I want to detect the state of network. I found two ways to look for the internet connection in bb 10.2 but no one seems to be working:
1: It always return "QNetworkAccessManager::UnknownAccessibility"
QNetworkAccessManager* networkAccessManager = new QNetworkAccessManager(this);
networkAccessManager->networkAccessible();
2: It always return true
QNetworkConfigurationManager *manager = new QNetworkConfigurationManager();
bool res = QObject::connect(manager,
SIGNAL(onlineStateChanged(bool)),
this,
SLOT(onOnlineStateChanged(bool)));
Q_ASSERT(res);
Could anybody help me on this?
A solution is to use QNetworkConfigurationManager::isOnline().
QNetworkConfigurationManager *manager = new QNetworkConfigurationManager();
Q_ASSERT(manager->isOnline());
Related
I want to to show message in my application when haptic feedback is disabled in phone settings. How to detect that haptic feedback is disabled in device settings?
It's kludgy, but might this work?
- (BOOL)isHapticFeedbackDisabled {
BOOL result = NO;
UISelectionFeedbackGenerator *feedbackGenerator = [[UISelectionFeedbackGenerator alloc] init];
[feedbackGenerator prepare];
if ([feedbackGenerator.description containsString:#"prepared=0"]) result = YES;
feedbackGenerator = nil;
return result;
}
There is no way to check Haptic Feedback is enabled/disabled but there is private int _feedbackSupportLevel in UIKit for checking if device supports it:
func logFeedbackSupported() {
let supportLevel = UIDevice.current.value(forKey: "_feedbackSupportLevel")
print(supportLevel ?? "")
}
0: Not available,
1: First generation available (< iPhone 7),
2: Second generation available.
I advise you not to use Apples private APIs because:
The API could be changed in any version without you knowing about it.
Apple is parsing your app code to find out if you're using private API so be aware. Your app could be rejected.
I am using iOs default PrinterToPrint in Xamarin to print without showing dialog to choose printer but then also it's showing one dialog which says printing to [PRINTER NAME]. Is there anyway to hide the dialog as well. Like complete silent print functionality?
I am not its possible but I have seen some apps which do that and I am not sure whether they are using the same function or not.
Thanks in advance.
Update:
UIPrinterPickerController comes from UIKit and as such there is no way to push the "printing" process to the background and off the main UI thread.
In the current UIPrintInteractionController.PrintToPrinter implementation (currently up to iOS 10.3 B4) there is no exposed way to disable the print progress (Connecting, Preparing, etc...) alart/dialog (w/ Cancel button) or to modify its appearance.
This interface is high level wrapper using AirPrint and thus Internet Print Protocol (IPP) at a lower level to preform the actual printing, job queue monitoring on the printer, etc... IPP is not currently exposed as a publicly available framework within iOS...
Programs that allow background printing are not using UIPrintInteractionController to do the printing. Most do use UIPrinterPickerController to obtain a UIPrinter selection from the user, but then use the UIPrinter.Url.AbsoluteUrl to "talk" directly to the printer via HTTP/HTTPS Post/Get. Depending upon the printers used, TCP-based sockets are also an option vs. IPP and even USB/serial for direct connected printers.
