([, base=10])
def toLower ()
def toPercentEncoding ([exclude=QByteArray()[, include=QByteArray()[, percent=’%’]]])
def toShort ([, base=10])
def toUInt ([, base=10])
def toULong ([, base=10])
def toULongLong ([, base=10])
def toUShort ([, base=10])
def toUpper ()
def trimmed ()
def truncate (pos)

静态函数 ¶

def fromBase64 (base64)
def fromBase64 (base64, options)
def fromHex (hexEncoded)
def fromPercentEncoding (pctEncoded[, percent=’%’])
def fromRawData (arg__1)
def number (arg__1[, base=10])
def number (arg__1[, base=10])
def number (arg__1[, f=’g’[, prec=6]])

详细描述 ¶

QByteArray can be used to store both raw bytes (including ‘\0’s) and traditional 8-bit ‘\0’-terminated strings. Using QByteArray is much more convenient than using const char * . Behind the scenes, it always ensures that the data is followed by a ‘\0’ terminator, and uses 隐式共享 (写入时拷贝) 以缩减内存使用量和避免不必要的数据拷贝。

除了 QByteArray , Qt also provides the QString 类以存储字符串数据。对于大多数目的， QString is the class you want to use. It stores 16-bit Unicode characters, making it easy to store non-ASCII/non-Latin-1 characters in your application. Furthermore, QString is used throughout in the Qt API. The two main cases where QByteArray is appropriate are when you need to store raw binary data, and when memory conservation is critical (e.g., with Qt for Embedded Linux).

One way to initialize a QByteArray is simply to pass a const char * to its constructor. For example, the following code creates a byte array of size 5 containing the data “Hello”:
ba = QByteArray("Hello")
											
Although the size() is 5, the byte array also maintains an extra ‘\0’ character at the end so that if a function is used that asks for a pointer to the underlying data (e.g. a call to data() ), the data pointed to is guaranteed to be ‘\0’-terminated.

QByteArray makes a deep copy of the const char * data, so you can modify it later without experiencing side effects. (If for performance reasons you don’t want to take a deep copy of the character data, use fromRawData() instead.)

Another approach is to set the size of the array using resize() and to initialize the data byte per byte. QByteArray uses 0-based indexes, just like C++ arrays. To access the byte at a particular index position, you can use operator[](). On non-const byte arrays, operator[]() returns a reference to a byte that can be used on the left side of an assignment. For example:
ba = QByteArray()
ba.resize(5)
ba[0] = 'H'
ba[1] = 'e'
ba[2] = 'l'
ba[3] = 'l'
ba[4] = 'o'
											
For read-only access, an alternative syntax is to use at() :
for i in range(0, ba.size()):
 if ba.at(i) >= 'a' and ba.at(i) <= 'f':
 print "Found character in range [a-f]"
											
at() can be faster than operator[](), because it never causes a deep copy to occur.

要一次提取多个字节，使用 left() , right() ，或 mid() .

A QByteArray can embed ‘\0’ bytes. The size() function always returns the size of the whole array, including embedded ‘\0’ bytes, but excluding the terminating ‘\0’ added by QByteArray 。例如：
QByteArray ba1("ca\0r\0t");
ba1.size(); // Returns 2.
ba1.constData(); // Returns "ca" with terminating \0.
QByteArray ba2("ca\0r\0t", 3);
ba2.size(); // Returns 3.
ba2.constData(); // Returns "ca\0" with terminating \0.
QByteArray ba3("ca\0r\0t", 4);
ba3.size(); // Returns 4.
ba3.constData(); // Returns "ca\0r" with terminating \0.
const char cart[] = {'c', 'a', '\0', 'r', '\0', 't'};
QByteArray ba4(QByteArray::fromRawData(cart, 6));
ba4.size(); // Returns 6.
ba4.constData(); // Returns "ca\0r\0t" without terminating \0.
											
If you want to obtain the length of the data up to and excluding the first ‘\0’ character, call qstrlen() on the byte array.

After a call to resize() , newly allocated bytes have undefined values. To set all the bytes to a particular value, call fill() .

To obtain a pointer to the actual character data, call data() or constData() . These functions return a pointer to the beginning of the data. The pointer is guaranteed to remain valid until a non-const function is called on the QByteArray . It is also guaranteed that the data ends with a ‘\0’ byte unless the QByteArray was created from a raw data . This ‘\0’ byte is automatically provided by QByteArray and is not counted in size() .

QByteArray provides the following basic functions for modifying the byte data: append() , prepend() , insert() , replace() ，和 remove() 。例如：
x = QByteArray("and")
x.prepend("rock ") # x == "rock and"
x.append(" roll") # x == "rock and roll"
x.replace(5, 3, "&") # x == "rock & roll"
											
replace() and remove() functions’ first two arguments are the position from which to start erasing and the number of bytes that should be erased.

When you append() data to a non-empty array, the array will be reallocated and the new data copied to it. You can avoid this behavior by calling reserve() , which preallocates a certain amount of memory. You can also call capacity() to find out how much memory QByteArray actually allocated. Data appended to an empty array is not copied.

A frequent requirement is to remove whitespace characters from a byte array (‘\n’, ‘\t’, ‘ ‘, etc.). If you want to remove whitespace from both ends of a QByteArray ，使用 trimmed() . If you want to remove whitespace from both ends and replace multiple consecutive whitespaces with a single space character within the byte array, use simplified() .

If you want to find all occurrences of a particular character or substring in a QByteArray ，使用 indexOf() or lastIndexOf() . The former searches forward starting from a given index position, the latter searches backward. Both return the index position of the character or substring if they find it; otherwise, they return -1. For example, here’s a typical loop that finds all occurrences of a particular substring:
ba = QByteArray("We must be bold, very bold")
j = 0
while (j = ba.indexOf("", j)) != -1:
 print "Found tag at index position %d" % j
 ++j
											
If you simply want to check whether a QByteArray contains a particular character or substring, use contains() . If you want to find out how many times a particular character or substring occurs in the byte array, use count() . If you want to replace all occurrences of a particular value with another, use one of the two-parameter replace() overloads.

