fwrite函数应用

fwrite函数应用

函数原型:

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

参数列表:

buffer    // 被写数据缓冲区的首地址,Pointer to data to be written   

size  //一次写入数据块的大小,Item size in bytes

count  // 写如数据快的次数,Maximum number of items  to be written

stream  // 文件结构指针,Pointer to FILE structure

    FILE *  f  =  fopen( " a.exe " , " wb " );
     int  nStep = buffer.length() / 4096   + 1 ;
     int  nPie = 4096 ;
     int  nCur = 0 ;
     int  nLeft  =  buffer.length();

     int  nWrite  =   0 ;
     for  ( int  i = 0 ;i != nStep;i ++ )
     {
        fwrite(buffer.c_str()+nPie*i,nPie,1,f);        
    }
    fflush(f);
    fclose(f);