ICCompressorChoose function (vfw.h)
The ICCompressorChoose function displays a dialog box in which a user can select a compressor. This function can display all registered compressors or list only the compressors that support a specific format.
Syntax
BOOL VFWAPI ICCompressorChoose(
HWND hwnd,
UINT uiFlags,
LPVOID pvIn,
LPVOID lpData,
PCOMPVARS pc,
LPSTR lpszTitle
);
Parameters
hwnd
Handle to a parent window for the dialog box.
uiFlags
Applicable flags. The following values are defined.
| Value | Meaning |
|---|---|
| ICMF_CHOOSE_ALLCOMPRESSORS | All compressors should appear in the selection list. If this flag is not specified, only the compressors that can handle the input format appear in the selection list. |
| ICMF_CHOOSE_DATARATE | Displays a check box and edit box to enter the data rate for the movie. |
| ICMF_CHOOSE_KEYFRAME | Displays a check box and edit box to enter the frequency of key frames. |
| ICMF_CHOOSE_PREVIEW | Displays a button to expand the dialog box to include a preview window. The preview window shows how frames of your movie will appear when compressed with the current settings. |
pvIn
Uncompressed data input format. Only compressors that support the specified data input format are included in the compressor list. This parameter is optional.
lpData
Pointer to an AVI stream interface to use in the preview window. You must specify a video stream. This parameter is optional.
pc
Pointer to a COMPVARS structure. The information returned initializes the structure for use with other functions.
lpszTitle
Pointer to a null-terminated string containing a title for the dialog box. This parameter is optional.
Return value
Returns TRUE if the user chooses a compressor and presses OK. Returns FALSE on error or if the user presses CANCEL.
Remarks
Before using this function, set the cbSize member of the COMPVARS structure to the size of the structure. Initialize the rest of the structure to zeros unless you want to specify some valid defaults for the dialog box. If specifying defaults, set the dwFlags member to ICMF_COMPVARS_VALID and initialize the other members of the structure. For more information about initializing the structure, see the ICSeqCompressFrameStart function and COMPVARS.
Requirements
| Requirement | Value |
|---|---|
| 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 |