QByteArray s can be compared using overloaded operators such as operator<(), operator<=(), operator==(), operator>=(), and so on. The comparison is based exclusively on the numeric values of the characters and is very fast, but is not what a human would expect. localeAwareCompare() is a better choice for sorting user-interface strings.

For historical reasons, QByteArray distinguishes between a null byte array and an empty byte array. A null byte array is a byte array that is initialized using QByteArray ‘s default constructor or by passing (const char *)0 to the constructor. An empty byte array is any byte array with size 0. A null byte array is always empty, but an empty byte array isn’t necessarily null:
QByteArray().isNull() # returns true
QByteArray().isEmpty() # returns true
QByteArray("").isNull() # returns false
QByteArray("").isEmpty() # returns true
QByteArray("abc").isNull() # returns false
QByteArray("abc").isEmpty() # returns false
											
All functions except isNull() treat null byte arrays the same as empty byte arrays. For example, data() returns a valid pointer ( not nullptr) to a ‘\0’ character for a byte array and QByteArray() compares equal to QByteArray (“”). We recommend that you always use isEmpty() and avoid isNull() .

最大尺寸和内存不足情况 ¶

The current version of QByteArray is limited to just under 2 GB (2^31 bytes) in size. The exact value is architecture-dependent, since it depends on the overhead required for managing the data block, but is no more than 32 bytes. Raw data blocks are also limited by the use of int type in the current version to 2 GB minus 1 byte.

In case memory allocation fails, QByteArray will throw a std::bad_alloc exception. Out of memory conditions in the Qt containers are the only case where Qt will throw exceptions.

Note that the operating system may impose further limits on applications holding a lot of allocated memory, especially large, contiguous blocks. Such considerations, the configuration of such behavior or any mitigation are outside the scope of the QByteArray API.

区域设置注意事项 ¶

数字字符串转换 ¶

Functions that perform conversions between numeric data types and strings are performed in the C locale, irrespective of the user’s locale settings. Use QString to perform locale-aware conversions between numbers and strings.

8 位字符比较 ¶

在 QByteArray , the notion of uppercase and lowercase and of which character is greater than or less than another character is done in the Latin-1 locale. This affects functions that support a case insensitive option or that compare or lowercase or uppercase their arguments. Case insensitive operations and comparisons will be accurate if both strings contain only Latin-1 characters. Functions that this affects include contains() , indexOf() , lastIndexOf() , operator<(), operator<=(), operator>(), operator>=(), isLower() , isUpper() , toLower() and toUpper() .

This issue does not apply to QString s since they represent characters using Unicode.

另请参阅

QString QBitArray

class QByteArray ¶

QByteArray(arg__1)

QByteArray(arg__1)

QByteArray(arg__1)

QByteArray(size, c)

param size

int

param arg__1

PyByteArray

param c

char

Constructs an empty byte array.

另请参阅

isEmpty()

Constructs a byte array of size size with every byte set to character ch .

另请参阅

fill()

PySide2.QtCore.QByteArray. Base64Option ¶

This enum contains the options available for encoding and decoding Base64. Base64 is defined by RFC 4648 , with the following options:

常量	描述
QByteArray.Base64Encoding	(default) The regular Base64 alphabet, called simply “base64”
QByteArray.Base64UrlEncoding	An alternate alphabet, called “base64url”, which replaces two characters in the alphabet to be more friendly to URLs.
QByteArray.KeepTrailingEquals	(default) Keeps the trailing padding equal signs at the end of the encoded data, so the data is always a size multiple of four.
QByteArray.OmitTrailingEquals	Omits adding the padding equal signs at the end of the encoded data.
QByteArray.IgnoreBase64DecodingErrors	When decoding Base64-encoded data, ignores errors in the input; invalid characters are simply skipped. This enum value has been added in Qt 5.15.
QByteArray.AbortOnBase64DecodingErrors	When decoding Base64-encoded data, stops at the first decoding error. This enum value has been added in Qt 5.15.

fromBase64Encoding() and fromBase64() ignore the and options. If the option is specified, they will not flag errors in case trailing equal signs are missing or if there are too many of them. If instead the is specified, then the input must either have no padding or have the correct amount of equal signs.

New in version 5.2.

PySide2.QtCore.QByteArray. __getitem__ ( ) ¶

PySide2.QtCore.QByteArray. __len__ ( ) ¶

PySide2.QtCore.QByteArray. __mgetitem__ ( ) ¶

PySide2.QtCore.QByteArray. __msetitem__ ( ) ¶

PySide2.QtCore.QByteArray. __reduce__ ( ) ¶

返回类型: PyObject

PySide2.QtCore.QByteArray. __repr__ ( ) ¶

返回类型: PyObject

PySide2.QtCore.QByteArray. __setitem__ ( ) ¶

PySide2.QtCore.QByteArray. __str__ ( ) ¶

返回类型: PyObject

PySide2.QtCore.QByteArray. append ( c ) ¶

参数: c – char
返回类型: QByteArray

这是重载函数。

追加字符 ch 到此字节数组。

PySide2.QtCore.QByteArray. append ( a ) ¶

参数: a – QByteArray
返回类型: QByteArray

PySide2.QtCore.QByteArray. append ( count , c ) ¶

参数

count – int
c – char

返回类型

QByteArray

这是重载函数。

追加 count copies of character ch 到此字节数组，并返回此字节数组的引用。

若 count is negative or zero nothing is appended to the byte array.

PySide2.QtCore.QByteArray. at ( i ) ¶

参数: i – int
返回类型: char

Returns the character at index position i in the byte array.

i must be a valid index position in the byte array (i.e., 0 <= i < size() ).

另请参阅

operator[]()

PySide2.QtCore.QByteArray. back ( ) ¶

返回类型: char

Returns the last character in the byte array. Same as at(size() - 1) .

