QDebug print out "QObject::startTimer: Timers can only be used with threads started with QThread" when I run QModbusClient::sendReadRequest in std::thread

[HuXiaoer]

I use Qt5.9.8 and my code like this:

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
   std::thread([] {
			//QModbusRtuSerialMaster ->connectDevice
                       //run QModbusRtuSerialMaster ->sendReadRequest 
		}).detach();
    return app.exec();
}

[jsulm]

@HuXiaoer Why don't you use QThread instead of std::thread?

[HuXiaoer]

@jsulm Why The SendReadRequest binding slot function could not be called when I use QThread

[Dariusz]

@HuXiaoer I don't know if this help... but what about simply >

QThreadPool pool;
QtConcurrent::run(&pool,[&]() {doUrstuffHere});

?
Or maybe u need QMetaObject::invokeMethod(object,[&](){},Qt::QueuedConnection);
?

[jsulm]

@HuXiaoer said in QDebug print out "QObject::startTimer: Timers can only be used with threads started with QThread" when I run QModbusClient::sendReadRequest in std::thread:

Why The SendReadRequest binding slot function could not be called when I use QThread

I don't know what this means. Can you please explain better?
Also, why do you need threads at all? QtModbus has an asynchronous API...