tribby@hpindda.HP.COM (David Tribby) (05/26/88)
I use TML Pascal running under APW to write programs for the IIGS. For months, I have noticed an intermittent problem that causes the entire system to crash when I select the "About..." item on the menu. This week, I believe I nailed down the conditions under which the crash will occur: Boot system, and enter APW Run my application (an EXE, not S16 file) as first program Choose "About..." menu item as the first action The program draws the frame and background for the "about" dialog, then crashes in one of several ways... "BRK"s and enters the monitor Goes into some infinite loop; hard reset required to regain control Causes a series of beeps (multiple crashes into the monitor!) Sometimes it turns the super hi-res cursor into garbage It always seems to trash my RAM disk My system has 1.25 meg (96K for /RAM5) and is running with the latest ROMs and system software. I think I found the problem last night, but because it is intermittent it is hard to be sure. I took a very close look at the (fairly simple) code making up the "About..." procedure, which was copied from TML's demos: 1. Create a modal dialog 2. Create a "continue" button as item number 1 3. Make "continue" the default button 4. Draw explanation text on the screen 5. Wait for user to press "continue" 6. Shut down dialog and return. I recalled reading that item number 1 is the normal default button, so step 3 is redundant. I took out the call to SetDefButton and recompiled one application. It did not crash under the "most likely" conditions. A second program continued to crash until I modified it...then it ran without problems. My questions: - Have you seen any problems similar to my description? - Can someone else verify that SetDefBuffon causes a crash? - How can I be sure I fixed the problem? Dave Tribby - - - - - ARPA: tribby%hpda@hplabs.HP.COM UUCP: hplabs!hpda!tribby