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Evaluate a string within the Tcl/Tk interpreter


TCL_EvalStr(str [,interp])
res = TCL_EvalStr(str [,interp])



string or matrix of strings, contains a Tcl/Tk script in each element.


optional character string parameter. Name of the slave Tcl interpreter in which the operation has to be performed. If not provided, it defaults to the main Tcl interpreter created by Scilab.


result of the evaluation, if it is successful. This is a character string matrix giving the evaluation result for each element of the input argument str


This routine allows to evaluate Tcl/Tk instructions with the Tcl/Tk interpreter launched with Scilab (when the interp parameter is not given), or in a slave interpreter.

When Tcl/Tk support is enabled in Scilab, you can evaluate Tcl/Tk expression from Scilab interpreter. In fact, Scilab launches a main Tcl/Tk interpreter. The Scilab instruction TCL_EvalStr can be used to evaluate expressions without having to write Tcl/Tk instructions in a separated file (this capability is provided by TCL_EvalFile).

More information about Tcl/Tk:


//with one call
TCL_EvalStr(["toplevel .foo1"
             "label .foo1.l -text ""TK married Scilab !!!"""
             "pack .foo1.l"
             "button .foo1.b -text close -command {destroy .foo1}"
             "pack .foo1.b"])

//step by step (debugging)
TCL_EvalStr("toplevel .foo2");

// creates a toplevel TK window.
TCL_EvalStr("label .foo2.l -text ""TK married Scilab !!!""");

// create a static label
TCL_EvalStr("pack .foo2.l");

// pack the label widget. It appears on the screen.
text="button .foo2.b -text close -command {destroy .foo2}";
TCL_EvalStr("pack .foo2.b");

//kill the windows by program
TCL_EvalStr("destroy .foo1");
TCL_EvalStr("destroy .foo2");

//with one call, and in a slave interpreter
TCL_EvalStr('set test ""in Slave TCL Interp""','TCLSlave');


// return a result
res = TCL_EvalStr("expr 1+1")
res = TCL_EvalStr("tk_messageBox -message Hello -type okcancel")
res = TCL_EvalStr(["expr 4+5" "lsearch -all {a b c a b c} c" ; "list [list a b c] [list d e f] [list g h i]" "llength  {a b c d e}"])

See also

  • ScilabEval — tcl instruction : Evaluate a string with scilab interpreter
  • TCL_EvalFile — Reads and evaluate a tcl/tk file
  • TCL_GetVar — Get a tcl/tk variable value
  • TCL_SetVar — Set a tcl/tk variable value
  • TCL_ExistVar — Return %T if a tcl variable exists
  • TCL_UnsetVar — Remove a tcl variable
  • TCL_UpVar — Make a link from a tcl source variable to a tcl destination variable
Report an issue
<< TCL_EvalFile Tcl/Tk Interface TCL_ExistArray >>

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Last updated:
Tue Mar 07 09:29:08 CET 2023