I am trying to parse an HTML page, but the page requires a username/password to access the data.
How do I pass the credentials to the server so I can load the webpage into my NSData object?
UPDATE for Comments Below
Normally if you are using a web browser, it will pop up a login window for you to type in the credentials. When I execute it in iOS, it doesn't give me anything.
Thanks a lot!
Alan
You can use ASIFormDataRequest. Take a look at it here
NSURL *tempUrl = [NSURL URLWithString:#"http://www.yoursitetoparse.com"];
ASIFormDataRequest *request = [[ASIFormDataRequest alloc] init];
request = [ASIFormDataRequest requestWithURL:tempUrl];
[request setDelegate:self];
[request setRequestMethod:#"POST"];
[request setUsername:#"username"]; //Username
[request setPassword:#"password"]; //Password
[request startAsynchronous];
And it's delegate methods:
-(void)requestFailed:(ASIHTTPRequest *)request
{
NSError *error = [request error];
NSLog(#"Failed %# with code %d and with userInfo %#",[error domain],[error code],[error userInfo]);
}
-(void)requestFinished:(ASIHTTPRequest *)request
{
NSLog(#"Finished : %#",[theRequest responseString]);
}
Related
I'm looking to create a simple iOS app that displays the current water level of a local lake. The water level is updated daily on a specific URL. Is it possible to pull content from a webpage using objective c?
Sure. Check out the URL Loading System Programming Guide. From that link:
The URL loading system provides support for accessing resources using the following protocols:
File Transfer Protocol (ftp://)
Hypertext Transfer Protocol (http://)
Secure 128-bit Hypertext Transfer Protocol (https://)
Local file URLs (file:///)
Absolutely! Use the NSURLConnection object. Use something like the function below, just pass an empty string for 'data' and then parse the HTML returned to find the value you're looking for.
-(void)sendData:(NSString*)data toServer:(NSString*)url{
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
NSData *postData = [data dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%d",[postData length]];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:url]];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Current-Type"];
[request setHTTPBody:postData];
NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];
if(conn){
//Connection successful
}
else{
//Connection Failed
}
[conn release];
}
Easier way yet using threading:
- (void)viewDidLoad
{
[self contentsOfWebPage:[NSURL URLWithString:#"http://google.com"] callback:^(NSString *contents) {
NSLog(#"Contents of webpage => %#", contents);
}];
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void) contentsOfWebPage:(NSURL *) _url callback:(void (^) (NSString *contents)) _callback {
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
dispatch_async(queue, ^{
NSData *data = [NSData dataWithContentsOfURL:_url];
dispatch_sync(dispatch_get_main_queue(), ^{
_callback([[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
});
});
}
I am trying to write an iPhone app in Objective-C. I need to POST data using NSURLConnection. Every example I can find deals with JSON; I do not need to use JSON. All I need to do is POST the data and get a simple 1 or 0 (succeed or fail) from a PHP script. Nothing more.
I came across this code but I am not sure how to use it or modify it to not use JSON:
- (void)performRequest {
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#"http://someplace.com/"]];
[request setValue:#"Some Value" forHTTPHeaderField:#"Some-Header"];
[request setHTTPBody:#"{\"add_json\":\"here\"}"];
[request setHTTPMethod:#"POST"];
[NSURLConnection connectionWithRequest:[request autorelease] delegate:self];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
// Fail..
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
// Request performed.
}
Here's how to create an ordinary post.
First create a request of the right type:
NSURL *URL = [NSURL URLWithString:#"http://example.com/somepath"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
request.HTTPMethod = #"POST";
Now format your post data as a URL-encoded string, like this:
NSString *params = #"param1=value1¶m2=value2&etc...";
Remember to encode the individual parameters using percent encoding. You can't entirely rely on the NSString stringByAddingPercentEscapesUsingEncoding method for this (google to find out why) but it's a good start.
Now we add the post data to your request:
NSData *data = [params dataUsingEncoding:NSUTF8StringEncoding];
[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"];
[request setHTTPBody:data];
And that's it, now just send your request as normal using NSURLConnection (or whatever).
To interpret the response that comes back, see Maudicus's answer.
You can use the following NSURLConnection method if you target ios 2.0 - 4.3 (It seems to be deprecated in ios 5)
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSString * string = [[NSString alloc] initWithData:data encoding:
NSASCIIStringEncoding];
if (string.intValue == 1) {
} else {
}
}
I've a very similar situation to whitebreadb. I'm not disagreeing with the answers submitted and accepted but would like to post my own as the code provided here didn't work for me (my PHP script reported the submitted parameter as a zero-length string) but I did find this question that helped.
