wavefile.cpp

用EVC编写的添加背景音乐程序,其中还有线程的创建和终止,很好的学习示例

// WaveFile.cpp: implementation of the CWaveFile class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "WaveFile.h"

#define WF_OFFSET_FORMATTAG			20
#define WF_OFFSET_CHANNELS			22
#define WF_OFFSET_SAMPLESPERSEC		24
#define WF_OFFSET_AVGBYTESPERSEC	28
#define WF_OFFSET_BLOCKALIGN		32
#define WF_OFFSET_BITSPERSAMPLE		34
#define WF_OFFSET_DATASIZE			40
#define WF_OFFSET_DATA				44
#define WF_HEADER_SIZE WF_OFFSET_DATA

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

CWaveFile::CWaveFile()
{
}

CWaveFile::~CWaveFile()
{
}


BOOL CWaveFile::Open(LPCTSTR szFileName)
{
	BYTE aHeader[WF_HEADER_SIZE];

/*	hResInfo = FindResource (hInst, lpName, "WAVE"); 

	if (hResInfo == NULL) 
	return FALSE; 

	// Load the wave resource. 
	hRes = LoadResource (hInst, hResInfo); 

	if (hRes == NULL) 
		return FALSE; 

	// Lock the wave resource and play it. 
	lpRes = */LockResource (0);


	// open file
	m_pFile = _tfopen(szFileName, TEXT("rb"));
	if (!m_pFile) {
		return FALSE;
	}

	// set file length
	fseek(m_pFile, 0, SEEK_END);
	m_nLength = ftell(m_pFile) - WF_HEADER_SIZE;

	// set the format attribute members
	fseek(m_pFile, 0, SEEK_SET);
	fread(aHeader, 1, WF_HEADER_SIZE, m_pFile);
	m_Format.wFormatTag = *((WORD*) (aHeader + WF_OFFSET_FORMATTAG));
	m_Format.nChannels = *((WORD*) (aHeader + WF_OFFSET_CHANNELS));
	m_Format.nSamplesPerSec = *((DWORD*) (aHeader + WF_OFFSET_SAMPLESPERSEC));
	m_Format.nAvgBytesPerSec = *((DWORD*) (aHeader + WF_OFFSET_AVGBYTESPERSEC));
	m_Format.nBlockAlign = *((WORD*) (aHeader + WF_OFFSET_BLOCKALIGN));
	m_Format.wBitsPerSample = *((WORD*) (aHeader + WF_OFFSET_BITSPERSAMPLE));

	return TRUE;
}

void CWaveFile::Close()
{
	fclose(m_pFile);
}

long CWaveFile::Read(char* pData, long nLength)
{
	return fread(pData, 1, nLength, m_pFile);
}