twitpic API help (multipart/form-data upload)

Discussion in 'iOS Programming' started by begdev, Nov 21, 2009.

  1. begdev macrumors newbie

    Mar 14, 2009
    I've put together this code from lots of research.
    Information on the twitpic API is here: Twitpic - Share photos on Twitter

    Through debugging i can tell that the dictionary is good, and that it gets through all the methods, the request gets submitted, but then the NSLog method returns <>.

    I'm not sure where I could be going wrong, i don't know much about the multipart/form-data structure. Maybe I'm doing something wrong with my connection?

    Code below.

    -(void)uploadBoth {		
    		//Create dictionary of post arguments
    		NSArray *keys = [[NSArray alloc] initWithObjects:@"media",@"username",@"password",@"message",nil];
    		NSArray *objects = [[NSArray alloc] initWithObjects:
    							imageData, twitterUserSave, twitterPassSave, [NSString stringWithFormat:@"%@",messageView.text], nil];
    		NSDictionary *keysDict = [[NSDictionary alloc] initWithObjects:objects forKeys:keys];
    	NSLog(@"%@", keysDict);
    		//create twitpic photo post
    		NSURLRequest *twitpicPost = [self twitpicRequest:keysDict withData:imageData];
    		//send request, return YES if successful
    		NSURLConnection *twitpicConnection = [[NSURLConnection alloc] initWithRequest: twitpicPost delegate:self];
    		if (!twitpicConnection) {
    			NSLog(@"Failed to submit request");
    		} else {
    			NSLog(@"Request submitted");
    			NSData *receivedData = [[NSMutableData data] retain];
    			NSLog(@"%@", receivedData); // THIS PART RETURNS <>
    The NSURLRequest part
    -(NSURLRequest *)twitpicRequest:(NSDictionary *)postKeys withData:(NSData *)data {
    	NSLog(@"got this far");
    		//create the URL POST Request to twitpic
    		NSURL *twitpicURL = [NSURL URLWithString:@""];
    		NSMutableURLRequest *twitpicPost = [NSMutableURLRequest requestWithURL:twitpicURL];
    		[twitpicPost setHTTPMethod:@"POST"];
    		//Add the header info
    		NSString *stringBoundary = [NSString stringWithString:@"0xAbCdEfGbOuNdArY"];
    		NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",stringBoundary];
    		[twitpicPost addValue:contentType forHTTPHeaderField: @"Content-Type"];
    		//create the body
    		NSMutableData *postBody = [NSMutableData data];
    		[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    		//add key values from the NSDictionary object
    		NSEnumerator *keys = [postKeys keyEnumerator];
    		int i;
    		for (i = 0; i < [postKeys count]; i++) {
    			NSString *tempKey = [keys nextObject];
    			[postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",tempKey] dataUsingEncoding:NSUTF8StringEncoding]];
    			[postBody appendData:[[NSString stringWithFormat:@"%@",[postKeys objectForKey:tempKey]] dataUsingEncoding:NSUTF8StringEncoding]];
    			[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    		//add data field and file data
    		[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"data\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    		[postBody appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    		[postBody appendData:[NSData dataWithData:data]];
    		[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    		//add the body to the post
    		[twitpicPost setHTTPBody:postBody];
    	return twitpicPost;

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