A simple DirectShow example

#include <dshow.h>
#include "stdio.h"
#pragma comment(lib,"strmiids.lib")
void main(void)
...{
    IGraphBuilder *pGraph = NULL;
    IMediaControl *pControl = NULL;
    IMediaEvent   *pEvent = NULL;
    // 初始化COM库
    HRESULT hr = CoInitialize(NULL);
    if (FAILED(hr))
    ...{
        printf("ERROR - Could not initialize COM library");
        return;
    }
    // 创建筛选器表管理器，并查询接口
    hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, 
        IID_IGraphBuilder, (void **)&pGraph);
    if (FAILED(hr))
    ...{
        printf("ERROR - Could not create the Filter Graph Manager.");
        return;
    }
    hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
    hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
    // 创建表。
    hr = pGraph->RenderFile(L"C:/aa.mp3", NULL);
    if (SUCCEEDED(hr))
    ...{
        // 运行表
        hr = pControl->Run();
        if (SUCCEEDED(hr))
        ...{
            //　等待结束
            long evCode;
            pEvent->WaitForCompletion(INFINITE, &evCode);
            // 注意：在实际应用程序中不要使用INFINITE
            // 因为它对应用程序的阻塞很不确定
        }
    }
    pControl->Release();
    pEvent->Release();
    pGraph->Release();
    CoUninitialize();
}