In my app i'm creating now i use goo.gl's url shortener api to shorted urls. I have it nearly working, I can send the longUrl to retrieve the short one in a NSString but it's in this format:
{
"kind": "urlshortener#url",
"id": "http://goo.gl/something",
"longUrl": "http://somethinglonggggg/"
}
I just wondered if there is a way to just take the id (short url) from that.
Here's what I have so far:
NSString *longURL = urlText.text;
NSData *reqData = [[NSString stringWithFormat:#"{\"longUrl\":\"%#\"}", longURL] dataUsingEncoding:NSUTF8StringEncoding];
NSMutableURLRequest *request = [NSMutableURLRequest
requestWithURL:[NSURL URLWithString:#"https://www.googleapis.com/urlshortener/v1/url"]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:20];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:reqData];
NSError *err = [[NSError alloc] init];
NSData *retData = [NSURLConnection sendSynchronousRequest:request
returningResponse:nil
error:&err];
if([err domain]) return;
NSString *retString = [[NSString alloc] initWithData:retData encoding:NSUTF8StringEncoding];
if([retString rangeOfString:#"\"error\""].length) return;
NSLog(#" longUrl equals %# ", longURL);
NSLog(#" retString equals %# ", retString);
urlText.text = retString;
You defenitively need to turn that into an NSDictionary (that JSON syntax is for a dictionary, or an object, however you want to call it.
The google API for Objective-C supports JSON parsing to turn the response into objects.
You can find it here.
If all you need is parsing the JSON, I would recommend either JSONkit or TouchJSON.
They both work in very similar ways, you give them the string and they will give you back objects.
The info for the individual usage of the libraries can be found on the readme of the respective project, there you will find how easy to use they are.
You would then acces the different values using:
NSString *short URL = [object valueForKey:#"id"];
This is the best way to interact with REST services.
Hope it helps!
Related
I have a web service that allows me to update records on in our database.
The columns in the table are as follows:
allowsActions
assetID
inventoryObjectID
objectDescription
quantity
retired
serialNumber
action
I'm using the following to GET data from the webservice.
NSString *urlString = [NSString stringWithFormat:#"%#", inventoryAndActionsWebservice];
NSURL *url = [NSURL URLWithString:urlString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:#"GET"];
Then shoving into a dictionary like so:
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError)
{
if (data.length > 0 && connectionError == nil)
{
NSLog(#"WE HAS THE DATAS");
NSDictionary *inventory = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];
// Then storing the values in CoreData here
}
}
What would be the syntax for updating the webservice? It expects an object in the body of the service call (POST).
NSMutableURLRequest let's you setHTTPBody: and setHTTPMethod:.#"POST"is the way to do a post. Most services need to know the body length and encoding set in headers. (seeaddValue:forHTTPHeaderField:`) for that.
The only reason this topic is tricky is because the developer is forced to grapple with two problems at once: what constitutes a valid request for my server, and (2) how do I form that request with iOS? Part (2) is actually pretty easy once you get a valid request.
The best way to proceed is to get an example working using curl (or something equivalent). Then move on to producing that request in iOS. If you have trouble, ask a question here of the form: "I know my server needs X, here's my code to produce X, but I'm getting this error Y".
So the syntax that I was looking for was ultimately this:
NSString *jSONString = [NSString stringWithFormat:#"{\"MediaInventoryObjectsId\":%d,\"AssetId\":%d,\"Quantity\":%d,\"SerialNumber\":\"%#\",\"Description\":\"%#\",\"AllowActions\":%d,\"Retired\":%d}",inventoryObjectId, assetID, quantity, serialNumber, description, allowActions, retired];
// Convert jSON string to data
NSData *putData = [jSONString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
// Instantiate a url request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
// Set the request url format
[request setURL:[NSURL URLWithString:[NSString stringWithFormat:#"%#/%d", inventoryAndActionsWebservice, inventoryObjectId]]];
[request setHTTPMethod:#"PUT"];
[request setHTTPBody:putData];
[request setValue:#"application/json" forHTTPHeaderField:#"content-type"];
// Send data to the webservice
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
I have seen some post which uses google translate web page.
NSString* englishString = [englishInputArray objectAtIndex:i];
NSString *urlPath = [NSString stringWithFormat:#"/translate_a/t?client=t&text=%#&langpair=en|fr",englishString];
NSURL *url = [[NSURL alloc] initWithScheme:#"http" host:#"translate.google.com" path:urlPath];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;
[request setURL:url];
[request setHTTPMethod:#"GET"];
NSURLResponse *response;
NSError *error;
NSData *data;
data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSString *result = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
NSLog(#"Text: %#",result);
I have two questions:
1)the json return from the web page look like this
[[["Bonjour","Hello","",""]],[["interjection",["bonjour","salut","all\u00f4","tiens"]]],"en",,[["Bonjour",[5],1,0,1000,0,1,0]],[["Hello",4,,,""],["Hello",5,[["Bonjour",1000,1,0]],[[0,5]],"Hello"]],,,[],1]
Other than doing string manipulation is there a way to get the the exact translation string alone ie in tis case "Bonjour" alone.
