VC学习笔记6音频处理

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音频处理
首先在资源视图右击导入音频资源,记下ID为IDR_BWAVE
在视图类的源文件中需要导入库，该库为windows多媒体操作的接口
#include"Mmsystem.h"
#pragma comment (lib,"Winmm.lib")
然后在所需要播放音频的响应函数中加入
PlaySound(MAKEINTRESOURCE(IDR_BWAVE),AfxGetResourceHandle(),
SND_ASYNC|SND_RESOURCE|SND_NODEFAULT);
就能实现播放音频
当然，如果你想播放任意文件名为参数的音频，可以调用这个类

class CPlayWave{protected:    MCIDEVICEID m_DeviceID;  //设备ID    MCIDEVICEID m_ElementID;  //元素IDpublic:    CPlayWave()    {        m_DeviceID=0;        m_ElementID=0;        InitDevice();    }    ~CPlayWave()    {        if(m_ElementID)            Stop();        if(m_DeviceID)            TerminalDevice();    }    DWORD InitDevice()  //初始化设备    {        DWORD dwResult=0;        if(m_DeviceID==0)        {            MCI_OPEN_PARMS mciInitParms;            mciInitParms.lpstrDeviceType=(LPSTR)MCI_DEVTYPE_WAVEFORM_AUDIO;            dwResult=mciSendCommand(NULL,MCI_OPEN,MCI_OPEN_TYPE|MCI_OPEN_TYPE_ID|MCI_WAIT,(DWORD)(LPVOID)&mciInitParms);            m_DeviceID=mciInitParms.wDeviceID;        }        return dwResult;    }    DWORD TerminalDevice()    {        DWORD dwResult=0;        if(m_DeviceID)        {            dwResult=mciSendCommand(m_DeviceID,MCI_CLOSE,NULL,NULL);        }        m_DeviceID=0;        return dwResult;    }    DWORD Play(HWND hWnd,LPCSTR pFileName)    {        MCI_OPEN_PARMS mciOpenParms;        memset(&mciOpenParms,0,sizeof(MCI_OPEN_PARMS));        mciOpenParms.lpstrElementName=pFileName;        DWORD dwResult=0;        dwResult=mciSendCommand(m_DeviceID,MCI_OPEN,MCI_OPEN_ELEMENT,(DWORD)(LPVOID)&mciOpenParms);        if(!dwResult)        {            m_ElementID=mciOpenParms.wDeviceID;            MCI_PLAY_PARMS mciPlayParms;            mciPlayParms.dwCallback=(DWORD)hWnd;            dwResult=mciSendCommand(m_ElementID,MCI_PLAY,MCI_NOTIFY,(DWORD)(LPVOID)&mciPlayParms);        }        return dwResult;    }    DWORD Stop()    {        DWORD dwResult=0;        if(m_ElementID)        {            dwResult=mciSendCommand(m_ElementID,MCI_CLOSE,NULL,NULL);            m_ElementID=0;        }        return dwResult;    }};

注意了这里的调入参数为m_hWnd ，每个程序都会自动生成变量m_hWnd

对wav文件格式的解析可以参考

http://blog.csdn.net/pi9nc/article/details/12570841

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