iPhone POST to PHP failing

Question

I have this code here:

NSString *post = [NSString stringWithFormat:@"deviceIdentifier=%@&deviceToken=%@",deviceIdentifier,deviceToken]; 
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:NO];
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]]; 
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; 
[request setURL:[NSURL URLWithString:@"http://website.com/RegisterScript.php"]]; 
[request setHTTPMethod:@"POST"]; 
[request setValue:postLength forHTTPHeaderField:@"Content-Length"]; 
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; 
[request setValue:@"MyApp-V1.0" forHTTPHeaderField:@"User-Agent"];
[request setHTTPBody:postData]; 
NSData *urlData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 
NSString *response = [[NSString alloc] initWithData:urlData encoding:NSASCIIStringEncoding]; 

which should be sending data to my PHP server to register the device into our database, but for some of my users no POST data is being sent. I've been told that this line:

NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:NO];

may be causing the problem. Any thoughts on why this script would sometimes not send the POST data? On the server I got the packet trace for a failed send and the Content-lenght came up as 0 so no data was sent at all.

Answer 1

I am doing a similar function in mine and the only thing that differs is the line you think is wrong. Try doing

NSMutableData *postData = [NSMutableData data];
[postData appendData:[[NSString stringWithFormat::@"deviceIdentifier=%@&deviceToken=%@",deviceIdentifier,deviceToken]dataUsingEncoding:NSUTF8StringEncoding]];

stringByUrlEncoding basically replaces any reserved characters with their character encoded safe string(I think thats the best way to explain it, my mind is blank atm).

Hope that helps