Import and C++

[Polo]

Hi !

Can we import C++ functions with the "Import" feature of Purebasic (I use VC++ express) ?

What syntax should we use for exporting the functions ?

cheers,
Polo

[Fred]

You will have to put 'extern "C"' before the function you want to export and it should be ok.

[Polo]

This is what I'm doing
When I compile the code with import, the linker hang

I'm pretty sure this is just me doing something wrong with visual C++ express, but I can't figure out what

Here's a quick example to show you what the problem is :

http://dl.free.fr/nopKQCTV1/test.rar

thanks

[milan1612]

I created a new project with VS2008 and compiled this code to a static library:

Code: Select all

extern "C" {
	int get()
	{
		return 1;
	}
};

The Purebasic Linker doesn't find the function, even when I import it like this

Code: Select all

Import "Release/testlib.lib"
  get.l() As "get"
EndImport

it won't work

[Polo]

Yes this is exactly the problem I have
Is that a bug ?

[srod]

Will you not need to use ImportC with that lib?

[Polo]

Will you not need to use ImportC with that lib?

No I'm afraid it doesn't change anything, as I'm using _stdcall

[milan1612]

Will you not need to use ImportC with that lib?

Doesn't change anything, I already tried that before

[srod]

What about :

Code: Select all

ImportC "Release/testlib.lib" 
  get.l() As "_get" 
EndImport

[DoubleDutch]

VS2008

Don't forget that VS2008 doesn't write code that will run on Win9x!
(I know that this isn't the cause of the problem, but its worth considering if your coding a lib and would like it to run on Win9x machines).

[Polo]

What about :

Code: Select all

ImportC "Release/testlib.lib" 
  get.l() As "_get" 
EndImport

It unfortunately doesn't change anything, as the linker just crash

[milan1612]

@srod
Sorry, no change, it simply doesn't find the function and outputs this:

PureBasic - Linker error
POLINK: fatal error: Corrupt library: 'C:\Dokumente und Einstellungen\Milan\Eigene Dateien\testlib\Release\testlib.lib'; unable to find symbol '_get' in member '.\Release\testlib.obj'.

@DoubleDutch
I'm aware of this, thanks anyway...

[Fred]

May be you can try with the lastest polink version (found in the pellesc package).

[srod]

Aye, my next suggestion was to perhaps look for a more up to date version of Polink.

[milan1612]

OK, downloaded and replaced the new polink.exe, but the error persists