Question

I want to use a command-line with a argument to call my cocoa app , but in my cocoa app ,how to receive the argument , this argument is a file path, thank you very much!

Answer 1

Neat thing: use NSUserDefaults.

If you do:

./MyCocoaApp -argument /path/to/file.txt

Then in your code you can do:

NSDictionary * arguments = [[NSUserDefaults standardUserDefaults] volatileDomainForName:NSArgumentDomain];
NSString * path = [arguments objectForKey:@"argument"];

The key is the -argument switch, and the value is the thing that comes after it. Note that this isn’t very flexible (you can’t do combine options: -a -l ≠ -al), but for rudimentary arguments, this is dead simple.

edit with multiple arguments:

./MyCocoaApp -arg1 42 -arg2 "Hello, world!" -arg3 /path/to/file.txt

And then extract via:

... = [arguments objectForKey:@"arg1"];
... = [arguments objectForKey:@"arg2"];
... = [arguments objectForKey:@"arg3"];