GetDIBits function returns 0

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C++

Hi,

I am developing an image capture application,I am trying to fetch BITMAPINFO using GetDIBits call,before sending the BITMAPINFO structure address to the function I am memset ing the structure memory to zero.
If lpvbits parameter of the GetDIBits is 0 then I suppose it should fill in the BITMAPINFO structure and return,but the function returns 0.
this is how the code looks:

ZeroMemory(&infobm.bmiHeader,sizeof(BITMAPINFOHEADER));
                    infobm.bmiHeader.biBitCount = 24;
                    infobm.bmiHeader.biSize = sizeof(infobm);
                    infobm.bmiHeader.biHeight = 0;
                    infobm.bmiHeader.biWidth = 0;
                    infobm.bmiHeader.biPlanes = 1;
                    r = GetDIBits(dc,hbitmapHandle,0,infobm.bmiHeader.biHeight,0,&infobm,DIB_RGB_COLORS);
                    if(r == 0){
                        AfxMessageBox("Error Processing bitmap1");
                        return 1;
                    }

Please help,
thanks in advance