Alright, so here's where I'm at with my app.
I've got some code that connects to a remote server and grabs some XML data, and forms it into a string. Here is the code below:
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:#"GET"];
NSString *accept = [NSString stringWithFormat:#"application/xml"];
[request addValue:accept forHTTPHeaderField: #"Accept"];
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString* responseString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];
NSLog(#"%#",responseString);
Which returns
That's exactly the information I want. My question is how I can get the double value out of the gold brackets and into my application to use.
Thanks a lot!
There are a lot of tutorials of how to use NSXMLParser. For example, ray wenderlich or here and here.
There's quite a few XML parsing options available - ranging from libxml2, to NSXMLParser and a host of open-source projects.
One of my favorite XML parsers is RaptureXML, which can be installed via CocoaPods.
I like to create a category on RXMLElement to parse as follows:
- (PFCurrentConditions*)asCurrentCondition
{
NSString* summary = [[self child:#"weatherDesc"] text];
PFTemperature* temp = [PFTemperature temperatureWithFahrenheitString:[[self child:#"temp_F"] text]];
NSString* humidity = [[self child:#"humidity"] text];
NSString* wind =
[NSString stringWithFormat:#"Wind: %# km %#", [[self child:#"windspeedKmph"] text], [[self child:#"winddir16Point"] text]];
NSString* imageUri = [[self child:#"weatherIconUrl"] text];
return [PFCurrentConditions conditionsWithSummary:summary temperature:temp humidity:humidity wind:wind imageUrl:imageUri];
}
So, you can then use it as follows:
RXMLElement* rootElement = [RXMLElement elementFromXMLData:response.responseData];
__autoreleasing PFWeatherReport* weatherReport = [rootElement asWeatherReport];
Again, this is one of countless options, but my personal favorite.
Related
I send some credentials to a web-service.
I can get the responce as NSData or as an NSString.
Whats the simpleist way to convert the (NSData or NSString)JSON to a NSDictionary so I can process it?
Building for iOS4.3
Many Thanks,
-Code
From iOS 5.0 and on you can use NSJSONSerialization, docs here.
There is a good tutorial on how to use it, here.
Download SBJsonParser Framework using the link, http://github.com/stig/json-framework/downloads and add required classes to your project (SBJsonParser.h).
Import SBJsonParser.h and use the following code,
SBJsonParser *parser = [[SBJsonParser alloc] init];
//dictionary with name,id
NSDictionary *jsonObject = [parser objectWithString:jsonString error:NULL];
//name array
NSMutableArray *nameArray = [[NSMutableArray alloc]init];
for (NSMutableDictionary *dic in jsonObject){
[nameArray addObject:[dic valueForKey:#"name"]];
}
Use this :
NSString *urlString = [NSString stringWithFormat:kURLString,self.chapter,self.page];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];
[urlRequest setHTTPMethod:#"POST"];
[urlRequest setHTTPBody:[urlString dataUsingEncoding:NSISOLatin1StringEncoding]];
NSData* responseData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:nil error:nil];
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSISOLatin1StringEncoding];
NSDictionary* result = [(NSDictionary*)[responseString JSONValue] objectForKey:#"Result"];
I use SBJson
NSArray *arrObj = (NSArray*)[[JsonParser sharedJsonParser] getObjectsFromJsonString:responseString];
response string is a JSON string here
I have a EMR app and i want that i may send the data which i have collected like images and voice to server. in data base so how can i do this . Is there any way to send these data to server through post method.
