midifile.cpp

MiniWinOuterSM MiniWinOuterSM

/////////////////////////////////////////////////////////////////////////////
// Copyright (C) 1998,'99 by J鰎g K鰊ig
// All rights reserved
//
// This file is part of the completely free tetris clone "CGTetris".
//
// This is free software.
// You may redistribute it by any means providing it is not sold for profit
// without the authors written consent.
//
// No warrantee of any kind, expressed or implied, is included with this
// software; use at your own risk, responsibility for damages (if any) to
// anyone resulting from the use of this software rests entirely with the
// user.
//
// Send bug reports, bug fixes, enhancements, requests, flames, etc., and
// I'll try to keep a version up to date.  I can be reached as follows:
//    [e-mail]                 (company site)
//    [e-mail]    (private site)
//
// Revision 2, 04/27/99
/////////////////////////////////////////////////////////////////////////////


// MidiFile.cpp: implementation of the CMidiFile class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "MidiFile.h"


#include <io.h>

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

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CMidiFile::CMidiFile()
	: m_hFile(0)
	, m_hMem(0)
	, m_pData(0)
{
}


CMidiFile::~CMidiFile()
{
	FreeMusicFile();
}


BOOL CMidiFile::Create(const CString & strFile, CWnd * pWnd) {
	// free a previously mapped music file
	FreeMusicFile();

	if( ::_taccess(strFile, 0) == 0 ) {
		// load the file
		m_hFile = ::CreateFile(strFile, GENERIC_READ, FILE_SHARE_READ,
				0, OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
		if(m_hFile != INVALID_HANDLE_VALUE) {
			DWORD dwSize = ::GetFileSize(m_hFile, 0);
			m_hMem = ::CreateFileMapping(m_hFile, 0, PAGE_READONLY, 0, dwSize, 0);
			if(m_hMem != 0) {
				m_pData = ::MapViewOfFile(m_hMem, FILE_MAP_READ,
										0, 0, 0);
				if(m_pData) {
					// OK - now we can create the MIDI object
					BOOL bRet = CMIDI::Create(m_pData, dwSize, pWnd);

					if(bRet)
						m_strMusicFile = strFile;

					return bRet;
				}
			}
		}
	}

	return FALSE;
}


void CMidiFile::FreeMusicFile() {
	if(m_pData)
		::UnmapViewOfFile(m_pData);
	m_pData = 0;
	if(m_hMem)
		::CloseHandle(m_hMem);
	m_hMem = 0;
	if(m_hFile)
		::CloseHandle(m_hFile);
	m_hFile = 0;
}