To understand how GET requests are made using NSURLSession in Objective-C, I would like an example. And, how is a response obtained?
GET
NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#"give your url here"]];
//create the Method "GET"
[urlRequest setHTTPMethod:#"GET"];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
{
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
if(httpResponse.statusCode == 200)
{
NSError *parseError = nil;
NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:&parseError];
NSLog(#"The response is - %#",responseDictionary);
}
else
{
NSLog(#"Error");
}
}];
[dataTask resume];
Related
I want to integrate digest authentication in my objective c code.
I am using NSURLSessionDataTask.
In first webservice call i fetch the nonce value and then in next call i set the header of the same webservice.
NSDictionary *payload;
payload = #{
#"Username" : #"",
#"Password" : #"",
};
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#""]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:10.0];
[request setHTTPMethod:#"GET"];
NSError *error = nil;
NSData *data = [NSJSONSerialization dataWithJSONObject:payload
options:0 error:&error];
request.HTTPBody = data;
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (error) {
NSLog(#"%#", error);
} else {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
NSLog(#"%#", httpResponse);
NSDictionary* dictHeaders = [(NSHTTPURLResponse *)response allHeaderFields];
NSLog(#"%#",[dictHeaders objectForKey:#"Www-Authenticate"]);
[self callWSAfterAuthentication:[dictHeaders objectForKey:#"Www-Authenticate"]];
}
}];
[dataTask resume];
You have not said in your question what exact problems you have. Assuming the authentication simply does not work:
Add a NSURLSessionDelegate to your NSURLSession and handle the authentication in the URLSession:didReceiveChallenge:completionHandler: delegate method. Check for NSURLAuthenticationMethodHTTPDigest and respond accordingly. (You can find info on how to implement this)
I have this method
- (NSString*) createUserWithName:(NSString*)TheName
{
NSURL *URL =someUrlthatIncludesTheName
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
[request setHTTPMethod:#"GET"];
NSURLSession *session = [NSURLSession sharedSession];
NSURL *URL = [NSURL URLWithString:url];
NSURLSessionTask *task = [session dataTaskWithURL:URL completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (response) {
NSError* error = nil;
NSArray *output = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingMutableContainers
error:&error];
myID = [[output objectAtIndex:0] objectForKey:#"UserID"];
}
}];
[task resume];
return myID;
}
and another method
-(void)doSomethingWith: (NSString*) anID
Somewhere in my code, I call these methods subsequently, like this:
[self createUserWithName:#"John"];
[self doSomethingWith:myID];
However, due to the fact that the NSURLSession in createUserWithName: is asynchronous, doSomethingWith: is fired with myID = (null).
What is the best way to approach this problem, without necessarily falling back to deprecated synchronous NSURLConnection?
Thanks in advance
The workflow is supposed to be
- (void)createUserWithName:(NSString*)TheName
{
NSURL *URL =someUrlthatIncludesTheName
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
[request setHTTPMethod:#"GET"];
NSURLSession *session = [NSURLSession sharedSession];
NSURL *URL = [NSURL URLWithString:url];
NSURLSessionTask *task = [session dataTaskWithURL:URL completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (response) {
NSError* error = nil;
NSArray *output = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingMutableContainers
error:&error];
myID = [[output objectAtIndex:0] objectForKey:#"UserID"];
[self doSomethingWith:myID];
}
}];
[task resume];
}
And the call is just
[self createUserWithName:#"John"];
The method doSomethingWith: is asynchronously executed in the completion block.
Alternatively use a custom completion block
- (void)createUserWithName:(NSString *)theName completion:^(NSString *identifier)completion
{
NSURL *URL =someUrlthatIncludesTheName
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
[request setHTTPMethod:#"GET"];
NSURLSession *session = [NSURLSession sharedSession];
NSURL *URL = [NSURL URLWithString:url];
NSURLSessionTask *task = [session dataTaskWithURL:URL completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (response) {
NSError* error = nil;
NSArray *output = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingMutableContainers
error:&error];
myID = [[output objectAtIndex:0] objectForKey:#"UserID"];
completion(myID);
}
}];
[task resume];
}
and call it with
[self createUserWithName:#"John" completion:^(NSString *identifier) {
[self doSomethingWith:identifier];
}];
I have a rest web service request to be called in Objective C. How to add token to web service request for authentication ??
