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DLL Talk / Using a PureBasic DLL in VS

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OSX Using Happy Dude
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Posted: 5th Aug 2006 14:02 Edited at: 5th Aug 2006 14:02
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I'm trying to get a PureBasic imported into VS, but at the moment it keeps saying the function cant be found.

I've tried using #pragma comment and __declspec(dllimport), but nothing seems to work, and, of course, putting the .LIB file into the workspace.

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Freddix
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Posted: 5th Aug 2006 22:51
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which version of Pure do you use ? 4.0 ?
don't forget that pure use undecorated functions form...

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OSX Using Happy Dude
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Posted: 6th Aug 2006 00:39
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4.0

Using __declspec(dllimport) should do it, but unfortunately it doesn't

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Freddix
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Posted: 6th Aug 2006 01:41 Edited at: 6th Aug 2006 01:42
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in your PureBASIC DLL, do you use :

Procedure MyProcedure( ... ) ?
or
ProcedureCDLL MyProcedure( ... ) ?

Procedure MyProcedure(...):
Is local to the DLL and can't be reached from another DLL

ProcedureDLL MyProcedure(...)
& ProcedureCDLL MyProcedure(...) :
Are global and can't be called from another DLL.

your problem maybe came from here ?
Otherwise, try to give more informations (error message, how it react...)

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OSX Using Happy Dude
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Posted: 6th Aug 2006 01:47 Edited at: 6th Aug 2006 01:48
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PB Code :



VS Code (with TestDLL.lib added to the workspace) :



And the message I get is :

estDarkSDK.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) void __cdecl _openConsole(void)" (__imp_?_openConsole@@YAXXZ)

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empty
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Posted: 6th Aug 2006 03:29
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From the error message it seems to expect a decorated function name. Prolly put an extern "C" in front of your prototyped function (not that I know a lot about VS)?


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IanM
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Posted: 6th Aug 2006 12:05
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Nick, post up a PB DLL that does something like messagebox and we can play around with it.

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OSX Using Happy Dude
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Posted: 6th Aug 2006 12:08
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This is the PB stuff

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OSX Using Happy Dude
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Posted: 6th Aug 2006 12:10 Edited at: 6th Aug 2006 12:17
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And this is the VS project.

Quote: "Prolly put an extern "C" in front of your prototyped function (not that I know a lot about VS)?"

No, wont work - its a C function (and code), not C++

I must admit, I'm at a loss - Depends sees the DLL as _openConsole, so it should be usable.

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Freddix
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Posted: 6th Aug 2006 12:40
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what I suggest you, is to name your procedure in PB this way :
ProcedureDLL Z_openConsoleZZYAXXZ()
Once you've compiled your DLL use a small program like XVI32 (Hex editor)
and replace the Z_openConsoleZZYAXXZ with ?Z_openConsole@@YAXXZ
it may then work in VS

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OSX Using Happy Dude
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Posted: 6th Aug 2006 13:38 Edited at: 6th Aug 2006 13:43
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Sounds like a bit of work... Would be easier to load the DLL and use GetProcAddress...

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OSX Using Happy Dude
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Posted: 6th Aug 2006 14:21
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And no nicking the code I'm doing a plug-in..;

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IanM
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Posted: 6th Aug 2006 19:14
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PB Code, make sure to include a leading underscore on the names you want to export, as per the _openConsole code in your PB example.

CPP code ... well, it's easier to show you:


It links OK, but doesn't do much when it runs (obviously!) - but most importantly, it doesn't crash.

You need to experiment by passing variables to/from the exported code, make sure you use the cdecl convention on each side ... basically test the hell out of it.

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OSX Using Happy Dude
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Posted: 6th Aug 2006 19:19
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I'll try that later - thanks.

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