This is a tough question.
When I press on the button, it is supposed to connect to a URL, which will initiate that method of my wcf service. However, when I debug, I noticed that the connection fails (like none of the delegate methods are called and stuff). I know that my WCF service works because when i type the URL in safari directly, it works perfectly, and performs that method. Here is my code:
- (IBAction)RBCButtonPressed:(id)sender {
//[[UIApplication sharedApplication] openURL:[NSURL URLWithString: #"http://10.1.51.55:8732/windows2/OnApplication?appName=RoyalBank.BankOfTheFuture.Surface.exe&directory=C:\\Program Files (x86)\\Bank of the Future"]];
NSString *urlString = #"http://10.1.51.55:8732/windows2/OnApplication?appName=RoyalBank.BankOfTheFuture.Surface.exe&directory=C:\\Program Files (x86)\\Bank of the Future";
NSLog(urlString);
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url ];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection release];
[request release];
if(connection)
self.valueReturned = [[NSData data] retain];
else
NSLog(#"data failed");
NSLog(#"connection failed");
[captureView addSubview:loader];
}
I'm not including the delegate methods cause they aren't called anyway.
It prints "connection failed."
UPDATE: When I use a method that takes in only one parameter, it works fine from both the browser and the device (the connection succeeds and the delegate methods are called). However, when there are two parameters, it works fine only from the browser. The connection always fails.
Possibilities - the use of the backslash confuses it somehow (?).
This is urgent and any help would be greatly appreciated.
EDIT: It will always print "connection failed" I realize, but I know that the connection fails because 1) the delegate methods aren't called and 2)the application does not turn on, which it will if the method is called.
If you check your NSURL object in the debugger, you'll find it's nil immediately after you try to initialize it. This is because it's malformed. Try URL encoding it first.
Notice the URL you pasted into safari changes to this:
http://10.1.51.55:8732/windows2/OnApplication?appName=RoyalBank.BankOfTheFuture.Surface.exe&directory=C:%5C%5CProgram%20Files%20(x86)%5C%5CBank%20of%20the%20Future
See all the %20s and %5Cs, etc.? That's because safari URL encodes it before sending the request. You must do the same.
Best regards.
It's failing because you are releasing connection right after you create it. If you're not using ARC, you could create it with autorelease, or just use ARC and forget about the releases.
Related
I am using ASIHTTPRequest (I know, I know, it is not being maintained - that doesn't matter; it works and it is what my app is built on) to run a series of HTTP requests through ASINetworkQueue.
The problem is that my queue will have many requests (thousands), and it will take a while to run. In the time that it is running, some of the data in the app may have changed which would make some of the request unnecessary. I would like to run a validation method on each request right before it runs, and if the validation method does not check out, then it will cancel that request and go on to the next one.
Right now, I am using the following code to create my ASIHTTPRequests:
ASINetworkQueue *myQueue = [ASINetworkQueue queue];
NSURL *URL = [NSURL URLWithString:#"http://mywebsite.com"];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setStartedBlock:^{
NSLog(#"Request started: %#", request.url.absoluteString);
}];
[request setCompletionBlock:^{
NSLog(#"Request completed: %#", request.url.absoluteString);
// do some code here to clean up since it's finished
}];
[myQueue addOperation:request];
My current thinking is to put something into the startedBlock, so it would do:
[request setStartedBlock:^{
NSLog(#"Request started");
if (![self myValidationMethod]) {
[request cancel]; // <----------
}
}];
However when I do this, I get the following warning from Xcode:
"Capturing 'request' strongly in this block is likely to lead to a retain cycle."
First, is this the right method to go about doing this? I can't seem to find a way to remove a specific ASIHTTPRequest from an ASINetworkQueue. Second, is this warning from Xcode something that I will need to worry about?
About the warning you capture the blocks 'container' and form a cycle... just say:
__weak ASIHTTPRequest *rw = request;
and use that in the block.
as for the started block approach. doesnt sound perfect to me but I dont know a better approach...
NSURLRequest delegate methods are not getting called when i run the application on the device. It works perfectly on the simulator though. Also its not the case of my view loading before the request is fulfilled because i enable to view to be loaded only once the connection has received the data.
My code requesting url is here. Any help greatly appreciated.
- (void)viewWillAppear:(BOOL)animated
{
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"http://-dev01x/content"]; cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:60];
[request setHTTPMethod:#"GET"];
_getData = [[NSURLConnection alloc] initWithRequest:request delegate:self];
NSLog(#"HELLO %#",_getData);
}
Your code as provided here makes no sense:
_getData = [[NSURLConnection alloc] initWithRequest:request delegate:self];
That line returns a pointer to a NSURLConnection object, your variable name is misleading. If you want to block at this point (and does that even work) then it would appear you need to use sendSynchronousRequest at that point.
