"Hello world" with a GUI
Using the APL's built in GUI interface we can build a Hello world form.
HelloWorld;ref;btn;myFnt ⍝ Build up a GUI and display "Hello world" in a button on a Form ref←⎕NEW⊂'Form' ⍝ Create a form with default parameters ref.Caption←'Hello World with APL' ⍝ Set the caption ref.Coord←'Pixel' ⍝ Deal with pixels myFnt←⎕NEW⊂'Font' ⍝ Create a font myFnt.Pname←'Arial Black' ⍝ Which one myFnt.Size←48 ⍝ Setting the font size btn←ref.⎕NEW⊂'Button' ⍝ Create a button btn.Caption←'Hello World' ⍝ Set the caption of the button btn.Posn←0 0 ⍝ Set the position of the button btn.Size←ref.Size ⍝ Make the button the same size as the form btn.FontObj←myFnt ⍝ Associated the font with the button btn.onSelect←1 ⍝ Interrupt when button is pressed ⎕DQ'.' ⍝ Give control to the user
Setting the system variable (⎕LX) to 'HelloWorld' and saving the workspace ensures that this code is executed automatically when our program is loaded.
This program will result in this form:
To make our program runnable we can select the File|Export menu command to make a bound executable whose name we can type into the Run... dialog.
Page created by Phil Last in 2008-02-26