DirectShow开发环境配置及测试例程(VC6)

夜舞重金属 — Tue, 17 Oct 2006 09:49:00 GMT

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\Include
Lib       - 添加\Lib
            - 添加\SAMPLES\C++\DirectShow\BASECLASSES\DEBUG // [注1]

2. Build BaseClasses
打开\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         // 所有DirectShow应用程序必备
#include       // 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.

夜舞重金属 2006-10-17 17:49 发表评论

C++博客-阅读＋实践＝成长-随笔分类-DirectShow

DirectShow开发环境配置及测试例程(VC6)