GetProcedureAddress in linux versus windows
lazarus / 67-Windows

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luis · 2017-07-25 17:07

Hi,
I'm trying to build a program that works both in windows and linux. It
uses an open source 3rd party C library that we compile using gcc in
linux and Microsoft Visual Studio 2013 in windows (that's the way the
developer recommends doing it). I load the library with LoadLibrary
and get a non-null value for the handle in both cases. But when I try
to load any entry point in windows it seems to want to use a different
(decorated?) name. So under linux I would use:
ptr := GetProcedureAddress(handle, 'flInitialise');
but under windows it seems to want for the same function:
ptr := GetProcedureAddress(LibFPGALink, '_flInitialise@12');
If I really need to do that, I can use some ifdefs, but I want to know
if that is intended or perhaps I'm doing something wrong.

Thanks

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Phil · 2017-07-25 17:23

Quote from: luis on July 25, 2017, 07:07:46 pmIf I really need to do
that, I can use some ifdefs, but I want to know if that is intended or
perhaps I'm doing something wrong.

Yes, that's correct. If it's a small number of entry points, I would
just conditionally compile.

Otherwise, you could compile 64-bits, since function names are not
decorated there. Or you could compile 32-bits with clang or gcc on
Windows.

https://msdn.microsoft.com/en-us/library/x7kb4e2f.aspx

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luis · 2017-07-25 18:17

Awesome, Thanks. Nothing beats open source support