第一个DirectShow程序

iteye_4476

于 2008-06-24 17:28:00 发布

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本文展示了一个使用DirectShow API创建简单媒体播放器的过程。该示例代码通过COM组件初始化DirectShow过滤图，并渲染多媒体文件。文章详细介绍了从初始化COM库到释放资源的整个流程，包括错误处理和等待事件完成等步骤。

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 1: 
 4: #include 
 5: 
 6: 
 7: #include dshowh
 8:  
 9: 
10: 	IGraphBuilder pGraph  NULL
11: 	IMediaControl pControl  NULL
12: 	IMediaEvent   pEvent  NULL
13: 
14: 		HRESULT hr  CoInitializeNULL
16: 	 FAILEDhr
17: 	
18: 		printf
19: 		
20: 	
21: 
22: 		hr  CoCreateInstanceCLSID_FilterGraph NULL CLSCTX_INPROC_SERVER 
24: 		IID_IGraphBuilder  pGraph
25: 	 FAILEDhr
26: 	
27: 		printf
28: 		
29: 	
30: 
31: 	hr  pGraphQueryInterfaceIID_IMediaControl  pControl
32: 	hr  pGraphQueryInterfaceIID_IMediaEvent  pEvent
33: 
34: 		hr  pGraphRenderFileL NULL
36: 	 SUCCEEDEDhr
37: 	
38: 				hr  pControlRun
40: 		 SUCCEEDEDhr
41: 		
42: 						 evCode
44: 			pEventWaitForCompletionINFINITE evCode
45: 
46: 								
49: 	
50: 	pControlRelease
51: 	pEventRelease
52: 	pGraphRelease
53: 	CoUninitialize
54: