myplaymidi.h

gamecode 很不错的小游戏源代码

//************************************************************
//播放Midi模块
//作者：曾铮
//时间：2004年9月
//说明：用于游戏中播放Midi。
//************************************************************
#ifndef MyPlayMidi_h_
#define MyPlayMidi_h_

#define INITGUID

#include <dmusicc.h>
#include <dmusici.h>

//-----------------------------------------------------------------------------
// 全局变量定义
//-----------------------------------------------------------------------------
IDirectMusicLoader8*      g_pLoader         = NULL;
IDirectMusicPerformance8* g_pPerformance    = NULL;
IDirectMusicSegment8*     g_pSegment        = NULL;
bool isPlayingMidi=true;//初始化为有音乐

//文件目录
CHAR strPath[512];

void PlayMidiInit()
{
    // 初始化 COM
    CoInitialize(NULL);
    
    // 创建 loader 对象
    CoCreateInstance( CLSID_DirectMusicLoader, NULL, CLSCTX_INPROC, 
                      IID_IDirectMusicLoader8, (void**)&g_pLoader );

    // 创建 performance 对象
    CoCreateInstance( CLSID_DirectMusicPerformance, NULL, CLSCTX_INPROC, 
                      IID_IDirectMusicPerformance8, (void**)&g_pPerformance );

    // Initialize the performance with the standard audio path.
    // This initializes both DirectMusic and DirectSound and 
    // sets up the synthesizer. 
	//用标准音频路径初始化performance，并初始化DirectMusic和DirectSound,建立synthesizer
    g_pPerformance->InitAudio( NULL, NULL, NULL, 
                               DMUS_APATH_SHARED_STEREOPLUSREVERB, 64,
                               DMUS_AUDIOF_ALL, NULL );

	GetCurrentDirectory(MAX_PATH,strPath);//获取当前程序目录

    // 告诉 DirectMusic 默认搜索路径
    WCHAR wstrSearchPath[MAX_PATH+1];
    MultiByteToWideChar( CP_ACP, 0, strPath, -1, 
                         wstrSearchPath, MAX_PATH );
    wstrSearchPath[MAX_PATH] = 0;

	g_pLoader->SetSearchDirectory( GUID_DirectMusicAllTypes, 
	                               wstrSearchPath, FALSE );
	return;
}

bool PlayMidi_1()
{
	HRESULT hr;
   // Load the segment from the file
    WCHAR wstrFileName[MAX_PATH] = L"\\sound\\bkm1.mid"; 
    if( FAILED( g_pLoader->LoadObjectFromFile( CLSID_DirectMusicSegment,
                                               IID_IDirectMusicSegment8,
                                               wstrFileName,
                                               (LPVOID*) &g_pSegment ) ) )
    {
        MessageBox( NULL, "Media not found, sample will now quit", "DirectMusic Tutorial", MB_OK );
        //g_pPerformance->CloseDown();
        //g_pLoader->Release(); 
        //g_pPerformance->Release();
        //CoUninitialize();
        return false;
    }

    // Download the segment's instruments to the synthesizer
    g_pSegment->Download( g_pPerformance );
	
	// Set the segment to repeat many times
	//if( FAILED( hr = g_pSegment->SetRepeats( DMUS_SEG_REPEAT_INFINITE ) ) )
	//	return false;
	
    // Play segment on the default audio path
    g_pPerformance->PlaySegmentEx( g_pSegment, NULL, NULL, 0, 0, NULL, NULL, NULL );
	///////////////////////////////////////////////////////////////////////////////
    WCHAR wstrFileName1[MAX_PATH] = L"\\sound\\bkm2.mid"; 
    if( FAILED( g_pLoader->LoadObjectFromFile( CLSID_DirectMusicSegment,
                                               IID_IDirectMusicSegment8,
                                               wstrFileName1,
                                               (LPVOID*) &g_pSegment ) ) )
    {
        MessageBox( NULL, "Media not found, sample will now quit", "DirectMusic Tutorial", MB_OK );
        return false;
    }

    // Download the segment's instruments to the synthesizer
    g_pSegment->Download( g_pPerformance );
	
	// Set the segment to repeat many times
	if( FAILED( hr = g_pSegment->SetRepeats( DMUS_SEG_REPEAT_INFINITE ) ) )
		return false;
	
    // Play segment on the default audio path
    g_pPerformance->PlaySegmentEx( g_pSegment, NULL, NULL, DMUS_SEGF_SEGMENTEND, 0, NULL, NULL, NULL );	
	return true;
}

bool PlayMidi_2()
{
//	HRESULT hr;
   // Load the segment from the file
    WCHAR wstrFileName[MAX_PATH] = L"\\sound\\bkm2.mid"; 
    if( FAILED( g_pLoader->LoadObjectFromFile( CLSID_DirectMusicSegment,
                                               IID_IDirectMusicSegment8,
                                               wstrFileName,
                                               (LPVOID*) &g_pSegment ) ) )
    {
        MessageBox( NULL, "Media not found, sample will now quit", "DirectMusic Tutorial", MB_OK );
        //g_pPerformance->CloseDown();
        //g_pLoader->Release(); 
        //g_pPerformance->Release();
        //CoUninitialize();
        return false;
    }

    // Download the segment's instruments to the synthesizer
    g_pSegment->Download( g_pPerformance );
	
	// Set the segment to repeat many times
//	if( FAILED( hr = g_pSegment->SetRepeats( DMUS_SEG_REPEAT_INFINITE ) ) )
//		return false;
	
    // Play segment on the default audio path
    g_pPerformance->PlaySegmentEx( g_pSegment, NULL, NULL, 0, 
		0, NULL, NULL, NULL );
	return true;
}

bool PlayBGMusic()//播放背景音乐
{
	PlayMidi_1();
//	PlayMidi_2();
	return true;
}
void StopMidi()
{
    // Stop the music
    g_pPerformance->Stop( NULL, NULL, 0, 0 );
	return;
}
void FreeMidi()
{
	//close down 
    g_pPerformance->CloseDown();
    // Cleanup all interfaces
    g_pLoader->Release(); 
    g_pPerformance->Release();
    g_pSegment->Release();

    // Close down COM
    CoUninitialize();
	return;
}

#endif