From: John Feminella <johnf@...>
Date: 2011-09-09T07:26:39+09:00
Subject: Re: undefined method??

I am not sure what this is, exactly, but you've written your callbacks as:

>    b1=TkButton.new(top) {text 'MSG' ;command {MyForm.domsg} ;pack ph}
>    b2=TkButton.new(top) {text 'EXIT';command {MyForm.doexit};pack ph}

Note that you wrote "MyForm.domsg". This says, "invoke the #domsg
method from the MyForm class". However, you've defined #domsg as an
instance method, not a class method, so Ruby is right: #domsg is
undefined on the MyForm class.

~ jf
--
John Feminella
Principal Consultant, BitsBuilder
LI: http://www.linkedin.com/in/johnxf
SO: http://stackoverflow.com/users/75170/



On Thu, Sep 8, 2011 at 17:18, Joe Collins <joec_49@hotmail.com> wrote:
> When I press MSG or EXIT buttons I get undefined method errrs for the
> programs domsg and doexit respectively. They are public methods so they
> should be quite visible. Code follows - pls tell what I am doing wrong.
> thanks in advance.
>
> Joe
>
> class MyForm
>  def domsg
>     puts "domsg called"
>     lbl.configure("text"=>"Goodbye cruel world\nGoing down real soon")
>     t=Time.now.asctime
>     t=t.split(" ")
>     puts t[0]+" "+t[1]+" "+t[2]+" "+t[3]
>  end
>  def doexit
>     puts "doexit called"
>     t=Time.now.asctime
>     t=t.split(" ")
>     puts t[0]+" "+t[1]+" "+t[2]+" "+t[3]
>     puts "....going down!.....crash!"
>     exit
>  end
>  def initialize
>    ph= {'padx' =>10, 'pady' =>10}
>    root=TkRoot.new { title "NEAT!" }
>    @variable1 = TkVariable.new
>    @variable2 = TkVariable.new
>    top = TkFrame.new{root;(height 250;width 250)}
>    lbl=Tk::Tile::Label.new(top) {
>      text 'Hello World! This is really neat stuff!'
>    }
>    lbl.place('height' =>35,
>      'width'  =>200,
>      'x'      =>35,
>      'y'      =>65
>    )
>    @entry1=TkEntry.new{top;textvariable @variable1; pack(ph)}
>    @entry1.place('height' => 25,
>              'width'  => 150,
>              'x'      => 10,
>              'y'      => 10)
>    @entry1.pack(ph)
>    @entry2=TkEntry.new{top;textvariable @variable2; pack(ph)}
>    @entry2.place('height' => 25,
>            'width'  => 150,
>            'x'      => 10,
>            'y'      => 40)
>    @entry2.pack(ph)
>    b1=TkButton.new(top) {text 'MSG' ;command {MyForm.domsg} ;pack ph}
>    b1.place('height' =>25,
>          'width'  =>100,
>          'x'      =>50,
>    'y'     =>100)
>    b2=TkButton.new(top) {text 'EXIT';command {MyForm.doexit};pack ph}
>    b2.place('height' =>25,
>          'width'  =>100,
>          'x'      =>50,
>    'y'     =>150)
>    top.pack('fill'=>'both', 'side' =>'top')
>    end
> end
> MyForm.new
> tk.mainloop
>
> --
> Posted via http://www.ruby-forum.com/.
>
>