(QWebView) QWidget: Must construct a QApplication before a QPaintDevice

Question

Just trying to make a simple web viewer app so I can view a webpage in a widget and I am getting the error:

QWidget: Must construct a QApplication before a QPaintDevice

I feel like this is a problem with the webkit? I am statically linking this project.

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtGui>
#include <QWebPage>
#include <QtWebKit>
#include "Windows.h"

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

    QWebView *view = new QWebView(parent);
         view->load(QUrl("http://google.com/"));
         view->show();

}

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

main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    MainWindow w;
    w.show();

    return a.exec();
}

.pro file

QT       += core gui webkit network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = webkittest
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

header file

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QWebView>
#include <QUrl>
#include <QtPlugin>
#include <QGridLayout>
#include <QSystemTrayIcon>
#include <QMenu>
#include <QMessageBox>
#include <QDialog>
#include <QtWebKit>

class QAction;
 class QCheckBox;
 class QComboBox;
 class QGroupBox;
 class QLabel;
 class QLineEdit;
 class QMenu;
 class QPushButton;
 class QSpinBox;
 class QTextEdit;


namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

protected:
     //void closeEvent(QCloseEvent *event);
     //void keyPressEvent(QKeyEvent *);

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

signals:


private slots:
        //void onSslErrors(QNetworkReply* reply, const QList<QSslError> &errors);

private:
    Ui::MainWindow *ui;
    QWebView* m_pWebView;

#endif // MAINWINDOW_H

Any ideas what could be causing that?

Answer 1

通过安装最新版本的Qt框架并动态链接Webkit（已禁用静态链接）来解决此问题。