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macrumors newbie
Original poster
Jan 6, 2015
I'm collecting a string value in a method of my app, and as it closes, I need to pass the value back to the top level main. The reason for this is because I need to spawn a thread in a manner that can only be done from main.

Is there a way to do this? Since I am calling NSAplicationMain immediately, there doesn't seem to be a way to access the class representing my program from there.


macrumors 6502a
Jan 25, 2008
Seems like you need to learn the basics of Cocoa

A method can return an NSString, so a method called from main ( or applicationDidFinishLaunching: or whereever ) could use the returned string. Some consideration will be required for retention of the string ( and the use ( or not ) of ARC is a consideration too )

If you post code it will be much easier to respond instead of guessing how ( and from where ) the method is called. Programming requires effort and that includes providing information in posts. Otherwise it's GIGO.

-(NSString *)methodThatCollectsStringValue {
    NSString *someString = blah_blah; // do "collection" of string here. Need to consider string retention.
    return someString;
Last edited:


Jan 23, 2010
San Diego, CA USA
Put a global variable in the main file. Declare an external global variable in your file where you want to write the variable. This is basic C.

I assume this would work, but I haven't tried it.


macrumors newbie
Original poster
Jan 6, 2015
Thanks for the replies, guys!

I did find a solution to this, but unfortunately neither of those ones would work for me. The string is passed to a delegate class, and the NSAplicationMain() method abstracts away my ability to directly call the program's active class directly.

What I ended up doing was making a two pass system, where the first pass runs a cocoa program whose only purpose is to collect the value of the double clicked file, then starts the second executable, passing the collected values and killing itself.
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