[Mono-devel-list] cocoa#

Patrick Beard pcbeard at mac.com
Sat Jun 19 13:12:31 EDT 2004

I know of no official Cocoa# effort. However, here's a little sample 
code I've written that might get things started. I'm still learning C# 
myself, so I don't know if there is a more direct way to get a library 
loaded, so this causes the Cocoa umbrella framework to be loaded by 
calling into NSRealMemoryAvailable().

- Patrick

using System;
using System.Reflection;
using System.Runtime.InteropServices; // for DllImport.

public class CocoaTest {
     const string libobjc = "libobjc.dylib";

     [DllImport(libobjc, EntryPoint="objc_getClass", 
     public static extern int objc_getClass(string name);

     [DllImport(libobjc, EntryPoint="sel_registerName", 
     public static extern int sel_registerName(string name);

     [DllImport(libobjc, EntryPoint="objc_msgSend")]
     public static extern int objc_msgSend(int self, int cmd);

     [DllImport(libobjc, EntryPoint="objc_msgSend", 
     public static extern int objc_msgSend(int self, int cmd, string 

     static int selector(string name) {
         return sel_registerName(name);

     const string Cocoa = 

     [DllImport(Cocoa, EntryPoint="NSRealMemoryAvailable")]
     public static extern uint NSRealMemoryAvailable();

     [DllImport(Cocoa, EntryPoint="NSLog")]
     public static extern void NSLog(int message);

     public static void Main(string[] args) {
         // Call into Cocoa to get it loaded.
         uint realMemoryAvailable = NSRealMemoryAvailable();
         Console.WriteLine("realMemoryAvailable = " + 
         // Push an autorelease pool.
         int NSAutoreleasePool = objc_getClass("NSAutoreleasePool");
         int pool = objc_msgSend(NSAutoreleasePool, selector("new"));
         // allocate an NSString.
         int NSString = objc_getClass("NSString");
         int message = objc_msgSend(NSString, 
selector("stringWithCString:"), "Hello from Cocoa!");
         objc_msgSend(pool, selector("release"));
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