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覆巢之下焉有完卵。出来道上混,迟早是要还的。

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亲测：写一个RIFF文件的头

2011-11-14 23:21:39| 分类：声音播放 | 标签： |举报 |字号大中小订阅

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这是一个RIFF文件的头，数据部分未写，实现这个功能的简单代码如下：

// testFile.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "Windows.h"
#include "Mmsystem.h"


#pragma comment(lib, "Winmm.lib")
int main(int argc, char* argv[])
{
 printf("Hello World!\n");
 /*
 FILE * h = fopen("c:\\pp.t","wb+");
 DWORD tmp = mmioFOURCC('W','A','V','E');
 fwrite(&tmp,sizeof(DWORD),1,h);
 fclose(h);
 */
 WAVEFORMATEX wfx;
 memset(&wfx, 0, sizeof(WAVEFORMATEX));

 wfx.cbSize=0 ;
 wfx.wFormatTag=1 ;
 wfx.wBitsPerSample=16 ;
 wfx.nChannels=2 ;
 wfx.nSamplesPerSec=22050 ;
 wfx.nAvgBytesPerSec=44100 ;
 wfx.nBlockAlign=4 ;


 HMMIO m_hWaveFile;
 MMCKINFO m_MMCKInfoParent;
 MMCKINFO m_MMCKInfoChild;

 m_hWaveFile = ::mmioOpen("c:\\p1p.t", NULL, MMIO_CREATE|MMIO_WRITE|MMIO_EXCLUSIVE|MMIO_ALLOCBUF);

 ZeroMemory ( &m_MMCKInfoParent, sizeof(MMCKINFO) );
 m_MMCKInfoParent.fccType = mmioFOURCC('W','A','V','E');//四个字符合成一个DWORD四字节编码，放到一个
 MMRESULT mmResult = ::mmioCreateChunk( m_hWaveFile, &m_MMCKInfoParent, MMIO_CREATERIFF);

 ZeroMemory ( &m_MMCKInfoChild, sizeof(MMCKINFO) );
 m_MMCKInfoChild.ckid = mmioFOURCC('f','m','t',' ');
 m_MMCKInfoChild.cksize = sizeof(WAVEFORMATEX) + wfx.cbSize;

 mmResult = ::mmioCreateChunk(m_hWaveFile, &m_MMCKInfoChild, 0);
 mmResult = ::mmioWrite(m_hWaveFile, (char*)&wfx, sizeof(WAVEFORMATEX) + wfx.cbSize); 
 mmResult = ::mmioAscend(m_hWaveFile, &m_MMCKInfoChild, 0);
 m_MMCKInfoChild.ckid = mmioFOURCC('d', 'a', 't', 'a');
 mmResult = ::mmioCreateChunk ( m_hWaveFile, &m_MMCKInfoChild, 0 ); 
 ::mmioFlush(m_hWaveFile,1);
 
 return 0;
}

::mmioFlush(m_hWaveFile,1);这句是我突然想到的，潜意识吧，因为前面见过这句，但不清楚它是什么意思，随便将第二个参数写了个1，如果没它，文件长度依然为0，估计是立即输出一类吧。

把一个WAV文件和自己存的比较，如下图：

经侧面验证，这个写入结果是正确的。

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