Lines: 38
X-Admin: news AT aol DOT com
From: sterten AT aol DOT com (Sterten)
Newsgroups: comp.os.msdos.djgpp
Date: 09 Aug 2003 06:59:39 GMT
Organization: AOL Bertelsmann Online GmbH & Co. KG http://www.germany.aol.com
Subject: get the last key pressed
Message-ID: <20030809025939.05142.00000265@mb-m01.aol.com>
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

in the program below, I get changing printouts, when I press a key,
though not the key-code.

But when I remove the printf("") , then the printout won't change
on keystroke.

(1) why ?
(2) how do I get the key-code ?




#include <stdio.h>

int getkey() {
int key=55;
__asm__ __volatile__ ("
        pushl %%eax
        movl $256,%%eax
        int $22
        andl $255,%%eax
        movl %%eax,%0
        movl $3072,%%eax
        int $33
        popl %%eax
        ":"=g"(key),"=g"(key) );
printf("");
  return(key);}


int main(int argc,char*argv[]){

mh7:printf("%i\n",getkey());
goto mh7;

return 0;
}