This function is provided for STL compatibility.

警告

Calling this function on an empty byte array constitutes undefined behavior.

另请参阅

front() at() operator[]()

PySide2.QtCore.QByteArray. capacity ( ) ¶

返回类型: int

Returns the maximum number of bytes that can be stored in the byte array without forcing a reallocation.

The sole purpose of this function is to provide a means of fine tuning QByteArray ‘s memory usage. In general, you will rarely ever need to call this function. If you want to know how many bytes are in the byte array, call size() .

另请参阅

reserve() squeeze()

PySide2.QtCore.QByteArray. cbegin ( ) ¶

返回类型: str

返回常量 STL 样式迭代器 pointing to the first character in the byte-array.

另请参阅

begin() cend()

PySide2.QtCore.QByteArray. cend ( ) ¶

返回类型: str

返回常量 STL 样式迭代器 pointing to the imaginary character after the last character in the list.

另请参阅

cbegin() end()

PySide2.QtCore.QByteArray. chop ( n ) ¶

参数: n – int

移除 n bytes from the end of the byte array.

若 n 大于 size() , the result is an empty byte array.

范例：

												ba = QByteArray("STARTTLS\r\n")
ba.chop(2)                 # ba == "STARTTLS"

另请参阅

truncate() resize() left()

PySide2.QtCore.QByteArray. chopped ( len ) ¶

参数: len – int
返回类型: QByteArray

返回的字节数组包含最左 size() - len 字节在此字节数组。

注意

The behavior is undefined if len is negative or greater than size() .

另请参阅

endsWith() left() right() mid() chop() truncate()

PySide2.QtCore.QByteArray. clear ( ) ¶: Clears the contents of the byte array and makes it null.

另请参阅

resize() isNull()

PySide2.QtCore.QByteArray. compare ( a [ , cs=Qt.CaseSensitive ] ) ¶

参数

a – QByteArray
cs – CaseSensitivity

返回类型

int

PySide2.QtCore.QByteArray. compare ( c [ , cs=Qt.CaseSensitive ] ) ¶

参数

c – str
cs – CaseSensitivity

返回类型

int

Returns an integer less than, equal to, or greater than zero depending on whether this QByteArray sorts before, at the same position, or after the string pointed to by c . The comparison is performed according to case sensitivity cs .

另请参阅

operator==

PySide2.QtCore.QByteArray. contains ( c ) ¶

参数: c – char
返回类型: bool

这是重载函数。

返回 true if the byte array contains the character ch ；否则返回 false .

PySide2.QtCore.QByteArray. contains ( a ) ¶

参数: a – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. count ( ) ¶

返回类型: int

这是重载函数。

如同 size() .

PySide2.QtCore.QByteArray. count ( c ) ¶

参数: c – char
返回类型: int

这是重载函数。

Returns the number of occurrences of character ch in the byte array.

另请参阅

contains() indexOf()

PySide2.QtCore.QByteArray. count ( a ) ¶

参数: a – QByteArray
返回类型: int

PySide2.QtCore.QByteArray. data ( ) ¶

返回类型: str

这是重载函数。

PySide2.QtCore.QByteArray. endsWith ( c ) ¶

参数: c – char
返回类型: bool

这是重载函数。

返回 true if this byte array ends with character ch ；否则返回 false .

PySide2.QtCore.QByteArray. endsWith ( a ) ¶

参数: a – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. fill ( c [ , size=-1 ] ) ¶

参数

c – char
size – int

返回类型

QByteArray

Sets every byte in the byte array to character ch 。若 size is different from -1 (the default), the byte array is resized to size size beforehand.

范例：

												ba = QByteArray("Istambul")
ba.fill('o')
# ba == "oooooooo"
ba.fill('X', 2)
# ba == "XX"
												
											

另请参阅

resize()

static PySide2.QtCore.QByteArray. fromBase64 ( base64 ) ¶

参数: base64 – QByteArray
返回类型: QByteArray

这是重载函数。

Returns a decoded copy of the Base64 array base64 . Input is not checked for validity; invalid characters in the input are skipped, enabling the decoding process to continue with subsequent characters.

例如：

												text = QByteArray.fromBase64("UXQgaXMgZ3JlYXQh")
text.data()            # returns "Qt is great!"

The algorithm used to decode Base64-encoded data is defined in RFC 4648 .

注意

fromBase64Encoding() function is recommended in new code.

另请参阅

toBase64() fromBase64Encoding()

static PySide2.QtCore.QByteArray. fromBase64 ( base64 , options ) ¶

参数

base64 – QByteArray
options – Base64Options

返回类型

QByteArray

这是重载函数。

Returns a decoded copy of the Base64 array base64 , using the options defined by options 。若 options contains IgnoreBase64DecodingErrors (the default), the input is not checked for validity; invalid characters in the input are skipped, enabling the decoding process to continue with subsequent characters. If options contains AbortOnBase64DecodingErrors , then decoding will stop at the first invalid character.

例如：

												QByteArray::fromBase64("PHA+SGVsbG8/PC9wPg==", QByteArray::Base64Encoding); // returns "<p>Hello?</p>"
QByteArray::fromBase64("PHA-SGVsbG8_PC9wPg==", QByteArray::Base64UrlEncoding); // returns "<p>Hello?</p>"

The algorithm used to decode Base64-encoded data is defined in RFC 4648 .

Returns the decoded data, or, if the AbortOnBase64DecodingErrors option was passed and the input data was invalid, an empty byte array.

注意

fromBase64Encoding() function is recommended in new code.

另请参阅

toBase64() fromBase64Encoding()

static PySide2.QtCore.QByteArray. fromHex ( hexEncoded ) ¶

参数: hexEncoded – QByteArray
返回类型: QByteArray

Returns a decoded copy of the hex encoded array hexEncoded . Input is not checked for validity; invalid characters in the input are skipped, enabling the decoding process to continue with subsequent characters.

