Get data from webserver (php/mysql) by ASIHTTPRequest JSON - ios

Question

I am sending reguest to webserver in this function:
-(void)getData
{
NSURL *url = [NSURL URLWithString:#"http://10.10.10.10/application.php"]; //some address
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
request.delegate = self;
[request setPostValue:#"6577098" forKey:#"serial_number"];
[request startAsynchronous];
}
Then on server part in application.php :
<?php
//$serial_number from $_POST["serial_number"];
$serial_number = $this->getString('serial_number', 64);
$stmt = $this->pdo->prepare('SELECT S.DateTime, SN.Name FROM States S LEFT JOIN StateNames SN on SN.ID=S.State_ID WHERE S.SerialNumber = ?');
$stmt->execute(array($serial_number));
$states = $stmt->fetchAll(PDO::FETCH_ASSOC);
$result = array();
foreach ($states as $state)
{
$result[] = $state;
}
sendResponse(200, json_encode($result));
?>
This part works when I try it from browser, it works and I get this:
[{"DateTime":"2013-05-15 10:22:11","Name":"No water"},{"DateTime":"2013-05-13 14:55:31","Name":"Water"}]
Then back to process it in Xcode:
-(void)requestFinished:(ASIHTTPRequest *)request
{
if (request.responseStatusCode == 200)
{
NSString *responseString = [request responseString];
NSLog(#"%#",responseString); //if I try this nothing happened
}
}
I think I have to do something with JSON.
I thing I have bad response on my request. But I have responceStatusCode 200.
Can anyone help me? I didn't find what's wrong.
Thanks

Answer 1

I would need specifics to tell you what server settings you need to adjust. My next best advice - debug line by line. For example in php file, do:
$serial_number = $this->getString('serial_number', 64); //there I get serial_number from $_POST["serial_number"];
echo $serial_number; die;
// ...
at this point if you run your app again, you should see the serial # printed in -(void)requestFinished:(ASIHTTPRequest *)request, if nothing breaks up to here. If you do see it, remove echo and die, move on
//...
$stmt = $this->pdo->prepare('SELECT S.DateTime, SN.Name FROM States S LEFT JOIN StateNames SN on SN.ID=S.State_ID WHERE S.SerialNumber = ?');
$stmt->execute(array($serial_number));
$states = $stmt->fetchAll(PDO::FETCH_ASSOC);
print_r($states); die;
// ...
if no responce there, this might mean that you don't have PDO driver installed with your php.
If the next line sendResponse(200, json_encode($result)); breaks it, then my guess is that your php installation lacks json module.