filewrite()

#include "stdafx.h"
#include <stdio.h>

int _tmain(int argc, _TCHAR* argv[])
{

 FILE * pFile;
 char buffer[] = { 'x' , 'y' , 'z' };
 pFile = fopen ( "myfile.bin" , "wb" );//fopen打开失败返回NULL

if(pFile!=NULL)

{

   fwrite (buffer , sizeof(buffer), 1 , pFile );

 }
  fclose (pFile); 

 return 0;
}

结果：向myfile.bin文件中写入三个字节xyz