DirectShow开发环境配置及测试例程(VC6)

开发环境
SDK：DirectX9.0b (Summer 2003)
Visual C++ 6.0

参考文档：SDK文档
1) DirectShow->Getting Started->Setting Up the Build Environment
2) DirectShow->DirectShow Reference->DirectShow Base Classes->Using the DirectShow Base Classes
3) DirectShow->Getting Started->How To Play a File

测试例子：SDK文档
DirectShow->Getting Started->How To Play a File

配置说明：
1. Tools->Options->Directories
Include - 添加<SDK root>/Include
Lib - 添加<SDK root>/Lib
- 添加<SDK root>/SAMPLES/C++/DirectShow/BASECLASSES/DEBUG // [注1]

2. Build BaseClasses
打开<SDK root>/Samples/C++/DirectShow/BaseClasses/baseclasses.dsp，编译debug得到Strmbasd.lib。 // [注2]

3. Project->Setting->Link
添加Strmbasd.lib

4. 添加头文件
#include <Dshow.h> // 所有DirectShow应用程序必备
#include <Streams.h> // 使用DirectShow基类

源代码如下，代码分析见参考文档3)


#include <Dshow.h>


#include <Streams.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);


hr = pGraph->RenderFile(L"E://DX90SDK//Samples//Media//chicken.wmv", NULL); // 打开一个媒体文件


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();


}



注1：该处可根据需要添加不同版本，如RELEASE/Debug_Unicode/Release_Unicode。
注2：debug - strmbasd.lib；release - strmbase.lib；另外还有对应的Unicode版本。
注3：步骤3缺，将导致
error LNK2001: unresolved external symbol _IID_IMediaEvent
error LNK2001: unresolved external symbol _IID_IMediaControl
error LNK2001: unresolved external symbol _CLSID_FilterGraph
error LNK2001: unresolved external symbol _IID_IGraphBuilder
Debug/Howtoplayafile.exe : fatal error LNK1120: 4 unresolved externals
Error executing link.exe.

*******************************************************************************

先编译BaseClasses,再在project->settings里面配置C/C++,下拉框选Preprocessor，确认有DEBUG，没有就加上，再配置Link，去掉"../../BASECLASSES/DEBUG_UNICODE/strmbasd.lib",换成你的BaseClasses所在目录，配置Tools->Options目录里面的Directory和Lib，分别加上“DXSDK/Include”,"Samples/c++/Directshow/baseclasses"和“Samples/c++/Directshow/baseclasses/debug”,“Samples/c++/Directshow/baseclasses/release”
"DXSDK/Lib"