Obtaining the index of value from an array of strings or an array of structures.

    

static char *options[] = {
        "-opt1", "-opt2", "-opt3",NULL
    };
static enum  optsIdx {
    opt1Idx, opt2Idx, opt3Idx
    }; 

gint idx;

/* obtain idx from an array of strings */
Tcl_GetIndexFromObj ( interp, objv[1], options, "option", TCL_EXACT, &idx );


/* obtain idx from array of structures, not an array of strings */
Tcl_GetIndexFromObjStruct ( interp, objv[1], ( char ** ) &commands[0].cmdName, sizeof ( GnoclCommand ), "command", TCL_EXACT, &idx );