Question

I’m new with Objective-C, i’m working in an application and I need to connect to a Java’s servlet using HTTP Post.

I searched over internet and found a lot of information related with NSMutableURLRequest an NSURLConnection.
I made some test and now I can send and receiveStrings but I need to make some changes and I don´t know how can I do.

I want to send a message to my Servlet using a String (done) and I want to Stop the excecution until receive a response from the Servlet (This is my problem). I can´t stop the excecution, i don´t know how to do that.

This is my code:

- (NSString *)sendPostRequest: (NSString*)stringToSend {

//URL en formato String
NSString *urlString = @"http://192.168.1.1:8080/Servlet/ListenerServlet";

//Armo el Body con los Datos a enviar
NSMutableString* requestBody = [[NSMutableString alloc] init];
[requestBody appendString:stringToSend]; 

//Creo el Request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

//Creo el Objecto con la URL dentro
NSURL *url = [NSURL URLWithString: [NSString stringWithString:urlString]];

//Seteo la URL al Request
[request setURL:url];

//Armo los Datos a Enviar
NSString* requestBodyString = [NSString stringWithString:requestBody];
NSData *requestData = [NSData dataWithBytes: [requestBodyString UTF8String] length: [requestBodyString length]];

//Seteo el Metodo de Envio
[request setHTTPMethod: @"POST"];

//Seteo los Datos a Enviar
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
[request setHTTPBody: requestData];

//Creo la Conexion y automaticamente se envia
[[NSURLConnection alloc] initWithRequest:request delegate:self];

[requestBody release];  
[request release];  

return @"";
}

Can somebody help me?

Thanks and sorry for my poor english

Answer 1

Finally I make it work using NSMutableURLRequest and NSURLConnection with sendSynchronousRequest.

This is the code used:

- (NSString*) sendPostRequest:(NSString *)stringToSend{

NSString *urlString = [self serverURL];

NSURL *url = [NSURL URLWithString: urlString];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

[request setHTTPMethod:@"POST"];

//set headers

[request addValue:@"Content-Type" forHTTPHeaderField:@"application/x-www-form-urlencoded"];

[request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

[request setHTTPBody:[stringToSend dataUsingEncoding:NSASCIIStringEncoding]];

[request setTimeoutInterval:90]; // set timeout for 90 seconds

NSURLResponse **response = NULL;

NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:response error:nil];

NSString *responseDataString = [[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding];

NSLog(@"Response %@", responseDataString);

return responseDataString;

}