<QtEndian> - Endian Conversion Functions

The <QtEndian> header provides functions to convert between little and big endian representations of numbers. 更多...

Types

函数

类型文档编制

typedef qint16_be

Typedef 为 QBEInteger <qint16>. This type is guaranteed to be stored in memory as a 16-bit big-endian signed integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 qint16 .

typedef qint16_le

Typedef 为 QLEInteger <qint16>. This type is guaranteed to be stored in memory as a 16-bit little-endian signed integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 qint16 .

typedef qint32_be

Typedef 为 QBEInteger <qint32>. This type is guaranteed to be stored in memory as a 32-bit big-endian signed integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 qint32 .

typedef qint32_le

Typedef 为 QLEInteger <qint32>. This type is guaranteed to be stored in memory as a 32-bit little-endian signed integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 qint32 .

typedef qint64_be

Typedef 为 QBEInteger <qint64>. This type is guaranteed to be stored in memory as a 64-bit big-endian signed integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 qint64 .

typedef qint64_le

Typedef 为 QLEInteger <qint64>. This type is guaranteed to be stored in memory as a 64-bit little-endian signed integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 qint64 .

typedef quint16_be

Typedef 为 QBEInteger <quint16>. This type is guaranteed to be stored in memory as a 16-bit big-endian unsigned integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 quint16 .

typedef quint16_le

Typedef 为 QLEInteger <quint16>. This type is guaranteed to be stored in memory as a 16-bit little-endian unsigned integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 quint16 .

typedef quint32_be

Typedef 为 QBEInteger <quint32>. This type is guaranteed to be stored in memory as a 32-bit big-endian unsigned integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 quint32 .

typedef quint32_le

Typedef 为 QLEInteger <quint32>. This type is guaranteed to be stored in memory as a 32-bit little-endian unsigned integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 quint32 .

typedef quint64_be

Typedef 为 QBEInteger <quint64>. This type is guaranteed to be stored in memory as a 64-bit big-endian unsigned integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 quint64 .

typedef quint64_le

Typedef 为 QLEInteger <quint64>. This type is guaranteed to be stored in memory as a 64-bit little-endian unsigned integer on all platforms supported by Qt.

This typedef was introduced in Qt 5.10.

另请参阅 quint64 .

函数文档编制

T qFromBigEndian ( T src )

这是重载函数。

转换 src from big-endian byte order and returns the number in host byte order representation of that number. On CPU architectures where the host byte order is little-endian (such as x86) this will return src with the byte order swapped; otherwise it will return src unmodified.

This function was introduced in Qt 4.3.

T qFromBigEndian (const void * src )

Reads a big-endian number from memory location src and returns the number in the host byte order representation. On CPU architectures where the host byte order is little-endian (such as x86) this will swap the byte order; otherwise it will just read from src .

注意： Template type T can either be a quint16, qint16, quint32, qint32, quint64, or qint64. Other types of integers, e.g., qlong, are not applicable.

注意： Since Qt 5.7, the type of the src parameter is a void pointer.

There are no data alignment constraints for src .

This function was introduced in Qt 4.3.

另请参阅 qFromLittleEndian (), qToBigEndian ()，和 qToLittleEndian ().

void qFromBigEndian (const void * src , qsizetype count , void * dest )

Reads count big-endian numbers from memory location src and stores them in the host byte order representation at dest . On CPU architectures where the host byte order is little-endian (such as x86) this will swap the byte order; otherwise it will just perform a memcpy from src to dest .

注意： Template type T can either be a quint16, qint16, quint32, qint32, quint64, or qint64. Other types of integers, e.g., qlong, are not applicable.

There are no data alignment constraints for src . However, dest is expected to be naturally aligned for type T .

若 src and dest can be the same pointer, this function will perform an in-place swap (if necessary). If they are not the same, the memory regions must not overlap.

This function was introduced in Qt 5.12.

另请参阅 qFromLittleEndian (), qToBigEndian ()，和 qToLittleEndian ().

T qFromLittleEndian ( T src )

这是重载函数。

转换 src from little-endian byte order and returns the number in host byte order representation of that number. On CPU architectures where the host byte order is big-endian (such as PowerPC) this will return src with the byte order swapped; otherwise it will return src unmodified.

This function was introduced in Qt 4.3.

T qFromLittleEndian (const void * src )

Reads a little-endian number from memory location src and returns the number in the host byte order representation. On CPU architectures where the host byte order is big-endian (such as PowerPC) this will swap the byte order; otherwise it will just read from src .

