Hi,
Unfortunately I am aware of this problem: when you are trying to
incorporate some external global function from the shared library ROOT
sometimes crumbles its arguments. I think this is the problem of
incompatibily of some CINT and native data types or the way of schema
evolution works (it is only my opinion).
The only solution I know is to put the global function into the same
file where it is used, i.e. where TMinuit::SetFCN is called, and DON'T
generate any dictionary for it. It is also important to declare this
function 'extern'. For example you can refer to minuit/src/TFitter.cxx
source.
Best regards,
Stanislav.
On Thu, 26 Jun 2003, Pierre-Luc Drouin wrote:
> Hi,
>
> Now I can call the function from the interpreter, but the pointers that
> are passed to the function
> are not passed correctly. This function is a minimization function for
> TMinuit, so it has the format:
>
> void (*)(Int_t&, Double_t*, Double_t&f, Double_t*, Int_t)
>
> The problem I have is with the fourth parameter. TMinuit Eval function
> pass a valid address when it calls the function, but in the function
> implementation, the address read for the fourth parameter is wrong
> (0xa) and it causes a segmentation fault. Actually, my LinkDef.h for this
> function is
>
> ifdef __CINT__
> #pragma link off all globals;
> #pragma link off all classes;
> #pragma link off all functions;
>
> #pragma link C++ function QExtendedLikelihood;
> #endif
>
> and I produce the corresponding dictionnary file using command:
> rootcint -f QExtendedLikelihoodDict.cxx -c QExtendedLikelihood.h LinkDef.h
>
> Thanks
>
> Pierre-Luc Drouin
>
> On Thu, 26 Jun 2003, Stanislav Nesterov wrote:
>
> > Hi,
> >
> > In this case when generating dictionary add to the LinkDef.h file:
> >
> > #pragma link C++ function MyFunction;
> >
> > And then proceed as usual, i.e. compiling dictionary, linking, etc.
> >
> > Best regards,
> > Stanislav.
> > On Thu, 26 Jun 2003, Pierre-Luc Drouin wrote:
> >
> > > Hi,
> > >
> > > I've a function (not a class member function) that I want to be able to
> > > call from the ROOT interpreter. I want a compiled function contained in a
> > > share library. I'm used to include my classes using
> > > rootcint and ClassDef, ClassImp statements in my code, but with C style
> > > functions, I don't really know how to proceed. Suppose my function header
> > > file is
> > >
> > > =====MyFunction.h====
> > > #include <cstdio>
> > > void MyFunction();
> > >
> > > and the source file is
> > >
> > > ====MyFunction.cxx===
> > > #include "MyFunction.h"
> > > void Myfunction(){
> > > printf("Hello Wolrd\n");
> > > }
> > >
> > > What should I do if I want to be able to call MyFunction from the
> > > interpreter, if the function is compiled in a shared library?
> > >
> > > Thanks
> > >
> > > Pierre-Luc Drouin
> > >
> > >
> >
>
>
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