I'm fairly new to objective c but I'm using this code
NSURL *url = [NSURL URLWithString:#"http://xxx.com"];
NSURLRequest *req = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30];
NSURLResponse *resp = nil;
NSData *data = [NSURLConnection sendSynchronousRequest:req returningResponse:&resp error:nil];
NSLog(#"received %???", [data XYZ]);
to try and grab the raw content of a webpage. What would I have to insert instead of XYZ (and obviously ???) so that I could just print the website data. I know that the code pulls some data down because I can use XYZ = length to get the size of the incoming data. If anyone could help, that would be great!
(If anyone could additionally explain how I could have found this in the apple documentation, that would also be really useful)
I assume you mean converting the NSData to a NSString so you can print it?
You should use
[NSString stringWithData:data encoding:NSUTF8StringEncoding]
to create a string from the data. Note that the encoding is not UTF8 for all websites so it might not produce the correct output always.
You can easily find these methods by browsing the online documentation: http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html
Related
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
We are trying to add in functionality into our app to allow it to POST a large file approx 50kb to our web service the file itself is a HTML template, however with the code below what we are finding is that the data seems to get cut off when the web service saves it.
The web service is currently designed to check the $_POST['html'] variable and write it to a file.
Is there a better way to do this and does anyone have any idea why the upload is not complete?
Thanks Aaron
NSString *myText;
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"template" ofType:#"htm"];
if (filePath) {
myText = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
}
NSURL *URL = [NSURL URLWithString:#"http://mywebsiteurl.com/receiveData.php"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
request.HTTPMethod = #"POST";
NSString *params = [NSString stringWithFormat:#"html=%#", myText];
NSData *data = [params dataUsingEncoding:NSASCIIStringEncoding];
[request addValue:#"8bit" forHTTPHeaderField:#"Content-Transfer-Encoding"];
[request addValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request addValue:[NSString stringWithFormat:#"%i", [data length]] forHTTPHeaderField:#"Content-Length"];
[NSURLConnection connectionWithRequest:[request autorelease] delegate:self];
I think it is because your Server set the post limit.Check the settings at your server side about the post data limit.
When I rechecked this question, I think maybe I found what was the problem. When I do HTTP post, I usually don't set the content-length by myself. I just encode my post data as key=value&.. form and use the [NSMutableURLRequest setHTTPBody:data] method to add the data to the NSMutableURLRequest. I think it will do the rest for you include set the content-length for you. Even though I am not very familiar with HTTP protocol, but I think maybe the content-length represent the whole post data length, but here you set the content-length value with the length of key value data length.
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.
Searching the web for some method to send POST requests in Objective-C, I came up with some solutions.
That's what I've got:
responseData = [NSMutableData new];
NSURL *url = [NSURL URLWithString:#"http://mydomain.com/page.php?"];
NSString *myParameters = [[NSString alloc] initWithFormat:#"str=hello"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:[myParameters dataUsingEncoding:NSUTF8StringEncoding]];
The response I receive is an error, because the POST variable "str" hasn't been set.
What am I doing wrong?
You will have to:
set the content type header of the request ("application/x-www-form-urlencoded"). You can set the header by using the setValue:forHTTPHeaderField: method of an NSMutableURLRequest instance.
make sure, that the body actually is actually "Form URL encoded". The example you give looks good, but if you add other parameters, or parameter values containing special characters, make sure, that these are properly encoded. See CFURLCreateStringByAddingPercentEscapes.
It looks like your parameters are intended to be URL parameters (typically in name1=value1&name2=value2 form). You usually don't want to put them in the HTTP body like you are currently doing. Instead, append them to your URL:
NSString *requestStr = #"hello";
NSString urlString = [NSString stringWithFormat:#"http://mydomain.com/page.php?str=%#", requestStr];
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest doesn't provide a more generic way to do this, although you can look at this SO question and its answers for ideas on how many people deal with this kind of requirement. There are also free and/or open source libraries out there that aim to make this kind of request easier to code.
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!