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IVideoWindow::get_MessageDrain method (control.h)

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[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 get_MessageDrain method retrieves the window that receives mouse and keyboard messages from the video window, if any.

Syntax

HRESULT get_MessageDrain(
  [in] OAHWND *Drain
);

Parameters

[in] Drain

Receives a handle to the window, as an OAHWND type. If no message drain was set, this parameter receives the value NULL.

Return value

Possible return values include the following:

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

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

See also

Error and Success Codes

IVideoWindow Interface

IVideoWindow::put_MessageDrain