Doug Diego

For the past couple of months, I’ve been working on an iPhone app for the social networking site: mbuzzy.com. It just went live into the App Store. Check it out: mbuzzy.app

Here’s an example to upload an image (or any data file) to a server:

- (void) uploadMediaForUserId: (NSString*) userId {
	NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithObjectsAndKeys:
								kAPIVersion, @"v",
								nil];
	// Media Name
	if( TTIsStringWithAnyText(_mediaName)){
		[parameters setObject:_mediaName forKey:@"n"];
	}

	// Media Description
	if( TTIsStringWithAnyText(_mediaDescription)){
		[parameters setObject:_mediaDescription forKey:@"d"];
	}

	// REST resource, where kMedia: @"/users/%@/media";
	NSString *resource = [NSString stringWithFormat:kMedia, userId];

	// Create the URL, where kServerURL is something like "http://www.dougdiego.com"
	NSString *url = [kServerURL stringByAppendingFormat:@"%@?%@", resource, [parameters gtm_httpArgumentsString]];
	// Resulting URL looks like: http://www.dougdiego.com/users/12345/media

	TTURLRequest* request = [TTURLRequest requestWithURL:url  delegate:self];
	request.httpMethod = @"POST"; 

	NSString * imageLocalUrl = [NSString stringWithFormat:@"documents://%@",_mediaFilename];
	NSData *imageData = UIImageJPEGRepresentation(TTIMAGE(imageLocalUrl), 0.6); 

	// Set the media file with the parameter: file
	[request addFile:imageData mimeType:@"image/jpeg"  fileName:@"file"]; 

	request.cachePolicy = TTURLRequestCachePolicyNoCache;
	request.cacheExpirationAge = TT_CACHE_EXPIRATION_AGE_NEVER;

	TTURLJSONResponse* response = [[TTURLJSONResponse alloc] init];
	request.response = response;
	TT_RELEASE_SAFELY(response);

	[request send];
}

Need to implement Swipe to delete in your Three20 project? In order to do so, I added the 3 following methods to my datasource (TTListDataSource subclass):

- (BOOL) tableView: (UITableView *)tableView canEditRowAtIndexPath:  (NSIndexPath *)indexPath {
	return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle: (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
	[tableView beginUpdates];
	if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Make sure the row is there to delete
		if([_myModel.messages count] >= indexPath.row){
            // Get the object to delete
			MyObject* myObject = [[_myModel.messages objectAtIndex:indexPath.row] retain];

           	// Remove the object, in my case this makes an API call
            [self removeObjectById: myobject.id];

            // Remove the object from the array
			[_myModel.messages removeObjectAtIndex:indexPath.row];

			// clean up
			TT_RELEASE_SAFELY(myObject);
		}
        // Delete the row from the UITableView
		[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:YES];
	}
	[tableView endUpdates];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
	return [_myModel.messages count];
}

Note: before adding the numberOfRowsInSection method, I was getting NSInternalInconsistencyException errors.

Are you releasing a flashlight app for the iPhone 4 or writing an application that use the capabilities of a certain device? Apple provides a UIKit Dictionary key called UIRequiredDeviceCapabilities for this purpose.

Apple define this key as: UIRequiredDeviceCapabilities (Array or Dictionary – iOS) lets iTunes and the App Store know which device-related features an application requires in order to run. iTunes and the mobile App Store use this list to prevent customers from installing applications on a device that does not support the listed capabilities.

You set this key in the Info.plist. Here is an example which tells the App Store that your app requires a camera flash. You can use this if your app only runs on the iPhone 4:

	<key>UIRequiredDeviceCapabilities</key>
	<array>
		<string>camera-flash</string>
	</array>

More: UIKit Keys

I recently started seeing this error in my Cocos 2d iPhone application running on iOS 4.1:

sgx error (background gpu access not permitted):
Program received signal: “SIGABRT”.


After searching around, I found this thread on the cocos2d forum.

I modified my code in the ApplicationDelegate to look like:

- (void)applicationDidEnterBackground:(UIApplication *)application
{
	[[CCDirector sharedDirector] stopAnimation];
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
	[[CCDirector sharedDirector] startAnimation];
}

- (void)applicationWillResignActive:(UIApplication *)application
{
	[[CCDirector sharedDirector] pause];
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
	[[CCDirector sharedDirector] resume];
}

This solved my problem. I hope it helps someone else.

I’ve recently been using iTerm on the Mac. I was happily using it, until it started crashing on launch. After searching around on the internet, I finally figure out what is wrong. The issue occurred because I was using an external display. When not connected to the external display the app would crash.

I found details in this bug here: http://sourceforge.net/tracker/index.php?func=detail&aid=2889711&group_id=67789&atid=518973

There are 2 easy ways to solve this problem.

1. In the normal terminal type:

defaults delete net.sourceforge.iTerm "NSWindow Frame iTerm Window 0"

2. Open ~/Library/Preferences/net.sourceforge.iTerm.plist and removed the following entry:
NSWindow Frame iTerm Window 0:

Apple is very secretive about it’s products and releases. This makes it very difficult to know if it’s a good time to buy a particular Apple product.

To aid you in your decision, Macrumors.com has a Buyer’s Guide. This guide lists the release history of each product and gives a recommendation as to if now is a good time to buy or not.

If you’re looking to buy a new mac, iphone, monitor, etc.. this guide should be your first stop.