Question

I’m new to Objective-c. I’m trying to do a simple get request and get the page content as a result but the response is always empty.

Here is my code, what am I doing wrong here?

main

HttpManager* pHttpManager;
pHttpManager  = [[HttpManager alloc] init];
NSURL *myURL = [pHttpManager getUrlContent:@"http://www.wikipedia.org"];
NSError* error = nil;
if(myURL) {
  NSLog(@"NSURL is valid");
  NSLog(@"absoluteString:%@",myURL.absoluteString);
  NSString *myHomePage = [NSString stringWithContentsOfURL: myURL encoding: NSASCIIStringEncoding error:&error];
  if(myHomePage) {
    NSLog(@"%@", myHomePage);
  } else {
    NSLog(@"Error = %@", error);
  }
} else {
  NSLog(@"NSURL with error");
}

HttpManager Class

@implementation HttpManager
-(NSURL*) getUrlContent:(NSString*) url {
  NSURL *myURL = [NSURL URLWithString:url];
  return myURL;
}

The Error:

$ ./obj/simple_app.exe
2013-01-13 10:15:06.400 simple_app[7656] NSURL is valid
2013-01-13 10:15:06.406 simple_app[7656] absoluteString:http://www.wikipedia.org
2013-01-13 10:15:07.383 simple_app[7656] unable to set blocking mode – An invalid argument was supplied.
2013-01-13 10:15:07.398 simple_app[7656] Error = NSCocoaErrorDomain 259

Answer 1

Normally one would do this:

NSString *myHomePage = [NSString stringWithContentsOfURL: myURL
                        encoding: NSUTF8StringEncoding error:&error];

What happens when you try that? (And why did you use NSASCIIStringEncoding in the first place?)

The web page at http://www.wikipedia.org contains Unicode characters that cannot be represented in the ASCII encoding, but can be represented in the (far more modern) UTF-8 encoding. There is rarely any reason to use ASCII anymore unless you are working with very old data.