Re: https://en.wikipedia.org/wiki/Internet_Printing_Protocol
Original:
Pick a Printer:
if (allowUserToSelectDifferentPrinter || printerUrl == null)
{
UIPrinter uiPrinter = printerUrl != null ? null as UIPrinter : UIPrinter.FromUrl(new NSUrl(printerUrl));
var uiPrinterPickerController = UIPrinterPickerController.FromPrinter(uiPrinter);
uiPrinterPickerController.Present(true, (printerPickerController, userDidSelect, error) =>
{
if (userDidSelect)
{
uiPrinter = uiPrinterPickerController?.SelectedPrinter;
printerUrl = uiPrinter.Url.AbsoluteUrl.ToString();
Console.WriteLine($"Save this UIPrinter's Url string for later use: {printerUrl}");
}
});
}
Print using UIPrintInteractionController with an existing UIPrinter:
if (printerUrl != null)
{
// re-create a UIPrinter from a saved NSUrl string
var uiPrinter = UIPrinter.FromUrl(new NSUrl(printerUrl));
var printer = UIPrintInteractionController.SharedPrintController;
printer.ShowsPageRange = false;
printer.ShowsNumberOfCopies = false;
printer.ShowsPaperSelectionForLoadedPapers = false;
var printInfo = UIPrintInfo.PrintInfo;
printInfo.OutputType = UIPrintInfoOutputType.General;
printInfo.JobName = "StackOverflow Print Job";
var textFormatter = new UISimpleTextPrintFormatter("StackOverflow Rocks")
{
StartPage = 0,
ContentInsets = new UIEdgeInsets(72, 72, 72, 72),
MaximumContentWidth = 6 * 72,
};
printer.Delegate = new PrintInteractionControllerDelegate();
printer.PrintFormatter = textFormatter;
printer.PrintToPrinter(uiPrinter, (printInteractionController, completed, error) =>
{
if ((completed && error != null))
{
Console.WriteLine($"Print Error: {error.Code}:{error.Description}");
PresentViewController(
UIAlertController.Create("Print Error", "Code: {error.Code} Description: {error.Description}", UIAlertControllerStyle.ActionSheet),
true, () => { });
}
printInfo?.Dispose();
uiPrinter?.Dispose();
uiPrinter.
});
}
else
{
Console.WriteLine("User has not selected a printer...printing disabled");
}
I know this is a somewhat old thread but I had been struggling with implementing a silent printing in iOS for one of my customers and I finally came across an acceptable solution that is very easy to implement.
As mentioned in the accepted answer there is no way to get rid of the popup that displays printing progress. Yet there is a way of hiding it. You can simply change the UIWindowLevel of your key window to UIWindowLevel.Alert + 100. This will guarantee your current window will display above ANY alert view.
Be careful though, as I mentioned, it will be displayed over ANY alert view after the level has been changed. Luckily you can just switch this level back to "Normal" to get the original behavior.
So to recap my solution. I use UIPrintInteractionController.PrintToPrinter in order to print directly to a printer object I created using UIPrinter.FromUrl (this is Xamarin.iOS code btw). Before doing so, I adjust my window level to alert + 100 and once printing is complete I reset my window level to "Normal". Now my printing happens without any visual feedback to my user.
Hope this helps somebody!
I have an iOS app that makes some small network requests on app launch (resource updates, etc). If the user turns off cellular access for the app in iOS Settings, they get a prompt from iOS about network usage every time they launch. Is there a way to know programmatically that cellular data for this app has been disabled, so that I can disable the requests at startup?
So I found this on the apple dev forums from an Apple engineer (https://devforums.apple.com/message/1059332#1059332).
Another developer wrote in to DTS and thus I had a chance to
investigate this in depth. Alas, the news is much as I expected:
there is no supported way to detect that your app is in this state.
Nor is there a way to make a "no user interaction" network connection,
that is, request that the connection fail rather than present UI like
this. If these limitations are causing problems for your app, I
encourage you to file a bug describing your specific requirements.
https://developer.apple.com/bug-reporting/
So it looks like it is not possible to detect if cellular data for your app has been turned off.
Edit
I filed a radar for this requesting that it be added. I just got this notification in my radar
We believe this issue has been addressed in the latest iOS 9 beta.
I looked through the API diffs, but so far I can't find the new API.
As of iOS9, the capability to check the setting to enable/disable use of cellular data for your app (Settings/Cellular/AppName) is available using Apple's CTCellularData class. The following code will set cellularDataRestrictedState when it is run initially and then set it and log whenever it changes:
import CoreTelephony
var cellularDataRestrictedState = CTCellularDataRestrictedState.restrictedStateUnknown
let cellState = CTCellularData.init()
cellState.cellularDataRestrictionDidUpdateNotifier = { (dataRestrictedState) in
if cellularDataRestrictedState != .restrictedStateUnknown { // State has changed - log to console
print("cellularDataRestrictedState: " + "\(dataRestrictedState == .restrictedStateUnknown ? "unknown" : dataRestrictedState == .restricted ? "restricted" : "not restricted")")
}
cellularDataRestrictedState = dataRestrictedState
}
Unfortunately (as of iOS11) this seems to check only the state of the app's switch - if your app's switch is set to enabled and the user switches the Cellular Data master switch to disabled, this API will return the app's state as being "not restricted".
