iOS Problem in uploading image file to a server

[iphonejudy]

I used the below code for uploading a image file.

The connection with server is successfully connected.

But the image was not uploaded.Can anyone tell me the reason?

- (NSData *)generatePostDataForData:(NSData *)uploadData
{
  
	NSLog(@"generatePostDataForData");
	// Generate the post header:
    NSString *post = [NSString stringWithCString:"--AaB03x\r\nContent-Disposition: form-data; name=\"upload[file]\"; filename=\"somefile\"\r\nContent-Type: application/octet-stream\r\nContent-Transfer-Encoding: binary\r\n\r\n" encoding:NSASCIIStringEncoding];
    
    // Get the post header int ASCII format:
    NSData *postHeaderData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    
    // Generate the mutable data variable:
    NSMutableData *postData = [[NSMutableData alloc] initWithLength:[postHeaderData length] ];
    [postData setData:postHeaderData];
    
    // Add the image:
    [postData appendData: uploadData];
    
    // Add the closing boundry:
    [postData appendData: [@"\r\n--AaB03x--" dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]];
    NSLog(@"postLengthhhhhhhhhhhhhhhhhhh %d bytes of data",[postData length]);
    // Return the post data:
    return postData;
	
}

-(IBAction) displayupload:(id) sender
{
// Generate the postdata:
	
	NSLog(@"Display upload");
	NSString *path=@"http://commons.wikimedia.org/wiki/File:Chamomile_flowers.jpg";
	NSData *mydata = [[NSData alloc] initWithContentsOfFile:path];
NSData *postData = [self generatePostDataForData: mydata];
	NSLog(@"Succeeded! Received %d bytes of data",[postData length]);
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
	NSLog(@"postLength=%@",postLength);
// Setup the request:
NSMutableURLRequest *uploadRequest = [[[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://myserver.com/myimages/submit.aspx"] cachePolicy: NSURLRequestReloadIgnoringLocalCacheData timeoutInterval: 30 ] autorelease];
[uploadRequest setHTTPMethod:@"POST"];
[uploadRequest setValue:postLength forHTTPHeaderField:@"Content-Length"];
[uploadRequest setValue:@"multipart/form-data; boundary=AaB03x" forHTTPHeaderField:@"Content-Type"];
[uploadRequest setHTTPBody:postData];

// Execute the reqest:
NSURLConnection *conn=[[NSURLConnection alloc] initWithRequest:uploadRequest delegate:self];
if (conn)
{
	
	NSLog(@"Connection succeeded");
	// Connection succeeded (even if a 404 or other non-200 range was returned).
}
else
{
	
	NSLog(@"Connection failed");
	// Connection failed (cannot reach server).
}
}