IAMVfwCompressDialogs::ShowDialog method (strmif.h)

Article
07/27/2023

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 dialog box.

Syntax

HRESULT ShowDialog(
  [in] int  iDialog,
  [in] HWND hwnd
);

Parameters

[in] iDialog

Dialog box to display. This is a member of the VfwCompressDialogs enumeration.

[in] hwnd

Handle of the dialog box's parent window.

Return value

Returns an HRESULT value that depends on the implementation of the interface.

Remarks

This method returns an error when asked to display a dialog box while the driver is streaming or displaying another dialog box. While the driver displays the dialog box you can't stream (pause or run) the filter.

IAMVfwCompressDialogs::ShowDialog calls the Video for Windows video compression manager (VCM) functions ICConfigure, ICAbout, ICQueryConfigure, and ICQueryAbout to display the appropriate dialog box or determine if one exists.

The VfwCompressDialog_QueryConfig and VfwCompressDialog_QueryAbout members of the VfwCompressDialogs enumeration tell you whether or not the configure dialog or about dialog is available. If passed one of these flags, the filter will return S_OK if the dialog exists, and S_FALSE if it does not. If a dialog is available, you call ShowDialog with the value VfwCompressDialog_Config or VfwCompressDialog_About to bring up the dialog.

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