如何在QProcess中使用cmd.exe命令

问题描述

我尝试在Windows命令提示符下运行命令类型，但进程未启动。如果我尝试通过命令提示符直接使用此命令，则它将起作用。这是代码：

void MainWindow::firmware()
{
    QProcess *proc = new QProcess(this);
    QString dir("C:/Qtstatic/Examples/My/build-RBoxReader-Desktop_Qt_5_15_0_MSVC2019_64bit-Debug");
    proc->setWorkingDirectory(dir);
    QMessageBox msgBox;
    QString msg = "Current dir: %1";
    msg = msg.arg(proc->workingDirectory());
    msgBox.setText(msg);
    msgBox.exec();
    QString command("type");
    QStringList arguments;
    arguments << "my_file.txt";
    proc->start(command,arguments);
    if(!proc->waitForStarted()) {
        QMessageBox msgBox1;
        QString msg1 = "Process state: %1";
        msg1 = msg1.arg(proc->state());
          msgBox1.setText(msg1);
          msgBox1.exec();
        QMessageBox msgBox;
        QString msg = "Process didn't start";
          msgBox.setText(msg);
          msgBox.exec();
          return;
    }
    msg = "Process state: %1";
    msg = msg.arg(proc->state());
      msgBox.setText(msg);
      msgBox.exec();
    proc->waitForFinished (-1);
}

解决方法

鉴于在您的代码中没有看到"cmd.exe"，我无法理解您的期望。您的系统上没有type.exe。您必须自己实际运行cmd.exe，并将type作为参数传递给它：

您会想要类似的东西：

QString command = QStringLiteral("cmd.exe");
QStringList arguments{QStringLiteral("/K"),QStringLiteral("type"),QStringLiteral("my_file.txt")};

qprocess qt qt5