Problem connecting to the serial port

[SALA-BANAKISSA]

I have a problem opening the COM1 and communication to the xbee, I came writing even a single character even read what I get, is that a person of good will could help me if please? this is urgent, thank you.
here is my error message:
"
bool __thiscall QSerialPort::setBaudRate(int,class QFlags<enum QSerialPort::Direction>): device not open
Message written
"

[SGaist]

Hi,

The question might seem silly but: did you call open on your serial device before setting its baud rate ?

[SALA-BANAKISSA]

yes I opened the front port to speed configuration, see the function:

serial->open(QIODevice::ReadWrite);

serial->setBaudRate(9600);

if (serial->portName()!= "COM1") 

{

    serial->close();

    serial->setPortName("COM1");

    if (!serial->open(QIODevice::ReadWrite)) 

{

        processError(tr("Can't open %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));

        return;

    }

    if (!serial->setBaudRate(QSerialPort::Baud19200)) 

{
processError(tr("Can't set rate 19200 baud to port %1, error code %2")
.arg(serial->portName()).arg(serial->error()));

        return;


    }

    if (!serial->setDataBits(QSerialPort::Data8)) 

{

        processError(tr("Can't set 8 data bits to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));
        return;

    }

    if (!serial->setParity(QSerialPort::NoParity))

{

        processError(tr("Can't set no patity to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));
        return;

    }

    if (!serial->setStopBits(QSerialPort::OneStop))

{

        processError(tr("Can't set 1 stop bit to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));

        return;

    }

    if (!serial->setFlowControl(QSerialPort::NoFlowControl)) 

{

        processError(tr("Can't set no flow control to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));

        return;

    }
}


qDebug() << "Message written";

this->msgRequest = "O";

serial->write(msgRequest);

serialTimer->start(400);

[SALA-BANAKISSA]

and I still have the same error;

[SGaist]

Please, enclose your code in coding tags (one @ at the beginning and one at the end) That will make it readable.

You don't check that your first open did succeed

[SALA-BANAKISSA]

le code est :

@ serial->open(QIODevice::ReadWrite);
serial->setBaudRate(9600);

if (serial->portName()!= "COM1") {

    serial->close();
    serial->setPortName("COM1");

    if (!serial->open(QIODevice::ReadWrite)) {
        processError(tr("Can't open %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));
        return;
    }

    if (!serial->setBaudRate(QSerialPort::Baud19200)) {
        processError(tr("Can't set rate 19200 baud to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));
        return;
    }

    if (!serial->setDataBits(QSerialPort::Data8)) {
        processError(tr("Can't set 8 data bits to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));
        return;
    }

    if (!serial->setParity(QSerialPort::NoParity)) {
        processError(tr("Can't set no patity to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));
        return;
    }

    if (!serial->setStopBits(QSerialPort::OneStop)) {
        processError(tr("Can't set 1 stop bit to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));
        return;
    }

    if (!serial->setFlowControl(QSerialPort::NoFlowControl)) {
        processError(tr("Can't set no flow control to port %1, error code %2")
                     .arg(serial->portName()).arg(serial->error()));
        return;
    }
}


qDebug() << "Message written";
this->msgRequest = "O";
serial->write(msgRequest);
serialTimer->start(400);@

[SALA-BANAKISSA]

you say that my first successful opening is to say ? and the fact that this feature is linked to a button QPusButton I said, I do not understand why I do not.

[SGaist]

@serial->open(QIODevice::ReadWrite);@

This one, you just don't check that it worked,

[SALA-BANAKISSA]

I still have the same problem

[SALA-BANAKISSA]

it still does not work, what should I do?

[SGaist]

Did you check whether you have an error ? If so which one ?

[SALA-BANAKISSA]

Yes there is a mistake, because it does not even written on the port, it says that the port is not open, I can not communicate to a PC during a test of communication that I 'I write, I do not understand, help me please!

[SGaist]

Like I said:

@serial->open(QIODevice::ReadWrite);@

You don't check whether this call to open fails or not. Add the necessary if and and in the else part, print the error you are getting from serial.