例如：

												text = QByteArray.fromHex("517420697320677265617421")
text.data()            # returns "Qt is great!"

另请参阅

toHex()

static PySide2.QtCore.QByteArray. fromPercentEncoding ( pctEncoded [ , percent='%' ] ) ¶

参数

pctEncoded – QByteArray
percent – char

返回类型

QByteArray

Returns a decoded copy of the URI/URL-style percent-encoded input 。 percent parameter allows you to replace the ‘%’ character for another (for instance, ‘_’ or ‘=’).

例如：

												QByteArray text = QByteArray::fromPercentEncoding("Qt%20is%20great%33");
text.data();            // returns "Qt is great!"

注意

Given invalid input (such as a string containing the sequence “%G5”, which is not a valid hexadecimal number) the output will be invalid as well. As an example: the sequence “%G5” could be decoded to ‘W’.

另请参阅

toPercentEncoding() fromPercentEncoding()

static PySide2.QtCore.QByteArray. fromRawData ( arg__1 ) ¶

参数: arg__1 – str
返回类型: QByteArray

构造 QByteArray that uses the first size bytes of the data array. The bytes are not copied. The QByteArray will contain the data pointer. The caller guarantees that data will not be deleted or modified as long as this QByteArray and any copies of it exist that have not been modified. In other words, because QByteArray 是隐式共享 class and the instance returned by this function contains the data pointer, the caller must not delete data or modify it directly as long as the returned QByteArray and any copies exist. However, QByteArray 未拥有所有权对于 data , so the QByteArray destructor will never delete the raw data , even when the last QByteArray referring to data 被销毁。

A subsequent attempt to modify the contents of the returned QByteArray or any copy made from it will cause it to create a deep copy of the data array before doing the modification. This ensures that the raw data array itself will never be modified by QByteArray .

Here is an example of how to read data using a QDataStream on raw data in memory without copying the raw data into a QByteArray :

												mydata = '\x00\x00\x03\x84\x78\x9c\x3b\x76'\
         '\xec\x18\xc3\x31\x0a\xf1\xcc\x99'\
         ...
         '\x6d\x5b'
data = QByteArray.fromRawData(mydata)
in_ = QDataStream(data, QIODevice.ReadOnly)
...
												
											

警告

A byte array created with is not ‘\0’-terminated, unless the raw data contains a 0 character at position size . While that does not matter for QDataStream or functions like indexOf() , passing the byte array to a function accepting a const char * expected to be ‘\0’-terminated will fail.

另请参阅

setRawData() data() constData()

PySide2.QtCore.QByteArray. front ( ) ¶

返回类型: char

Returns the first character in the byte array. Same as at(0) .

This function is provided for STL compatibility.

警告

Calling this function on an empty byte array constitutes undefined behavior.

另请参阅

back() at() operator[]()

PySide2.QtCore.QByteArray. indexOf ( a [ , from=0 ] ) ¶

参数

a – QByteArray
from – int

返回类型

int

PySide2.QtCore.QByteArray. insert ( i , a ) ¶

参数

i – int
a – QByteArray

返回类型

QByteArray

PySide2.QtCore.QByteArray. insert ( i , count , c ) ¶

参数

i – int
count – int
c – char

返回类型

QByteArray

这是重载函数。

插入 count copies of character ch at index position i in the byte array.

若 i 大于 size() , the array is first extended using resize() .

PySide2.QtCore.QByteArray. isEmpty ( ) ¶

返回类型: bool

返回 true if the byte array has size 0; otherwise returns false .

范例：

												QByteArray().isEmpty()         # returns true
QByteArray("").isEmpty()       # returns true
QByteArray("abc").isEmpty()    # returns false
												
											

另请参阅

size()

PySide2.QtCore.QByteArray. isLower ( ) ¶

返回类型: bool

返回 true if this byte array contains only lowercase letters, otherwise returns false . The byte array is interpreted as a Latin-1 encoded string.

另请参阅

isUpper() toLower()

PySide2.QtCore.QByteArray. isNull ( ) ¶

返回类型: bool

返回 true if this byte array is null; otherwise returns false .

范例：

												QByteArray().isNull()          # returns true
QByteArray("").isNull()        # returns false
QByteArray("abc").isNull()     # returns false
												
											

Qt makes a distinction between null byte arrays and empty byte arrays for historical reasons. For most applications, what matters is whether or not a byte array contains any data, and this can be determined using isEmpty() .

另请参阅

isEmpty()

PySide2.QtCore.QByteArray. isSharedWith ( other ) ¶

参数: other – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. isUpper ( ) ¶

返回类型: bool

返回 true if this byte array contains only uppercase letters, otherwise returns false . The byte array is interpreted as a Latin-1 encoded string.

另请参阅

isLower() toUpper()

PySide2.QtCore.QByteArray. lastIndexOf ( a [ , from=-1 ] ) ¶

参数

a – QByteArray
from – int

返回类型

int

PySide2.QtCore.QByteArray. left ( len ) ¶

参数: len – int
返回类型: QByteArray

返回的字节数组包含最左 len 字节在此字节数组。

返回整个字节数组若 len 大于 size() .

范例：

												x = QByteArray("Pineapple")
y = x.left(4)
# y == "Pine"
												
											

另请参阅

startsWith() right() mid() chopped() chop() truncate()

PySide2.QtCore.QByteArray. leftJustified ( width [ , fill=' ' [ , truncate=false ] ] ) ¶

参数

width – int
fill – char
truncate – bool

返回类型

QByteArray

Returns a byte array of size width that contains this byte array padded by the fill character.

若 truncate is false and the size() of the byte array is more than width , then the returned byte array is a copy of this byte array.

若 truncate is true and the size() of the byte array is more than width , then any bytes in a copy of the byte array after position width are removed, and the copy is returned.

范例：

												x = QByteArray("apple")
y = x.leftJustified(8, '.')   # y == "apple..."

