[fpc-pascal] PTCGraph Causing 217

[James Richters]

I've made a sample program that demonstrates the problem
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> On Behalf Of
Nikolay Nikolov via fpc-pascal
Sent: Thursday, January 7, 2021 2:17 AM
To: fpc-pascal at lists.freepascal.org
Cc: Nikolay Nikolov <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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