Just wanted to add an Objective C version of the above Swift code for future travellers.
- (void)monitorCanUseCellularData {
if (GCIsiOS9) {
CTCellularData *cellularData = [[CTCellularData alloc] init];
NSLog(#"%ld", cellularData.restrictedState);
// 0, kCTCellularDataRestrictedStateUnknown
[cellularData setCellularDataRestrictionDidUpdateNotifier:^(CTCellularDataRestrictedState state) {
NSLog(#"%ld", state);
self.canUseCellularData = cellularData.restrictedState ==2?true:false;
}];
}
}
I have found that the CTCellularData class needs some time to get to the correct value. In my implementation I call the didUpdateNotifier very early after appDidFinishLaunching. By the time my networking call are returning with errors I definitely have a correct value for the restricted state.
class CellularRestriction: NSObject {
private static var cellularData = CTCellularData()
private static var currentState = CTCellularDataRestrictedState.restrictedStateUnknown
static var isRestricted: Bool {
currentState = cellularData.restrictedState
return currentState == .restricted
}
static func prepare() {
if currentState == .restrictedStateUnknown {
cellularData.cellularDataRestrictionDidUpdateNotifier = { state in
currentState = cellularData.restrictedState // This value may be inconsistent, however the next read of isRestricted should be correct.
}
}
}
}
You can detect if cellular data disabled using NWPathMonitor class. (https://developer.apple.com/documentation/network/nwpathmonitor)
let cellMonitor = NWPathMonitor(requiredInterfaceType: .cellular)
cellMonitor.pathUpdateHandler = { path in
self.isCellConnected = path.status == .satisfied
}
Adding to dirkgroten's answer, you can use the Apple Reachability class, found here:
https://developer.apple.com/Library/ios/samplecode/Reachability/Introduction/Intro.html
It uses SCNetworkReachability, and is very straight forward to use, it will detect connectivity via Cell and WiFi as you will need to check both at start up.
There are lots of frameworks out there that will give you the status of your network connectivity, and of course you can roll your own. I've found AFNetworking to be one of the best. It has a singleton class called AFNetworkReachabilityManager that abstracts some of the complexities for you. Specifically you'll want to look at the two boolean properties:
reachableViaWWAN
reachableViaWiFi
There is also a reachability changed status block that you can set:
– setReachabilityStatusChangeBlock:
AFNetworking Github
AFNetworkReachabilityManager
I know this is a duplicate of many similar questions.But none of them were clear they where not giving proper solutions.My question is how to get WiFi signal strength in iOS devices?. I know it has done using Private API's but I don't know how to use?. Please can anyone help me please?
For ios9+
Register your app as Hotspot helper. (forums.developer.apple.com/message/30657#30657)
#import <NetworkExtension/NetworkExtension.h>
for(NEHotspotNetwork *hotspotNetwork in [NEHotspotHelper supportedNetworkInterfaces]) {
NSString *ssid = hotspotNetwork.SSID;
NSString *bssid = hotspotNetwork.BSSID;
BOOL secure = hotspotNetwork.secure;
BOOL autoJoined = hotspotNetwork.autoJoined;
double signalStrength = hotspotNetwork.signalStrength;
}
Reference:- https://stackoverflow.com/a/32971064/988169
Apple restrict (wireless private api) to use private api to find the strenth of wifi .
I have an iOS app that makes some small network requests on app launch (resource updates, etc). If the user turns off cellular access for the app in iOS Settings, they get a prompt from iOS about network usage every time they launch. Is there a way to know programmatically that cellular data for this app has been disabled, so that I can disable the requests at startup?
So I found this on the apple dev forums from an Apple engineer (https://devforums.apple.com/message/1059332#1059332).
