I hope that you help me

yakine

hello
can any one help me please
this is my code iwant to create a button that when it clicked an html file open

@#include<QApplication>

include<QObject>

#include <QTwidjets>
#include<QDesktopServices>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QPushButton bouton;
QString link ="C:/Users/kouki/Desktop/versement.html";

QObject::connect(&bouton,SIGNAL(clicked()),&link,SLOT(QDesktopServices::openUrl(QUrl(link))));
bouton.show();

return app.exec();
}@
and this is the error
C:\Users\kouki\qtprojects\tesehtml\main.cpp:19: erreur : C2665: 'QObject::connect'ÿ: aucune des 3 surcharges n'a pu convertir tous les types d'arguments
c:\qt\qt5.2.1\5.2.1\msvc2012_64_opengl\include\qtcore\qobject.h(198): peut ˆtre 'QMetaObject::Connection QObject::connect(const QObject *,const char *,const QObject *,const char *,Qt::ConnectionType)'
c:\qt\qt5.2.1\5.2.1\msvc2012_64_opengl\include\qtcore\qobject.h(201): ou 'QMetaObject::Connection QObject::connect(const QObject *,const QMetaMethod &,const QObject *,const QMetaMethod &,Qt::ConnectionType)'
c:\qt\qt5.2.1\5.2.1\msvc2012_64_opengl\include\qtcore\qobject.h(205): ou 'QMetaObject::Connection QObject::connect(const QObject *,const char *,const char *,Qt::ConnectionType) const'
lors de la tentative de mise en correspondance de la liste des arguments '(QPushButton *, const char *, QString *, const char *)'
thank you in advance

Jeroentjehome

Hi,
My French is terrible, so no idea what your error codes tell me, besides your made a signal/slot error.
The Signal/slot connection you created is wrong.
The openUrl is a static member function, not a slot!
So in a class generate a slot, in that slot, call the static openUrl function.
The second mistake in your signal/slot is that both signal and slots need to have the same arguments!
Read this article please:
"Signals explained":https://qt-project.org/doc/qt-5.0/qtcore/signalsandslots.html

Eddy

Hi Yakine,

I advice you to read/understand the following :"getting started guide" http://qt-project.org/doc/qt-5/gettingstartedqt.html

I adapted it a little to your likings below.

Try the following approach :
make a new project using widgets and choose QMainwindow. (or QDialog, but then you get other names and stuff...)

adapt the ui file and add a QPushButton to it using Qt Creator. Keep the default name for it : pushButton.

then alter the following files :
mainwindow.h
@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

public slots:
void openHTML(); //ADD THIS LINE

private:
Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H
@
mainwindow.cpp
@
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <qdesktopservices.h>
#include <QUrl>
#include <QObject>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

  //ADD THIS LINE
connect(ui->pushButton, SIGNAL(clicked()), this,  SLOT(openHTML()));
//or
//connect(ui->pushButton, SIGNAL(clicked()),  this, SLOT(openHTML()));

}

MainWindow::~MainWindow()
{
delete ui;
}

  //ADD THIS SLOT

void MainWindow::openHTML()
{
QDesktopServices::openUrl(QUrl("file:///C:/QtProject.htm"));
}
@

Feel free to ask here if you have any doubts.

yakine

koukou

thank you both but Eddy i want that you knew that i have created an empty project am programing evry thing with qt creator i don't use the qt design i tryed what you suggest and it work's but it's not what i need if you can help please and sorry about my English

yakine

if you can tell me what slot i supposed to use ?

Jeroentjehome

@
void MainWindow::MainWindow(QWidget * parent):
QMainWindow(parent)
{
m_PushButton * = new QPushButton(this);
m_PushButton.setText("Start URL");
connect (m_PushButton, SIGNAL(clicked()),
this, SLOT(OpenURLRequest()));
}

// --> THIS IS YOUR SLOT!!!
void MainWindow::OpenURLRequest(void)
{
QDesktopServices::openUrl(QUrl("file:///C:/QtProject.htm"));
}
@
In your class definition:
@
public slots:
void OpenURLRequest(void);
@

Eddy

Hi Yakine,

I advice you to read the book :
"C++ GUI Programming with Qt 4"
If you google you might find the first version which is free.

chapter 2 explains in detail what you need (using only code and no ui file)

Basically you make a new class, put your button in it. Put it in a QLayout. Add a slot and connect to that slot. I already gave you 2 connect statements.

here is another example :
"Basic Layout Example":http://qt-project.org/doc/qt-4.8/layouts-basiclayouts.html

Hope this helps

yakine

am terrible i knew but sorry look i don't use poo i don't crate classes
all that i do it's crating an empty project with contain a main.cpp
in this main i creat my window
@QWidget window ;@

then i crate a qpushbutton like this

@QPushbutton button("open",&window);@

and when user clicked on this button an html file wich i created and i saved on my desktop open but how can i connect btween the button that i created and the html file

Eddy

Your "window" doesn't have a slot that calls openUrl.

That's why you have to make a derived class and define a custom slot yourself, as we showed you.

Please read the links we gave you, they will help you understand

yakine

thank you a lot Eddy am reading what you suggest and when i finished i will try to do it . thank you so much you are great person
i have a little request if you have any suggest or any tuto that can help me to realise a managment application for a medical office with qt Creator thank you again

Eddy

Thanks,

I can't help you with your new question. I suggest you start a new topic and be specific about what you want. Your question is too general.

yakine

ok thank's have a good day