Here is an example of a HTTP Post request
// define your form fields here:
NSString *content = #"field1=42&field2=Hello";
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#"http://www.example.com/form.php"]];
[urlRequest setHTTPMethod:#"POST"];
[urlRequest setHTTPBody:[content dataUsingEncoding:NSISOLatin1StringEncoding]];
// generates an autoreleased NSURLConnection
[NSURLConnection connectionWithRequest:request delegate:self];
Might want to reference http://developer.apple.com/library/ios/#documentation/cocoa/reference/foundation/Classes/NSURLConnection_Class/Reference/Reference.html
This tutorial is also helpful http://www.raywenderlich.com/2965/how-to-write-an-ios-app-that-uses-a-web-service
In that case, you can do follow two ways:
1. if you strictly like to using POST (i like), u can using cocoahttpserver project:
https://github.com/robbiehanson/CocoaHTTPServer
In iphone app, you can do this code to send POST request:
-(NSDictionary *) getJSONAnswerForFunctionVersionTwo:(NSString *)function
withJSONRequest:(NSMutableDictionary *)request;
{
[self updateUIwithMessage:#"server download is started" withObjectID:nil withLatestMessage:NO error:NO];
NSDictionary *finalResultAlloc = [[NSMutableDictionary alloc] init];
#autoreleasepool {
NSError *error = nil;
NSString *jsonStringForReturn = [request JSONStringWithOptions:JKSerializeOptionNone serializeUnsupportedClassesUsingBlock:nil error:&error];
if (error) NSLog(#"CLIENT CONTROLLER: json decoding error:%# in function:%#",[error localizedDescription],function);
NSData *bodyData = [jsonStringForReturn dataUsingEncoding:NSUTF8StringEncoding];
NSData *dataForBody = [[[NSData alloc] initWithData:bodyData] autorelease];
//NSLog(#"CLIENT CONTROLLER: string lenght is:%# bytes",[NSNumber numberWithUnsignedInteger:[dataForBody length]]);
NSString *functionString = [NSString stringWithFormat:#"/%#",function];
NSURL *urlForRequest = [NSURL URLWithString:functionString relativeToURL:mainServer];
NSMutableURLRequest *requestToServer = [NSMutableURLRequest requestWithURL:urlForRequest];
[requestToServer setHTTPMethod:#"POST"];
[requestToServer setHTTPBody:dataForBody];
[requestToServer setTimeoutInterval:600];
[NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[urlForRequest host]];
NSData *receivedResult = [NSURLConnection sendSynchronousRequest:requestToServer returningResponse:nil error:&error];
if (error) {
NSLog(#"CLIENT CONTROLLER: getJSON answer error download:%#",[error localizedDescription]);
[self updateUIwithMessage:[error localizedDescription] withObjectID:nil withLatestMessage:YES error:NO];
[finalResultAlloc release];
return nil;
}
NSString *answer = [[NSString alloc] initWithData:receivedResult encoding:NSUTF8StringEncoding];
JSONDecoder *jkitDecoder = [JSONDecoder decoder];
NSDictionary *finalResult = [jkitDecoder objectWithUTF8String:(const unsigned char *)[answer UTF8String] length:[answer length] error:&error];
[finalResultAlloc setValuesForKeysWithDictionary:finalResult];
[answer release];
[self updateUIwithMessage:#"server download is finished" withObjectID:nil withLatestMessage:NO error:NO];
if (error) NSLog(#"CLIENT CONTROLLER: getJSON answer failed to decode answer with error:%#",[error localizedDescription]);
}
NSDictionary *finalResultToReturn = [NSDictionary dictionaryWithDictionary:finalResultAlloc];
[finalResultAlloc release];
return finalResultToReturn;
}
Don't forget to pack attributes with images to base64.
Finally, if u don't like to keep data, which u send in you mac app, u can send to u database using any database C api. I recommend to using core data to save receive data.
I have an iPhone app which sends a request to a url posting a variable called submit:
+(NSMutableArray*)getQuestions:(NSString*)section from: (NSString*) url{
NSMutableArray *questions = [[NSMutableArray alloc] init];
//connect to database given by url
//NSError *error = nil;
//NSURLResponse *response = nil;
NSMutableString* myRequestString = [[NSMutableString string]initWithFormat:#"section=%#", section];
NSData *myRequestData = [NSData dataWithBytes: [myRequestString UTF8String] length: [myRequestString length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: url]];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"content-type"];
[request setHTTPMethod: #"POST"];
//post section
[request setHTTPBody: myRequestData];
//store them in the array;
return [questions autorelease];
}
My php file:
<?php
//connect to database
function connect() {
$dbh = mysql_connect ("localhost", "abc1", "12345") or die ('I cannot connect to the database because: ' . mysql_error());
mysql_select_db("PDS", $dbh);
return $dbh;
}
//store posted data
if(isset($_POST['section'])){
$dbh = connect();
$section = $_POST['section'];
$query = mysql_query("SELECT * FROM QUESTIONS WHERE sectionId = $section;") or die("Error: " . mysql_error());;
$rows = array();
while($r = mysql_fetch_assoc($query)) {
$rows[] = $r;
}
echo '{"questions":'.json_encode($rows).'}';
mysql_close();
}
?>
I have built a model class (Question) in objective c which has the exact properties that each row element has in the rows associative array.
