TK_GetVar - Get a tcl/tk variable value
When tcl/tk support is enabled in scilab, this routine can be used to retreive the value of a tcl/tk variable.
TK_EvalStr('toplevel .tst1');
// creates a toplevel TK window.
TK_EvalStr('entry .tst1.e -textvariable tvar');
// create an editable entry
TK_EvalStr('set tvar foobar');
// set the entry value
TK_EvalStr('pack .tst1.e');
// pack the entry widget. It appears on the screen.
text=TK_GetVar('tvar')
// retrieve the variable value
// change the entry text and repeat the last command ...