Thanks in advance
Add token in request as below
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:yourURL] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
[request setHTTPMethod:#"GET"]; // Set your method
[request addValue:#"token_value" forHTTPHeaderField:#"Authorization"];
// ...... your code
// ........ add data
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
//HideProcess;
if (error)
{
//NSLog(#"Error : %#\n", error);
return;
}
if (data != nil)
{
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
NSLog(#"Response :\n%#\n", dict);
}
}];
[task resume];
How to post JSON Data in synchronously way? Can use NSURLSession or AFNetworking or other way?
Sample basic code for posting data to server using synchronous
//PASS YOUR URL HERE
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#"your URL"]];
//create the Method "POST" for posting data to server
[request setHTTPMethod:#"POST"];
//Pass The String to server like below
NSString *strParameters =[NSString strin gWithFormat:#"user_email=%#&user_login=%#&user_pass=%#& last_upd_by=%#&user_registered=%#&",txtemail.text,txtuser1.text,txtpass1.text,txtuser1.text,datestr,nil];
//Print the data that what we send to server
NSLog(#"the parameters are =%#", strParameters);
//Convert the String to Data
NSData *data1 = [strParameters dataUsingEncoding:NSUTF8StringEncoding];
//Apply the data to the body
[request setHTTPBody:data1];
//Create the response and Error
NSError *err;
NSURLResponse *response;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
NSString *resSrt = [[NSString alloc]initWithData:responseData encoding:NSASCIIStringEncoding];
//This is for Response
NSLog(#"got response==%#", resSrt);
if(resSrt)
{
NSLog(#"got response");
}
else
{
NSLog(#"faield to connect");
}
In user3182143's answer, sendSynchronousRequest is deprecated in latest version iOS 9.
You can use NSURLSession
NSURLSession *session = [NSURLSession sharedSession];
[[session dataTaskWithURL:[NSURL URLWithString:londonWeatherUrl]
completionHandler:^(NSData *data,
NSURLResponse *response,
NSError *error) {
NSString *strResult = [[NSString alloc]initWithData:data encoding:NSASCIIStringEncoding];
}] resume];
Here is my solution:
- (IBAction)postJSONSynchronization:(id)sender {
__block BOOL success = NO;
__block NSDictionary *jsonDic = nil;
NSURLSession *session = [NSURLSession sharedSession];
// 创建请求
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:self.url]];
request.HTTPMethod = #"POST"; // 请求方法
NSMutableDictionary *parameters = [NSMutableDictionary dictionary];
[parameters setObject:#13577766655 forKey:#"phoneNumber"];
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];
request.HTTPBody = jsonData; // 请求体
NSCondition *condition = [[NSCondition alloc] init];
// 创建任务
NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(#"Child Thread:%#",[NSThread currentThread]);
if (!error) {
jsonDic = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
success = YES;
} else {
NSLog(#"%#",error);
}
[condition lock];
[condition signal];
[condition unlock];
}];
[task resume];
// 启动任务
NSLog(#"Main Thread:%#",[NSThread currentThread]);
[condition lock];
[condition wait];
[condition unlock];
NSLog(#"测试时机");
NSLog(#"josnDic:%#",jsonDic);}
in my app i am using a UITextView to display Text content on my view. I have an API for the text content to be display on UITextView.
but now i am confused how to display the API content on UITextView. Someone
please provide me the complete code to implement.
API URL: http://any_url
i am sharing the details of the API
Try this code:-
FOR GET REQUEST
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithURL:[NSURL URLWithString:#"https://itunes.apple.com/search?term=apple&media=software"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (error) {
NSLog(#"Error: %#",error);
} else {
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(#"%#", json);
}
}];
FOR POST REQUEST
NSError *error;
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
NSURL *url = [NSURL URLWithString:#"YOUR_API"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
[request addValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request addValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setHTTPMethod:#"POST"];
NSDictionary *mapData = [[NSDictionary alloc] initWithObjectsAndKeys: #"TEST IOS", #"name",
#"IOS TYPE", #"typemap",
nil];
NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];
[request setHTTPBody:postData];
NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (error) {
NSLog(#"Error: %#",error);
} else {
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(#"%#", json);
}
}];
[postDataTask resume];
In the mapData dictionary there will be your parameters if any.
And if not Eliminate this code
NSDictionary *mapData = [[NSDictionary alloc] initWithObjectsAndKeys: #"TEST IOS", #"name",
#"IOS TYPE", #"typemap",
nil];
NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];
[request setHTTPBody:postData];
And then assigned the json to the text property of UITextView's object.
Your data won't magically appear in your UITextView. You will have to do a network request with NSURLSession and parse the data, then you can implement the UITextView its properties and add the data.