另请参阅

rightJustified()

PySide2.QtCore.QByteArray. length ( ) ¶

返回类型: int

如同 size() .

PySide2.QtCore.QByteArray. mid ( index [ , len=-1 ] ) ¶

参数

index – int
len – int

返回类型

QByteArray

Returns a byte array containing len bytes from this byte array, starting at position pos .

若 len is -1 (the default), or pos + len >= size() , returns a byte array containing all bytes starting at position pos until the end of the byte array.

范例：

												x = QByteArray("Five pineapples")
y = x.mid(5, 4)     # y == "pine"
z = x.mid(5)        # z == "pineapples"
												
											

另请参阅

left() right() chopped() chop() truncate()

static PySide2.QtCore.QByteArray. number ( arg__1 [ , f='g' [ , prec=6 ] ] ) ¶

参数

arg__1 – double
f – char
prec – int

返回类型

QByteArray

这是重载函数。

Returns a byte array that contains the printed value of n , formatted in format f with precision prec .

Argument n is formatted according to the f format specified, which is g by default, and can be any of the following:

格式	含义
`e`	format as [-]9.9e[+\|-]999
`E`	format as [-]9.9E[+\|-]999
`f`	format as [-]9.9
`g`	use `e` or `f` format, whichever is the most concise
`G`	use `E` or `f` format, whichever is the most concise

With ‘e’, ‘E’, and ‘f’, prec is the number of digits after the decimal point. With ‘g’ and ‘G’, prec is the maximum number of significant digits (trailing zeroes are omitted).

												ba = QByteArray.number(12.3456, 'E', 3)
# ba == 1.235E+01

注意

The format of the number is not localized; the default C locale is used irrespective of the user’s locale.

另请参阅

toDouble()

static PySide2.QtCore.QByteArray. number ( arg__1 [ , base=10 ] ) ¶

参数

arg__1 – int
base – int

返回类型

QByteArray

Returns a byte array containing the string equivalent of the number n to base base (10 by default). The base can be any value between 2 and 36.

范例：

												n = 63;
QByteArray.number(n)               # returns "63"
QByteArray.number(n, 16)           # returns "3f"
QByteArray.number(n, 16).toUpper() # returns "3F"
												
											

注意

The format of the number is not localized; the default C locale is used irrespective of the user’s locale.

另请参阅

setNum() toInt()

static PySide2.QtCore.QByteArray. number ( arg__1 [ , base=10 ] ) ¶

参数

arg__1 – qlonglong
base – int

返回类型

QByteArray

这是重载函数。

另请参阅

toLongLong()

PySide2.QtCore.QByteArray. __ne__ ( arg__1 ) ¶

参数: arg__1 – PyUnicode

PySide2.QtCore.QByteArray. __ne__ ( a2 ) ¶

参数: a2 – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. __ne__ ( lhs ) ¶

参数: lhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __ne__ ( rhs ) ¶

参数: rhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __add__ ( a2 ) ¶

参数: a2 – QByteArray
返回类型: QByteArray

PySide2.QtCore.QByteArray. __add__ ( a2 ) ¶

参数: a2 – char
返回类型: QByteArray

PySide2.QtCore.QByteArray. __add__ ( arg__1 ) ¶

参数: arg__1 – PyBytes

PySide2.QtCore.QByteArray. __add__ ( arg__1 ) ¶

参数: arg__1 – PyByteArray
返回类型: QByteArray

PySide2.QtCore.QByteArray. __add__ ( arg__1 ) ¶

参数: arg__1 – PyByteArray
返回类型: QByteArray

PySide2.QtCore.QByteArray. __iadd__ ( arg__1 ) ¶

参数: arg__1 – PyByteArray
返回类型: QByteArray

PySide2.QtCore.QByteArray. __iadd__ ( c ) ¶

参数: c – char
返回类型: QByteArray

这是重载函数。

追加字符 ch onto the end of this byte array and returns a reference to this byte array.

PySide2.QtCore.QByteArray. __iadd__ ( a ) ¶

参数: a – QByteArray
返回类型: QByteArray

PySide2.QtCore.QByteArray. __lt__ ( a2 ) ¶

参数: a2 – str
返回类型: bool

PySide2.QtCore.QByteArray. __lt__ ( rhs ) ¶

参数: rhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __lt__ ( a2 ) ¶

参数: a2 – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. __lt__ ( arg__1 ) ¶

参数: arg__1 – PyUnicode

PySide2.QtCore.QByteArray. __lt__ ( lhs ) ¶

参数: lhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __le__ ( rhs ) ¶

参数: rhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __le__ ( lhs ) ¶

参数: lhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __le__ ( a2 ) ¶

参数: a2 – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. __le__ ( arg__1 ) ¶

参数: arg__1 – PyUnicode

PySide2.QtCore.QByteArray.operator=(str)

参数: str – str
返回类型: QByteArray

这是重载函数。

赋值 str 到此字节数组。

PySide2.QtCore.QByteArray. __eq__ ( rhs ) ¶

参数: rhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __eq__ ( lhs ) ¶

参数: lhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __eq__ ( a2 ) ¶

参数: a2 – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. __eq__ ( arg__1 ) ¶

参数: arg__1 – PyUnicode

PySide2.QtCore.QByteArray. __gt__ ( arg__1 ) ¶

参数: arg__1 – PyUnicode

PySide2.QtCore.QByteArray. __gt__ ( a2 ) ¶

参数: a2 – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. __gt__ ( lhs ) ¶

参数: lhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __gt__ ( rhs ) ¶

参数: rhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __ge__ ( arg__1 ) ¶

参数: arg__1 – PyUnicode

PySide2.QtCore.QByteArray. __ge__ ( rhs ) ¶

参数: rhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. __ge__ ( a2 ) ¶

参数: a2 – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. __ge__ ( lhs ) ¶

参数: lhs – QStringRef
返回类型: bool

PySide2.QtCore.QByteArray. prepend ( c ) ¶

参数: c – char
返回类型: QByteArray

这是重载函数。

前置字符 ch 到此字节数组。

PySide2.QtCore.QByteArray. prepend ( a ) ¶

参数: a – QByteArray
返回类型: QByteArray

PySide2.QtCore.QByteArray. prepend ( count , c ) ¶

参数

count – int
c – char

返回类型

QByteArray

这是重载函数。

前置 count copies of character ch 到此字节数组。

PySide2.QtCore.QByteArray. remove ( index , len ) ¶

参数

index – int
len – int

返回类型

QByteArray

移除 len bytes from the array, starting at index position pos , and returns a reference to the array.

