Hello World!



To compile the example:

  • Launch EiffelStudio.
  • Click Add project
  • Browse to $ISE_EIFFEL\examples\wel\hello\.
  • Choose hello.ecf
  • Choose the location where the project will be compiled, by default the same directory containing the configuration file.
  • Click OK.


After you launch the sample, You should see a window displayed as illustrated above. You will have full control over the window, and the program will quit when you close the window.

Under the Hood

MAIN_WINDOW inherits WEL_FRAME_WINDOW. In this example, we have redefined on_paint as shown below: on_paint (paint_dc: WEL_PAINT_DC; invalid_rect: WEL_RECT) --Draw a centered text do paint_dc.draw_centered_text("Hello, World!", client_rect) end

Note: If you look at MAIN_WINDOW, you will see that it contains many features. However, nearly all of these are features are inherited from WEL_FRAME_WINDOW.

This sample contains the following classes:


See Also:
Tutorial Step3
Common message hooks