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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I have this program that is confounding me. It obtains a file name with GetOpenFileNameA then it processes the file and draws stuff on the screen, then loops back and gets another file name until GetOpenFileNameA returns a false… so as long as I keep giving it files it keeps running and if I cancel the file selection, it exits. It will run in a loop like this various numbers of times… sometimes 4 times, sometimes 8 times, sometimes twice, sometimes 30 times and then I get this access violation like this:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>An unhandled exception occurred at $0040ED07:<o:p></o:p></p><p class=MsoNormal>EAccessViolation: Access violation<o:p></o:p></p><p class=MsoNormal> $0040ED07<o:p></o:p></p><p class=MsoNormal> $00411A6C<o:p></o:p></p><p class=MsoNormal> $00411F25<o:p></o:p></p><p class=MsoNormal> $00402255 PLOTDRAWPAX, line 76 of i:/programming/gcode/mill/plotdraw.pax.pas<o:p></o:p></p><p class=MsoNormal> $00402705 main, line 119 of i:/programming/gcode/mill/plotdraw.pax.pas<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Line 76 is the a call to a procedure in another unit that’s very complicated and calls a lot of other functions and procedures.<o:p></o:p></p><p class=MsoNormal>I keep testing with the same 5 files over and over, and each file has processed fine many times so there isn’t a problem with the data in my files or the way I am processing it…. and there doesn’t seem to be a particular file that causes this. I’m thinking I have some memory issue or something is not freeing or ? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It’s also not always the same exact message.. sometimes I get <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>An unhandled exception occurred at $0040ED07:<o:p></o:p></p><p class=MsoNormal>EAccessViolation: Access violation<o:p></o:p></p><p class=MsoNormal> $0040ED07<o:p></o:p></p><p class=MsoNormal> $004026DB main, line 118 of i:/programming/gcode/mill/plotdraw.pax.pas<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Line 118 is a call to a function that is in no way related to the procedure that is called on line 76… it’s actually a ridiculously simple function. Exactly one line of code to it, and I have run that function millions of times with other programs that use the same unit.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The FPC text IDE is reporting runtime error 217 which doesn’t tell me much.. just an unhandled exception occurred.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My question is… how do I track these kinds of things down? Is there a way I can use the hex addresses to see more precisely what caused the error? <o:p></o:p></p><p class=MsoNormal>I’m confused why sometimes I get very detailed debug reports that get me to the exact command that caused the problem and other times I have some information but then it just stops and I have nothing following the hex addresses.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>James<o:p></o:p></p></div></body></html>