Consuming a web service in your iPhone app

dapinheiro · February 10th, 2011, 02:24 PM

Hello guys,

I'm doing chapter 16 - web services

In the book a web service address(www.ecubicle.net/iptocountry.asmx) is given but unfortunly its not available.

So i'm using the following one: http://www.w3schools.com/webservices...nheitToCelsius

the problem is that the soap response is giving me the following error: Server did not recognize the value of HTTP Header SOAPAction: http://www.w3schools.com/webservices...nheitToCelsius.

Code:

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><soap:Fault><faultcode>soap:Client</faultcode><faultstring>Server did not recognize the value of HTTP Header SOAPAction: http://www.w3schools.com/webservices/tempconvert.asmx?op=FahrenheitToCelsius.</faultstring><detail /></soap:Fault></soap:Body></soap:Envelope>

Why is a dot at the end of the service ? maybe can be this causing my problem.

Take a look above at my code and soap request..

CODE:

Code:

-(IBAction)btnConvertToCelsius:(id)sender{

	//NSString *soapMsg = [NSString stringWithFormat:@"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
	//					 "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://www.w3.org/2003/05/soap-envelope\">"
	//					 "<soap:Body>"
	//					 "<FahrenheitToCelsius xmlns=\"http://tempuri.org/\">"
	//					 "<Fahrenheit>%@</Fahrenheit>"
	//					 "</FahrenheitToCelsius>"
	//					 "</soap:Body>"
	//					 "</soap:Envelope>", value_.text];
	
	
	NSString *soapMsg = [NSString stringWithFormat:@"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
						 "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
						 "<soap:Body>"
						 "<FahrenheitToCelsius xmlns=\"http://tempuri.org/\">"
						 "<Fahrenheit>%@</Fahrenheit>"
						 "</FahrenheitToCelsius>"
						 "</soap:Body>"
						 "</soap:Envelope>", value_.text];
	
	
	
	NSLog(@"%@",soapMsg);
	
	NSURL *url = [NSURL URLWithString:@"http://www.w3schools.com/webservices/tempconvert.asmx"];
	
	NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
	
	NSString *msgLenght = [NSString stringWithFormat:@"%d", [soapMsg length]];
	
	[req addValue:@"tet/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
	
	
	[req addValue:@"http://www.w3schools.com/webservices/tempconvert.asmx?op=FahrenheitToCelsius" forHTTPHeaderField:@"soapaction"];
	
	[req addValue:msgLenght forHTTPHeaderField:@"Content-Lenght"];
		
	[req setHTTPMethod:@"POST"];
	
	[req setHTTPBody:[soapMsg dataUsingEncoding:NSUTF8StringEncoding]];
	
	[activityIndicator startAnimating];
	
	conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];
	
	if (conn) {
		webData = [[NSMutableData data] retain];
	}
	
}

-(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *) response{

	[webData setLength:0];
}

-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *) data{
	
	[webData appendData:data];
}

-(void) connection:(NSURLConnection *)connection didFailWithError:(NSError *) error{
	
	[webData release];
	[connection release];
}

-(void) connectionDidFinishLoading:(NSURLConnection *)connection{
	
	NSLog(@"DONE. Received Bytes:%d",[webData length]);
	
	NSString *theXml = [[NSString alloc] initWithBytes:[webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding];
	
	NSLog(@"%@",theXml);
	[theXml release];
	
	[activityIndicator stopAnimating];
	
	[connection release];
	
	[webData release];
}

SOAP REQUEST:

Code:

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><FahrenheitToCelsius xmlns="http://tempuri.org/"><Fahrenheit>55</Fahrenheit></FahrenheitToCelsius></soap:Body></soap:Envelope>

thepianoguy · February 11th, 2011, 12:45 AM

You have a few errors that need to be corrected.

[req addValue:@"tet/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"]; //typo text/xml

[req addValue:@"http://www.w3schools.com/webservices/tempconvert.asmx?op=FahrenheitToCelsius" forHTTPHeaderField:@"soapaction"];//incorrect should be
[req addValue:@"http://tempuri.org/FahrenheitToCelsius" forHTTPHeaderField:@"SOAPAction"];

As you can see from the page in your link
POST /webservices/tempconvert.asmx HTTP/1.1
Host: www.w3schools.com
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://tempuri.org/FahrenheitToCelsius" This is the SOAPAction

[req addValue:msgLenght forHTTPHeaderField:@"Content-Lenght"]; // typo "Content-Length"

For working examples of the WebService refer to

Problem with web service example chapter 14

I have made two working examples of Web Services available including a Temperature Converter. Check for download links on a January 20 post from thepianoguy

These corrections should resolve your request error.
Bob

dapinheiro · February 11th, 2011, 06:17 AM

Bob,

I've download your code, but i was able to receive a response from soap with your corrections ! Many thanks

thepianoguy · February 11th, 2011, 08:44 AM

Glad it worked. I didn't actually compile your code, just did a visual inspection, so I could have missed something.
The projects I did for the other forum (different book by the same author, identical project and, annoyingly, same lack of functionality that should have been addressed on the forum or in an errata, since it was pointed out months before this book was released) also include a working ipToCountry, extension of use of the xmlParser and implementations of all versions of the requests (SOAP 1.1, SOAP 1.2, HTTP_GET and HTTP_POST) when available.
I probably got more out the Chapter since project didn't work, since I had to find out a way to make it work. It seems you had the same mindset in looking for alternatives. However, I would prefer it if the Chapter project did work, and finding, and implementing another service was followup exercise or challenge.
Bob

Anupdas · May 30th, 2013, 10:40 AM

I'm posting this code as I found this link useful. There are a few syntax errors, in the original answer.

Code:

        NSString *soapMessage = //form the soap envelope
    
        NSURL *url = [NSURL URLWithString:@"http://www.w3schools.com/webservices/tempconvert.asmx"];
	
	NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
	
	[urlRequest addValue:@"text/xml"
          forHTTPHeaderField:@"Content-Type"];
	    
	[urlRequest setHTTPMethod:@"POST"];
	
	[urlRequest setHTTPBody:[soapMessage
                 dataUsingEncoding:NSUTF8StringEncoding]];
    
       [NSURLConnection sendAsynchronousRequest:urlRequest 
                                                            queue:[NSOperationQueue mainQueue] 
                                           completionHandler:^(NSURLResponse *response, 
                                                                        NSData *responseData,
                                                                        NSError *error) 
       {
        
           NSString *responseString = [[NSString alloc]initWithData:responseData
                                                                             encoding:NSUTF8StringEncoding];
        
           NSLog(@"%@",responseString);
        
       }];