[vtkusers] Help with tcl interpreter

[Robert Belleman]

Johanna,

Here's an example: the following C code should be all you need
to create a simple Tcl interpreter that executes a script from
a file (given by the first argument):

--------------------------------------------------------------------
#include <tcl.h>

int main(int argc, char *argv[])
{
  Tcl_Interp *tclinterp = Tcl_CreateInterp();

  if (Tcl_EvalFile(tclinterp, argv[1]) != TCL_OK)
    fprintf(stderr, "Error: %s\n", tclinterp->result);

  return 0;
}
--------------------------------------------------------------------

Feed this program the script below to get a Vtk cone:

--------------------------------------------------------------------
set tcl_library "/usr/lib/tcl8.3"
source $tcl_library/init.tcl

load libtk
load libvtkCommonTCL
load libvtkGraphicsTCL
load libvtkRenderingTCL

vtkRenderer ren1
vtkRenderWindow renWin
  renWin AddRenderer ren1
vtkRenderWindowInteractor iren
  iren SetRenderWindow renWin

vtkConeSource cone
vtkPolyDataMapper coneMapper
  coneMapper SetInput [cone GetOutput]
vtkActor coneActor
  coneActor SetMapper coneMapper

wm withdraw .
ren1 AddActor coneActor
iren Initialize
iren Start
--------------------------------------------------------------------

Hope that solves your problem,
best,
-- Rob

-- 
[] Robert Belleman, PhD    X  Faculty of Science, Informatics Inst.    []
[] robbel at science.uva.nl  |X| University of Amsterdam, the Netherlands []
[] tel: (+31) 20 525 7510  X  http://www.science.uva.nl/~robbel/       []

On Tue, Jul 29, 2003 at 03:52:06PM +0200, Johanna wrote:
> This is part of my code and the result:
> 
> Code:
>   Tcl_Interp *tclinterp;
>   tclinterp = Tcl_CreateInterp();
> 
>   eval=Tcl_GlobalEval(tclinterp,"info library");
> 
>   if (tclinterp->result != 0) { 
>     printf("Test [%s]\n", tclinterp->result);
>   }
> 
>   if (eval==TCL_ERROR) {
>     printf("eval=[%d]\n", eval);
>     return TCL_ERROR;
>   }
> 
> Result/Output:
>   Test [no library has been specified for Tcl]
> 
> So I guess my libraries are not loaded ok. However I still get a TCL_ERROR from Tcl_GlobalEval so it seems that not even the line 'Tcl_GlobalEval(tclinterp,"info library")' is ok. 
> 
> I tried to do 'Tcl_EvalFile(tclinterp, "/usr/lib/tcl8.3/init.tcl")' but since all Tcl_EvalFile, Tcl_GlobalEval etc generates a TCL_ERROR I do not think it worked.
> 
> /Johanna
> 
> -----Original Message-----
> From: "shahid" <shahed at isb.paknet.com.pk>
> To: <vtkusers at vtk.org>
> Date: Tue, 29 Jul 2003 17:24:38 +0500 
> Subject: RE: [vtkusers] Help with tcl interpreter
> 
> 
> You probably need to first check that you Interp process is initialized
> properly
> 	code=Tcl_Eval(tclinterp,"info library"); # returned path must include path
> to vtk files
>                                                #else "package require vtk"
> shall fail
> doing
> 	Tcl_EvalFile(tclinterp, "your_tcllibpath/init.tcl"); # may help to
> initialize the interpreter properly
> 
> Hope this shall solve your problem.
> 
> shahed
> 
> -----Original Message-----
> From: vtkusers-admin at vtk.org [mailto:vtkusers-admin at vtk.org]On Behalf Of
> Johanna
> Sent: Tuesday, July 29, 2003 12:38 PM
> To: vtkusers at vtk.org
> Subject: [vtkusers] Help with tcl interpreter
> 
> 
> Hello
> 
> I am trying to use Tcl_Interp and Tcl_EvalFile to evaluate a tcl script from
> a c++ file. My code looks like this:
> 
> Tcl_Interp *tclinterp;
> tclinterp = Tcl_CreateInterp();
> 
> int code = Tcl_EvalFile(tclinterp, "myTclScript.tcl");
> 
> if (code!=TCL_OK) {
>   return TCL_ERROR;
> }
> 
> The problem is that Tcl_EvalFile is never TCL_OK and always returns an
> error, i.e. myTclScript.tcl can not be evaluated. When my tcl script has
> been run by the interpreter I would like to access some actors generated in
> the tcl script.
> 
> Does anyone have any experience on this and can see what I am doing wrong?
> 
> Sincerely
> Johanna
> 
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> 
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