ICOpenFunction function

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


HIC VFWAPI 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 Value

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


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header vfw.h
Library Vfw32.lib
DLL Msvfw32.dll

See Also

Video Compression Functions

Video Compression Manager