how to upload image dynamically on server? - iphone

Question

In my application i want to upload the images to server.
I am able to upload images on server but the name of the image mention in front of filename=%#.jpg. remains the same for images
[body appendData:[[NSString stringWithString:#"Content-Disposition: form-data; name=\"userfile\"; filename=\"%#.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
but i want to save the image on server with the same image name it has......
plz help me out.
following is my code:
-(IBAction)upload:(id)sender
{
//imageview is a UIImageView
NSData *imageData = UIImageJPEGRepresentation(imageView.image, 100);
// setting up the URL to post to
NSString *urlString = #"http://url.com/upload/uploader.php?";
// setting up the request object now
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:#"POST"];
/*
add some header info now
we always need a boundary when we post a file
also we need to set the content type
You might want to generate a random boundary.. this is just the same
as my output from wireshark on a valid html post
*/
NSString *boundary = [NSString stringWithString:#"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:#"multipart/form-data; boundary=%#",boundary];
[request addValue:contentType forHTTPHeaderField: #"Content-Type"];
/*
now lets create the body of the post
*/
NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:#"Content-Disposition: form-data; name=\"userfile\"; filename=\"%#.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:#"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithFormat:#"\r\n--%#--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the reqeust
[request setHTTPBody:body];
// now lets make the connection to the web
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
///self.returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSLog(#"%#",returnString);
}

Answer 1

change
[body appendData:[[NSString stringWithString:#"Content-Disposition: form-data; name=\"userfile\"; filename=\"%#.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
to
[body appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"userfile\"; filename=\"%#.jpg\"\r\n",filename] dataUsingEncoding:NSUTF8StringEncoding]];
where filename is a NSString* variable with your desired filename

Answer 2

this line
[body appendData:[[NSString stringWithString:#"Content-Disposition: form-data; name=\"userfile\"; filename=\"%#.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
Content-Type: image/jpeg
instead of Content-Disposition: form-data
and learn how to use content type