IAMVfwCaptureDialogs::ShowDialog method (strmif.h)

Article
02/22/2024

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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
E_INVALIDARG	Invalid argument.
S_OK	Success.
VFW_E_CANNOT_CONNECT	Could not reconnect with the new format.
VFW_E_NOT_STOPPED	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