program that downloads and launches another? in a bundle?

[dieselnutjob]

I have been playing with a concept whereby a small program (a sort of loader I suppose) can:-

Check if another program exists.
Check for latest md5 on a website.
Compare with the one on disk.
If different delete and download the new one.
Launch it and exit.
I got this working with Windows and Linux but I'm struggling a bit with Mac OSX.

On Windows and Linux the launcher doesn't have a form, but it also works just as well with a form that's hidden.

With MacOSX if I run the programs in a normal directory the second program runs but the user cannot interact with it (you can't click on anything).

If I compile the second program and put it into the bundle it runs and works, but, if I change it's name and put the launcher in there with the second program's original name, then clicking on the 2ndprogram.app icon doesn't run it.

Can you have two executables in a bundle with one that runs the other?  Is there a better way to do this?

thanks, Philip

[dieselnutjob]

The partial answer to my question is here
http://wiki.freepascal.org/Executing_External_Programs#OS_X_show_application_bundle_in_foreground

However this only shows how to execute a program in another bundle, not how to have two in the same bundle.

I guess that I will have to figure out how to download and unpack a bundle programatically and then I will be able to launch it.

[jwdietrich]

You might use the trick described in http://wiki.freepascal.org/OS_X_Programming_Tips#How_to_obtain_the_path_to_the_Bundle to get the path to your bundle and then proceed as above.