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RtlUlongByteSwap macro (wdm.h)

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The RtlUlongByteSwap routine reverses the ordering of the four bytes in a 32-bit unsigned integer value.

Syntax

NTSYSAPI ULONG RtlUlongByteSwap(
  [in] ULONG Source
);

Parameters

[in] Source

A ULONG value to convert to a byte-swapped version.

Return value

The byte-swapped version of the Source input parameter value.

Remarks

For example, if the Source parameter value is 0x12345678, the routine returns 0x78563412.

A typical use of this routine is to convert a ULONG value from little-endian byte format to big-endian byte format, and vice versa.

Use this routine instead of ntohl or htonl.

To reverse the ordering of bytes in a USHORT value, use the RtlUshortByteSwap routine. To reverse ordering of bytes in a ULONGLONG value, use the RtlUlonglongByteSwap routine.

Requirements

Requirement Value
Minimum supported client Available starting with Windows 2000.
Target Platform Universal
Header wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL Any level

See also

RtlUlonglongByteSwap

RtlUshortByteSwap