[fpc-pascal] PTCGraph Causing 217

[Nikolay Nikolov]

On 1/29/21 12:37 PM, James Richters wrote:
>
> Any idea what’s causing this crash yet?Is there some way I can at 
> least detect the error and handle it myself instead of crashing?
>
I'll take a look and try to reproduce it today or tomorrow. Sorry, I've 
been busy lately.

Nikolay

> James
>
> **
>
> **
>
> *From:*fpc-pascal <fpc-pascal-bounces at lists.freepascal.org> *On Behalf 
> Of *James Richters via fpc-pascal
> *Sent:* Monday, January 11, 2021 9:37 AM
> *To:* 'FPC-Pascal users discussions' <fpc-pascal at lists.freepascal.org>
> *Cc:* James Richters <james.richters at productionautomation.net>; 
> 'Nikolay Nikolov' <nickysn at gmail.com>
> *Subject:* Re: [fpc-pascal] PTCGraph Causing 217
>
> I’ve made a sample program that demonstrates the problem
>
> https://gist.github.com/Zaaphod/936901eb5f31df5044d2bd36a7cf6c91 
> <https://gist.github.com/Zaaphod/936901eb5f31df5044d2bd36a7cf6c91>
>
> When I was testing it, I found out that the problem shows up also with 
> PTCCRT.Keypressed,
>
> Procedure to re-produce bug in Putimage
>
> 1.Run program in Windows
>
> 2.Do something that activates Windows User Account Control like open 
> an administrator command prompt
>
> 3.Program crashes with exitcode 217 EAccessViolation: Access violation 
> on line 108 which is doing Putimage, even if you answer NO to user 
> account control
>
> Procedure to re-produce bug in Keypressed
>
> 1.UnComment //Until ptccrt.Keypressed;Comment out //Until 
> ptccrt.Keypressed;
>
> 2.Run Program in Windows
>
> 3.Do something that activates Windows User Account Control like open 
> an administrator command prompt
>
> 4.Program crashes with exitcode 217 EAccessViolation: Access violation 
> on line 114 which is doing Keypresed (sometimes the error is on putimage)
>
> Other things that cause it:
>
> Unplug monitor and plug it back in
>
> Change Display settings
>
> Putting computer to sleep
>
> Unknown reasons… system just idle
>
> James
>
> *From:*fpc-pascal <fpc-pascal-bounces at lists.freepascal.org 
> <mailto:fpc-pascal-bounces at lists.freepascal.org>> *On Behalf Of 
> *Nikolay Nikolov via fpc-pascal
> *Sent:* Thursday, January 7, 2021 2:17 AM
> *To:* fpc-pascal at lists.freepascal.org 
> <mailto:fpc-pascal at lists.freepascal.org>
> *Cc:* Nikolay Nikolov <nickysn at gmail.com <mailto:nickysn at gmail.com>>
> *Subject:* Re: [fpc-pascal] PTCGraph Causing 217
>
> On 1/6/21 5:44 PM, James Richters via fpc-pascal wrote:
>
>     I’ve been having issues with PTCGraph causing a runtime Error 217
>     : EAccessViolation: Access violation at seemingly random times in
>     my program.The error is always on a line with either GetImage() or
>     PutImage() but not the same one.The program can run for hours with
>     no problems doing GetImage and PutImage every second or so, and
>     then it just stops with this error.
>
>     I know that if something disrupts the screen… like if I install a
>     program and the Windows user control thing asks for a password,
>     that ALWAYS causes this to happen, or if I unplug my monitor and
>     plug it back in…. I find that this happens.. but lately it seems
>     to happen for no reason.
>
>     I don’t know enough about it to track it down, but is there some
>     way I Can find out what causes this and prevent the error?It would
>     be nice if I could detect the condition that causes this issue,
>     and if I find that the issues is present, just stop trying to do
>     Getimage() or PutImage() until the condition is resolved.
>
> Can you provide an example program and exact steps to reproduce this bug?
>
> Nikolay
>
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