Blank image with POST - iphone

Question

I've an issue with the post of an UIImage on a PHP server, when I post it, the image received is empty.
The method I use is :
- (void)uploadImage {
/*
turning the image into a NSData object
getting the image back out of the UIImageView
setting the quality to 90
*/
NSData *imageData = UIImageJPEGRepresentation(myImage, 0.9);
// setting up the URL to post to
NSString *urlString = #"http://myserver/test.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=\"ipodfile.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];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSLog(returnString);
}
Taken from : http://iphone.zcentric.com/2008/08/29/post-a-uiimage-to-the-web/
Thanks for your help !

Answer 1

I suggest the use of ASIHTTPRequest for this kind of requests. You can do this much more easily with it. Here is an example to how send an image using ASIHTTPRequest:
// Initilize Queue
networkQueue = [[ASINetworkQueue alloc] init];
[networkQueue setUploadProgressDelegate:statusProgressView];
[networkQueue setRequestDidFinishSelector:#selector(imageRequestDidFinish:)];
[networkQueue setQueueDidFinishSelector:#selector(imageQueueDidFinish:)];
[networkQueue setRequestDidFailSelector:#selector(requestDidFail:)];
[networkQueue setShowAccurateProgress:true];
[networkQueue setDelegate:self];
NSData *imageData = UIImageJPEGRepresentation(yourImage, compression);
url = [NSURL URLWithString:#"http://myserver/upload.php"];
ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithURL:url] autorelease];
[request setPostValue:#"myImageName" forKey:#"name"];
[request addData:imageData withFileName:#"someFileName.jpeg" andContentType:#"image/jpeg" forKey:#"uploadedImage"];
[networkQueue addOperation:request];
[networkQueue go];
Hope it helps