# TCL_EvalStr

Evaluate a string whithin the Tcl/Tk interpreter

## Calling Sequence

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

## Arguments

str

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

interp

  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.

res

  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

## Description

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: http://www.tcl.tk/doc/

## Examples

    //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(text);
    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_CreateSlave('TCLSlave');
    TCL_EvalStr('set test ""in Slave TCL Interp""','TCLSlave');
    TCL_GetVar('test','TCLSlave')

    TCL_DeleteInterp('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_EvalFile
- TCL_GetVar
- TCL_SetVar
- TCL_ExistVar
- TCL_UnsetVar
- TCL_UpVar