The DescribePixelFormat function obtains pixel format data for a device context. It also returns an integer that is the maximum pixel format index for the device context. The following code sample shows how to use that result to step through and examine the pixel formats supported by a device:
// local variables
int iMax ;
PIXELFORMATDESCRIPTOR pfd;
int iPixelFormat ;
// initialize a pixel format index variable
iPixelFormat = 1;
// keep obtaining and examining pixel format data...
do {
// try to obtain some pixel format data
iMax = DescribePixelFormat(hdc, iPixelFormat, sizeof(pfd), &pfd);
// if there was some problem with that...
if (iMax == 0)
// return indicating failure
return(FALSE);
// we have successfully obtained pixel format data
// let's examine the pixel format data...
myPixelFormatExaminer (&pfd);
}
// ...until we've looked at all the device context's pixel formats
while (++iPixelFormat <= iMax);