Posting images using TWRequest

- (void)performTWRequestUpload

{

NSURL *url =

[NSURL URLWithString:

@"https://upload.twitter.com/1/statuses/update_with_media.json"];

//  Create a POST request for the target endpoint

TWRequest *request =

[[TWRequest alloc] initWithURL:url

parameters:nil

requestMethod:TWRequestMethodPOST];

//  self.accounts is an array of all available accounts;

//  we use the first one for simplicity

[request setAccount:[self.accounts objectAtIndex:0]];

//  The "larry.png" is an image that we have locally

UIImage *image = [UIImage imageNamed:@"larry.png"];

//  Obtain NSData from the UIImage

NSData *imageData = UIImagePNGRepresentation(image);

//  Add the data of the image with the

//  correct parameter name, "media[]"

[request addMultiPartData:imageData

withName:@"media[]"

type:@"multipart/form-data"];

// NB: Our status must be passed as part of the multipart form data

NSString *status = @"just setting up my twttr #iOS5";

//  Add the data of the status as parameter "status"

[request addMultiPartData:[status dataUsingEncoding:NSUTF8StringEncoding]

withName:@"status"

type:@"multipart/form-data"];

//  Perform the request.

//    Note that -[performRequestWithHandler] may be called on any thread,

//    so you should explicitly dispatch any UI operations to the main thread

[request performRequestWithHandler:

^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {

NSDictionary *dict =

(NSDictionary *)[NSJSONSerialization

JSONObjectWithData:responseData options:0 error:nil];

// Log the result

NSLog(@"%@", dict);

dispatch_async(dispatch_get_main_queue(), ^{

// perform an action that updates the UI...

});

}];

}