Windows mobile5.0上的mp3播放器只能播放wav格式的···

#pragma once#include <streams.h>#pragma comment (lib,"Ole32.lib")#pragma comment (lib,"Strmiids.lib")#define HELPER_RELEASE(x) { if (x) x->Release(); x = NULL; }#define WM_GRAPHNOTIFY  WM_USER+1class CPlayControl{public:    CPlayControl(void);public:    ~CPlayControl(void);public:    IGraphBuilder *pGB;        //这是directshow的核心    IMediaControl *pMC;        //帮我们连接filter(媒体文件,解码器等)              //简单的说,它帮我们简单地打开和播放文件.    IMediaEventEx *pME;        //处理过滤器图表的事件    IVideoWindow  *pVW;        //用这个来控制directshow的视频窗口    IBasicAudio   *pBA;        //用于控制音频流的音量和平衡    IBasicVideo   *pBV;     //用于设置视频特性，如视频显示的目的区域和源区域    IMediaSeeking *pMS;        //提供搜索数据流位置和设置播放速率的方法,播放位置    enum PLAYSTATE { RUNING, PAUSED, STOPPED, INIT };public:    PLAYSTATE playControlInfo;    HWND      ghApp;public:    bool SetNotifyWindow(HWND inWindow);    bool Create();    bool RenderFile(WCHAR *szFile);    bool buttonPlay();    bool buttonPause();    void buttonStop();    void CloseInterfaces(void);    bool ListPlay(WCHAR *szFile);    float GetAlltime();    float GetCurrentPosition();    bool SetCurrentPosition(double inPosition) ;    bool Running();    void SetVol(int m_vol);    IMediaEventEx * GetEventHandle();};

#include "StdAfx.h"#include "PlayControl.h"CPlayControl::CPlayControl(void){    IGraphBuilder *pGB = NULL;    IMediaControl *pMC = NULL;    IMediaEventEx *pME = NULL;    IVideoWindow  *pVW = NULL;    IBasicAudio   *pBA = NULL;    IBasicVideo   *pBV = NULL;    IMediaSeeking *pMS = NULL;    playControlInfo = STOPPED;    ghApp = 0;}CPlayControl::~CPlayControl(void){    CoUninitialize();}void CPlayControl::CloseInterfaces(void){    HELPER_RELEASE(pMC);    HELPER_RELEASE(pME);    HELPER_RELEASE(pMS);    HELPER_RELEASE(pBV);    HELPER_RELEASE(pBA);    HELPER_RELEASE(pVW);    HELPER_RELEASE(pGB);    // No current media state    playControlInfo = INIT;}bool CPlayControl::Create(){    if(FAILED(CoInitialize(NULL)))        return false;    // Get the interface for DirectShow's GraphBuilder    if( SUCCEEDED( CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGB )))    {        HRESULT hr = NOERROR;        // QueryInterface for DirectShow interfaces        hr |= (pGB->QueryInterface(IID_IMediaControl, (void **)&pMC));        hr |= (pGB->QueryInterface(IID_IMediaEventEx, (void **)&pME));        hr |= (pGB->QueryInterface(IID_IMediaSeeking, (void **)&pMS));        // Query for video interfaces, which may not be relevant for audio files        hr |= (pGB->QueryInterface(IID_IVideoWindow, (void **)&pVW));        hr |= (pGB->QueryInterface(IID_IBasicVideo, (void **)&pBV));        // Query for audio interfaces, which may not be relevant for video-only files        hr |= (pGB->QueryInterface(IID_IBasicAudio, (void **)&pBA));        return true;    }    return false;}bool CPlayControl::RenderFile(WCHAR *szFile){            if ( pGB && SUCCEEDED( pGB->RenderFile(szFile, NULL)))    {        return true;    }    else        return false ;}bool CPlayControl::SetNotifyWindow(HWND inWindow){    if (pME)    {        pME->SetNotifyWindow((OAHWND)inWindow, WM_GRAPHNOTIFY, 0);        return true;    }    return false;}bool CPlayControl::Running(){    if(playControlInfo == RUNING || playControlInfo == PAUSED)        return true;    else        return false;}bool CPlayControl::ListPlay(WCHAR *szFile){    if(pME)    {        pME->SetNotifyWindow(NULL,0,0);        CloseInterfaces();    }    if(playControlInfo == RUNING || playControlInfo == PAUSED)    {                playControlInfo = STOPPED;    }    if(Create() && RenderFile(szFile))    {        pMC->Run();        playControlInfo = RUNING ;        return true;    }    return false;}bool CPlayControl::buttonPlay(){    if(playControlInfo == RUNING)        return FALSE;    else    {        pMC->Run();        playControlInfo = RUNING;        return TRUE;    }}bool CPlayControl::buttonPause(){    if(playControlInfo == RUNING)    {        pMC->Pause();        playControlInfo = PAUSED;        return TRUE;    }    else        return FALSE;}void CPlayControl::buttonStop(){    if((playControlInfo == PAUSED) || (playControlInfo == RUNING))    {        pMC->Stop();    }        playControlInfo = STOPPED;    pME->SetNotifyWindow(NULL,0,0);    CloseInterfaces();}IMediaEventEx * CPlayControl::GetEventHandle(){    return pME;}bool CPlayControl::SetCurrentPosition(double inPosition){    if (pMS)    {        __int64 one = 10000000;        __int64 position = (__int64)(one * inPosition);        HRESULT hr = pMS->SetPositions(&position, AM_SEEKING_AbsolutePositioning | AM_SEEKING_SeekToKeyFrame,             0, AM_SEEKING_NoPositioning);        return SUCCEEDED(hr);    }    return false;}void CPlayControl::SetVol(int m_vol){    pBA->put_Balance(0);    pBA->put_Volume( -m_vol * 100);}float CPlayControl::GetAlltime(){    float time ;    if(pMS)    {        LONGLONG allTimes ;        if(SUCCEEDED(pMS->GetDuration(&allTimes)))        {                    time = (float)allTimes / 10000000 ;            return time;        }    }    return 0 ;}float CPlayControl::GetCurrentPosition(){    float time ;    if(pMS)    {        LONGLONG theTimes ;        if(SUCCEEDED(pMS->GetCurrentPosition(&theTimes)))        {            time = (float)theTimes / 10000000 ;            return time;        }    }    return 0 ;}