Re: _beginthreadex not compiling at all - what am I doing wrong?
Uwe Kotyczka wrote:
This is driving me mad, it seems impossible to give
_beginthreadex correct parameters. To reproduce the
problem I just created a new console project from scratch
an added this code:
unsigned __stdcall ThreadProc(LPVOID lpV)
{
static int aaa = *(int*)lpV;
for (int i = 0; i < 30; i++)
aaa += 2;
return 0;
}
int main(int argc, char* argv[])
{
int start = 102;
unsigned nId;
HANDLE hThread = _beginthreadex(NULL,
0,
ThreadProc,
&start,
0,
&nId);
WaitForSingleObject(hThread, INFINITE);
CloseHandle(hThread);
return 0;
}
I always get a C2440 error and have no idea why.
VC6 is complaining "cannot convert 'unsigned long' to 'void*'",
VS2003 is complaining "cannot convert from 'uintptr_t' to 'HANDLE'".
Using CreateThread instead of _beginthreadex (with slightly
different parameters) works fine.
Can anyone tell me what i am doing wrong?
It looks like the problem is with the function return type, not the
parameters.
_beginthreadex() returns an uintptr_t, and you are using a HANDLE.
The code sample in MSDN on _beginthreadex simply casts the returned
uintptr_t to HANDLE, like this:
HANDLE hThread = reinterpret_cast<HANDLE>( _beginthreadex(...) );
That should work
Timothy Madden
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