Shutdown Mac Objective C

I need to be able to implement methods of:

• Shutdown
• Restart
• Logoff
• Sleep

On a Mac, I am using X开发者_运维知识库Code but can't seem to figure out the code to perform these actions.

Can anyone help me out here?

Thanks

A trivial/lazy way do this is via some simple inline Applescript:

NSString *scriptAction = @"restart"; // @"restart"/@"shut down"/@"sleep"/@"log out"
NSString *scriptSource = [NSString stringWithFormat:@"tell application \"Finder\" to %@", scriptAction];
NSAppleScript *appleScript = [[NSAppleScript alloc] initWithSource:scriptSource];
NSDictionary *errDict = nil;
if (![appleScript executeAndReturnError:&errDict]) {
    NSLog(@"%@", errDict); 
}