QextSerialPort hangs on close()

foes0175

I am using the QextSerialPort library in a small GUI application. I am able to open and communicate over the port successfully. However, I am not able to ever close the port manually by calling the close method. Here is my code. Anyone else seen this behavior before? Any suggestions? I am using Window 7 64bit.

@//get the available ports
SerialPort::FindAvailablePorts();

QList<QextPortInfo> portinfos = SerialPort::ports;
foreach(QextPortInfo q, portinfos)
{
Port_Name = q.portName;
ControllerCOM = new SerialPort();
ControllerCOM->myPort->setPortName(Port_Name);
ControllerCOM->myPort->open(QIODevice::ReadWrite);
if(ControllerCOM->myPort->isOpen())
{
ControllerCOM->myPort->setBaudRate(Port_Settings.BaudRate);
ControllerCOM->myPort->setDataBits(Port_Settings.DataBits);
ControllerCOM->myPort->setFlowControl(Port_Settings.FlowControl);
ControllerCOM->myPort->setParity(Port_Settings.Parity);
ControllerCOM->myPort->setStopBits(Port_Settings.StopBits);
ControllerCOM->myPort->setTimeout(Port_Settings.Timeout_Millisec);
ControllerCOM->myPort->setDtr(true);
ControllerCOM->myPort->setRts(true);

}

//connect the signals to the slots
connect(ControllerCOM,SIGNAL(dataAvailableSig(QByteArray,QString)),this,SLOT(Data_Received(QByteArray, QString)));
connect(ControllerCOM,SIGNAL(deviceConnectedSig()),this,SLOT(Controller_Connected()));
connect(ControllerCOM,SIGNAL(deviceLostSig()),this,SLOT(Controller_Disconnected()));
Run_Cmd("/1&R\r\n");
Sleep(50);

}@

In the destructor of the class I am calling the close method.
@Motor_Controller::~Motor_Controller()
{
if(ControllerCOM->myPort->isOpen())
ControllerCOM->myPort->close();
qDebug() << "Destroyed Controller";

}@

Jeroentjehome

Hi there,
Maybe just a thought (never used the QextSerialPort software) but it inherits its data stuff from QIODevice, so why not use those as signals for your slots like in the examples given:
@
QextSerialPort* port = new QextSerialPort("COM1");
connect(port, SIGNAL(readyRead()), myClass, SLOT(onDataAvailable()));
port->open();

void MyClass::onDataAvailable()
{
    QByteArray data = port->readAll();
    processNewData(usbdata);
}

@
Before the close you might want to disconnect the signal/slots first?
Good luck bug hunting!

koahnig

welcome to devnet

I did not notice such a behavior, when using QExtSerialPort. However, I know that there different versions are floating around. It may be dependent where you have downloaded yours. I had started out a while ago with a buggy version. SourceForge for instance holds an old version. The most recent version I know of is found "here":http://code.google.com/p/qextserialport/
There is also an alternative Qt-based implementations "QtSerialPort":http://qt-project.org/wiki/QtSerialPort

foes0175

Thanks guys. I found my problem. You do indeed need to make sure all signals are disconnected before trying to close the port. Happy coding!

mlong

Be sure and edit your initial post and add [Solved] to the title. Thanks!