size_t fread ( void *buffer, size_t size, size_t count, FILE *stream) ;

参 数
buffer：用于接收数据的内存地址
size：要读写的字节数，单位是字节
count：要进行读写多少个size字节的数据项,每个元素是size字节.
stream：输入流

读取wav文件头的示例

struct wavhdr{
	char riff[4]; //<span style="color: rgb(102, 102, 102); font-family: verdana, sans-serif; font-size: 16px; line-height: 21px;">"RIFF"标志 </span>
	unsigned long FileSize;//<span style="color: rgb(102, 102, 102); font-family: verdana, sans-serif; font-size: 16px; line-height: 21px;">文件长度 </span>
	char wave[4];
	char fmt[4];
	unsigned long wFormatLength;
	unsigned short wFormatTag;
	unsigned short nChannels;
	unsigned long nSamplesPerSec;
	unsigned long nAvgBytesPerSec;
	unsigned short nBlockAlign;
	unsigned short wBitsPerSample;
	char data[4];
	unsigned long datasize;
};

<pre name="code" class="cpp">	FILE * pFile = NULL; 

        pFile = fopen(filepath.c_str(), "rb");
	if (pFile != NULL)
	{
		wavhdr pWav;

		fread(pWav.riff,4,1,pFile); //读取4个字节
		fread(&(pWav.FileSize),1,4,pFile);//读取1个字节

		fclose(pFile);

      }	

file的fread函数使用