Home/ Questions/Q 9253683
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-18T11:16:50+00:00

When using Tcl C++ API Tcl_Eval , if it returns TCL_ERROR , the error

  • 0

When using Tcl C++ API Tcl_Eval, if it returns TCL_ERROR, the error message can be retrieved from Tcl_GetStringResult(interp). However, when executing a bunch of tcl script, the error message doesn’t indicate which line the script fails.

Eg:

can't find package foobar
    while executing
"package require foobar"
    (file "./test.tn" line 5)

Tcl_GetStringResult(interp) doesn’t provide this information: (file "./test.tn" line 5). Is there a way to print out the call stack like in tcl interpreter so that I know which line the script fails?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    The information you are looking for, the error info (i.e., stack trace), is in the global errorInfo variable. This information may be retrieved with Tcl_GetVar or one of its related functions. One of the best to choose is Tcl_GetVar2Ex (the name being a product of a slowly evolving API) which is highly efficient:

    Tcl_Obj *infoObj = Tcl_GetVar2Ex(interp, "errorInfo", NULL, TCL_GLOBAL_ONLY);

    Then you use Tcl_GetString to extract the human-readable part as a char * (treat as const).

    • 0