How to upload image on wordpress server by webservice with new “uploads” directory in iphone programming?

I need to upload image by a webservice which is of wordpress server ..

Image is not uploaded because of wordpress structure ..

This is my basic code for image upload in iPhone ..

NSData *myData=UIImagePNGRepresentation([self.img image]);
NSMutableURLRequest *request;
NSString *urlString = @"http://xyzabc.com/iphone/upload.php";
NSString *filename = @"filename";
request= [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];
NSString *boundary = @"---------------------------14737809831466499882746641449";
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];
NSMutableData *postbody = [NSMutableData data];
[postbody appendData:[[NSString stringWithFormat:@"rn--%@rn",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name="userfile"; filename="%@.jpg"rn", filename] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[@"Content-Type: application/octet-streamrnrn" dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[NSData dataWithData:myData]];
[postbody appendData:[[NSString stringWithFormat:@"rn--%@--rn",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:postbody];

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString;
returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSLog(@"%@", returnString);

It returns whole page in returnString !!!

I need only one response is a path of image that I uploaded..

Any one have idea of that?