Calling .NET REST web service from iOS using AFNetworking. – Part 2

Previously I talked about calling a .NET REST full web service method that returns a string. Now I’m going to talk about a GET method, which returns an object. 

I’m going to pass the user name and going get the user details as a UserDC object. Lets see how to do that.

This how your web service interface method look like.

	[OperationContract]
	[WebGet(UriTemplate = "GetUserDetails?userId={userId}", ResponseFormat = WebMessageFormat.Json)]
	UserDC GetUserDetails(Guid userId);

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This is how your service method looks like.

	public UserDC GetUserDetails(Guid userId)
	{
	var user = myService.GetUserDetails(userId);
	UserDC userDC = new UserDc();
	userDC.Id = user.Id;
	userDC.FirstName = user.FirstName;
	userDC.LastName = user.LastName;
	userDC.ImageUrl = user.ImageUrl;
	return userDC;
	}

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In iOS this is how you should call it. Hear I have written my method using blocks so after calling the web service it will notify the caller.

	+ (void)getUserDetails:(NSString*)userId withBlock:(void (^)(UserDC* userDc, NSError *error))block {
	NSURL *url = [NSURL URLWithString:yourAppUrl];
	NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
	userId, @"userId",
	nil];
	AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL:url];
	NSMutableURLRequest *request = [client requestWithMethod:@"GET" path:@"GetUserDetails" parameters:params];
	[request setValue:@"application/json; charset=UTF-8" forHTTPHeaderField:@"Content-Type"];
	AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
	if (block)
	{
	UserDC *user=[[UserDC alloc]init];
	user.UserId = [JSON valueForKeyPath:@"UserId"];
	user.FirstName = [JSON valueForKeyPath:@"FirstName"];
	user.LastName = [JSON valueForKeyPath:@"LastName"];
	user.ImageUrl =[JSON valueForKeyPath:@"ImageURL"];
	if(block)
	{
	block(user,nil);
	}
	else
	{
	block(nil, nil);
	}
	}
	} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
	block(nil, error);
	}];
	[operation start];
	}

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