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CMIDI.CPP
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CMIDI.CPP
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#include "stdafx.h"
#include "cmidi.h"
#include <mmsystem.h>
#define MCI_ERROR_LENGTH 129
#ifdef WIN32
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#endif
void CMidi::Init(HWND hWnd)
{
m_hwndToNotify=hWnd;
char * TempDir=getenv("TEMP");
if (TempDir == NULL)
TempDir=getenv("TMP");
if (TempDir != NULL)
m_sMidiFile=CString(TempDir)+"\\btl.rmi";
else
m_sMidiFile="c:\\btl.rmi";
m_sLastMidi="";
} // ::Init
CMidi::CMidi()
{
m_bMidiInitialized = FALSE;
m_uMCIDeviceID=0;
m_bMute=FALSE;
}
CMidi::~CMidi()
{
Close();
}
void CMidi::Play(char * MidiName)
{
if (m_sLastMidi != CString(MidiName))
{
HINSTANCE hInst = AfxGetInstanceHandle();
HRSRC hResInfo = FindResource(hInst, MidiName, "MIDIMUSIC");
if (hResInfo == NULL)
{
ASSERT(0);
return;
}
HGLOBAL hRes = LoadResource(hInst, (HRSRC)hResInfo);
if (hRes == NULL)
{
ASSERT(0);
return;
}
LPBYTE lpRes = (LPBYTE)LockResource(hRes);
if (lpRes == NULL)
{
ASSERT(0);
return;
}
FILE * pMidFile=fopen(LPCSTR(m_sMidiFile),"wb");
int size=0,nWritten=1;
if (pMidFile)
{
size=*(DWORD *)((lpRes+sizeof(DWORD)));
size+=8;
nWritten=fwrite(lpRes,1,size,pMidFile);
fclose(pMidFile);
}
UnlockResource(hRes);
FreeResource(hRes);
hRes = NULL;
m_sLastMidi = CString(MidiName);
if (nWritten != size)
return;
}
PlayFile();
}
void CMidi::PlayFile()
{
DWORD dwReturn;
MCI_OPEN_PARMS mciOpenParms;
char mciErrorString[MCI_ERROR_LENGTH];
UINT mciErrorLen;
BOOL KnownError = FALSE;
Close();
mciOpenParms.lpstrDeviceType = "sequencer";
mciOpenParms.lpstrElementName = LPCSTR(m_sMidiFile);
if (dwReturn = mciSendCommand(NULL, MCI_OPEN,
MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,
(DWORD)(LPVOID) &mciOpenParms))
{
mciErrorLen = MCI_ERROR_LENGTH;
KnownError = mciGetErrorString(dwReturn, mciErrorString, mciErrorLen);
TRACE("Couldn't Open Midi Device in constructor\n");
if (KnownError)
TRACE("MCI ERROR : %s\n", mciErrorString);
else
TRACE("MCI ERROR : Unknown Error (%x)!!!!! \n",dwReturn);
// Failed to open device. Don't close it; just return error.
m_bMidiInitialized = FALSE;
return;
}
// The device opened successfully; get the device ID.
