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问从C++插件扩展现有的QML组件
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Ask Ubuntu用户

提问于 2013-10-07 15:16:52

回答 1查看 1.5K关注 0票数 1

首先，我想说我在Qt方面不是很有经验，但我想在现有的QML WebView组件中添加一个新特性，以设置一个标题值列表，包括用户代理头，在请求新的url时发送。执行它的方式，我认为是子类QWebView类(例如'MyWebView‘扩展QWebView)，并注册该类

qmlRegisterType<MyWebView>(uri, 1, 0, "MyWebView");

我已经创建了一个名为MyApp的“+ Tabbed”应用程序来注册MyWebView类，当使用预创建的后端类进行编码时。到目前为止，我所做的唯一一件事就是以这种方式创建第一个方法.h文件：

#ifndef MYWEBVIEW_H
#define MYWEBVIEW_H

#include <QtWebKitWidgets/QWebView>

class MyWebView : public QWebView
{
    Q_OBJECT
public:
    explicit MyWebView(QWebView *parent = 0);
};

#endif // MYWEBVIEW_H

用这个.cpp

#include "mywebview.h"

MyWebView::MyWebView(QWebView *parent) :
    QWebView(parent)
{
}

我没有任何设备连接到我的笔记本电脑，所以我只使用Ringtail桌面发行版进行开发。对于这个额外添加的文件，编译工作，但是当我试图运行或调试项目时(至少查看默认的MyApp.qml工作状态)，这些错误将显示如下：

启动/usr/lib/x86_64-linux-gnu/qt5 5/bin/qmlscene.file:///调试_路径/app/MyApp.qml:30类型不可用file:///调试_路径/app/ui/HelloTab.qml:3插件无法加载模块"MyApp"：无法加载库调试_路径/backend/modules/MyApp/libMyApp.so：(调试_路径/backend/modules/MyApp/libMyApp.so:未定义符号：_ZN8QWebView16staticMetaObjectE)

