IAMVfwCaptureDialogs::ShowDialog method (strmif.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The ShowDialog method displays the specified VFW dialog box.
Syntax
HRESULT ShowDialog(
[in] int iDialog,
[in] HWND hwnd
);
Parameters
[in] iDialog
Dialog box to display. This is a member of the VfwCaptureDialogs enumeration.
[in] hwnd
Handle of the dialog box's parent window.
Return value
Returns an HRESULT value. Possible values include the following.
| Return code | Description |
|---|---|
|
Invalid argument. |
|
Success. |
|
Could not reconnect with the new format. |
|
The filter graph is not stopped. |
Remarks
Stop the filter graph before calling this method. Otherwise, the method fails and returns VFW_E_NOT_STOPPED.
The Video Format dialog (VfwCaptureDialog_Format) may change the video format. If so, the method tries to reconnect the capture filter. If the downstream filter rejects the new format, the method returns VFW_E_CANNOT_CONNECT.
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 | strmif.h (include Dshow.h) |
| Library | Strmiids.lib |