qprocess가 완료되었는지 확인

Question

내 프로세스가 완료되었는지 확인해야하며,이를 원하지 않으므로 bool로 변환해야합니다. 내가 mainwindow.cpp에서 객체

QProcess *action; 

을 만든 MainWindow.h에서
는

void MainWindow:: shutdown() 
{ 
action=new QProcess(this); 
action->start("shutdown -s -t 600"); 
//and now I want to use if 
if (action has finished) 
{ 
    QMessageBox msgBox; 
    msgBox.setText("Your computer will shutdown in 1 minute."); 
    msgBox.exec(); 
} 

Answer 1

당신은 프로세스의 finished 신호에 연결해야합니다. 프로세스가 완료 될 때마다 코드가 호출됩니다. 예 :

// https://github.com/KubaO/stackoverflown/tree/master/questions/process-finished-msg-38232236 
#include <QtWidgets> 

class Window : public QWidget { 
    QVBoxLayout m_layout{this}; 
    QPushButton m_button{tr("Sleep")}; 
    QMessageBox m_box{QMessageBox::Information, 
      tr("Wakey-wakey"), 
      tr("A process is done sleeping."), 
      QMessageBox::Ok, this}; 
    QProcess m_process; 
public: 
    Window() { 
     m_layout.addWidget(&m_button); 
     m_process.setProgram("sleep"); 
     m_process.setArguments({"5"}); 
     connect(&m_button, &QPushButton::clicked, &m_process, [=]{ m_process.start(); }); 
     connect(&m_process, (void(QProcess::*)(int))&QProcess::finished, [=]{ m_box.show(); }); 
    } 
}; 

int main(int argc, char ** argv) { 
    QApplication app{argc, argv}; 
    Window window; 
    window.show(); 
    return app.exec(); 
}