For Windows MSVC, where is the QWORD data type defined?-CodePudding

Getting an identifier "QWORD" is undefined error in this code

According to this doc, a QWORD is defined as

typedef unsigned __int64 QWORD;

As a workaround, I've manually added the definition

typedef uint64_t QWORD;

It seems odd these common data types BYTE, WORD and DWORD are defined, but the QWORD is not?

CodePudding user response：

I have found QWORD in winDNS.h as shown by this code, which compiles in the older 2015 32-bit MSVC and in the 2022 64-bit MSVC.

#include <stdio.h>
#include <windows.h>
#include <winDNS.h>

int main(void) {
    printf("%zu\n", sizeof(QWORD));
    return 0;
}

Program output:

The definition occurs in these (MSVC 2015) header files

Sspi.h
WinDNS.h
datacontainer.h
wmcodecdsp.h
wmnetsourcecreator.h
wmscontext.h
wmsdkidl.h
wmsincomingcounters.h
wmspacket.h