QtSerialPort - I can't see what I send

[Sajjad Ali]

I have "Hercules Simulator" I send data from my Qt Creator, but don't see anything on Hercules.

What I am doing wrong? pls help

#include <QApplication>
#include <QQmlApplicationEngine>
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    const auto serialPortInfos = QSerialPortInfo::availablePorts();
    for (const QSerialPortInfo &portInfo : serialPortInfos) {
        qDebug() << "\n"
                 << "Port:" << portInfo.portName() << "\n"
                 << "Location:" << portInfo.systemLocation() << "\n"
                 << "Description:" << portInfo.description() << "\n"
                 << "Manufacturer:" << portInfo.manufacturer() << "\n"
                 << "Serial number:" << portInfo.serialNumber() << "\n"
                 << "Vendor Identifier:"
                 << (portInfo.hasVendorIdentifier()
                         ? QByteArray::number(portInfo.vendorIdentifier(), 16)
                         : QByteArray()) << "\n"
                 << "Product Identifier:"
                 << (portInfo.hasProductIdentifier()
                         ? QByteArray::number(portInfo.productIdentifier(), 16)
                         : QByteArray());
    }

    QSerialPort serial;
    serial.setPortName("COM1");
    serial.setBaudRate(QSerialPort::Baud9600);
    serial.setDataBits(QSerialPort::Data8);
    serial.setParity(QSerialPort::NoParity);
    serial.setStopBits(QSerialPort::OneStop);
    serial.setFlowControl(QSerialPort::NoFlowControl);
    serial.open(QIODevice::ReadWrite);
    serial.write("Hello, world");
    serial.close();


    QQmlApplicationEngine engine;
    const QUrl url(u"qrc:/SerialPort/main.qml"_qs);
    QObject::connect(
        &engine,
        &QQmlApplicationEngine::objectCreated,
        &app,
        [url](QObject *obj, const QUrl &objUrl) {
            if (!obj && url == objUrl)
                QCoreApplication::exit(-1);
        },
        Qt::QueuedConnection);
    engine.load(url);

    return app.exec();
}

hopefully posting in right category :)

[Sajjad Ali]

These are my ports

 Port: "COM2" 
 Location: "\\\\.\\COM2" 
 Description: "Virtual Serial Port 9 (Electronic Team)" 
 Manufacturer: "Electronic Team" 
 Serial number: "" 
 Vendor Identifier: "" 
 Product Identifier: ""

 Port: "COM3" 
 Location: "\\\\.\\COM3" 
 Description: "Virtual Serial Port 9 (Electronic Team)" 
 Manufacturer: "Electronic Team" 
 Serial number: "" 
 Vendor Identifier: "" 
 Product Identifier: ""

 Port: "COM1" 
 Location: "\\\\.\\COM1" 
 Description: "Communications Port" 
 Manufacturer: "(Standard port types)" 
 Serial number: "" 
 Vendor Identifier: "" 
 Product Identifier: ""
QIODevice::write (QSerialPort): device not open

At end it says device not open. But I wrote command and also opened it in Hercules

[JonB]

@Sajjad-Ali said in QtSerialPort - I can't see what I send:

serial.open(QIODevice::ReadWrite);

open() returns a result for a reason, can you please check the result in your code! Assuming it fails, can you show QSerialPort::SerialPortError value. This is quite basic coding architecture.

[kuzulis]

@Sajjad-Ali said in QtSerialPort - I can't see what I send:

serial.write("Hello, world");
serial.close();

here