IVideoWindow::NotifyOwnerMessage method (control.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 NotifyOwnerMessage method forwards a message to the video window.

Syntax

HRESULT NotifyOwnerMessage(
  [in] OAHWND   hwnd,
  [in] long     uMsg,
  [in] LONG_PTR wParam,
  [in] LONG_PTR lParam
);

Parameters

[in] hwnd

A handle to the window, as an OAHWND value.

[in] uMsg

Specifies the message.

[in] wParam

Message parameter.

[in] lParam

Message parameter.

Return value

Possible return values include the following:

Return code	Description
S_OK	Success.
VFW_E_NOT_CONNECTED	The video renderer filter is not connected.

Remarks

The Filter Graph Manager calls this method to pass various messages to the renderer, including the following:

WM_ACTIVATEAPP
WM_DEVMODECHANGE
WM_DISPLAYCHANGE
WM_PALETTECHANGED
WM_PALETTEISCHANGING
WM_QUERYNEWPALETTE
WM_SYSCOLORCHANGE

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	control.h (include Dshow.h)
Library	Strmiids.lib