Keyboard handling in C

[anon856525]

Hi,

I'm trying to write a keyboard handle with Borland. I think the code
below should work, but it doesn't compile. The problem is I cannot set
the return of
getvect() to a void interrupt (*)(), ie

void interrupt (*old_int9)();

....

old_int9 = getvect (0x9);

I need a void interrupt function pointer so I can chain the old handle
to the new handle. Any help much appreciated. I'll attach the rest
of
the example program.


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

#define TRUE 1
#define FALSE 0

void interrupt (*old_int9)();

void interrupt new_int9();

int scan_code,done = FALSE;

void interrupt new_int9()
{
disable();
scan_code = inport(0x60);
if (scan_code == 0x3b) done = TRUE; /* done = TRUE when F1 pressed */
old_int9(); /* chain the old interrupt */
enable();

}

void main ()
{
int old_scan_code;
char buffer[256];

clrscr();
old_int9 = getvect(0x9);
setvect (0x09,new_int9);

while (!done)
{ if (kbhit) getche();

}

setvect (0x09,old_int9);
}

 

[user923005]

Hi,

I'm trying to write a keyboard handle with Borland. I think the code
below should work, but it doesn't compile. The problem is I cannot set
the return of
getvect() to a void interrupt (*)(), ie

[snip]

You want
In the C-FAQ, section 19 is on "System Dependencies" like keyboard
interrupts, etc., but it won't really address your questions.

 

[CBFalconer]

I'm trying to write a keyboard handle with Borland. I think the
code below should work, but it doesn't compile. The problem is I
cannot set the return of getvect() to a void interrupt (*)(), ie

void interrupt (*old_int9)();

...

old_int9 = getvect (0x9);

I need a void interrupt function pointer so I can chain the old
handle to the new handle. Any help much appreciated. I'll
attach the rest of the example program.

Modern Winders won't allow you to do that. You need to try a DOS
newsgroup, or possibly W98 or W95.