若 pos is out of range, nothing happens. If pos is valid, but pos + len is larger than the size of the array, the array is truncated at position pos .

范例：

												ba = QByteArray("Montreal")
ba.remove(1, 4)
# ba == "Meal"
												
											

另请参阅

insert() replace()

PySide2.QtCore.QByteArray. repeated ( times ) ¶

参数: times – int
返回类型: QByteArray

Returns a copy of this byte array repeated the specified number of times .

若 times is less than 1, an empty byte array is returned.

范例：

												QByteArray ba("ab");
ba.repeated(4);             // returns "abababab"

PySide2.QtCore.QByteArray. replace ( index , len , s ) ¶

参数

index – int
len – int
s – QByteArray

返回类型

QByteArray

PySide2.QtCore.QByteArray. replace ( before , after ) ¶

参数

before – unicode
after – QByteArray

返回类型

QByteArray

PySide2.QtCore.QByteArray. replace ( before , after ) ¶

参数

before – char
after – char

返回类型

QByteArray

这是重载函数。

Replaces every occurrence of the character before with the character after .

PySide2.QtCore.QByteArray. replace ( before , after ) ¶

参数

before – char
after – QByteArray

返回类型

QByteArray

PySide2.QtCore.QByteArray. replace ( before , after ) ¶

参数

before – QByteArray
after – QByteArray

返回类型

QByteArray

PySide2.QtCore.QByteArray. reserve ( size ) ¶

参数: size – int

Attempts to allocate memory for at least size bytes. If you know in advance how large the byte array will be, you can call this function, and if you call resize() often you are likely to get better performance. If size is an underestimate, the worst that will happen is that the QByteArray will be a bit slower.

The sole purpose of this function is to provide a means of fine tuning QByteArray ‘s memory usage. In general, you will rarely ever need to call this function. If you want to change the size of the byte array, call resize() .

另请参阅

squeeze() capacity()

PySide2.QtCore.QByteArray. resize ( size ) ¶

参数: size – int

把字节数组的尺寸设为 size 字节。

若 size is greater than the current size, the byte array is extended to make it size bytes with the extra bytes added to the end. The new bytes are uninitialized.

若 size is less than the current size, bytes are removed from the end.

另请参阅

size() truncate()

PySide2.QtCore.QByteArray. right ( len ) ¶

参数: len – int
返回类型: QByteArray

返回的字节数组包含最右 len 字节在此字节数组。

返回整个字节数组若 len 大于 size() .

范例：

												x = QByteArray("Pineapple")
y = x.right(5)
# y == "apple"
												
											

另请参阅

endsWith() left() mid() chopped() chop() truncate()

PySide2.QtCore.QByteArray. rightJustified ( width [ , fill=' ' [ , truncate=false ] ] ) ¶

参数

width – int
fill – char
truncate – bool

返回类型

QByteArray

Returns a byte array of size width that contains the fill character followed by this byte array.

若 truncate is false and the size of the byte array is more than width , then the returned byte array is a copy of this byte array.

若 truncate is true and the size of the byte array is more than width , then the resulting byte array is truncated at position width .

范例：

												x = QByteArray("apple")
y = x.rightJustified(8, '.')    # y == "...apple"

另请参阅

leftJustified()

PySide2.QtCore.QByteArray. setNum ( arg__1 [ , base=10 ] ) ¶

参数

arg__1 – qlonglong
base – int

返回类型

QByteArray

这是重载函数。

另请参阅

toLongLong()

PySide2.QtCore.QByteArray. setNum ( arg__1 [ , base=10 ] ) ¶

参数

arg__1 – int
base – int

返回类型

QByteArray

Sets the byte array to the printed value of n in base base (10 by default) and returns a reference to the byte array. The base can be any value between 2 and 36. For bases other than 10, n is treated as an unsigned integer.

范例：

												ba = QByteArray()
n = 63
ba.setNum(n)           # ba == "63"
ba.setNum(n, 16)       # ba == "3f"
												
											

注意

The format of the number is not localized; the default C locale is used irrespective of the user’s locale.

另请参阅

number() toInt()

PySide2.QtCore.QByteArray. setNum ( arg__1 [ , f='g' [ , prec=6 ] ] ) ¶

参数

arg__1 – double
f – char
prec – int

返回类型

QByteArray

这是重载函数。

Sets the byte array to the printed value of n , formatted in format f with precision prec , and returns a reference to the byte array.

格式 f 可以是下列任一：

格式	含义
`e`	format as [-]9.9e[+\|-]999
`E`	format as [-]9.9E[+\|-]999
`f`	format as [-]9.9
`g`	use `e` or `f` format, whichever is the most concise
`G`	use `E` or `f` format, whichever is the most concise

With ‘e’, ‘E’, and ‘f’, prec is the number of digits after the decimal point. With ‘g’ and ‘G’, prec is the maximum number of significant digits (trailing zeroes are omitted).

注意

The format of the number is not localized; the default C locale is used irrespective of the user’s locale.

另请参阅

toDouble()

PySide2.QtCore.QByteArray. setRawData ( a , n ) ¶

参数

a – str
n – uint

返回类型

QByteArray

Resets the QByteArray to use the first size bytes of the data array. The bytes are not copied. The QByteArray will contain the data pointer. The caller guarantees that data will not be deleted or modified as long as this QByteArray and any copies of it exist that have not been modified.

