重定向用fscanf方法

 

int Load_Palette_From_File(char *filename, LPPALETTEENTRY palette)
...{
// this function loads a palette from disk into a palette
// structure, but does not set the pallette

FILE *fp_file; // working file

// try and open file
if ((fp_file = fopen(filename,"r"))==NULL)
   return(0);

// read in all 256 colors RGBF
for (int index=0; index<MAX_COLORS_PALETTE; index++)
    ...{
    // read the next entry in
    fscanf(fp_file,"%d %d %d %d",&palette[index].peRed,
                                 &palette[index].peGreen,
                                 &palette[index].peBlue,                                
                                 &palette[index].peFlags);
    } // end for index

// close the file
fclose(fp_file);

// return success
return(1);
} // end Load_Palette_From_Disk

 

关于scanf方法：

// crt_fscanf.c
/* This program writes formatted
 * data to a file. It then uses fscanf to
 * read the various data back from the file.
 */

#include <stdio.h>

FILE *stream;

int main( void )
{
   long l;
   float fp;
   char s[81];
   char c;

   stream = fopen( "fscanf.out", "w+" );
   if( stream == NULL )
      printf( "The file fscanf.out was not opened/n" );
   else
   {
      fprintf( stream, "%s %ld %f%c", "a-string",
               65000, 3.14159, 'x' );
      // Security caution!
      // Beware loading data from a file without confirming its size,
      // as it may lead to a buffer overrun situation.
      /* Set pointer to beginning of file: */
      fseek( stream, 0L, SEEK_SET );

      /* Read data back from file: */
      fscanf( stream, "%s", s );
      fscanf( stream, "%ld", &l );

      fscanf( stream, "%f", &fp );
      fscanf( stream, "%c", &c );

      /* Output data read: */
      printf( "%s/n", s );
      printf( "%ld/n", l );
      printf( "%f/n", fp );
      printf( "%c/n", c );

      fclose( stream );
   }
}
Output
a-string
65000
3.141590
x