所以我想..。有些东西配置不好吗？你知道发生了什么事吗？

我使用的Ubuntu版本是否可能是64位？为什么我要执行

ldd -r libMyApp.so

有些行可能会说WebKit类是未定义的：

    linux-vdso.so.1 =>  (0x00007ffffb5d1000)
    libQt5Qml.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 (0x00007ff9e1baa000)
    libQt5Core.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 (0x00007ff9e1595000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007ff9e1291000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ff9e107b000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff9e0cb3000)
    libQt5Network.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Network.so.5 (0x00007ff9e097b000)
    libQt5V8.so.5 => /usr/lib/x86_64-linux-gnu/libQt5V8.so.5 (0x00007ff9e0337000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ff9e0032000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff9dfe14000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ff9dfbfd000)
    libicui18n.so.48 => /usr/lib/x86_64-linux-gnu/libicui18n.so.48 (0x00007ff9df837000)
    libicuuc.so.48 => /usr/lib/x86_64-linux-gnu/libicuuc.so.48 (0x00007ff9df4cb000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ff9df2c7000)
    libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007ff9defcb000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007ff9dedc2000)
    /lib64/ld-linux-x86-64.so.2 (0x00007ff9e2205000)
    libicudata.so.48 => /usr/lib/x86_64-linux-gnu/libicudata.so.48 (0x00007ff9dda52000)
    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007ff9dd812000)
undefined symbol: _ZN8QWebView16staticMetaObjectE   (./libMyApp.so)
undefined symbol: _ZN8QWebView5eventEP6QEvent   (./libMyApp.so)
undefined symbol: _ZNK7QWidget7devTypeEv    (./libMyApp.so)
undefined symbol: _ZN7QWidget10setVisibleEb (./libMyApp.so)
undefined symbol: _ZNK8QWebView8sizeHintEv  (./libMyApp.so)
undefined symbol: _ZNK7QWidget15minimumSizeHintEv   (./libMyApp.so)
undefined symbol: _ZNK7QWidget14heightForWidthEi    (./libMyApp.so)
undefined symbol: _ZNK7QWidget17hasHeightForWidthEv (./libMyApp.so)
undefined symbol: _ZNK7QWidget11paintEngineEv   (./libMyApp.so)
undefined symbol: _ZN8QWebView15mousePressEventEP11QMouseEvent  (./libMyApp.so)
undefined symbol: _ZN8QWebView17mouseReleaseEventEP11QMouseEvent    (./libMyApp.so)
undefined symbol: _ZN8QWebView21mouseDoubleClickEventEP11QMouseEvent    (./libMyApp.so)
undefined symbol: _ZN8QWebView14mouseMoveEventEP11QMouseEvent   (./libMyApp.so)
undefined symbol: _ZN8QWebView10wheelEventEP11QWheelEvent   (./libMyApp.so)
undefined symbol: _ZN8QWebView13keyPressEventEP9QKeyEvent   (./libMyApp.so)
undefined symbol: _ZN8QWebView15keyReleaseEventEP9QKeyEvent (./libMyApp.so)
undefined symbol: _ZN8QWebView12focusInEventEP11QFocusEvent (./libMyApp.so)
undefined symbol: _ZN8QWebView13focusOutEventEP11QFocusEvent    (./libMyApp.so)
undefined symbol: _ZN7QWidget10enterEventEP6QEvent  (./libMyApp.so)
undefined symbol: _ZN7QWidget10leaveEventEP6QEvent  (./libMyApp.so)
undefined symbol: _ZN8QWebView10paintEventEP11QPaintEvent   (./libMyApp.so)
undefined symbol: _ZN7QWidget9moveEventEP10QMoveEvent   (./libMyApp.so)
undefined symbol: _ZN8QWebView11resizeEventEP12QResizeEvent (./libMyApp.so)
undefined symbol: _ZN7QWidget10closeEventEP11QCloseEvent    (./libMyApp.so)
undefined symbol: _ZN8QWebView16contextMenuEventEP17QContextMenuEvent   (./libMyApp.so)
undefined symbol: _ZN7QWidget11tabletEventEP12QTabletEvent  (./libMyApp.so)
undefined symbol: _ZN7QWidget11actionEventEP12QActionEvent  (./libMyApp.so)
undefined symbol: _ZN8QWebView14dragEnterEventEP15QDragEnterEvent   (./libMyApp.so)
undefined symbol: _ZN8QWebView13dragMoveEventEP14QDragMoveEvent (./libMyApp.so)
undefined symbol: _ZN8QWebView14dragLeaveEventEP15QDragLeaveEvent   (./libMyApp.so)
undefined symbol: _ZN8QWebView9dropEventEP10QDropEvent  (./libMyApp.so)
