GNUStep：create our first gui application

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本文介绍如何使用GNUstep框架创建一个简单的GUI应用程序，包括菜单设计和窗口启动流程。

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1. MyApp.m

#include <Foundation/Foundation.h>
#include <AppKit/AppKit.h>

@interface MyDelegate : NSObject
- (void) printHello: (id)sender;
- (void) applicationWillFinishLaunching: (NSNotification *)not;
@end

@implementation MyDelegate : NSObject 
- (void) printHello: (id)sender
{
  //printf ("Hello!\n");
  //NSLog(@"Hello!\n");
  NSRunAlertPanel (@"Test", @"Hello from the GNUstep AppKit", 
                   nil, nil, nil);
}

- (void) applicationWillFinishLaunching: (NSNotification *)not
{
	NSMenu *menu;

	menu = AUTORELEASE ([NSMenu new]);
	[menu addItemWithTitle: @"Print Hello"  
		action: @selector (printHello:)  
		keyEquivalent: @""];
		
		NSMenu *infoMenu;

	infoMenu = AUTORELEASE ([NSMenu new]);
	[infoMenu addItemWithTitle: @"Info Panel..." 
		  action: @selector (orderFrontStandardInfoPanel:) 
		  keyEquivalent: @""];
	[infoMenu addItemWithTitle: @"Help..." 
		  action: @selector (orderFrontHelpPanel:)
		  keyEquivalent: @"?"];
		  
	NSMenuItem *menuItem;

	menuItem = [menu addItemWithTitle: @"Info..." 
			 action: NULL 
			 keyEquivalent: @""];
	[menu setSubmenu: infoMenu  forItem: menuItem];
	[menu addItemWithTitle: @"Quit"  
		action: @selector (terminate:)  
		keyEquivalent: @"q"];
		
	
		  
	[NSApp setMainMenu: menu];
}
@end

int main (int argc, const char **argv)
{ 
  [NSApplication sharedApplication];
  [NSApp setDelegate: [MyDelegate new]];

  return NSApplicationMain (argc, argv);
}

2. GNUmakefile

include $(GNUSTEP_MAKEFILES)/common.make

APP_NAME = MyFirstApp
MyFirstApp_OBJC_FILES = MyApp.m 

# Uncomment the following if you have an icon
#MyFirstApp_APPLICATION_ICON = MyApp.png
#MyFirstApp_RESOURCE_FILES = MyApp.png

include $(GNUSTEP_MAKEFILES)/application.make

3.MyFirstAppInfo.plist

{
  ApplicationName = "My First Application";
  ApplicationDescription = "An Example of how to use NSMenu";
  ApplicationRelease = "0.1";
  Authors = ("Your Name Here <your.name@your.domain>", 
             "Another Name Here <another.name@another.domain>");
  Copyright = 
    "Copyright (c) 2008 Your Name Here <your.name@your.domain>";
  CopyrightDescription = 
    "This program is released under the GNU GPL";
}

参考： http://www.gnustep.it/nicola/Tutorials/FirstGUIApplication/node11.html