CMsgThread::ThreadMessageProc

  • Article

Processes requests. This is a pure virtual member function.

virtual LRESULT ThreadMessageProc(
  UINT uMsg,
  DWORD dwFlags,
  LPVOID lpParam,
  CAMEvent* pEvent 
);

Parameters

  • uMsg
    Request code.
  • dwFlags
    Optional flag parameter to request.
  • lpParam
    Optional pointer to extra data or a return data block.
  • pEvent
    Optional pointer to an event object.

Return Values

Any nonzero return causes the thread to exit. Returns zero unless an exit request has been processed recently.

Remarks

This pure virtual function must be overridden in your derived class. It will be called once for each request queued by a call to the CMsgThread::PutThreadMsg member function.

The member function defines the four parameters. Typically, use the uMsg parameter to indicate the request, and the other three parameters will be optional additional parameters. The calling application can supply a pointer to a CAMEvent object in the pEvent parameter if your application requires it. You must set this event after processing the event by using an expression such as:

pEvent->SetEvent

One request code must be set aside to tell the worker thread to exit. Upon receiving this request, return 1 from this member function. Return 0 if you do not want the worker thread to exit.

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 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
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Last updated on Wednesday, April 13, 2005

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