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我一直在研究向 LG 电视发送串行命令的项目。这是我的代码：

#include <QtSerialPort/QSerialPort>

#include <QTextStream>
#include <QCoreApplication>
#include <QFile>
#include <QStringList>

QT_USE_NAMESPACE

int main(int argc, char *argv[])
{
    QCoreApplication coreApplication(argc, argv);
    int argumentCount = QCoreApplication::arguments().size();
    QStringList argumentList = QCoreApplication::arguments();

    QTextStream standardOutput(stdout);

    /*if (argumentCount == 1) {
        standardOutput << QObject::tr("Usage: %1 <serialportname> [baudrate]").arg(argumentList.first()) << endl;
        return 1;
    }*/

    QSerialPort serialPort;
    QString serialPortName = "com3";
    serialPort.setPortName(serialPortName);


    serialPort.setBaudRate(QSerialPort::Baud9600);
    serialPort.open(QIODevice::WriteOnly);
    /*if (!serialPort.open(QIODevice::WriteOnly)) {
        standardOutput << QObject::tr("Failed to open port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
        return 1;
    }*/

    QFile dataFile("C:\\SerialCommand.dat");
    if (!dataFile.open(QIODevice::ReadOnly)) {
        standardOutput << QObject::tr("Failed to open file for reading") << endl;
        return 1;
    }

    QByteArray writeData(dataFile.readAll());
    dataFile.close();

    if (writeData.isEmpty()) {
        standardOutput << QObject::tr("Either no data was currently available on the standard input for reading, or an error occurred for port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
        return 1;
    }

    qint64 bytesWritten = serialPort.write(writeData);

    if (bytesWritten == -1) {
        standardOutput << QObject::tr("Failed to write the data to port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
        return 1;
    } else if (bytesWritten != writeData.size()) {
        standardOutput << QObject::tr("Failed to write all the data to port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
        return 1;
    } else if (!serialPort.waitForBytesWritten(5000)) {
        standardOutput << QObject::tr("Operation timed out or an error occurred for port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
        return 1;
    }

    standardOutput << QObject::tr("Data successfully sent to port %1").arg(serialPortName) << endl;

    return 0;
}

当我重新启动我的电脑时，我运行代码并且没有任何反应。之后，我打开 TeraTerm，发送文件，它就可以工作了（关闭电视 [不，它不切换]）。然后我断开 TeraTerm 中的端口并再次运行我的代码，但这一次它也能正常工作！

我尝试使用我的代码在一次运行中多次发送文件。我尝试打开串口后等待了很长时间。我尝试多次发送文件并在发送之间等待并重新打开文件。没有任何效果。

TeraTerm 是一个开源项目，但它对我（一个新手程序员）来说太先进了，无法导航。这是 TeraTerm 项目页面的链接。如果您发现我的代码与 TeraTerm 的代码之间存在任何重大差异，我将非常感谢您指出这一点。

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