Do Not Mix Operating System and CRT File Handles

MORE INFORMATION

Sample Code

/* Compile options needed:none
*/ 
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>
#include <windows.h>

void main( void )
{
   HFILE OsFileHandle;
   FILE *stream;
   int CrtFileHandle;
   OFSTRUCT Buffer;
   int count = 0;
   char inbuf[128];

    if ( (OsFileHandle = OpenFile("test.dat", &Buffer, OF_READ))== -1){
        printf( "OpenFile Failed");
        exit(1);
        }

    /* convert OS file handle to CRT file pointer */ 


    if ( (CrtFileHandle=_open_osfhandle(OsFileHandle,_O_RDONLY))==-1){
        printf(  "_open_osfhandle Failed");
        exit(1);
        }


   /* Change handle access to stream access. */ 
   if( (stream = _fdopen( CrtFileHandle, "r" )) == NULL ) {
        printf(  "_fdopen Failed");
        exit( 1 );
      }

   while( fgets( inbuf, 128, stream ) != NULL )
      count++;

   /* After _fdopen, close with fclose */ 
   fclose( stream );
   printf( "Lines in file: %d\n", count );
}