Retrieve the frame of the OS X desktop as a single NSRect

NSScreen+CBAdditions.h

//
// NSScreen+CBAdditions.h
// Hyperspaces
//
// Created by Tony Arnold on 2/11/10.
// Copyright 2010 The CocoaBots. All rights reserved.
//

#import <Cocoa/Cocoa.h>

@interface NSScreen (CBAdditions)

+ (NSRect)desktopFrame;

@end

NSScreen+CBAdditions.m

//
// NSScreen+CBAdditions.m
// Hyperspaces
//
// Created by Tony Arnold on 2/11/10.
// Copyright 2010 The CocoaBots. All rights reserved.
//

#import "NSScreen+CBAdditions.h"

@implementation NSScreen (CBAdditions)

+ (NSRect)desktopFrame {
    NSArray  *screens = [NSScreen screens];
    NSRect    frame   = NSZeroRect;
    NSScreen *screen  = nil;

    if (!screens) {
        return frame;
    }

    // Menubar is the 0th screen (according to the NSScreen docs)
    NSEnumerator *e = [screens objectEnumerator];
    frame = [[screens objectAtIndex:0] frame];

    while ((screen = [e nextObject])) {
        // Union the entirety of the frame (not just the visible area)
        frame = NSUnionRect(frame, [screen frame]);
    }

    return frame;
}

@end