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864天前#include <stdio.h> |
#include <conio.h> |
#include <dos.h> |
#define IGNORE 0 |
#define RETRY 1 |
#define ABORT 2 |
int buf[500]; |
/*define the error messages for trapping disk problems*/ |
static char *err_msg[] = { |
"write protect", |
"unknown unit", |
"drive not ready", |
"unknown command", |
"data error (CRC)", |
"bad request", |
"seek error", |
"unknown media type", |
"sector not found", |
"printer out of paper", |
"write fault", |
"read fault", |
"general failure", |
"reserved", |
"reserved", |
"invalid disk change" |
}; |
error_win(char *msg) |
{ |
int retval; |
cputs(msg); |
/*prompt for user to press a key to abort, retry, ignore*/ |
while(1) |
{ |
retval= getch(); |
if (retval == 'a' || retval == 'A') |
{ |
retval = ABORT; |
break; |
} |
if (retval == 'r' || retval == 'R') |
{ |
retval = RETRY; |
break; |
} |
if (retval == 'i' || retval == 'I') |
{ |
retval = IGNORE; |
break; |
} |
} |
return(retval); |
} |
/*pragma warn -par reduces warnings which occur |
due to the non use of the parameters errval, |
bp and si to the handler.*/ |
#pragma warn -par |
int handler(int errval,int ax,int bp,int si) |
{ |
static char msg[80]; |
unsigned di; |
int drive; |
int errorno; |
di= _DI; |
/*if this is not a disk error then it was |
another device having trouble*/ |
if (ax < 0) |
{ |
/* report the error */ |
error_win("Device error"); |
/* and return to the program directly requesting abort */ |
hardretn(ABORT); |
} |
/* otherwise it was a disk error */ |
drive = ax & 0x00FF; |
errorno = di & 0x00FF; |
/* report which error it was */ |
sprintf(msg, "Error: %s on drive %c\r\nA)bort, R)etry, I)gnore: ", |
err_msg[errorno], 'A' + drive); |
/* |
return to the program via dos interrupt 0x23 with abort, retry, |
or ignore as input by the user. |
*/ |
hardresume(error_win(msg)); |
return ABORT; |
} |
#pragma warn +par |
int main(void) |
{ |
/* |
install our handler on the hardware problem interrupt |
*/ |
harderr(handler); |
clrscr(); |
printf("Make sure there is no disk in drive A:\n"); |
printf("Press any key ....\n"); |
getch(); |
printf("Trying to access drive A:\n"); |
printf("fopen returned %p\n",fopen("A:temp.dat", "w")); |
return 0; |
} |
