[fpc-pascal] PTCGraph Causing 217

James Richters james.richters at productionautomation.net
Wed Jan 6 16:44:31 CET 2021


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.
 
James
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