This function can be used instead of fromRawData() to re-use existing QByteArray objects to save memory re-allocations.

另请参阅

fromRawData() data() constData()

PySide2.QtCore.QByteArray. shrink_to_fit ( ) ¶: 此函数是为兼容 STL 而提供的。它相当于 squeeze() .

PySide2.QtCore.QByteArray. simplified ( ) ¶

返回类型: QByteArray

Returns a byte array that has whitespace removed from the start and the end, and which has each sequence of internal whitespace replaced with a single space.

Whitespace means any character for which the standard C++ isspace() function returns true in the C locale. This includes the ASCII isspace() function returns true in the C locale. This includes the ASCII characters ‘\t’, ‘\n’, ‘\v’, ‘\f’, ‘\r’, and ‘ ‘.

范例：

												ba = QByteArray("  lots\t of\nwhitespace\r\n ")
ba = ba.simplified()
# ba == "lots of whitespace";
												
											

另请参阅

trimmed()

PySide2.QtCore.QByteArray. size ( ) ¶

返回类型: int

返回此字节数组的字节数。

The last byte in the byte array is at position - 1. In addition, QByteArray ensures that the byte at position is always ‘\0’, so that you can use the return value of data() and constData() as arguments to functions that expect ‘\0’-terminated strings. If the QByteArray object was created from a raw data that didn’t include the trailing null-termination character then QByteArray doesn’t add it automaticall unless the deep copy is created.

范例：

												ba = QByteArray("Hello")
n = ba.size()          # n == 5
ba.data()[0]           # returns 'H'
ba.data()[4]           # returns 'o'
												
											

另请参阅

isEmpty() resize()

PySide2.QtCore.QByteArray. split ( sep ) ¶

参数: sep – char
返回类型

Splits the byte array into subarrays wherever sep occurs, and returns the list of those arrays. If sep does not match anywhere in the byte array, returns a single-element list containing this byte array.

PySide2.QtCore.QByteArray. squeeze ( ) ¶

Releases any memory not required to store the array’s data.

The sole purpose of this function is to provide a means of fine tuning QByteArray ‘s memory usage. In general, you will rarely ever need to call this function.

另请参阅

reserve() capacity()

PySide2.QtCore.QByteArray. startsWith ( c ) ¶

参数: c – char
返回类型: bool

这是重载函数。

返回 true if this byte array starts with character ch ；否则返回 false .

PySide2.QtCore.QByteArray. startsWith ( a ) ¶

参数: a – QByteArray
返回类型: bool

PySide2.QtCore.QByteArray. swap ( other ) ¶

参数: other – QByteArray

Swaps byte array other with this byte array. This operation is very fast and never fails.

PySide2.QtCore.QByteArray. toBase64 ( ) ¶

返回类型: QByteArray

Returns a copy of the byte array, encoded as Base64.

												text = QByteArray("Qt is great!")
text.toBase64()        # returns "UXQgaXMgZ3JlYXQh"

The algorithm used to encode Base64-encoded data is defined in RFC 4648 .

另请参阅

fromBase64()

PySide2.QtCore.QByteArray. toBase64 ( options ) ¶

参数: options – Base64Options
返回类型: QByteArray

这是重载函数。

Returns a copy of the byte array, encoded using the options options .

												QByteArray text("<p>Hello?</p>");
text.toBase64(QByteArray::Base64Encoding | QByteArray::OmitTrailingEquals);      // returns "PHA+SGVsbG8/PC9wPg"
text.toBase64(QByteArray::Base64Encoding);                                       // returns "PHA+SGVsbG8/PC9wPg=="
text.toBase64(QByteArray::Base64UrlEncoding);                                    // returns "PHA-SGVsbG8_PC9wPg=="
text.toBase64(QByteArray::Base64UrlEncoding | QByteArray::OmitTrailingEquals);   // returns "PHA-SGVsbG8_PC9wPg"
												
											

The algorithm used to encode Base64-encoded data is defined in RFC 4648 .

另请参阅

fromBase64()

PySide2.QtCore.QByteArray. toDouble ( ) ¶

返回类型: double

Returns the byte array converted to a double 值。

Returns an infinity if the conversion overflows or 0.0 if the conversion fails for other reasons (e.g. underflow).

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

												string = QByteArray("1234.56")
(a, ok) = string.toDouble()   # a == 1234.56, ok == true

警告

QByteArray content may only contain valid numerical characters which includes the plus/minus sign, the character e used in scientific notation, and the decimal point. Including the unit or additional characters leads to a conversion error.

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

This function ignores leading and trailing whitespace.

另请参阅

number()

PySide2.QtCore.QByteArray. toFloat ( ) ¶

返回类型: float

Returns the byte array converted to a float 值。

Returns an infinity if the conversion overflows or 0.0 if the conversion fails for other reasons (e.g. underflow).

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

												QByteArray string("1234.56");
bool ok;
float a = string.toFloat(&ok);    // a == 1234.56, ok == true
string = "1234.56 Volt";
a = str.toFloat(&ok);              // a == 0, ok == false
												
											

警告

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

This function ignores leading and trailing whitespace.

另请参阅

number()

PySide2.QtCore.QByteArray. toHex ( ) ¶

返回类型: QByteArray

Returns a hex encoded copy of the byte array. The hex encoding uses the numbers 0-9 and the letters a-f.

另请参阅

fromHex()

PySide2.QtCore.QByteArray. toHex ( separator ) ¶

参数: separator – char
返回类型: QByteArray

这是重载函数。

Returns a hex encoded copy of the byte array. The hex encoding uses the numbers 0-9 and the letters a-f.

若 separator is not ‘\0’, the separator character is inserted between the hex bytes.

范例：

												QByteArray macAddress = QByteArray::fromHex("123456abcdef");
macAddress.toHex(':'); // returns "12:34:56:ab:cd:ef"
macAddress.toHex(0);   // returns "123456abcdef"
												
											

另请参阅

fromHex()

PySide2.QtCore.QByteArray. toInt ( [ base=10 ] ) ¶

参数: base – int
返回类型: int

Returns the byte array converted to an int using base base , which is 10 by default and must be between 2 and 36, or 0.

