Question

I have a simple asp.net web service which returns json format data. I want to send http post request with parameter for getting json data. How can I send request and get data ?

post request:

POST /JsonWS.asmx/FirmaGetir HTTP/1.1
Host: localhost
Content-Type: application/x-www-form-urlencoded
Content-Length: length

firID=string

answer:

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length    
<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">string</string>

I’m trying some codes but they didn’t work.

NSString *firmadi =@"";
NSMutableData *response;


-(IBAction)buttonClick:(id)sender
{
    NSString *firid = [NSString stringWithFormat:@"800"];

    response = [[NSMutableData data] retain];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://192.168.1.23/testService/JsonWS.asmx?op=FirmaGetir"]];

    NSString *params = [[NSString alloc] initWithFormat:@"firID=%@",firid];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [[NSURLConnection alloc] initWithRequest:request delegate:self];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    if(theConnection)
    {
        response = [[NSMutableData data] retain];

    }
    else 
    {
        NSLog(@"theConnection is null");
    }

}

-(void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)responsed
{
    [response setLength:0];
     NSURLResponse * httpResponse;

    httpResponse = (NSURLResponse *) responsed;

}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data
{
    [response appendData:data];
    //NSLog(@"webdata: %@", data);

}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError*)error
{
    NSLog(@"error with the connection");
    [connection release];
    [response release];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{

    response = [[NSMutableData data] retain];

 NSString *responseString = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
    NSLog(@"%@",responseString);

}

Answer 1

What are you doing here:

[[NSURLConnection alloc] initWithRequest:request delegate:self];

This line returns a NSURLConnection but you are not storing it. This is doing nothing for you.

You are clearing your data before you read it:

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    response = [[NSMutableData data] retain]; // This line is clearing your data get rid of it
    NSString *responseString = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
    NSLog(@"%@",responseString);

}

Edit

-(IBAction)buttonClick:(id)sender {

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://192.168.1.23/testService/JsonWS.asmx?op=FirmaGetir"]
                                                           cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
                                                       timeoutInterval:15];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:[@"firID=800" dataUsingEncoding:NSUTF8StringEncoding]];
    self.connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [self.connection start];

}


#pragma NSURLConnection Delegates

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

    if (!self.receivedData){
        self.receivedData = [NSMutableData data];
    }
    [self.receivedData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

     NSString *responseString = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding];
     NSLog(@"%@",responseString);
}