I used this to perform a posting to my PHP script:
NSURL *URL = [NSURL URLWithString:[NSString stringWithFormat:#"http://www.myphpscriptlocation.net/index.php?userID=%#",self.userID_field.stringValue]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
request.HTTPMethod = #"POST";
NSURLConnection *c = [NSURLConnection connectionWithRequest:request delegate:self];
I used the asihttp library to connect to twitter.
The idea is to send a login request, get the response and extract the session ID/auth code from the response's cookie header. Then you can use that session ID/auth code for consecutive calls.
I don't obtain the auth_code because the authentication fails. how can I fix this?
the code is below:
- (void) login {
NSString *username = #"user";
NSString *password = #"pass";
NSURL *url = [NSURL URLWithString:#"https://twitter.com/sessions?phx=1"];
ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithURL:url] autorelease];
[request addRequestHeader:#"User-Agent" value: #"ASIHTTPRequest"];
[request setPostValue:username forKey:#"session[username_or_email]"];
[request setPostValue:password forKey:#"session[password]"];
[request setDelegate: self];
[request setDidFailSelector: #selector(loginRequestFailed:)];
[request setDidFinishSelector: #selector(loginRequestFinished:)];
[request startAsynchronous];
}
- (void)loginRequestFailed:(ASIHTTPRequest *)request {
NSError *error = [request error];
NSLog(#"login request failed with error: %#", [error localizedDescription]);
}
- (void)loginRequestFinished:(ASIHTTPRequest *)request {
NSString *responseString = [[request responseHeaders] objectForKey:#"Set-Cookie"];
NSLog(#"%#",responseString);
}
I tried to connect from shell and it works.
curl -d 'session[user_or_emai]=user&session[password]=pass' https://twitter.com/sessions
Don't scrape twitter.com. It will end with you getting suspended. Instead use the approved API to integrate with Twitter. You can read about how authentication works with Twitter's API, how you can use xAuth to jumpstart authentication with a users password, and the open source code to help get you started.
I have a NSURLConnection which is a post to the server, but I expect it to return some small data, whether it was successful or not.
-(void)submitPost:(NSString *)xml
{
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[service generateURL]];
NSString *result = (NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)xml, NULL, CFSTR("?=&+"), kCFStringEncodingUTF8);
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:[result dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPMethod:#"POST"];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];
if(theConnection)
{
NSLog(#"Connection success");
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[theConnection retain];
failed = NO;
}
else
{
NSLog(#"Connection failed");
}
}
The problem is, not only does it send a post the URL, it also sends a GET, and the GET response is returned as the data... I'm a bit confused. I checked my wireshark output, and it's definitely making both a post and a get.
What do you guys think?
Does the URL respond to a POST with redirect? You can implement the NSURLConnection delegate method connection:willSendRequest:redirectResponse: to see if that's the case (and to cancel an unwanted redirect).
I have to send get or post request to localhost:
<?php
if(#$_GET['option']) {
echo "You said \"{$_GET['option']}\"";
}else if(#$_POST['option']) {
echo "You said \"{$_POST['option']}\"";
}
?>
ive using this code:
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://localhost/wsh/index.php?option=Hello"]];
NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *get = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
it works, but one time in code. if ill do it another one time, application has terminate.
Im try to use ASIFormDataRequest:
ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithURL:#"http://localhost/wsh/index.php"] autorelease];
[request setPostValue:#"option" forKey:#"myFormField1"];
[request start];
NSError *error = [request error];
if (!error) {
NSString *response = [request responseString];
NSLog(response);
}else{
NSLog(#"error");
}
it says:
2010-01-07 13:20:34.964 WSH[3351:903] -[NSCFString absoluteURL]: unrecognized selector sent to instance 0x160f8
2010-01-07 13:20:34.966 WSH[3351:903] error
sry for my english
You are using a plain NSString literal where an NSURL object is expected: [...] initWithURL:#"http://localhost/wsh/index.php" [...]
Change this to initWithURL:[NSURL URLWithString:#"http://localhost/wsh/index.php"].
I wonder if also you should switch the value and key for the post values, ie change the line
[request setPostValue:#"option" forKey:#"myFormField1"];
to
[request setPostValue:#"myFormField1" forKey:#"option"];