sonny@charybdis.harris-atd.com (Bob Davis) (02/17/91)
I am trying to write a TSR to invoke a command when the hot key triggers by making use of INT 21h, Function 4Bh (the DOS EXEC function). I succeed in invoking the command, but after the command completes, a return is not made to my TSR code at the point immediately after the EXEC invocation as I desire. My system simply hangs, requiring a reboot. I have attempted to set a terminate address via INT 22h but that has failed. How do I make my TSR regain control immediately after the EXEC'd command completes? I'm SO frustrated... Thanks, _____________________________________________________________________________ Bob Davis, UofALA alum \\ INTERNET: sonny@trantor.harris-atd.com | _ _ | Harris Corporation, ESS \\ UUCP: ...!uunet!x102a!trantor!sonny |_| |_| | | Advanced Technology Dept.\\ AETHER: K4VNO |==============|_/\/\/\|_| PO Box 37, MS 3A/1912 \\ VOICE: (407) 727-5886 | I SPEAK ONLY | |_| |_| | Melbourne, FL 32902 \\ FAX: (407) 729-3363 | FOR MYSELF. |_________|
kds@physics (Kevin Stokes) (02/20/91)
In article <5534@trantor.harris-atd.com> sonny@trantor.harris-atd.com (Bob Davis) writes: > > I am trying to write a TSR to invoke a command when >the hot key triggers by making use of INT 21h, Function 4Bh (the >DOS EXEC function). If you interrupt the operation of a DOS program with a hotkey, you can't turn around and use a DOS call to do anything with making sure you haven't interrupted a DOS call which was in progress when you struck the hot key. IE DOS is not re-entrant. Also, since function 4Bh uses the disk drive, a new DTA address and everything will have to be set. Writing a TSR which actually loads and executes a program is a very complex project. There are some books which contain the info needed, but none of them are very complete. -Kevin -- Kevin Stokes 1-919-684-8256 Duke University Dept. of Physics kds@phy.duke.edu Durham, N.C. 27706