undefined symbol: _ZN7QWidget9showEventEP10QShowEvent   (./libMyApp.so)
undefined symbol: _ZN7QWidget9hideEventEP10QHideEvent   (./libMyApp.so)
undefined symbol: _ZN7QWidget11nativeEventERK10QByteArrayPvPl   (./libMyApp.so)
undefined symbol: _ZN8QWebView11changeEventEP6QEvent    (./libMyApp.so)
undefined symbol: _ZNK7QWidget6metricEN12QPaintDevice17PaintDeviceMetricE   (./libMyApp.so)
undefined symbol: _ZNK7QWidget11initPainterEP8QPainter  (./libMyApp.so)
undefined symbol: _ZNK7QWidget10redirectedEP6QPoint (./libMyApp.so)
undefined symbol: _ZNK7QWidget13sharedPainterEv (./libMyApp.so)
undefined symbol: _ZN8QWebView16inputMethodEventEP17QInputMethodEvent   (./libMyApp.so)
undefined symbol: _ZNK8QWebView16inputMethodQueryEN2Qt16InputMethodQueryE   (./libMyApp.so)
undefined symbol: _ZN8QWebView18focusNextPrevChildEb    (./libMyApp.so)
undefined symbol: _ZN8QWebView12createWindowEN8QWebPage13WebWindowTypeE (./libMyApp.so)
undefined symbol: _ZThn16_NK7QWidget7devTypeEv  (./libMyApp.so)
undefined symbol: _ZThn16_NK7QWidget11paintEngineEv (./libMyApp.so)
undefined symbol: _ZThn16_NK7QWidget6metricEN12QPaintDevice17PaintDeviceMetricE (./libMyApp.so)
undefined symbol: _ZThn16_NK7QWidget11initPainterEP8QPainter    (./libMyApp.so)
undefined symbol: _ZThn16_NK7QWidget10redirectedEP6QPoint   (./libMyApp.so)
undefined symbol: _ZThn16_NK7QWidget13sharedPainterEv   (./libMyApp.so)
undefined symbol: _ZTI8QWebView (./libMyApp.so)
undefined symbol: _ZN8QWebPage16staticMetaObjectE   (./libMyApp.so)
undefined symbol: _ZN8QWebPage5eventEP6QEvent   (./libMyApp.so)
undefined symbol: _ZN8QWebPage13triggerActionENS_9WebActionEb   (./libMyApp.so)
undefined symbol: _ZN8QWebPage9extensionENS_9ExtensionEPKNS_15ExtensionOptionEPNS_15ExtensionReturnE    (./libMyApp.so)
undefined symbol: _ZNK8QWebPage17supportsExtensionENS_9ExtensionE   (./libMyApp.so)
undefined symbol: _ZN8QWebPage25shouldInterruptJavaScriptEv (./libMyApp.so)
undefined symbol: _ZN8QWebPage12createWindowENS_13WebWindowTypeE    (./libMyApp.so)
undefined symbol: _ZN8QWebPage12createPluginERK7QStringRK4QUrlRK11QStringListS8_    (./libMyApp.so)
undefined symbol: _ZN8QWebPage23acceptNavigationRequestEP9QWebFrameRK15QNetworkRequestNS_14NavigationTypeE  (./libMyApp.so)
undefined symbol: _ZN8QWebPage10chooseFileEP9QWebFrameRK7QString    (./libMyApp.so)
undefined symbol: _ZN8QWebPage15javaScriptAlertEP9QWebFrameRK7QString   (./libMyApp.so)
undefined symbol: _ZN8QWebPage17javaScriptConfirmEP9QWebFrameRK7QString (./libMyApp.so)
undefined symbol: _ZN8QWebPage16javaScriptPromptEP9QWebFrameRK7QStringS4_PS2_   (./libMyApp.so)
undefined symbol: _ZN8QWebPage24javaScriptConsoleMessageERK7QStringiS2_ (./libMyApp.so)
undefined symbol: _ZNK8QWebPage15userAgentForUrlERK4QUrl    (./libMyApp.so)
undefined symbol: _ZTI8QWebPage (./libMyApp.so)
undefined symbol: _ZN8QWebView11qt_metacastEPKc (./libMyApp.so)
undefined symbol: _ZN8QWebViewD2Ev  (./libMyApp.so)
undefined symbol: _ZN8QWebView11qt_metacallEN11QMetaObject4CallEiPPv    (./libMyApp.so)
undefined symbol: _ZN8QWebPage11qt_metacallEN11QMetaObject4CallEiPPv    (./libMyApp.so)
undefined symbol: _ZN8QWebViewC2EP7QWidget  (./libMyApp.so)
undefined symbol: _ZN8QWebPageD2Ev  (./libMyApp.so)
undefined symbol: _ZN8QWebPage11qt_metacastEPKc (./libMyApp.so)
undefined symbol: _ZN8QWebPageC2EP7QObject  (./libMyApp.so)

application-development

ubuntu-touch

qml

ubuntu-sdk

qt-creator

回答 1

Ask Ubuntu用户

发布于 2013-10-24 14:36:27

解决方案是将这一行添加到后端模块中的MyApp.pro文件中。

QT += webkit webkitwidgets

我以前试过，但直到现在才起作用。为什么？。因为我并没有建议在每次构建项目时都会生成后端模块libMyApp.so文件.

更改MyApp.pro后，有必要删除此文件：

build-MyApp-Desktop-Debug/backend/modules/MyApp/libMyApp.so

通过这种方式，文件将再次生成，但webkit依赖项将得到解决。

票数 1

页面原文内容由Ask Ubuntu提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://askubuntu.com/questions/354895

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