cocoa sample for showing statusbar

statusbar.m

/*
 * statusbar.m
 *   sample for showing something to status-bar
 *
 * How to compile and run.
 *  $ gcc statusbar.m -framework Cocoa
 *  $ ./a.out
 */
#import <Cocoa/Cocoa.h>

@interface StatusBar : NSObject {
  NSStatusItem* item;
}
- (void)sayHello;
@end
@implementation StatusBar
- (id)init
{
  if ( (self = [super init]) ) {
    NSStatusBar* bar = [NSStatusBar systemStatusBar];

    item = [[bar statusItemWithLength:NSVariableStatusItemLength] retain];

    [item setTitle:@"title"];
    [item setToolTip:@"tooltip"];
    [item setHighlightMode:YES];

    NSMenu* menu = [[[NSMenu alloc] initWithTitle:@"Menu"] autorelease];
    NSMenuItem* menuItem = [[[NSMenuItem alloc] initWithTitle:@"MenuItem"
                                                       action:@selector(sayHello)
                                                keyEquivalent:@""] autorelease];
    [menuItem setTarget:self];
    [menu addItem:menuItem];

    [item setMenu:menu];
  }
  return self;
}

- (void)dealloc
{
  [item release];
  [super dealloc];
}

- (void)sayHello
{
  NSLog(@"Hello");
}
@end

int main(int argc, char** argv)
{
  NSAutoreleasePool* pool;
  pool = [[NSAutoreleasePool alloc] init];

  [NSApplication sharedApplication];
  StatusBar* bar = [[[StatusBar alloc] init] autorelease];
  [NSApp run];

  [pool drain];
  return 0;
}