若 base is 0, the base is determined automatically using the following rules: If the byte array begins with “0x”, it is assumed to be hexadecimal; if it begins with “0”, it is assumed to be octal; otherwise it is assumed to be decimal.

返回 0，若转换失败。

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

												string = QByteArray("FF")
(hex, ok) = string.toInt(16)   # hex == 255, ok == true
(dec, ok) = string.toInt(10)   # dec == 0, ok == false
												
											

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

另请参阅

number()

PySide2.QtCore.QByteArray. toLong ( [ base=10 ] ) ¶

参数: base – int
返回类型: long

Returns the byte array converted to a long int using base base , which is 10 by default and must be between 2 and 36, or 0.

返回 0，若转换失败。

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

												string = QByteArray("FF")
(hex, ok) = str.toLong(16);    # hex == 255, ok == true
(dec, ok) = str.toLong(10);    # dec == 0, ok == false
												
											

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

另请参阅

number()

PySide2.QtCore.QByteArray. toLongLong ( [ base=10 ] ) ¶

参数: base – int
返回类型: qlonglong

Returns the byte array converted to a long long using base base , which is 10 by default and must be between 2 and 36, or 0.

返回 0，若转换失败。

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

另请参阅

number()

PySide2.QtCore.QByteArray. toLower ( ) ¶

返回类型: QByteArray

Returns a lowercase copy of the byte array. The bytearray is interpreted as a Latin-1 encoded string.

范例：

												x = QByteArray("Qt by THE QT COMPANY")
y = x.toLower()
# y == "qt by the qt company"
												
											

另请参阅

isLower() toUpper() 8 位字符比较

PySide2.QtCore.QByteArray. toPercentEncoding ( [ exclude=QByteArray() [ , include=QByteArray() [ , percent='%' ] ] ] ) ¶

参数

exclude – QByteArray
include – QByteArray
percent – char

返回类型

QByteArray

Returns a URI/URL-style percent-encoded copy of this byte array. The percent parameter allows you to override the default ‘%’ character for another.

By default, this function will encode all characters that are not one of the following:

ALPHA (“a” to “z” and “A” to “Z”) / DIGIT (0 to 9) / “-” / “.” / “_” / “~”

To prevent characters from being encoded pass them to exclude . To force characters to be encoded pass them to include 。 percent character is always encoded.

范例：

												QByteArray text = "{a fishy string?}";
QByteArray ba = text.toPercentEncoding("{}", "s");
qDebug(ba.constData());
// prints "{a fi%73hy %73tring%3F}"
												
											

The hex encoding uses the numbers 0-9 and the uppercase letters A-F.

另请参阅

fromPercentEncoding() toPercentEncoding()

PySide2.QtCore.QByteArray. toShort ( [ base=10 ] ) ¶

参数: base – int
返回类型: short

Returns the byte array converted to a short using base base , which is 10 by default and must be between 2 and 36, or 0.

返回 0，若转换失败。

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

另请参阅

number()

PySide2.QtCore.QByteArray. toUInt ( [ base=10 ] ) ¶

参数: base – int
返回类型: uint

Returns the byte array converted to an unsigned int using base base , which is 10 by default and must be between 2 and 36, or 0.

返回 0，若转换失败。

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

另请参阅

number()

PySide2.QtCore.QByteArray. toULong ( [ base=10 ] ) ¶

参数: base – int
返回类型: ulong

Returns the byte array converted to an unsigned long int using base base , which is 10 by default and must be between 2 and 36, or 0.

返回 0，若转换失败。

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

另请参阅

number()

PySide2.QtCore.QByteArray. toULongLong ( [ base=10 ] ) ¶

参数: base – int
返回类型: qulonglong

Returns the byte array converted to an unsigned long long using base base , which is 10 by default and must be between 2 and 36, or 0.

返回 0，若转换失败。

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

另请参阅

number()

PySide2.QtCore.QByteArray. toUShort ( [ base=10 ] ) ¶

参数: base – int
返回类型: ushort

Returns the byte array converted to an unsigned short using base base , which is 10 by default and must be between 2 and 36, or 0.

返回 0，若转换失败。

若 ok 不是 None , failure is reported by setting *``ok`` to false , and success by setting *``ok`` to true .

注意

The conversion of the number is performed in the default C locale, irrespective of the user’s locale.

另请参阅

number()

PySide2.QtCore.QByteArray. toUpper ( ) ¶

返回类型: QByteArray

Returns an uppercase copy of the byte array. The bytearray is interpreted as a Latin-1 encoded string.

范例：

												x = QByteArray("Qt by THE QT COMPANY")
y = x.toUpper()
# y == "QT BY THE QT COMPANY"
												
											

另请参阅

isUpper() toLower() 8 位字符比较

PySide2.QtCore.QByteArray. trimmed ( ) ¶

返回类型: QByteArray

Returns a byte array that has whitespace removed from the start and the end.

Whitespace means any character for which the standard C++ isspace() function returns true in the C locale. This includes the ASCII characters ‘\t’, ‘\n’, ‘\v’, ‘\f’, ‘\r’, and ‘ ‘.

范例：

												ba = QByteArray("  lots\t of\nwhitespace\r\n ");
ba = ba.trimmed();
# ba == "lots\t of\nwhitespace";
												
											

不像 simplified() , leaves internal whitespace alone.

另请参阅

simplified()

PySide2.QtCore.QByteArray. truncate ( pos ) ¶

参数: pos – int

Truncates the byte array at index position pos .

若 pos is beyond the end of the array, nothing happens.

范例：

												ba = QByteArray("Stockholm")
ba.truncate(5)             # ba == "Stock"

另请参阅

chop() resize() left()

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QByteArray ¶

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8 位字符比较 ¶