if ( (BitStream_File= fopen("08k_temp.bs", "wb")) == NULL)
 {
     printf("Cannot Open %s\n", tmp);
     return -1;
  }
//先开个暂存档   


 if ( (BitStream_File_temp= fopen("08k.bs", "rb")) == NULL) 
 {
     printf("Cannot Open %s\n", file);
//看之前档案有无建立过
 }
 else
 {
//有建立过
           while(!feof(BitStream_File_temp))
           {
       char_read=fread(buffer,1,1024,BitStream_File_temp);
           fwrite(buffer,1,char_read, BitStream_File);
           }       
//复制
    fclose(BitStream_File_temp);
 }
//做之后的处理，把处理过后要写的档案写入暂存档中

#include <stdio.h>
#include <stdlib.h>

int main( int argc, char *argv[] )
{
    if( argc != 3 )
       {
              printf( "ERROR" );
              exit( 0 );
       }

    FILE *file1,*file2;
    char ch;

    if( ( file1 = fopen( argv[ 1 ], "r" ) ) == NULL )
       {
              printf( "ERROR" );
              exit( 0 );
       }

    file2 = fopen( argv[2], "w" );

    while( ( ch = getc( file1 ) ) != EOF )
    {
              printf( "%c", ch );
              putc( ch, file2 );
    }

    fclose( file1 );
    fclose( file2 );
       return( 0 );
}