一个简单的DirecxShow应用程序

最新推荐文章于 2020-11-27 12:15:35 发布

原创最新推荐文章于 2020-11-27 12:15:35 发布 · 796 阅读

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#null #graph #filter #application #manager #library

本文介绍了一款基于DirectShow的简易音频视频播放器程序。该程序仅由几行代码构成，却能展示DirectShow的强大功能。通过加载并播放指定路径下的媒体文件，演示了DirectShow在构建媒体播放应用方面的简便性和高效性。

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刚安装好Direct 9.0b，在VC6.0 下进行了配置。为了检验是否可以使用了，在网上找了一个简单的 DirectShow 应用程序。它是一个播放音频或视频文件的简单控制台程序，只有寥寥数行，但却展示了 DirectShow 编程的强大能力。源代码如下：

#include <dshow.h> #include <>stdio.h void main(void) { IGraphBuilder *pGraph = NULL; IMediaControl *pControl = NULL; IMediaEvent *pEvent = NULL; // Initialize the COM library. HRESULT hr = CoInitialize(NULL); if (FAILED(hr)) { printf("ERROR - Could not initialize COM library"); return; } // Create the filter graph manager and query for interfaces. 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); // Build the graph. IMPORTANT: Change this string to a file on your system. hr = pGraph->RenderFile(L"C://Example.avi", NULL); 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. } } pControl->Release(); pEvent->Release(); pGraph->Release(); CoUninitialize(); }