2: Does anybody know if this is this a free service ? Google apis seems to be a paid service. But if you use web page is that a free service.
No. All API's I've used have always been either JSON or XML. There is no reason to use string manipulation when you can just parse the data into a readable structure
If you are looking to use another service that isn't paid, keep in mind there are normally strict limitations. Try something like: SDL https://www.beglobal.com/developers/api-documentation/
Have you read Google's Translate API Documentation?
https://developers.google.com/translate/
For example performing a GET request like so
GET https://www.googleapis.com/language/translate/v2?key=INSERT-YOUR-KEY&source=en&target=de&q=Hello%20world
Should return the following response:
{
"data": {
"translations": [
{
"translatedText": "Hallo Welt"
}
]
}
}
With this you can just parse the JSON and display the data
So I asked this question recently and I was able to make it work
objective c calling wcf rest service request
Here's my code
NSString *urlStringRequest = [NSString stringWithFormat:#"http://service.mydomain.com/UserAccountService.svc/UserLogin?id=%#&pword=%#", email, incPassword];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlStringRequest]];
[request setHTTPMethod:#"GET"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
NSError *error = nil;
NSURLResponse *response = nil;
NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
id jsonResult = [self parseJsonResult:result];
NSLog(#"Json Result Woop: %#", jsonResult);
the parseJsonResult is exactly the same as the one that was on the link. My problem is though, whenever I would show the jsonResult on the NSLog, it would show the json result which is:
Json Result Woop: {
Authenticated = 0;
Message = "Invalid Log In.";
}
But I'm not really sure how I can go into the variable and retrieve the key and it's value one by one.
I tried to do this:
NSError *jsonParseError = nil;
NSMutableArray *jsonArray = [NSJSONSerialization JSONObjectWithData:result options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&jsonParseError];
if(!jsonArray)
NSLog(#"Parse error: %#", jsonParseError);
else
for(NSDictionary *item in jsonArray)
NSLog(#"%#", item);
using the result variable but it would just give me the keys.
Not really sure what to do.
JsonResult is already an NSDictionary as evidenced by NSLog showing it like this with curly braces. Just use
jsonResult[#"Message"]
to get to the value for the Message key.
On 01.08.12 Bing modified their search api to a Azure, How can I authenticate in Objective-C to use the new bing search api from Azure?
My best guess is to learn from the provided PHP example in the migration word document!! http://go.microsoft.com/fwlink/?LinkID=248077 (Oh god, can't you setup a web page!) or this Java Question - Bing Search API Azure Marketplace Authentication in Java
I'm using ASIHTTPRequest to authenticate with following code.
NSString *queryString = [NSString stringWithFormat:#"'%#'", queryString];
queryString = [queryString urlEncodeUsingEncoding:NSUTF8StringEncoding]; //You'll have to implement url encoding method, preferably in a string category file
NSString *urlString = [NSString stringWithFormat:#"https://api.datamarket.azure.com/Data.ashx/Bing/Search/v1/Image?Query=%#&Market='en-US'&$top=50&$format=json", queryString];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:urlString] ];
[request setAuthenticationScheme:(NSString *)kCFHTTPAuthenticationSchemeBasic];
[request setUsername:#"YOUR_KEY_HERE"];
[request setPassword:#"YOUR_KEY_HERE"];
[request setDelegate:self];
[request startAsynchronous];
Please note, no appID required. just instead pass your key as username and password. It is successfully getting the data.
However, can't really convert the data to NSString. tried every encoding but can't get the string from the data. Initial googling says it's UTF-8 encoded. But no success.
For above code to work, you must add ASIHTTP framework.
Another thing is, my guess is passing base64 encoded string with this format your_key:yourkey should also work with basic authentication.
I was able to get it to work using just NSUrlConnection. You must first base64encode
NSString *keyString = [NSString stringWithFormat:#"%#:%#", BING_SEARCH_API_KEY, BING_SEARCH_API_KEY];
NSData *plainTextData = [keyString dataUsingEncoding:NSUTF8StringEncoding];
NSString *base64String = [plainTextData base64EncodedString];
Setup your request
NSMutableURLRequest *req = [[NSMutableURLRequest alloc] init];
[req setURL:[NSURL URLWithString:searchUrl]];
NSString *authValue = [NSString stringWithFormat:#"Basic %#", base64String];
[req setValue:authValue forHTTPHeaderField:#"Authorization"];
Make the request
NSError *error = [[NSError alloc] init];
NSHTTPURLResponse *response = nil;
NSData *data = [NSURLConnection sendSynchronousRequest:req returningResponse:&response error:&error];
Look at the documentation about how to form searchUrl, and then process data according to the format you specified in $format= (I used json, so mine looks like):
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
I left out error handling, dont forget to add that by checking response as well as error.
I've read through the questions and answers related to TouchJSON serialization and I'm still not getting it to work.
