温馨提示:本文翻译自stackoverflow.com,查看原文请点击:c++ - How to read when QProcess need user input with Qt
c++ QT qprocess

c++ - 当QProcess需要用户输入Qt时如何阅读

发布于 2020-04-10 10:59:29

我使用Qt来实现允许为嵌入式系统开发的接口。

我面临一个问题:为了将程序闪存到嵌入式系统中,我使用QProcess,以便使用命令“ make”和“ make flash”。为了没有任何问题,该程序可以成功编译。

但是,当我尝试对“ make flash”执行相同的操作时,会出现问题,因为控制台正在等待用户输入,他必须按下嵌入式系统上的按钮。

但是QProcess仅在脚本完成时才返回标准输出,因此我没有消息“按下按钮”。

所以我的问题是:我怎么知道QProcess需要用户输入的时间?还是如果不可能,如何使用Qt动态打开控制台并启动命令?

我想在这里说什么:https : //www.qtcentre.org/threads/47538-QProcess-read-from-stdout-lively

这是我的代码:

compilator->start("make flash");    
compilator->waitForFinished();
QByteArray errors = compilator->readAllStandardError();
QString stringError(errors);
QByteArray message = compilator->readAll();
QString stringMessage(message);
m_logForm->setText("Project path : "
                   + pathProject + "\n"
                   + "Flash finished with exit code " + QString::number(compilator->exitCode()) + "\n"
                   + stringError + "\n"
                   + stringMessage + "\n");

其中m_logFrom是用于在我的界面中显示控制台报告的类

[编辑]我尝试了弗拉基米尔所说的。不幸的是,我没有我的资料,所以我无法对其进行测试,但是为了测试,我已经完成了这个脚本(test.bat):

set /p answer=Do you want to create it now (Y/N)?

这是我的新代码:

QProcess *compilator = new QProcess(this);
    connect(compilator, &QProcess::readyReadStandardOutput, [compilator, this](){
        QString output =compilator->readAll();
        qDebug() << "output: "<< output;
        m_logForm->setText("Flash finished with exit code " + QString::number(compilator->exitCode()) + "\n"
                           + output + "\n");
    });

    connect(compilator, &QProcess::readyReadStandardError, [compilator, this](){
        QString err = compilator->readAllStandardError();
        qDebug() << "error: "<<err;
        m_logForm->setText("Flash finished with exit code " + QString::number(compilator->exitCode()) + "\n"
                           + err + "\n");
    });
    m_logForm->setText("Flashing to serial port "+m_Serial + "\n");
    compilator->setWorkingDirectory(pathProject);

    compilator->start("test.bat");


    }

却无能为力

查看更多

提问者
Nicolas Borowicz
被浏览
167
Vladimir Bershov 2020-02-04 04:03

我的test.bat

set /p answer=Do you want to create it now (Y/N)?
echo "user response:" %answer%
pause

该代码启动批处理命令,读取其输出,并将答案写入过程:

QProcess *compilator = new QProcess(this);

connect(compilator, &QProcess::readyReadStandardOutput, [compilator, this]() 
{
    QString output = compilator->readAllStandardOutput().simplified();
    qDebug().noquote() << "output: " << output;

    if (output.contains("(Y/N)?", Qt::CaseInsensitive))
    {
        compilator->write("Y\n"); // write our answer to the process
    }
    else if (output.contains(". . .", Qt::CaseInsensitive))
    {
        compilator->write("\n"); // simulate press any key to process
    }
});

connect(compilator, &QProcess::readyReadStandardError, [compilator, this]() 
{
    QString err = compilator->readAllStandardError().simplified();
    qWarning().noquote() << "error: " << err;
});

// Handle the finished() signal:
connect(compilator, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished),
    [compilator, this](int exitCode, QProcess::ExitStatus exitStatus) 
{ 
    qDebug() << "compilator process finished with exit code =" << exitCode
        << "and exit status =" << exitStatus;
});    

compilator->start("test.bat");

if (compilator->waitForStarted()) // use to check start errors
{
    qDebug() << "compilator process started ok";
}
else
{
    qCritical() << "compilator process start FAILED:" << compilator->errorString();
}