My questions are:
1) How can I read the echo'd JSON array elements and their relative attributes in objective C?
2) How can I create an array of Question objects and map each one to an element in the rows array?
3) What do I have to write in my method "+(NSMutableArray*)getQuestions:(NSString*)section from: (NSString*) url" to capture the reply from the php (the echo)?
EDIT:
Here is the output of the php:
http://dev.speechlink.co.uk/David/get_questionstest.php
UPDATE
Changed method to use ASIHTTPRequest - Cannot deserialise JSON string:
//method to
+(NSDictionary*)getQuestions:(NSString*)sectionId from: (NSString*) url{
NSDictionary *questions;
NSURL *link = [NSURL URLWithString:url];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:link];
[request setPostValue:sectionId forKey:#"section"];
NSError *error = [request error];
[request startAsynchronous];
if (!error) {
//NSString *response = [request responseString];
//store them in the dictionary
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
NSString *json = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
questions = [json objectFromJSONString];
NSLog(#"Data: %#", questions); //outputs Data: (null)
[json release];
[request release];
}else{
//UIAlertView to warn users there was an error
}
return questions;
}
Well, lets go through this one step at a time.
You can create a NSDictionary from JSON quite easily by using one of several different JSON parsing libraries. I really enjoy using JSONKit. Once you've imported JSONKit, into your project, you can do something like this:
NSString *url = #"http://dev.speechlink.co.uk/David/get_questionstest.php";
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
NSString *json = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSDictionary *questions = [json objectFromJSONString];
[json release];
Now you have an array filled with the questions in your example. Now you can loop through this array and fill your data with the data in the array. Now lets be practical. It would be easier if you just had to manage one object instead of four for each question, wouldn't it? Lets make a class that contains one question each instance.
Interface:
#interface Question : NSObject {
NSString *questionId;
NSString *question;
NSString *questionNumber;
NSString *sectionId;
}
#property(copy)NSString *questionID;
#property(copy)NSString *question;
#property(copy)NSString *questionNumber;
#property(copy)NSString *sectionId;
#end
And implementation:
#implementation Question
#synthesize questionId, question, questionNumber, sectionID;
#end
Now that's just a basic example. Nothing fancy. Now you can loop through the array you had before and create "question" objects that contain each question's data. For my purposes, suppose you have a NSMutableArray named questionsArray that contain the questions you want to use. We'll loop through the dictionary and add the questions from the dictionary into the questionsArray array.
for (NSDictionary *q in questions) {
/* Create our Question object and populate it */
Question *question = [[Question alloc]init];
question.questionId = [q objectForKey:#"questionId"];
question.question = [q objectForKey:#"question"];
question.questionNumber = [q objectForKey:#"questionNumber"];
question.sectionId = [q objectForKey:#"sectionId"];
/* Add it to our question (mutable) array */
[questionsArray addObject:question];
[question release];
}
Tada! Now you have an array filled with Question objects. Any time you want to look at a property on any of the question objects, you can just simply access that property. For example, to grab the first question's number, you can just do this:
NSString *q1Number = [questionsArray objectAtIndex:0].questionNumber;
Please note this is all untested, as I don't have my compiler with me. It should get you started, though. =)
Edit: You were doing your request completely wrong. Try this:
+(NSDictionary*)getQuestions:(NSString*)sectionId from: (NSString*) url{
NSDictionary *questions = nil;
NSURL *link = [NSURL URLWithString:url];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:link];
[request setPostValue:sectionId forKey:#"section"];
NSError *error = [request error];
[request startSynchronous];
if (!error) {
NSData *response = [request responseData];
NSString *json = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
questions = [json objectFromJSONString];
[json release];
} else{
//UIAlertView to warn users there was an error
}
[request release];
return questions;
Take a look at Stig Brautaset's excellent JSON parser at GitHub.
And there are even a couple of sample projects included.
From your PHP, one would expect the parser to produce and array of NSDictionary objects. I'm not sure what you mean by question 2, but you can then iterate through the array and create custom "Question" objects with the NSDictionary values.
Hope this helps.
Didn't see that you added a third question. This is answered in the "TweetStream" example above. I would suggest that you use the NSURLConnectionDelegate methods as described by Apple.
Sorry for my english ^^
I would know how I can have a result from the google converter tool for currency, available on http://www.google.com/finance/converter?a=1&from=USD&to=GBP for example.
