[iPhone] Getting non-Nib simple app to work

Question

Dear Experts,
I'm having trouble getting a trivial application with no Nib file to work.
One key thing is the need to pass the name of the AppDelegate class as the last parameter to UIApplicationMain(). Yet it still doesn't do anything. Here's the code:
main.m:
#import <UIKit/UIKit.h>
int main(int argc, char *argv[])
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, @"HelloWorldAppDelegate");
[pool release];
return retVal;
HelloWorldAppDelegate.h:
#import <UIKit/UIKit.h>
@interface HelloWorldAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow* window;
@end
HelloWorldAppDelegate.m:
#import "HelloWorldAppDelegate.h"
@implementation HelloWorldAppDelegate
- (void)applicationDidFinishLaunching:(UIApplication *)application {
window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
window.backgroundColor = [UIColor whiteColor];
[window makeKeyAndVisible];
- (void)dealloc {
[window release];
[super dealloc];
@end
All that that should do is create a window with a white background. When I run it in the simulator I just see a blank black background. Attempts to add other content as subviews of the window also result in nothing being visible.
I think that I must be missing some other bit of fundamental "plumbing" somewhere that would have been done for me my the nib file in a project that had one. Does anyone have any clues? Can anyone point me to some sample code that doesn't use a nib file? According to the debugger, my applicationDidFinishLaunching is being run.
Thanks in advance!
Phil.

Answer 1

Thanks for the hint; here's the code again:
main.m:
#import <UIKit/UIKit.h>
int main(int argc, char *argv[])
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, @"HelloWorldAppDelegate");
[pool release];
return retVal;
HelloWorldAppDelegate.h:
#import <UIKit/UIKit.h>
@interface HelloWorldAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow* window;
@end
HelloWorldAppDelegate.m
#import "HelloWorldAppDelegate.h"
@implementation HelloWorldAppDelegate
- (void)applicationDidFinishLaunching:(UIApplication *)application {
window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
window.backgroundColor = [UIColor whiteColor];
[window makeKeyAndVisible];
- (void)dealloc {
[window release];
[super dealloc];
@end