diskdemo.c

模拟协处理器功能的 C 语言源码

#include <fpclib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>

void TestDosErrNo( void );


char      Buf[20000];
FILE      Text;
long int  FilSize;
int       Handle,NBytes,WBytes;
char      Done,Ch;

void TestDosErrNo( void )
{
   int rc = 0;

   if ( DosErrNo || CErrCode ) {
      printf( "DosErrNo   = %d     \n", DosErrNo   );
      printf( "CErrCode   = %d     \n", CErrCode   );
      printf( "CErrType   = %d     \n", CErrType   );
      printf( "CErrDrive  = %d     \n", CErrDrive  );
      printf( "CErrDevice = %s   \n\n", CErrDevice );
      ResetErrCodes();
      rc++;
   }
   printf("\nPress Enter to continue...");
   GetKey();
   printf( "\n" );
}

void main( void )
{
   VioInit();
   GotoxyAbs( 1, 1 );

   memset( Buf, 'A', sizeof( Buf ) );
   ClrWin( 1, 1, 80, 25, 7 );
   SetInt24();

   printf( "doing createfile\n" );
   CreateFile( "a:Test", 0, &Handle );
   TestDosErrNo();

   printf( "doing writefile\n" );
   WriteFile( Handle, sizeof( Buf ), Buf, &WBytes );
   TestDosErrNo();


   printf( "doing closefile\n" );
   CloseFile( Handle );
   TestDosErrNo();

   printf( "doing openfile\n" );
   OpenFile( "A:Test", 2, &Handle );
   TestDosErrNo();

   printf( "doing FSeek\n" );
   printf( "FilSize = %ld\n", FSeek( Handle, 0, 15100L ) );
   TestDosErrNo();

   printf( "doing FSeek again...\n" );
   printf( "FilSize = %ld\n", FSeek( Handle, 0, 0L ) );
   TestDosErrNo();

   printf( "do ReadFile\n" );
   ReadFile( Handle, sizeof( Buf ), Buf, &WBytes );
   TestDosErrNo();
   printf( "Number of bytes read = %u\n", WBytes );

   printf( "do CloseFile\n" );
   CloseFile( Handle );
   TestDosErrNo();
}