Splayer CGraphThread 分析

最新推荐文章于 2025-04-09 09:21:57 发布

iteye_4476

最新推荐文章于 2025-04-09 09:21:57 发布

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本文详细介绍了主程序如何通过CGraphThread类管理多媒体事件，包括创建、打开、关闭媒体资源的过程。特别关注了线程消息传递机制，如TM_OPEN和TM_CLOSE，以及线程终止时的安全处理。

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主程序对CGraphThread 分析以及事件分析

建立在MainFrm.cpp OnCreate中

m_pGraphThread = (CGraphThread*)AfxBeginThread(RUNTIME_CLASS(CGraphThread));

if(m_pGraphThread)
m_pGraphThread->SetMainFrame(this);

主程序销毁时调用
if(m_pGraphThread)
{
CAMEvent e;
m_pGraphThread->PostThreadMessage(CGraphThread::TM_EXIT, 0, (LPARAM)&e);
if(!e.Wait(5000))
{
TRACE(_T("ERROR: Must call TerminateThread() on CMainFrame::m_pGraphThread->m_hThread\n"));
TerminateThread(m_pGraphThread->m_hThread, -1);
}
}

使用在OpenMedia 事件中调用
if(m_pGraphThread && fUseThread
&& AfxGetAppSettings().fEnableWorkerThreadForOpening)
m_pGraphThread->PostThreadMessage(CGraphThread::TM_OPEN, 0, (LPARAM)pOMD.Detach());
else
OpenMediaPrivate(pOMD);

使用在CloseMedia事件中调用
if(m_pGraphThread )
{

CAMEvent e;
m_pGraphThread->PostThreadMessage(CGraphThread::TM_CLOSE, 0, (LPARAM)&e);
// either opening or closing has to be blocked to prevent reentering them, closing is the better choice
if(!e.Wait(5000))
{
TRACE(_T("ERROR: Must call TerminateThread() on CMainFrame::m_pGraphThread->m_hThread\n"));
TerminateThread(m_pGraphThread->m_hThread, -1);
m_pGraphThread = (CGraphThread*)AfxBeginThread(RUNTIME_CLASS(CGraphThread));
if(m_pGraphThread)
m_pGraphThread->SetMainFrame(this);

}
}