Question

I am trying to upload a PNG file on FTP server using the following code.

NSURL *ftpURL=[NSURL URLWithString:@"ftp://username:password@localhost"];

NSMutableURLRequest *urlRequest=[[NSMutableURLRequest alloc] initWithURL:ftpURL];
[urlRequest setHTTPMethod:@"POST"];
[postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"imageUrl\"; filename=\"dummy.png\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"Content-Type: image/png\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"Content-Transfer-Encoding: binary\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

UIImage *img=[UIImage imageNamed:@"a.png"];
NSMutableData *postData=[[NSMutableData alloc] init];
NSData *data=UIImagePNGRepresentation(img);
[postData appendData:data];
[urlRequest setHTTPBody:postData];

[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self startImmediately:YES];

I don’t receive any NSURL connection,like it has failed or ask for Authentication. Only, call back I receive is of

-(void) connectionDidFinishLoading:(NSURLConnection *)connection

I am not sure whether NSURLConnection supports ftp upload. I am not looking to implement it using CFFTPStream. Can any one correct me in my approach?

Answer 1

Your are trying to use FTP and POST in one go, which won’t work in almost any case.

FTP is a complete different protocoll, see for example http://www.faqs.org/rfcs/rfc959.html

It is somewhat more interactive, however many ftp server have a http wrapper which allows easy download, but upload will remain special. So if you want to use it, you should take a library or CFFTPStream.