[nickm]

So, the default Mail Handler for a user appears to be set in com.apple.LaunchServices.plist under the key "U:mailto". Is there a way that I can change this from within my cocoa application? (Yes, I'll be asking the user's permission first). As far as I can tell, NSUserDefaults only adjusts the plist for your own app.

[Diggory Laycock]

The whole protocol thing seems to be in complete limbo at the moment -

protocol bindings should be set by Internet Config. - although some apps ignore IC (see safari)

Launch Services is Read-Only- I don;t believe that there is an API for changing the LS settings.

Hopefully Apple will sort out this whole mess soon - it's a bit like Creator codes - half there and half ignored. Leading to inconsistent behaviour by different apps.

[smeger]

You can call the CoreFoundation CFPreferences routines from within your Cocoa app to do this. Check out /Developer/Documentation/CoreFoundation/ for more info.

You could also use the terminal command 'defaults' - type 'man defaults' for more info.

[Angus_D]

Or you could use [[NSUserDefaults standardUserDefaults] persistentDomainForName:@"com.apple.LaunchServices "] -- however this may break in future releases of OS X, as relying on other apps' prefs is a bad idea