如何在不使用directshow阻止事件的情况下播放视频 [英] How to play the video without blocking the events using directshow

问题描述

我试图播放包含播放，暂停和停止等一些基本控件的视频。如果我使用此代码

Am trying to play the video with some of the basic controls included like play, pause and stop. If i use this code

if (SUCCEEDED(hr))
  {
      // Run the graph.
      hr = pControl->Run();
      if (SUCCEEDED(hr))
      {
          // Wait for completion.
          long evCode;
          pEvent->WaitForCompletion(INFINITE, &evCode);

          // Note: Do not use INFINITE in a real application, because it
          // can block indefinitely.
      }
  }

它等待视频完成，所以我不能暂停播放视频。

所以我用（响应事件）

It waits for the video to complete so i cant pause the playing video.
so i used (responding to event)

#define WM_GRAPHNOTIFY  WM_APP + 1

IMediaEventEx *g_pEvent = NULL;
g_pGraph->QueryInterface(IID_IMediaEventEx, (void **)&g_pEvent);
g_pEvent->SetNotifyWindow((OAHWND)g_hwnd, WM_GRAPHNOTIFY, 0);

case WM_GRAPHNOTIFY:
    HandleGraphEvent();
    break;

void HandleGraphEvent()
{
    // Disregard if we don't have an IMediaEventEx pointer.
    if (g_pEvent == NULL)
    {
        return;
    }
    // Get all the events
    long evCode;
    LONG_PTR param1, param2;
    HRESULT hr;
    while (SUCCEEDED(g_pEvent->GetEvent(&evCode, ¶m1, ¶m2, 0)))
    {
        g_pEvent->FreeEventParams(evCode, param1, param2);
        switch (evCode)
        {
        case EC_COMPLETE:  // Fall through.
        case EC_USERABORT: // Fall through.
        case EC_ERRORABORT:
            CleanUp();
            PostQuitMessage(0);
            return;
        }
    } 
}

// Disable event notification before releasing the graph.
g_pEvent->SetNotifyWindow(NULL, 0, 0);
g_pEvent->Release();
g_pEvent = NULL;

我评论了waitforcompletion方法，它执行成功，但视频没有播放。



欢迎您提出建议。

I commented the waitforcompletion method, it executed sucessfully but the video was not played.

Your suggestions are welcome.

推荐答案

我上面给出的代码（回应事件）是现在效果很好。

The code which i given above (Responding to event) is works well now.

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