The ICOpenFunction function opens a compressor or decompressor defined as a function.

HIC ICOpenFunction(
  DWORD fccType,       
  DWORD fccHandler,    
  UINT wMode,          
  FARPROC lpfnHandler  



Type of compressor to open. For video, the value of this parameter is ICTYPE_VIDEO.


Preferred handler of the specified type. Typically, this comes from the stream header in an AVI file.


Flag to define the use of the compressor or decompressor. The following values are defined.

Value Meaning
ICMODE_COMPRESS Compressor will perform normal compression.
ICMODE_DECOMPRESS Decompressor will perform normal decompression.
ICMODE_DRAW Decompressor will decompress and draw the data directly to hardware.
ICMODE_FASTCOMPRESS Compressor will perform fast (real-time) compression.
ICMODE_FASTDECOMPRESS Decompressor will perform fast (real-time) decompression.
ICMODE_QUERY Queries the compressor or decompressor for information.


Pointer to the function used as the compressor or decompressor.

Return Values

Returns a handle to a compressor or decompressor if successful or zero otherwise.


  Windows NT/2000/XP: Included in Windows NT 3.1 and later.
  Windows 95/98/Me: Included in Windows 95 and later.
  Header: Declared in Vfw.h.
  Library: Use Vfw32.lib.

See Also

Video Compression Manager, Video Compression Functions