Another developer wrote in to DTS and thus I had a chance to
investigate this in depth. Alas, the news is much as I expected:
there is no supported way to detect that your app is in this state.
Nor is there a way to make a "no user interaction" network connection,
that is, request that the connection fail rather than present UI like
this. If these limitations are causing problems for your app, I
encourage you to file a bug describing your specific requirements.
https://developer.apple.com/bug-reporting/
So it looks like it is not possible to detect if cellular data for your app has been turned off.
Edit
I filed a radar for this requesting that it be added. I just got this notification in my radar
We believe this issue has been addressed in the latest iOS 9 beta.
I looked through the API diffs, but so far I can't find the new API.
As of iOS9, the capability to check the setting to enable/disable use of cellular data for your app (Settings/Cellular/AppName) is available using Apple's CTCellularData class. The following code will set cellularDataRestrictedState when it is run initially and then set it and log whenever it changes:
import CoreTelephony
var cellularDataRestrictedState = CTCellularDataRestrictedState.restrictedStateUnknown
let cellState = CTCellularData.init()
cellState.cellularDataRestrictionDidUpdateNotifier = { (dataRestrictedState) in
if cellularDataRestrictedState != .restrictedStateUnknown { // State has changed - log to console
print("cellularDataRestrictedState: " + "\(dataRestrictedState == .restrictedStateUnknown ? "unknown" : dataRestrictedState == .restricted ? "restricted" : "not restricted")")
}
cellularDataRestrictedState = dataRestrictedState
}
Unfortunately (as of iOS11) this seems to check only the state of the app's switch - if your app's switch is set to enabled and the user switches the Cellular Data master switch to disabled, this API will return the app's state as being "not restricted".
Just wanted to add an Objective C version of the above Swift code for future travellers.
- (void)monitorCanUseCellularData {
if (GCIsiOS9) {
CTCellularData *cellularData = [[CTCellularData alloc] init];
NSLog(#"%ld", cellularData.restrictedState);
// 0, kCTCellularDataRestrictedStateUnknown
[cellularData setCellularDataRestrictionDidUpdateNotifier:^(CTCellularDataRestrictedState state) {
NSLog(#"%ld", state);
self.canUseCellularData = cellularData.restrictedState ==2?true:false;
}];
}
}
I have found that the CTCellularData class needs some time to get to the correct value. In my implementation I call the didUpdateNotifier very early after appDidFinishLaunching. By the time my networking call are returning with errors I definitely have a correct value for the restricted state.
class CellularRestriction: NSObject {
private static var cellularData = CTCellularData()
private static var currentState = CTCellularDataRestrictedState.restrictedStateUnknown
static var isRestricted: Bool {
currentState = cellularData.restrictedState
return currentState == .restricted
}
static func prepare() {
if currentState == .restrictedStateUnknown {
cellularData.cellularDataRestrictionDidUpdateNotifier = { state in
currentState = cellularData.restrictedState // This value may be inconsistent, however the next read of isRestricted should be correct.
}
}
}
}
You can detect if cellular data disabled using NWPathMonitor class. (https://developer.apple.com/documentation/network/nwpathmonitor)
let cellMonitor = NWPathMonitor(requiredInterfaceType: .cellular)
cellMonitor.pathUpdateHandler = { path in
self.isCellConnected = path.status == .satisfied
}
Adding to dirkgroten's answer, you can use the Apple Reachability class, found here:
https://developer.apple.com/Library/ios/samplecode/Reachability/Introduction/Intro.html
It uses SCNetworkReachability, and is very straight forward to use, it will detect connectivity via Cell and WiFi as you will need to check both at start up.
There are lots of frameworks out there that will give you the status of your network connectivity, and of course you can roll your own. I've found AFNetworking to be one of the best. It has a singleton class called AFNetworkReachabilityManager that abstracts some of the complexities for you. Specifically you'll want to look at the two boolean properties:
reachableViaWWAN
reachableViaWiFi
There is also a reachability changed status block that you can set:
– setReachabilityStatusChangeBlock:
AFNetworking Github
AFNetworkReachabilityManager