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);
}

On Jan 21, 2:24=A0pm, anon856...@gmail.com wrote:
> 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 news:comp.os.msdos.programmer

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

anon856525@gmail.com wrote:
> 
> 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.

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