multimediaplayer.cpp

evc写的Windows CE下mp3播放源码

// MultimediaPlayer.cpp : Defines the initialization routines for the DLL.
//

#include "stdafx.h"
#include "MultimediaPlayer.h"
#include <streams.h>

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

  
//
//	Note!
//
//		If this DLL is dynamically linked against the MFC
//		DLLs, any functions exported from this DLL which
//		call into MFC must have the AFX_MANAGE_STATE macro
//		added at the very beginning of the function.
//
//		For example:
//
//		extern "C" BOOL PASCAL EXPORT ExportedFunction()
//		{
//			AFX_MANAGE_STATE(AfxGetStaticModuleState());
//			// normal function body here
//		}
//
//		It is very important that this macro appear in each
//		function, prior to any calls into MFC.  This means that
//		it must appear as the first statement within the 
//		function, even before any object variable declarations
//		as their constructors may generate calls into the MFC
//		DLL.
//
//		Please see MFC Technical Notes 33 and 58 for additional
//		details.
//

/////////////////////////////////////////////////////////////////////////////
// CMultimediaPlayerApp

BEGIN_MESSAGE_MAP(CMultimediaPlayerApp, CWinApp)
	//{{AFX_MSG_MAP(CMultimediaPlayerApp)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMultimediaPlayerApp construction

CMultimediaPlayerApp::CMultimediaPlayerApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CMultimediaPlayerApp object

CMultimediaPlayerApp theApp;

IGraphBuilder *pGraph;
IMediaControl *pMediaControl;
HRESULT        hr;
IMediaSeeking  *pMediaSeeking;
bool bPauseState = false;  //设置暂停的状态
/////////////////////////////////////////////////////////////////////////////
// CMultimediaPlayerApp initialization

BOOL CMultimediaPlayerApp::InitInstance()
{
	if (!AfxSocketInit())
	{
		AfxMessageBox(IDP_SOCKETS_INIT_FAILED);
		return FALSE;
	}

	// Register all OLE server (factories) as running.  This enables the
	//  OLE libraries to create objects from other applications.
	COleObjectFactory::RegisterAll();

	return TRUE;
}

/////////////////////////////////////////////////////////////////////////////
// Special entry points required for inproc servers
/*
STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());
	return AfxDllGetClassObject(rclsid, riid, ppv);
}

STDAPI DllCanUnloadNow(void)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());
	return AfxDllCanUnloadNow();
}

// by exporting DllRegisterServer, you can use regsvr.exe
STDAPI DllRegisterServer(void)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());
	COleObjectFactory::UpdateRegistryAll();
	return S_OK;
}
*/
//初始化播放状态
void InitPlay(CString FileName)
{
    CoInitialize(NULL);

    // Create the filter graph manager.
    CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, 
                        IID_IGraphBuilder, (void **)&pGraph);
    pGraph->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);

    // Build the graph. (IMPORTANT: Change string to a file on your system.)
    pGraph->RenderFile(FileName, NULL); 
	pMediaSeeking=0;
	hr = pGraph->QueryInterface(IID_IMediaSeeking, (void**)&pMediaSeeking);
}

void Play(CString FileName)
{
	//如果不是暂停后继续接着原来的位置播放
	//那么初始化播放状态，加载新的播放文件
	if(!bPauseState)
	{
		InitPlay(FileName);
	}
  	// Run the graph.
    hr = pMediaControl->Run();
	bPauseState = false;  //取消暂停
}

//结束播放
void EndPlay()
{
	//释放资源
    pMediaControl->Release();
    pGraph->Release();
    CoUninitialize();
}

//暂停处理
void PausePlay(CString FileName)
{
	pMediaControl->Pause();
	bPauseState = true;      //设置暂停
}