pass argv[] from main to other class - constructor

Question

Hi I have a question about passing argv[] value to the other class. In my code, I want to pass the argv[1] parameter from cmd to the class mainWindow to trigger spacific event. Here is the code. #include "MainWindow.h"
int main(int argc, char *argv[])
{
#if _DEBUG
// Do not print memory leaks at end of program (QtWebKit causes a large number of them, see Menu class)
_CrtSetDbgFlag(_crtDbgFlag &~ _CRTDBG_LEAK_CHECK_DF);
#endif
QApplication app(argc, argv);
app.setApplicationName("Example_Qt");
MainWindow window;
window.show();
return app.exec();
}
MainWindow.cpp
MainWindow::MainWindow() :
m_pCurrentTutorial(0),
m_pCurrentTutorialAREL(0)
{
setupUi(this);
quitTutorialButton->setVisible(false);
QObject::connect(quitTutorialButton, SIGNAL(clicked()), this, SLOT(onQuitTutorialButtonClicked()));
m_pMenu = new Menu(this, this);
// Init the main view for the scene using OpenGL
QGLWidget *glWidget = new QGLWidget(QGLFormat(QGL::SampleBuffers));
m_pGraphicsView = graphicsView;
m_pGraphicsView->setScene(m_pMenu);
m_pGraphicsView->setViewport(glWidget);
m_pGraphicsView->setFrameShape(QFrame::NoFrame);
// Do not show context menu in web view
m_pGraphicsView->setContextMenuPolicy(Qt::NoContextMenu);
}
MainWindow::~MainWindow()
{
delete m_pMenu;
m_pMenu = 0;
delete m_pGraphicsView;
m_pGraphicsView = 0;
}
Mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <vector>
#include <QVBoxLayout>
#include <QWidget>
#include <QWebView>
class TutorialBase;
class TutorialBaseAREL;
#include "Menu.h"
#include "ui_MainWindow.h"
QT_BEGIN_NAMESPACE
class QGraphicsView;
class QBoxLayout;
QT_END_NAMESPACE
class MainWindow : public QMainWindow, public Ui::MainWindow, public Menu::TutorialSelectionCallback
{
Q_OBJECT
public:
MainWindow();
virtual ~MainWindow();
QBoxLayout* getButtonBar();
protected slots:
void onQuitTutorialButtonClicked();
protected:
void keyPressEvent(QKeyEvent *event);
void quitTutorialIfAny();
void startTutorial(int tutorialNumber);
void startTutorialAREL(int tutorialNumber);
TutorialBase* m_pCurrentTutorial;
TutorialBaseAREL* m_pCurrentTutorialAREL;
QGraphicsView* m_pGraphicsView;
Menu* m_pMenu;
};
#endif
Could anyone help me to pass the parameter from the argv[] to mainwindow.cpp ?
Many thanks
Ying

Answer 1

You should be able to just provide another constructor (or replace the current one) which takes a single char * argument, such as:
MainWindow::MainWindow (char *arg) :
m_pCurrentTutorial(0),
m_pCurrentTutorialAREL(0)
{
// body here, including checking argument, such as:
if (strcmp (arg, "-help") == 0) {
provideHelp();
}
}
and then use that constructor when creating your object:
MainWindow window (argv[1]);
Be aware that this new constructor will need to be listed in the class (in Mainwindow.h), not just added as a function to Mainwindow.cpp:
public:
MainWindow();
MainWindow(char*);
virtual ~MainWindow();