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page trail:  Templot Club > Forums > OpenTemplot Project > Help Window Printing Issue
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                 Help Window Printing Issue
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1st message | this message only posted: 8 Aug 2018 03:02
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Frank Sergent
Tennessee USA


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Hi All,
I have cloned the OpenTemplot project from SourceForge and have built it and I'm currently trying to debug a help screen print crash. So I can print templates with OpenTemplot just fine (which is more than I can currently do with Templot2 because it can't find a printer and I have several).  If I run OpenTemplot from the Lazarus IDE and then I do "background - shapes", then "help - background shapes help", then press the "print" button on the resulting help screen, then the Windows print dialog comes up as expected (even if it is hidden under the help window, grrrr) and ask me for a printer. I like the default printer so I press OK. Then I get a nice window that says Project OpenTemplot raised exception class 'External SIGSEGV' at address 10003BA45. I'm guessing that's a segment fault due to trying to copy a string into an uninitialized variable.

I've attached a screen shot of the program at a breakpoint getting ready to crash as soon as I hit run again. You can see the file in question and the line number as well as the watch window showing that PrnDev.Device looks valid. Device is declares as a PWideChar. If this were C, I would say the problem is obvious and Device should be declared as a char array instead of a pointer to a char. But its not C and I'm not certain StrCopy parameters are dest then src like the C strcpy or if its the other way around and that's the real problem.

Any ideas?


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2nd message | this message only posted: 8 Aug 2018 17:51
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Martin Wynne
West Of The Severn, United Kingdom

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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
Hi Frank,

Welcome to Templot Club and thanks for the introduction. :)

I'm concerned that you are having problems printing from Templot2. I haven't had any similar reports.

Please note that if you want to use a printer for the track templates from Templot, it must be switched on and available to the system before you start Templot. That's because on start-up Templot creates its own list of available printers, so that it has somewhere to put the calibration data.

Thanks also for getting into OpenTemplot.

The latest full versions of the OT files are in the attached .zip file at:

I don't think Adrian has yet got round to putting them on Sourceforge.

Note that the printing problem you are having is not in Templot itself, it is in the HtmlViewer component from:

Templot2 uses the original Delphi version of that component from David Baldwin, but it won't compile in Lazarus. Mainly because it makes much use of Windows Metafiles (as does Templot2 for the sketchboard) which are not cross-platform and therefore not supported on Lazarus.

There is an updated version of the component from Bernd Gabriel for Lazarus on the above link, but I have noticed that it still contains some problems. It also needs some of my mods to work as intended with Templot. I have included the files and the mods in the OpenTemplot files in the above-mentioned .zip, so that it is no longer strictly necessary to install the package in order to compile OpenTemplot. However, it is still necessary to do so if you want to edit any of the the form files containing the HtmlViewer.

All of which is a round-about way of saying that to resolve the problem it needs to be taken up with Bernd Gabriel on the above link. There is not much we can do here in Templot, unless someone wants to set about working on the vwPrint.pas file. Without TMetafile I'm not too sure how to proceed.

I did mention this at:

at item 3. - more work needed - text printing, metafiles.

Very old versions of Templot did not use the internal printing functions in HtmlViewer and instead sent the original help string to the printer, i.e. the string before conversion to HTML. We may need to go back to that for OT., although the printed results are inferior.



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