通过 Internet 搜索,我遇到了很多使用 QWebView
和打开 URL 来做各种事情的方法,其中大部分是非功能性的、非特定的或部分功能性的。
经过多次咒骂和诅咒,我设法得到一个例子来做我想做的事,正常打开普通链接,并在外部浏览器中打开任何请求新窗口的东西;但是,有一个障碍。它会泄漏内存,因为我做了一堆额外的 WebViews
,直到进程退出才被清理。如何在不泄漏内存的情况下执行此操作?
请提前原谅我对Qt的浅薄理解。目前我只使用了几个小时。
中南合作:
测试.hpp
#include <QMainWindow>
#include <QWebView>
class Window : public QMainWindow {
Q_OBJECT
public:
Window();
private:
QWebView* m_web;
private slots:
};
class WebPage : public QWebPage {
Q_OBJECT
public:
bool acceptNavigationRequest(QWebFrame *frame, const QNetworkRequest &request, NavigationType type);
};
class WebView : public QWebView {
Q_OBJECT
public:
QWebView* createWindow(QWebPage::WebWindowType type);
};
测试.cpp
#include <QApplication>
#include <QGridLayout>
#include <QNetworkRequest>
#include <QDesktopServices>
#include "test.hpp"
Window::Window() :
QMainWindow() {
m_web = new WebView;
m_web->setHtml("<div align=\"center\"><a href=\"http://www.google.com/\">Same Window</a> <a href=\"http://www.google.com/\" target=\"_blank\">New Window</a></div>");
setCentralWidget(m_web);
}
bool WebPage::acceptNavigationRequest(QWebFrame*, QNetworkRequest const& request, NavigationType) {
QDesktopServices::openUrl(request.url());
return false;
}
QWebView* WebView::createWindow(QWebPage::WebWindowType) {
auto res = new WebView;
auto page = new WebPage;
res->setPage(page);
return res;
}
int main(int argc, char *argv[]) {
QApplication a(argc, argv);
Window w;
w.show();
return a.exec();
}
测试.pro
QT += core gui network webkitwidgets widgets
TEMPLATE = app
TARGET = test
INCLUDEPATH += .
CONFIG += c++11
# Input
SOURCES += test.cpp
HEADERS += test.hpp
编译运行
qmake test.pro
make
./test
最佳答案
在外部浏览器中呈现页面后, View 似乎变得无用。 您可能只是安排使用 deleteLater() 删除 ExternalWebView:
#include <iostream>
#include <QApplication>
#include <QGridLayout>
#include <QNetworkRequest>
#include <QDesktopServices>
#include <QEvent>
#include <QMainWindow>
#include <QWebView>
class ExternWebPage : public QWebPage {
//Q_OBJECT
public:
ExternWebPage(QObject* parent = 0)
: QWebPage(parent)
{
std::cout << "ExternWebPage" << std::endl;
}
~ExternWebPage() {
std::cout << "Destroy ExternWebPage" << std::endl;
}
virtual bool event(QEvent *e) {
static unsigned counter;
std::cout << ++counter << " ExternWebPage: " << e->type() << std::endl;
return QWebPage::event(e);
}
bool acceptNavigationRequest(QWebFrame *, const QNetworkRequest &request, NavigationType) {
QDesktopServices::openUrl(request.url());
return false;
}
};
class ExternWebView : public QWebView {
//Q_OBJECT
public:
ExternWebView(QWidget* parent = 0)
: QWebView(parent)
{
std::cout << "ExternWebView" << std::endl;
}
~ExternWebView() { std::cout << "Destroy ExternWebView" << std::endl; }
virtual bool event(QEvent *e) {
static unsigned counter;
std::cout << ++counter << " ExternWebView: " << e->type() << std::endl;
return QWebView::event(e);
}
};
class InternalWebView : public QWebView {
//Q_OBJECT
public:
InternalWebView(QWidget* parent = 0)
: QWebView(parent)
{}
QWebView* createWindow(QWebPage::WebWindowType) {
auto res = new ExternWebView();
res->setPage(new ExternWebPage(res));
res->deleteLater();
return res;
}
};
class Window : public QMainWindow {
//Q_OBJECT
public:
Window()
: QMainWindow()
{
std::cout << "Window" << std::endl;
auto web = new InternalWebView(this);
web->setHtml("<div align=\"center\"><a href=\"http://www.google.com/\">Same Window</a> <a href=\"http://www.google.com/\" target=\"_blank\">New Window</a></div>");
setCentralWidget(web);
}
~Window() { std::cout << "Destroy Window" << std::endl; }
};
int main(int argc, char *argv[]) {
QApplication a(argc, argv);
Window w;
w.show();
return a.exec();
}
不删除测试:
Window
ExternWebView
1 ExternWebView: 68
ExternWebPage
2 ExternWebView: 74
3 ExternWebView: 75
1 ExternWebPage: 43
2 ExternWebPage: 43
3 ExternWebPage: 43
4 ExternWebPage: 43
5 ExternWebPage: 43
Destroy Window
稍后删除测试:
ExternWebView
1 ExternWebView: 68
ExternWebPage
2 ExternWebView: 74
3 ExternWebView: 75
4 ExternWebView: 52
Destroy ExternWebView
Destroy ExternWebPage
Destroy Window
关于c++ - Qt:在默认浏览器中打开带有目标的链接,不会泄漏内存,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20308329/