Hi Rudiger,
When you call ProcessLine in this way, you must tell CINT the data type
of the arguments via a cast before the hexadecimal address.
You can see examples in $ROOTSYS/gpad/src/TPad.cxx, eg:
gROOT->ProcessLine(Form("((TPad *)0x%lx)->CreateNewText(%d,%d,%d,%d);",
gROOT->ProcessLine(Form("((TPad *)0x%lx)->CreateNewPave(%d,%d,%d,%d);",
gROOT->ProcessLine(Form("((TPadView3D
*)0x%lx)->PaintBeginModel();",(Long_t)fPadView3D)
gROOT->ProcessLine(Form("((TPadView3D
*)0x%lx)->PaintEnd();",(Long_t)fPadView3D));
gROOT->ProcessLine(Form("((TPadView3D
*)0x%lx)->PaintScene();",(Long_t)fPadView3D));
On
Thu, 12 Jun 2003, Rüdiger Berlich wrote:
> Hi there,
>
> I'm trying to embed root into a C++ application in the following way:
> In the constructor of a class I call
>
> myInterpreter = new TRint("ROOT population", NULL, NULL);
>
> myInterpreter is defined as TRint * in the same class. A function of that
> class is then supposed to repeatedly execute root scripts like this :
>
> gROOT->ProcessLine(Form(".x
> %s(%p,%d,%p)",rootScript.c_str(),values,size_this,&result),&error);
>
> "values" is a double array of size size_this, result is a double. I'm using
> the following example script, it is stored in a file parabola.cc (the same
> name is stored in the string "rootScript", see above).
>
> void parabola(double *values, int nValues, double *result)
> {
> int i;
>
> *result=0;
> for(i=0; i<nValues; i++)
> *result += values[i]*values[i];
> }
>
> Executing my application results in the following error message :
>
> [...]
> CINT/ROOT C/C++ Interpreter version 5.15.74, Feb 2 2003
> Type ? for help. Commands must be C++ statements.
> Enclose multiple statements between { }.
> Error: Function parabola(0xbfffd8d0,2,0xbfffda38) is not defined in current
> scope FILE: LINE:0
> Possible candidates are...
> filename line:size busy function type and name
> parabola.cc 1:8 0 public: void parabola(double* values,int
> nValues,double* result);
> [...]
>
> If I do the same directly in root, namely :
>
> root [0] double values[2]={2.,2.};
> root [1] double result;
> root [2] int size_this = 2;
> root [3] .x parabola.cc(values,size_this,&result);
> root [4] cout << result << endl;
> 8
>
> I get back the correct result.
>
> Any help is appreciated !
>
> Have a nice day,
> Ruediger Berlich
>
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