QNetworkConfigurationManager onlineState && iOS 10.3.2 problems (OBJECTIVE_SOURCES)

ekkescorner

there are known problems to always get the correct online state from iOS
my current workaround was this:
see https://bugreports.qt.io/browse/QTBUG-49751?focusedCommentId=354170&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-354170
see also https://bugreports.qt.io/browse/QTBUG-56151 and https://bugreports.qt.io/browse/QTBUG-58946

my workaround was working up to iOS 10.2.x
just updated

OSX from 10.11.6 to macOS 10.12.5
Xcode from 8.2 to 8.3.3
my iOS test devices from 10.2.1 to 10.3.2
all projects from Qt 5.8 to 5.9

then I recognized that my workaround didn't work as before and always reports iOS device as online - even while airplane mode is set
noticed that now there are 2 network adapters always active:

utun0 (as before)
en2 (new)

en2 normaly means an ethernet adapter. curious that iOS 10.3.2 reports en2 as active on my iPhone 6 ;-)

I changed my workaround and now if only utun0 and/or en2 are reported as active from QNCM I detect this as offline

there should be a better and more robust way
fortunately QTBUG-56151 contains a workaround you can download
https://bugreports.qt.io/secure/attachment/59615/NetworkConfTestWA.tar.gz

from this download I wanted to test the 2nd way using Reachability by adding some Objective sources.
But I cannot make this run

This is the very first time I'm trying to add OBJECTIVE_SOURCES and I never did any iOS native development.
probably I did something wrong.
Here are my steps to integrate this into my QTQuickControls2 APP:

I copied the objective sources into ios/src

changed .pro:

ios {
    OBJECTIVE_SOURCES += ios/src/Reachability.mm \
    ios/src/ReachabilityListener.mm

    QMAKE_INFO_PLIST = ios/Info.plist
    ios_icon.files = $$files($$PWD/ios/Icon*.png)
    QMAKE_BUNDLE_DATA += ios_icon
    ios_artwork.files = $$files($$PWD/ios/iTunesArtwork*.png)
    QMAKE_BUNDLE_DATA += ios_artwork
    app_launch_screen.files = $$files($$PWD/ios/MyLaunchScreen.xib)
    QMAKE_BUNDLE_DATA += app_launch_screen

    QMAKE_IOS_DEPLOYMENT_TARGET = 8.2

    include(ios_signature.pri)

    QMAKE_IOS_TARGETED_DEVICE_FAMILY = 1,2
}

added include:

#if defined (Q_OS_IOS)
#include "ios/src/ReachabilityListener.h"
#endif

changed class definition:

class DataServer : public QObject
#if defined (Q_OS_IOS)
    , private utility::ReachabilityDelegate
#endif

added statusChanged method

#if defined (Q_OS_IOS)
void DataServer::statusChanged(utility::NetworkStatus newStatus)
{
    if (newStatus == utility::NotReachable) {
        // offline
    } else {
        // online
    }
}
#endif

but getting error from build:

Undefined symbols for architecture arm64:
  "_SCNetworkReachabilityGetFlags", referenced from:
      -[Reachability connectionRequired] in Reachability.o
      -[Reachability currentReachabilityStatus] in Reachability.o
  "_SCNetworkReachabilityScheduleWithRunLoop", referenced from:
      -[Reachability startNotifier] in Reachability.o
  "_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from:
      -[Reachability stopNotifier] in Reachability.o
  "_SCNetworkReachabilitySetCallback", referenced from:
      -[Reachability startNotifier] in Reachability.o
  "_SCNetworkReachabilityCreateWithAddress", referenced from:
      +[Reachability reachabilityWithAddress:] in Reachability.o
  "_SCNetworkReachabilityCreateWithName", referenced from:
      +[Reachability reachabilityWithHostName:] in Reachability.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1

any idea what I did wrong ?

SGaist

Hi,

From a quick search, you may need to add LIBS += -framework SystemConfiguration to your .pro file.

Hope it helps

ekkescorner

@SGaist cool - now it compiles :)
Where do I find out which framework is needed ?

SGaist

Great !

Apple's developer site is working well for that.

ekkescorner

@SGaist
found https://developer.apple.com/library/content/samplecode/Reachability/Introduction/Intro.html
and then in the description the framework was mentioned

edit: this is helpful to understand iOS Reachability: https://symbiotics.co.za/checking-network-status-in-ios-apps/

thx again. without your help I never would have found this ;-)

SGaist

Great !

You're welcome !

Happy coding :)