[fpc-pascal] windows.GetProcAddress() vs DynLibs.GetProcAddress()

[Fred van Stappen]

On Mon, 13 Jan 2014, Fred van Stappen wrote:
 
> 
> On Mon, 13 Jan 2014, Fred van Stappen wrote:
>
> 
> > > > begin
> > > > LibHandle:=DynLibs.LoadLibrary(libfilename);
> > > >   if LibHandle <> DynLibs.NilHandle then
> > > >    
> > > >     Pointer(soundtouch_createInstance)        := DynLibs.GetProcedureAddress(LibHandle, PAnsiChar('soundtouch_createInstan
> ce
> > '));
> > > 
> > > Remove the typecast PansiChar()
> > > 
> > > Michael.
> > > >> Hello Michael and thanks for answer.
> > > But if i remove PansiChar(), i still get :
> > > An unhandled exception occurred at $0000000000000000:
> > > EAccessViolation: Access violation
> > >   $0000000000000000
> > 
> > What is the value of  Pointer(soundtouch_createInstance) after the above statement ? Is it nil ?
> > 
> > Michael.
> > Thanks for answer Michael.
> > 
> > Hum, how can i get the value of pointer if the application crash when i do :
> > 
> > >>  FHandle := soundtouch_createInstance();  
> 
> Do a
> 
> Writeln((@soundtouch_createInstance)=Nil);
> 
> Michael.
> ___________
> Thanks Michael.
> Result in Linux for :
> if ST_Load('/home/fred/libSoundTouch/libSoundTouch.so')
>   then   writeln('ok') else  writeln('no') ;
> >> ok
> Writeln((@soundtouch_createInstance)=Nil);
> >> FALSE
> I agree it is very strange, in windows, with unit Windows, it works perfectly..
 
Wait.
 
What happens if you use dynlibs on windows ?
 
Because there can be 1000 other reasons why the load failed on linux, 
not necessarily connected to dynlibs.
 
Michael.
____________________________________________

Yep, Michael, many thanks for helping.

>> What happens if you use dynlibs on windows ?

Exactly the same as for Linux, it crash.

What i do not understand it is why, with Windows unit, it works perfectly and with Dynlibs unit, it crash. (with same code, of course).


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