mfc, qsort error message

microsoft.public.vc.mfc - Microsoft Visual C


mfc >> qsort error message

by eric57e » Mon, 24 Nov 2003 20:28:01 GMT

I have tried to use qsort to sort a long array in a MFC program.
I have the followinf message
error C2664: 'qsort' : cannot convert parameter 4 from 'int (const
void *,const void *)' to 'int (__cdecl *)(const void *,const void *)

here is my code

void CQuickSortTestDlg::OnBnSort()
{
long vArray[]={9,6,7,6,3,2,1,8,0,4,5,4};
qsort((void*) vArray,(size_t) 12, sizeof(long), compare);
CString str,Msg;
for (int i=0 ; i < 12;i++)
{
str.Format("%d ",vArray[i]);
Msg+=str;
}
MessageBox(Msg);

}

int CQuickSortTestDlg::compare(const void *el1,const void *el2)
{
int res=*((long*)el1) - *((long*)el2);
return res;
}

I have read some documentation about decorated function names.
Should I use such a notation here?

It would be very nice If someone could tell me what is wrong in my
code.

Eric

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mfc >> qsort error message

by Scott McPhillips [MVP] » Mon, 24 Nov 2003 21:27:18 GMT





qsort is a C compatible function and can not use a C++ member function
as the callback - C++ function signatures differ. Change your compare
function declaration to be a static class member, or not a member of a
class.

--
Scott McPhillips [VC++ MVP]



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mfc >> qsort error message

by Joseph M. Newcomer » Tue, 25 Nov 2003 09:37:33 GMT

Is compare declared as a static method?
joe




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