I do something similar to what you want to do, but in a more traditional way. In viewDidLoad or even in the initWithFrame, I will start up an asynchronous connection, set a flag, and set the view backgroundColor to black or white (I use a spinner too normally). When I get viewWillAppear, if the connection has completed, all is well and I set the various UI elements. If not, then don't do anything, and later, when the connection completes, pull down the spinner and update the UI.
The only way I can think of to block the main thread at the point you are trying to would be to use that synchronous request (which IMHO is a really bad way to deal with this).
The beauty of doing things in the background is that if its taking too long, the user can tap the back button or go somewhere else in the app [in which case you cancel the connection and tear everything down.]
Check url u provide to NSMutableURLRequest when checked in browser gives nothing
NSMutableURLRequest needs valid url
I am having problems in my iphone application due to weak wifi signals. My application uses webservice to retireve data from our server but when Wifi signals are weak the response never comes back and user gets stuck on "Loading..." overlay screen. Finally the application crashes at the end. How can i handle this situation gracefully. Is there a way to set TimeOut for my webservice calls or something like this?
Thanks, Asif.
try to use ASIHTTP lib
http://allseeing-i.com/ASIHTTPRequest/How-to-use
You might want to learn about ASIHTTPRequest as it features much more than the standard CFNetwork api. The code is straight forward, error handling as well:
- (IBAction)grabURLInBackground:(id)sender
{
NSURL *url = [NSURL URLWithString:#"http://allseeing-i.com"];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDelegate:self];
[request startAsynchronous];
}
- (void)requestFinished:(ASIHTTPRequest *)request
{
// Use when fetching text data
NSString *responseString = [request responseString];
// Use when fetching binary data
NSData *responseData = [request responseData];
}
- (void)requestFailed:(ASIHTTPRequest *)request
{
NSError *error = [request error];
}
You can set the NSURLConnection timeout and a delegate to respond to connection:didFailWithError: selector. See this S.O. topic.
if your delegate is never being called, this is a somehow known issue.
The only workaround seems to be setting your own NSTimer to fire after some time and cancel the request. It is definitely awkard, but it should not be that complex.
If you are curious about the reason behind the issue with timeout, it seems to be related to the slow starting of the 3G subsystem in an iPhone.
i have one simple question, if i'm using ASIFormDataRequest when i need to release the request object?
NSURL *url = [NSURL URLWithString:#"url"];
ASIFormDataRequest *requestForm = [ASIFormDataRequest requestWithURL:url];
[requestForm addPostValue:[[NSUserDefaults standardUserDefaults] stringForKey:#"user"] forKey:#"user"];
[requestForm setRequestMethod:#"POST"];
[requestForm setDelegate:self];
[requestForm startAsynchronous];
Thanks
You need to remember that you are always responsible for releasing an object if the method from which you receive it contains new, copy, or init.
In this case, you don't need to release it. The ASIHTTPRequest class autoreleases it for you.
A quick search in the implementation file shows that it'll be autoreleased.
+ (id)requestWithURL:(NSURL *)newURL
{
return [[[self alloc] initWithURL:newURL] autorelease];
}
Your request is autoreleased in your code, so you don't need to release it (as others have said).
However, you are starting an asynchronous request - it'll complete/fail sometime in the future, and if it is associated with other objects which will get freed when the view exits you're potentially leaving yourself open to a crash. So I'd suggest you would want to make requestForm a property of your class (so when you assign the request to self.requestForm it will get retained for you), and explicitly release & nil it when the request completes.
If it's a very simple app with just one view you may get away without that though.
First of all, sorry for my posibly bad english...
I got a surely big stupid question...
In my enterprise have an automatic door system, that is opened with a HTTP GET request to a file.
Example:
http://ipaddress/rc.cgi?o=1,50
Where the o=number indicates the amount of seconds that the automatic door will run.
The is no need for authentification or nothing (that is made by LAN Radius).
So, the question is...
How can I make a single button (for example in the springboard) that when you touch it, runs the GET request?
You thing that it should be possible with NSURLConection ?
Thanks for all
I'm not sure if this is the best way of going about it, but this is how I've achieved something similar in my own app. Just create a new NSData object that hits the required URL, then release it if you don't need to do anything with the returned data:
NSURL *theURL = [[NSURL alloc] initWithString:#"http://ipaddress/rc.cgi?o=1,50"];
NSData *theData = [[NSData alloc] initWithContentsOfURL:theURL];
[theData release];
[theURL release];
Or just create an NSURLConnection to run asynchronously, then you don't have to worry about the UI hanging and if the delegate is set to nil, you can pretty much forget about it after you've run it.
NSURL * url = [NSURL URLWithString:#"http://ipaddress/rc.cgi?o=1,50"];
NSMutableURLRequest * request = [[NSMutableURLRequest alloc] initWithURL:url];
NSURLConnection * theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:nil];
[request release];
[theConnection release];