m_uMCIDeviceID = mciOpenParms.wDeviceID;
m_bMidiInitialized = TRUE;
MciPlay();
}
void CMidi::Mute()
{
m_bMute=TRUE;
MciStop();
}
void CMidi::UnMute()
{
m_bMute=FALSE;
MciPlay();
}
void CMidi::Stop()
{
Close();
}
void CMidi::Close()
{
DWORD dwReturn;
char mciErrorString[MCI_ERROR_LENGTH];
UINT mciErrorLen;
BOOL KnownError = FALSE;
if (!m_uMCIDeviceID) return;
MciStop();
dwReturn =mciSendCommand(m_uMCIDeviceID, MCI_CLOSE, 0, NULL);
if (dwReturn)
{
mciErrorLen = MCI_ERROR_LENGTH;
KnownError = mciGetErrorString(dwReturn, mciErrorString, mciErrorLen);
TRACE("Couldn't Close Midi Device \n");
if (KnownError)
TRACE("MCI ERROR : %s\n", mciErrorString);
else
TRACE("MCI ERROR : Unknown Error (%x)!!!!! \n",dwReturn);
}
else
m_uMCIDeviceID=NULL;
}
void CMidi::MciStop()
{
DWORD dwReturn;
MCI_GENERIC_PARMS mciGenParms;
MCI_STATUS_PARMS mciStatParms;
// Error message mechanism
char mciErrorString[MCI_ERROR_LENGTH];
UINT mciErrorLen;
BOOL KnownError = FALSE;
// Check if MIDI was intialized at all
if (!m_bMidiInitialized)
return;
memset(&mciStatParms,0,sizeof(mciStatParms));
mciStatParms.dwItem = MCI_STATUS_MODE;
if ( (dwReturn = mciSendCommand(m_uMCIDeviceID, MCI_STATUS,
MCI_STATUS_ITEM, (DWORD) (LPMCI_STATUS_PARMS) &mciStatParms)) != 0)
{
mciErrorLen = MCI_ERROR_LENGTH;
KnownError = mciGetErrorString(dwReturn, mciErrorString, mciErrorLen);
TRACE("Couldn't Get Midi status in MidiStop\n");
if (KnownError)
TRACE("MCI ERROR : %s\n", mciErrorString);
else
TRACE("MCI ERROR : Unknown Error (%x)!!!!! \n",dwReturn);
}
// Check if midi is being played at all
if (mciStatParms.dwReturn != MCI_MODE_PLAY)
return;
mciGenParms.dwCallback=0;
if ( (dwReturn = mciSendCommand(m_uMCIDeviceID, MCI_PAUSE, 0L,
(DWORD)(LPMCI_GENERIC_PARMS) &mciGenParms)) != 0)
{
mciErrorLen = MCI_ERROR_LENGTH;
KnownError = mciGetErrorString(dwReturn, mciErrorString, mciErrorLen);
TRACE("Couldn't PAUSE Midi seq. in MidiStop\n");
if (KnownError)
TRACE("MCI ERROR : %s\n", mciErrorString);
else
TRACE("MCI ERROR : Unknown Error (%x)!!!!! \n",dwReturn);
// Failed. Close Device and return error.
//mciSendCommand(m_uMCIDeviceID, MCI_CLOSE, 0, NULL);
//m_uMCIDeviceID = 0;
//m_bMidiInitialized = FALSE;
//return FALSE;
}
m_bMidiIsPlaying = FALSE;
return;
}
void CMidi::MciPlay()
{
DWORD dwReturn;
MCI_PLAY_PARMS mciPlayParms;
DWORD dwFlags = MCI_FROM | MCI_NOTIFY;
// Error message mechanism
char mciErrorString[MCI_ERROR_LENGTH];
UINT mciErrorLen;
BOOL KnownError = FALSE;
if (!m_uMCIDeviceID || m_bMute) return;
memset(&mciPlayParms, 0, sizeof(MCI_PLAY_PARMS));
mciPlayParms.dwCallback=MAKELONG(m_hwndToNotify,0);
if (dwReturn = mciSendCommand(m_uMCIDeviceID, MCI_PLAY, dwFlags,
(DWORD)(LPVOID) &mciPlayParms))
{
mciErrorLen = MCI_ERROR_LENGTH;
KnownError = mciGetErrorString(dwReturn, mciErrorString, mciErrorLen);
TRACE("Couldn't Play Midi seq. in PlaySequence\n");
if (KnownError)
TRACE("MCI ERROR : %s\n", mciErrorString);
else
TRACE("MCI ERROR : Unknown Error (%x)!!!!! \n",dwReturn);
// Failed. Close Device and return error.
mciSendCommand(m_uMCIDeviceID, MCI_CLOSE, 0, NULL);
m_uMCIDeviceID = 0;
m_bMidiInitialized = FALSE;
return;
}
m_bMidiIsPlaying = TRUE;
}
LRESULT CMidi::CallBack(WPARAM wFlags,LPARAM lDevID)
{
if ((wFlags & MCI_NOTIFY_SUCCESSFUL) && (UINT)lDevID == m_uMCIDeviceID)
MciPlay();
return 0;
}
void CMidi::UnInit()
{
Stop();
remove(m_sMidiFile);
}