I create an NSDictionary with sample data and used the JSONTouch serializer to convert the NSDictionary to JSON. However, when I log the NSData object 'theJSONData', it gives me this as a result:
<7b223131 31353535 34343434 223a2250
...
65227d>
Additionally, when I send this 'theJSONData' data to the web service (that's expecting JSON) this is what I get back:
2011-07-31 18:48:46.572 Street Lights[7169:207] Serialization Error: (null)
2011-07-31 18:48:46.804 Street Lights[7169:207] returnData: (null)
2011-07-31 18:48:46.805 Street Lights[7169:207] Error: Error Domain=kJSONScannerErrorDomain Code=-201 "Could not scan array. Array not started by a '[' character." UserInfo=0x4d51ab0 {snippet=!HERE>!?xml version="1.0" , location=0, NSLocalizedDescription=Could not scan array. Array not started by a '[' character., character=0, line=0}
What am I doing wrong? Does the JSON NSData object 'theJSONData' need to be converted to another type before I send it to the web service? Is there another step I'm missing?
// Create the dictionary
NSDictionary *outage = [[NSDictionary alloc] initWithObjectsAndKeys:
#"YCoord", #"12678967.543233",
#"XCoord", #"12678967.543233",
#"StreetLightID", #"666",
#"StreetLightCondition", #"Let's just say 'BAD'",
#"PhoneNumber", #"1115554444",
#"LastName", #"Smith",
#"Image",#"",
#"FirstName", #"Dawn",
#"Comments", #"Pole knocked down",
nil];
NSError *error = NULL;
// Serialize the data
NSData *theJSONData = [[CJSONSerializer serializer] serializeDictionary:outage error:&error];
NSLog(#"theJSONData: %#", theJSONData);
NSLog(#"Serialization Error: %#", error);
// Set up the request and send it
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: #"http://24.52.35.127:81/StreetLight/StreetlightService/CreateStreetLightOutage"]];
[request setHTTPMethod: #"POST"];
[request setHTTPBody: theJSONData];
// Deserialize the response
NSData *returnData = [ NSURLConnection sendSynchronousRequest: request returningResponse: nil error:&error];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];
NSData *theReturnData = [returnString dataUsingEncoding:NSUTF8StringEncoding];
id theObject = [[CJSONDeserializer deserializer] deserializeAsArray:theReturnData error:&error];
NSLog(#"returnData: %#",theObject);
NSLog(#"Error: %#", error);
Thanks for everyone's help. I ended up using Fiddler to track what needed to be sent to the service in JSON and then saw I hadn't been formatting the header correctly. Here is the code that ended up working for me.
// Create the NSDictionary
NSDictionary *outage = [[NSDictionary alloc] initWithObjectsAndKeys:
#"12.543233",#"YCoord",
#"12.543233",#"XCoord",
#"111",#"StreetLightID",
#"Dented pole",#"StreetLightCondition",
#"1115554444",#"PhoneNumber",
#"Black",#"LastName",
[NSNull null],#"Image",
#"White",#"FirstName",
#"Hit by a car",#"Comments",
nil];
// Serialize the data
NSError *error = NULL;
NSData *theJSONData = [[CJSONSerializer serializer] serializeDictionary:outage error:&error];
NSLog(#"Serialization Error: %#", error);
// Change the data back to a string
NSString* theStringObject = [[NSString alloc] initWithData:theJSONData encoding:NSUTF8StringEncoding];
// Determine the length of the data
NSData *requestData = [NSData dataWithBytes: [theStringObject UTF8String] length: [theStringObject length]];
NSString* requestDataLengthString = [[NSString alloc] initWithFormat:#"%d", [requestData length]];
// Create request to send to web service
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: #"http://11.22.33.444:55/StreetLight/StreetlightService/CreateStreetLightOutage"]];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:requestData];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:requestDataLengthString forHTTPHeaderField:#"Content-Length"];
[request setTimeoutInterval:30.0];
// Deserialize the response
NSData *returnData = [ NSURLConnection sendSynchronousRequest: request returningResponse: nil error:&error];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];
NSData *theReturnData = [returnString dataUsingEncoding:NSUTF8StringEncoding];
id theObject = [[CJSONDeserializer deserializer] deserializeAsArray:theReturnData error:&error];
NSLog(#"returnData: %#",returnString);
NSLog(#"Error: %#", error);
For one thing, you've got your objects and keys reversed in the NSDictionary.
I don't know enough about TouchJSON to help with that part of the code.
I am having similar issues in parsing a goodle v3 api response. Still no closer to resolving my issue, but one thing I have found that may be helpful to you is if you are using the deserializerAsArray then the JSON response must be enclose in "[" and "]" and if you are deserializerAsDictionary then the JSON response must be enclosed in "{" and "}".
As the google v3 api JSON response is in the "{" "}" format I need to use deserialiserAsDictionary method.
I suspect you know this already, but after looking at Jonathan Wight's code this is as far as I have come in resolving my own issue as Jonathan's code is specific in checking for the above in parsing the JSON response.
Thanks,
Tim