注意： Template type T can either be a quint16, qint16, quint32, qint32, quint64, or qint64. Other types of integers, e.g., qlong, are not applicable.

注意： Since Qt 5.7, the type of the src parameter is a void pointer.

There are no data alignment constraints for src .

This function was introduced in Qt 4.3.

另请参阅 qFromBigEndian (), qToBigEndian ()，和 qToLittleEndian ().

void qFromLittleEndian (const void * src , qsizetype count , void * dest )

Reads count little-endian numbers from memory location src and stores them in the host byte order representation at dest . On CPU architectures where the host byte order is big-endian (such as PowerPC) this will swap the byte order; otherwise it will just perform a memcpy from src to dest .

注意： Template type T can either be a quint16, qint16, quint32, qint32, quint64, or qint64. Other types of integers, e.g., qlong, are not applicable.

There are no data alignment constraints for src . However, dest is expected to be naturally aligned for type T .

若 src and dest can be the same pointer, this function will perform an in-place swap (if necessary). If they are not the same, the memory regions must not overlap.

This function was introduced in Qt 5.12.

另请参阅 qFromLittleEndian (), qToBigEndian ()，和 qToLittleEndian ().

T qToBigEndian ( T src )

这是重载函数。

转换 src from host byte order and returns the number in big-endian byte order representation of that number. On CPU architectures where the host byte order is little-endian (such as x86) this will return src with the byte order swapped; otherwise it will return src unmodified.

This function was introduced in Qt 4.3.

void qToBigEndian ( T src , void * dest )

Writes the number src with template type T to the memory location at dest in big-endian byte order.

注意： Template type T can either be a quint16, qint16, quint32, qint32, quint64, or qint64. Other types of integers, e.g., qlong, are not applicable.

There are no data alignment constraints for dest .

注意： Since Qt 5.7, the type of the dest parameter is a void pointer.

This function was introduced in Qt 4.3.

另请参阅 qFromBigEndian (), qFromLittleEndian ()，和 qToLittleEndian ().

void qToBigEndian (const void * src , qsizetype count , void * dest )

Reads count numbers from memory location src in the host byte order and stores them in big-endian representation at dest . On CPU architectures where the host byte order is little-endian (such as x86) this will swap the byte order; otherwise it will just perform a memcpy from src to dest .

注意： Template type T can either be a quint16, qint16, quint32, qint32, quint64, or qint64. Other types of integers, e.g., qlong, are not applicable.

There are no data alignment constraints for dest . However, src is expected to be naturally aligned for type T .

若 src and dest can be the same pointer, this function will perform an in-place swap (if necessary). If they are not the same, the memory regions must not overlap.

This function was introduced in Qt 5.12.

另请参阅 qFromLittleEndian (), qToBigEndian ()，和 qToLittleEndian ().

T qToLittleEndian ( T src )

这是重载函数。

转换 src from host byte order and returns the number in little-endian byte order representation of that number. On CPU architectures where the host byte order is big-endian (such as PowerPC) this will return src with the byte order swapped; otherwise it will return src unmodified.

This function was introduced in Qt 4.3.

void qToLittleEndian ( T src , void * dest )

Writes the number src with template type T to the memory location at dest in little-endian byte order.

注意： Template type T can either be a quint16, qint16, quint32, qint32, quint64, or qint64. Other types of integers, e.g., qlong, are not applicable.

There are no data alignment constraints for dest .

注意： Since Qt 5.7, the type of the dest parameter is a void pointer.

This function was introduced in Qt 4.3.

另请参阅 qFromBigEndian (), qFromLittleEndian ()，和 qToBigEndian ().

void qToLittleEndian (const void * src , qsizetype count , void * dest )

Reads count numbers from memory location src in the host byte order and stores them in little-endian representation at dest . On CPU architectures where the host byte order is big-endian (such as PowerPC) this will swap the byte order; otherwise it will just perform a memcpy from src to dest .

注意： Template type T can either be a quint16, qint16, quint32, qint32, quint64, or qint64. Other types of integers, e.g., qlong, are not applicable.

There are no data alignment constraints for dest . However, src is expected to be naturally aligned for type T .

若 src and dest can be the same pointer, this function will perform an in-place swap (if necessary). If they are not the same, the memory regions must not overlap.

This function was introduced in Qt 5.12.

另请参阅 qFromLittleEndian (), qToBigEndian ()，和 qToLittleEndian ().