QByteArrayMatcher 类

QByteArrayMatcher 类保持在字节数组中可以快速匹配的字节序列。更多...

头：	#include <QByteArrayMatcher>
CMake:	find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core)
qmake:	QT += core

所有成员列表，包括继承成员
QByteArrayMatcher is part of 用于字符串数据的类 .

公共函数

	QByteArrayMatcher ()
	QByteArrayMatcher (const QByteArray & pattern )
`(since 6.3)`	QByteArrayMatcher (QByteArrayView pattern )
	QByteArrayMatcher (const char * pattern , qsizetype length = -1)
	QByteArrayMatcher (const QByteArrayMatcher & other )
	~QByteArrayMatcher ()
qsizetype	indexIn (const char * str , qsizetype len , qsizetype from = 0) const
`(since 6.3)` qsizetype	indexIn (QByteArrayView data , qsizetype from = 0) const
QByteArray	pattern () const
void	setPattern (const QByteArray & pattern )
QByteArrayMatcher &	operator= (const QByteArrayMatcher & other )

详细描述

This class is useful when you have a sequence of bytes that you want to repeatedly match against some byte arrays (perhaps in a loop), or when you want to search for the same sequence of bytes multiple times in the same byte array. Using a matcher object and indexIn () is faster than matching a plain QByteArray with QByteArray::indexOf () if repeated matching takes place. This class offers no benefit if you are doing one-off byte array matches.

Create the QByteArrayMatcher with the QByteArray you want to search for. Then call indexIn () on the QByteArray that you want to search.

另请参阅 QByteArray and QStringMatcher .

成员函数文档编制

QByteArrayMatcher:: QByteArrayMatcher ()

Constructs an empty byte array matcher that won't match anything. Call setPattern () to give it a pattern to match.

`[explicit]` QByteArrayMatcher:: QByteArrayMatcher (const QByteArray & pattern )

Constructs a byte array matcher that will search for pattern 。调用 indexIn () to perform a search.

`[explicit, since 6.3]` QByteArrayMatcher:: QByteArrayMatcher ( QByteArrayView pattern )

这是重载函数。

Constructs a byte array matcher that will search for pattern 。调用 indexIn () to perform a search.

注意： the data that pattern is referencing must remain valid while this object is used.

该函数在 Qt 6.3 引入。

`[explicit]` QByteArrayMatcher:: QByteArrayMatcher (const char * pattern , qsizetype length = -1)

Constructs a byte array matcher from pattern . pattern has the given length 。调用 indexIn () to perform a search.

注意： the data that pattern is referencing must remain valid while this object is used.

QByteArrayMatcher:: QByteArrayMatcher (const QByteArrayMatcher & other )

拷贝 other byte array matcher to this byte array matcher.

`[noexcept]` QByteArrayMatcher:: ~QByteArrayMatcher ()

Destroys the byte array matcher.

qsizetype QByteArrayMatcher:: indexIn (const char * str , qsizetype len , qsizetype from = 0) const

Searches the char string str , which has length len , from byte position from (default 0, i.e. from the first byte), for the byte array pattern () that was set in the constructor or in the most recent call to setPattern (). Returns the position where the pattern () matched in str , or -1 if no match was found.

`[since 6.3]` qsizetype QByteArrayMatcher:: indexIn ( QByteArrayView data , qsizetype from = 0) const

这是重载函数。

Searches the byte array data , from byte position from (default 0, i.e. from the first byte), for the byte array pattern () that was set in the constructor or in the most recent call to setPattern (). Returns the position where the pattern () matched in data , or -1 if no match was found.

该函数在 Qt 6.3 引入。

QByteArray QByteArrayMatcher:: pattern () const

Returns the byte array pattern that this byte array matcher will search for.

另请参阅 setPattern ().

void QByteArrayMatcher:: setPattern (const QByteArray & pattern )

Sets the byte array that this byte array matcher will search for to pattern .

另请参阅 pattern () 和 indexIn ().

QByteArrayMatcher &QByteArrayMatcher:: operator= (const QByteArrayMatcher & other )

赋值 other byte array matcher to this byte array matcher.