Debug  LCL library
lazarus / 12-Debugger

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ShaunS · 2013-06-27 16:22

Hi,

I am trying to debug a library that depends on LCL.

The only reason it needs the LCL is for generating graphics using
canvas functionality.

The library works well, but the problem is that I am working blind.

The library debugged correctly until I added the LCL dependencies.

When I try and debug the library I get:
The application was unable to start correctly (0xc0000142). Click Ok
to close the application.

Windows 7 32 bit
Lazarus 1.0.10
FPC 2.6.2

Thank you,
Shaun

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Martin_fr · 2013-06-27 18:03

From what I googled you should get this error independent of using a
debugger or running without.

When debugging, to you use the same app as starter app, that would use
the dll outside the debugger?

Most stuff I found refers to this error being a dependency issue, some
suggesting related to resources.

LCL code does actually load resources from the exe, maybe in unit
initialization. If so, and if in a dll, then I wonder what it uses for
the exe....

Sorry not of much help, but that all I got.

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ShaunS · 2013-07-02 11:27

Hi Martin,

Thank you for your help. It allowed me to get to the solution.

"From what I googled you should get this error independent of using a
debugger or running without."
I retested this and you are correct. I always get the error. It turns
out that the test app and the DLL both use the LCL. This causes the
crash.

The main application I use the library in does not use the LCL. This
is why it works in the main application.

From: http://lists.lazarus.freepascal.org/pipermail/lazarus/2009-
May/043313.html

The LCL works inside DLLs, I have managed to wrap it and use it in C
this way.

Basically if either only the library or only the main program use LCL
it works, but if both use the LCL, then there are problems with
connecting both parts.

--
Felipe Monteiro de Carvalho

Thanks again,
Shaun