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Determining a Compressor's Output Format
The following example uses the ICCompressGetFormat size macro to determine the buffer size needed for the data specifying the
compression format, allocates a buffer of the appropriate size using the GlobalAlloc function, and retrieves the compression format information using the ICCompressGetFormat macro.
LPBITMAPINFOHEADER lpbiIn, lpbiOut;
// *lpbiIn must be initialized to the input format.
dwFormatSize = ICCompressGetFormatSize(hIC, lpbiIn);
h = GlobalAlloc(GHND, dwFormatSize);
lpbiOut = (LPBITMAPINFOHEADER)GlobalLock(h);
ICCompressGetFormat(hIC, lpbiIn, lpbiOut);
The following example uses the ICCompressQuery macro to determine whether a compressor can handle the input and output
formats.
LPBITMAPINFOHEADER lpbiIn, lpbiOut;
// Both *lpbiIn and *lpbiOut must be initialized to the respective
// formats.
if (ICCompressQuery(hIC, lpbiIn, lpbiOut) == ICERR_OK)
{
// Format is supported; use the compressor.
}
The following example uses the ICCompressGetSize macro to determine the buffer size, and it allocates a buffer of that size
using GlobalAlloc.
// Find the worst-case buffer size.
dwCompressBufferSize = ICCompressGetSize(hIC, lpbiIn, lpbiOut);
// Allocate a buffer and get lpOutput to point to it.
h = GlobalAlloc(GHND, dwCompressBufferSize);
lpOutput = (LPVOID)GlobalLock(h);
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