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CBaseControlWindow::NotifyOwnerMessage

  • Article

Passes along specific messages to the video window.

HRESULT NotifyOwnerMessage(
  long hwnd,
  long uMsg,
  long wParam,
  long lParam
);

Parameters

  • hwnd
    Handle to the video window.
  • uMsg
    Message details.
  • wParam
    Standard WPARAM parameter.
  • lParam
    Standard LPARAM parameter.

Return Values

Returns NO_ERROR.

Remarks

When the video window is a child of another window, it does not receive certain top-level window messages. These messages can be valuable to a renderer, because they could affect its behavior. NotifyOwnerMessage passes any of the following messages to the video window:

  • WM_ACTIVATEAPP
  • WM_DEVMODECHANGE
  • WM_DISPLAYCHANGE
  • WM_PALETTECHANGED
  • WM_PALETTEISCHANGING
  • WM_QUERYNEWPALETTE
  • WM_SYSCOLORCHANGE

You can request that the IVideoWindow plug-in distributor (PID) make a window become a child of another window. When this occurs, the PID will look for certain messages that might be sent to the owning window. The PID will then forward those messages to the owned window. The default processing for the messages is to send them to the owned window procedure synchronously by calling the Win32 SendMessage function.

Requirements

DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 3.0 and later.
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Last updated on Wednesday, April 13, 2005

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