Interrupt 3rd party endless function

nevdokimof

I have 3rd party function, say 3rdpartyClass::connect(std::string ip, int port), which is being stucked if you pass wrong IP. I want it to abort or return from function which calls connect (MyClass::init() below) after some time (3 second for example) in case it's still running.

I've tried messing with timers and QThread::terminate() but nothing has worked.

Is there a proper way to do what I want somehow?

A bit context:

myclass.h:

class MyClass : public QObject
{
    Q_OBJECT

    3rdpartyClass *3rdpartyObj = nullptr;

    SomeClass *someClassObj;
    SomeOtherClass *someOtherClassObj;

public:
    MyClass(QObject *parent = nullptr);

public slots:
   void init();
}

myclass.cpp:

MyClass::MyClass(QObject *parent) : QObject(parent)
{
    3rdpartyClass *3rdpartyObj = new 3rdpartyClass();
    someClassObj = new SomeClass();
    someOtherClassObj = new SomeOtherClass();
}

MyClass::init()
{
    3rdpartyObj->connect("192.168.1.1", 100); //<-------- possible endless loop here
}

myclassmanager.h:

class MyClassManager : public QObject
{
    Q_OBJECT

    QThread* workingThread = nullptr;

    MyClass *myClass = nullptr;

public:
    MyClassManager(QObject *parent = nullptr);
}

myclassmanager.cpp:

MyClassManager::MyClassManager(QObject *parent) : QObject(parent)
{
    myClass = new MyClass();
    workingThread = new QThread(this);
    workingThread->start();
    myClass->moveToThread(workingThread);

    QMetaObject::invokeMethod(myClass, &MyClass::init);
}

SGaist

Hi,

Doesn't that third party offer any kind of API for that ?

If so, a possible workaround would be to use QNetworkAccessManager to check whether the wanted host is reachable before starting the connection through your third party.

aha_1980

@nevdokimof

Just to add to @SGaist: I don't think there is a way to abort a function and continue your program (well,with a debugger it would be possible)

You could wrap the 3rdparty API into a separate program, which you start by QProcess. You could then abort the program after some timeout.

Regards

nevdokimof

@SGaist thank you so much! Checking host reachability before trying to connect is perfect solution for me.