Processing 1.0 - Processing Discourse - Graceful exit from an exported application?

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Index › Programming Questions & Help › Syntax Questions › Graceful exit from an exported application

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Graceful exit from an exported application? (Read 1992 times)

John R Conrad

Graceful exit from an exported application?
May 27^th, 2010, 9:22am

Is there a way to circumvent the automatic closing of an exported "application.macosx" or "application.windows". I would like to force the user to have the option of saving to file (using saveStrings() ) before exiting the application. In my code I provide for this, but if the user simply clicks the "close button" in the top left-hand corner of the window, all is lost.

Is there a way to intecept that closing, so that I can prompt the user?

ben_hem Senior Member Offline Posts: 399 CA, US	Re: Graceful exit from an exported application? Reply #1 - May 28^th, 2010, 6:31am I think you can achieve this with a custom stop() function. You just need to include super.stop(); at some point to actually end the program.

Smitty

Re: Graceful exit from an exported application?
Reply #2 - May 28^th, 2010, 6:55am

I was curious about this, so I tried it myself:

Quote:

void setup() {
  size(200, 200);
}

void draw() {
  background(0);
}

void stop() {
  String savePath = selectOutput();
  super.stop();
}

When I run this from the PDE, clicking on the window's close widget generates a save prompt, as it should. But when I export it to an application, it closes without a save prompt.

blindfish God Member Offline Posts: 793	Re: Graceful exit from an exported application? Reply #3 - May 28^th, 2010, 7:59am I believe this is something of a FAQ. IIRC the issue is that to interrupt the 'close' button on an exported app you need to do things at the OS level; and that's where things become less straightforward. Probably worth searching the forums for a more comprehensive answer.
	Where is the what if the what is in why?

ben_hem Senior Member Offline Posts: 399 CA, US	Re: Graceful exit from an exported application? Reply #4 - May 28^th, 2010, 11:38am what blindfish said. You need to use noLoop() and loop() around your output selection dialog, e.g. : Code: noLoop(); String savePath=selectOutput() + ".png"; if(savePath!=null) save(savePath); loop();

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: Graceful exit from an exported application? Reply #5 - May 28^th, 2010, 11:51am @ben_hem: I don't think that's necessary, Processing takes care of such problems for the functions it provides. The trick is necessary to use JFileChooser, thought (or other Swing dialogs, like the color chooser).

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