how can i get the text of entry in TK? - RUBY

On 11ÔÂ7ÈÕ, ÏÂÎç2ʱ08·Ö, slaughter <fz...@hotmail.com> wrote:
> hi everyone!
> I want to get the text of entry in TK,when run the script,I input
> the value "test" in the entry,but click the button "get",It just show
> the value "Null",not the value "test" which is except.
> what is the wrong? the script is as below:
>
> require 'tk'
>
> root=TkRoot.new{
> title "getValue"
> }
>
> var=TkVariable.new
> a=TkEntry.new(root){
> text=var
> grid 'row'=>1,'column'=>1
>
> }
>
> TkButton.new(root){
> text "get"
> grid 'row'=>3,'column'=>1
> command{
> puts a.cget('text')
>
> }
>
> }
>
> Tk.mainloop


I have resolve as this


> require 'tk'
>
> root=TkRoot.new{
> title "getValue"
> }
>
> var=TkVariable.new
> a=TkEntry.new(root){
> grid 'row'=>1,'column'=>1
> }

a.textvariable=var

> TkButton.new(root){
> text "get"
> grid 'row'=>3,'column'=>1
> command{
> puts a.cget('textvariable')
>
> }
>
> }
>
> Tk.mainloop

slaughter wrote:
> hi everyone!
> I want to get the text of entry in TK,when run the script,I input
> the value "test" in the entry,but click the button "get",It just show
> the value "Null",not the value "test" which is except.
> what is the wrong? the script is as below:
>
> require 'tk'
>
> root=TkRoot.new{
> title "getValue"
> }
>
> var=TkVariable.new
> a=TkEntry.new(root){
> text=var
> grid 'row'=>1,'column'=>1
> }
>
> TkButton.new(root){
> text "get"
> grid 'row'=>3,'column'=>1
> command{
> puts a.cget('text')
>
> }
> }
>
> Tk.mainloop
>
>
>


Here is a working example.

http://ruby.about.com/od/tk/ss/widgets_6.htm

You used the method cget, I believe the correct method is value.