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Changing a Dock preference

My app is a Dock-style launcher thingy and as such, I want a preference in
it which allows the user to turn on the Dock's Auto-hiding without having to
get them to do it manually via the Dock's own preferences.

After much poking around, I came up with this:

CAutoCFString_AC key("autohide");
CAutoCFString_AC theDock("com.apple.dock");
CFBooleanRef val = hideDock_i ? kCFBooleanTrue : kCFBooleanFalse;
CFPreferencesSetValue(key, val, theDock, kCFPreferencesCurrentUser,
kCFPreferencesAnyHost);
CFPreferencesAppSynchronize(theDock);

CFNotificationCenterRef center = CFNotificationCenterGetDistributedCenter();
CFStringRef observedObject = CFSTR("com.apple.dock");

CFNotificationCenterPostNotification (center,
CFSTR("com.apple.dock.prefchanged"),
observedObject,
nil, true);


But alas it does not work.

Anyone got any ideas why it doesn't work, or if their is a better way?

Matt Gough
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