🚀 go-pugleaf

david j. looney (me41@sdcc12.ucsd.edu) wrote:
: Speaking of which, for us lowly gnu (golly its not kansas) gcc
: folks, is there ANY workaround in character mode to read single
: characters from the keyboard ala getch() ? Do more recently updated
: libs support this function? Can one call a supplied vio or pm
: functions from a window compatible program ?
: 

If your program is not a PM program, you should be able to use the KbdCharIn
function to do what you want.  You might even write a getch() which contains
the call to KbdCharIn.  Unfortunately, KbdCharIn is not documented in
any of the .Inf files with the 2.0 toolkit.  It is a 1.x API function
that is still supported (so why no documentation??).  If you don't have
access to a 1.x API document, Ray Duncan's book Advanced OS/2 programming
as well as several other OS/2 programming books (those not targeted for
PM programming) will have it.  The call requires a handle returned
by KbdOpen.  All the applications in which I have used it are single
threaded on the keyboard so I have a static variable (private to the
module containing getch() or whatever you call it) that is initialized
to something illegal (-1 I think works) and then I do a KbdOpen only
if that initial value is still present and store the returned handle
in the variable.

I haven't tested this, but something like this might work:

#define INCL_KBD
#include <os2.h>

static HKBD hKbd = 0xFFFF;

char getch(void)
{
	KBDKEYINFO info;

	if(hKbd == 0xFFFF) [

	        KbdOpen(&hKbd);
		KbdGetFocus(IO_WAIT,hKbd);
		}

	KbdCharIn(&info,IO_WAIT,hKbd);

	return (char)(info.chChar);
} 

Some examples I've seen use 0 for hKbd without opening it or doing
a get focus on it.  This might be defined to work, but I don't know
if it is reliable.

Good luck.