Am 25.06.2005 um 12:50 schrieb Himanshu Garg:

> Hello,
>
>     I have a function fnTest which is written in a MS Windows DLL. It
> works fine when I call it from another exe. When I call it from my
> subclass of Object in the following method I get externalCallFailed
> error.
> ---------------------------------------------------------------------
> go
>        "Call fnTest from PangoDll"
>
>        <apicall: void 'fnTest' (void) module:'pangodll.dll'>
>        ^super externalCallFailed
> ---------------------------------------------------------------------


Make sure there is no name mangling going on. 'fnTest' has to be the  
*exact* name found in the library file. If, for example, the library  
actually contains the symbol '_fnTest' then you'ld have to use that.

If you use C++, make sure to put the function in your headers inside  
'extern "C" {...}'. Here is a mini-howto on that (Squeak FFI uses the  
dlopen/dlsym scheme described there, but from C, not from C++):

     http://www.linuxdownloads.org/minihowto/C++-dlopen.html

Also, it could be that a header file redefines the function name so  
that it appears differently in the library than in the source code  
(this happens a lot with Windows functions on strings, which  
generally have an A or W appended by some macro magic).

- Bert -