Suppose I have a application which fetch data from network and then showing those data in application. But sometimes internet becomes disconnected so I am showing message that 'Internet not available'. But I want to keep user busy with the application. So I want to do following things but there are some problem in implementation.
1) When network disconnected I want to show message 'network disconnect' and I want to store all data in db.
Problem: How will I know network is not available without happening any event?
2) And when network is connected I want to fetch data and store in buffer.
Problem : Same, how will I know network is available rightnow?
This is quite common question and is best solved using Reachability class.
You can find a nice manual here: Testing Network Reachability
And a quick answer is the accepted answer here:
iPhone reachability checking
But be aware that it's best to check for host availabiility. I tested this code when device was connected to AdHoc WiFi (with no internet connectivity) and the result was: internet available via WiFi. So if you want to be sure - use host status.
EDIT: and this is probably the best example on SO (answer from iWasRobbed):
How to check for an active Internet connection on iOS or OSX?
Related
I am trying to find out what is the best way check internet connectivity in tizen. Although there is a connection manager I can think of a scenerio where it would not work. Suppose the device is connected to wifi but wifi is not connected to internet. What is the best best way to resolve this issue? I am thinking of using getaddrinfo? But would not that resolve to IP using cached value. Then should I connect to a known website (e.g. google although some country might block it)?
You can hit an address and check for response for certain time of interval. If there is no response for say 2 min or so then you can show message to user that there is some problem with Internet connection.
i need to Implement in my app Error report. i have already have this error report but the problem is that i use the grabURLInBackground to send the error and it's not a good Idea because i need to save those error's in array and ONLY when i have connection with the server i need to send all of those error's together. so my Question is how do i "listen" to a server connection?
how can i know when to send my error's ( Connection is Available ) ? do i need to do it in background? with what?
i hope you guy's Understood me :)
You will get a lot of example code code with Reachability. In fact you can google it.
I didn't found a solution which completely works for me as desired.
Here is a similar question, maybe.
And here is my test cases:
Connect your device to a WI-FI router, and unplug the WLAN from router, so has connection to WI-FI , but no connection to internet.
Case2:
Insert a SIM card, turn on the Allow data at setting via 3G, but the card has no 3G dataplan.
All of Reachability will say there is internet connection and all api calls are fake...
This question already has answers here:
Closed 12 years ago.
Possible Duplicate:
Easiest way to determine whether iPhone internet connection is available?
Hi guys,
I'm developing an iPhone app. It works totally with internet.
When I run my app, how can I check if internet is active and it works correctly?
And if it's not I would to show a popup.
Thanks.
Be aware that Reachability is (in my opinion) a misnomer.
Reachability, including reachabilityWithHostName (as in Apple's example) only indicates whether the device has an available internet connection with which to reach the outside world.
IMPORTANTLY: it does not indicate whether the specified host is actually up and running.
To find out whether the remote host is actually up and running, you'll need to initiate a connection to the remote host and handle a timeout in the case that it is not.
There's no such thing as "Internet". There exists large number of computers and other hardware, linked together. Now, if you need a particular host, you can ping it (also in code, don't know if iPhone lets you do this, though). If you need to ensure that particular service on the particular host is up and running, your only option is to send a request and check the response.
Another vote for Apple's reachability example code here.
Note it's important to get this right - apparently it's grounds for app rejection if you provide a misleading error message relating to networking. For example if you say you could not reach myhost.com when in fact it's because there is no network connection.
I need to make a network connection over WWAN (i.e. the mobile network) on an iPhone, even when the device is connected to a Wi-Fi network, however I can't find a way to do this.
I've tried going down to the socket level and iterating through the available interfaces, however when connected to Wi-Fi, the WWAN interface (pdp_ip0) disappears.
The solution needs to be App Store safe.
Enumerate the network interfaces, you will see that when you're connected on both wifi and 3g, there are 2 with different local ip addresses. You might be able to use one vs the other by forcing a bind of your socket on the right interface before sending the data. The kernel which tries to find the best interface to route your packet should be happy with your choice.
Disclaimer: I have not tried this, this is just a suggestion.
Perhaps you can use the Reachability code to determine if Wi-Fi is enabled, firing a UIAlertView to warn the users to quit the app, open the Settings app and switch off wireless manually. Not ideal, definitely.
There is no supported way to to do this. You need to tell the user to turn off the WiFi connection since "It's a non-negotiable operational requirement for the service the app needs to connect to."
In this scenario, the user is not likely to kill you with bad reviews if you are clear about why they have to disable WiFi.
-t
I am trying to cover my bases with reachability so that my app doesn't get rejected by the App Store. I am familiar with the Reachability class that Apple provides in sample code. My question is, how best to implement this. I've seen that checking if the WWAN is accessible is not always best because it may be turned off for power consumption. So do I have to somehow enable it before checking for a connection. Just looking for steps to take. My app doesn't need a constant connection. It does some polling on a given interval that will require a connection and makes other various requests. Just trying to figure this out so I don't get rejected. Any help would be great.
Edit: Will reporting errors NSURLDomainError errors suffice for reporting reachability? It currently displays No Internet Connection and Can't Find Host. Seems that this is the type of information that the reachability example is used for.
Assuming that your application needs a connection to the internet, you could check the connectivity to a website that is always up (like e.g. google.com). The reachability sample code already contains a method to do just that.
I have not worked with the Reachability API enough to know how it reacts to the system switching off the WWAN for power saving. The only thing that comes to my mind is that you could try to establish a connection to the network so the system switches the WWAN on. Then you can run your reachability code to check what kind of connection you are working with. As said, I have not tried it, just an idea.