I have already tried something like that :
-(IBAction)getResponse:(id) sender{
NSString *myURLString = #"http://www.google.com/finance/converter?a=1&from=USD&to=GBP";
NSURL *myURL = [NSURL URLWithString: myURLString];
NSData *data = [NSData alloc];
data=[NSData dataWithContentsOfURL:myURL];
if(data!=nil && data != ""){
NSString *response = [[[NSString alloc] initWithData:data]]
[label setText: response];
}
else [label setText:#"not working"];
}
But when I click on my button, the label does not have a text (it is like it is empty).
Am I doing something wrong ?
Is it possible what I want to do ?
Thank you very much for your futures answers !
Olivier.
Yeah.. It is possible...
See the data that you are getting is an HTML file or can be treated as xml. Just parse that xml file and get the result. There ia lot of things in that file but you have to only extract
<div id=currency_converter_result>1 USD = <span class=bld>0.6118 GBP</span>
Hey try this URL
http://www.google.com/ig/calculator?hl=en&q=1USD=?INR
This URL will return the JSON
{lhs: "1 U.S. dollar",rhs: "44.5097254 Indian rupees",error: "",icc: true}
Just parse it. :)
Try...
NSData *data = [[NSData alloc] init];
Then check you've got something in response
NSLog(#"%#", response);
Better yet, remove the NSData alloc/init
Replace with
NSData *data=[NSData dataWithContentsOfURL:myURL];
And, you'll need to parse the return result, because you're not going to get back what you expect. Response will contain HTML page.
You better use an asynchronous request to avoid blocking your app. Easy using ASIHTTPRequest:
- (IBAction)grabURLInBackground:(id)sender
{
NSURL *url = [NSURL URLWithString:#"http://www.google.com/finance/converter?a=1&from=USD&to=GBP"];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDelegate:self];
[request startAsynchronous];
}
- (void)requestFinished:(ASIHTTPRequest *)request
{
// Use when fetching text data
NSString *responseString = [request responseString];
[label setText: responseString];
}
- (void)requestFailed:(ASIHTTPRequest *)request
{
NSError *error = [request error]; //you can log the error description
[label setText:#"not working"];
}
NSString *myURLString = #"http://www.google.com/finance/converter?a=1&from=USD&to=GBP";
NSURL *myURL = [NSURL URLWithString: myURLString];
NSData *data = [NSData alloc];
data=[NSData dataWithContentsOfURL:myURL];
if(data!=nil){
NSString *response = [[NSString alloc] initWithData:data encoding:NSISOLatin1StringEncoding];
NSLog(#"%#",response);
}
Try this.
This API is giving HTML responce.
My iphone app called Google Local Search(non javascript version) to behave some search business.
Below is my code to form a url:
NSString *url = [NSString stringWithFormat:#"http://ajax.googleapis.com/ajax/services/search/local?v=1.0&q=%#", keyword];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:url]];
[request setHTTPMethod:#"GET"];
//get response
NSHTTPURLResponse* urlResponse = nil;
NSError *error = [[[NSError alloc] init] autorelease];
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];
NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
When the keyword refers to english characters, it works fine, but when refers to chinese characters(encoded in UTF8, such as '天安门' whose UTF8 code is 'e5a4a9 e5ae89 e997a8'), it will report NSURLErrorBadURL error(-1000, Returned when a URL is sufficiently malformed that a URL request cannot be initiated). Why?
Then I carry out further investigation, I use Safari and type in the url below:
http://ajax.googleapis.com/ajax/services/search/local?v=1.0&q=天安门
It also works, and the output I got from Macsniffer is:
/ajax/services/search/local?v=1.0&q=%E5%A4%A9%E5%AE%89%E9%97%A8
So I write a testing url directly in my app
NSString *url = [NSString stringWithFormat:#"http://ajax.googleapis.com/ajax/services/search/local?v=1.0&q=%E5%A4%A9%E5%AE%89%E9%97%A8"];
And what I got from the Macsniffer is some other thing:
/ajax/services/search/local?v=1.0&q=1.687891E-28750X1.417C0001416CP-102640X1.4CC2D04648FBP-9999-1.989891E+0050X1.20DC00184CC67P-953E8E99A8
It seems my keyword "%E5%A4%A9%E5%AE%89%E9%97%A8" was translated into something else. So how can I form a valid url? I do need help!
Have you tried encoding the search string:
NSString* escapedKeyword = [keyword stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];