gistfile1.cs

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Linq;
using MonoTouch.Foundation;
using MonoTouch.UIKit;
using MonoTouch.ObjCRuntime;

namespace BlockTestiPad
{
	public class Application
	{
		static void Main (string[] args)
		{
			UIApplication.Main (args);
		}
	}

	// The name AppDelegate is referenced in the MainWindow.xib file.
	public unsafe partial class AppDelegate : UIApplicationDelegate
	{
		delegate void MyDelegate (IntPtr thiz, IntPtr obj, ref bool stop);
		delegate void copy_helper (IntPtr dst, IntPtr *src);
		delegate void dispose_helper (IntPtr src);

		[StructLayout (LayoutKind.Sequential)]
		struct BlockDescriptor {
			int reserved;
			public int size;
			IntPtr copy_helper;
			IntPtr dispose;
		}

		[StructLayout (LayoutKind.Sequential)]
		unsafe struct BlockLiteral {
			public IntPtr isa;
			public int flags;
			public int reserved;
			public IntPtr invoke;
			public IntPtr block_descriptor;
		}

		unsafe static IntPtr MakeInt (MyDelegate del)
		{
			var descriptor = (BlockDescriptor *) Marshal.AllocHGlobal (sizeof (BlockDescriptor));
			descriptor->size = sizeof (IntPtr) * 3 + sizeof (int) * 2;
			var block = (BlockLiteral *) Marshal.AllocHGlobal (sizeof (BlockLiteral));
			block->isa = Class.GetHandle ("__NSConcreteGlobalBlock");
			block->invoke = Marshal.GetFunctionPointerForDelegate (del);
			block->flags = 1 << 28;

			GCHandle.Alloc (del);
			return (IntPtr) block;
		}

		// This method is invoked when the application has loaded its UI and its ready to run
		public override void FinishedLaunching (UIApplication application)
		{
			try {
			Console.WriteLine ("fl");
			var s = new NSMutableSet ();
			s.Add (new NSString ("foo"));
			s.Enumerate (MakeInt (delegate (IntPtr thiz, IntPtr obj, ref bool stop)  {
				Console.WriteLine ("Got {0}", Runtime.GetNSObject (obj));
			}));

			// If you have defined a view, add it here:
			// window.AddSubview (navigationController.View);
			} catch (Exception ex) {
				Console.WriteLine (ex);
			}
			window.MakeKeyAndVisible ();
		}
	}
}