【转】DirectShow测试例程(VC6)

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分类专栏： DirectShow 文章标签：测试代码分析文档 null build file

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【转】DirectShow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 //// [注3]

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://DXSDK//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.

发表于： 2007-10-16 ，修改于： 2007-10-16 20:26