Qt5.11 app plugins build error: Signal and slot arguments is not compatible

Question

我想开发一个基于插件的 Qt 应用程序。

作为应用程序的一部分，插件应该能够将工具栏或小部件添加到应用程序的主窗口。 我认为插件的工具栏应该在插件的实现中创建并传递给 MainWindow。

Refer this link:Qt object management with Qt Plugins我写我的代码。 我使用on_Action_triggered()(function no param) 作为插槽来接收工具栏动作triggered() 的信号，然后将动作addShapeAction 连接到on_Action_triggered()，使用：

connect(addShapeAction,SIGNAL(triggered(bool)),this,SLOT(on_Action_triggered()))

但是我在构建代码时遇到了一些错误。 enter image description here 如：

C:\Qt\Qt5.10.1\5.10.1\msvc2015\include\QtCore\qobject.h:320: error: C2338: Signal and slot arguments are not compatible.

如何解决这个问题？ 有没有更好的方法来构建插件工具栏？

这里是shapeplugininterface.h的代码

#ifndef SHAPEPLUGININTERFACE_H
#define SHAPEPLUGININTERFACE_H

#include <QObject>
#include <QString>
#include <QtWidgets/QMainWindow>
class ShapePluginInterface{
public:
    virtual ~ShapePluginInterface(){}
    virtual QString description() = 0;
    virtual void generateShape(QString shapeType) = 0;
    virtual void Initialize(QMainWindow* window);
};
#define SHAPEPLUGININTERFACE_IID "com.geolike.shapeplugininterface"
Q_DECLARE_INTERFACE(ShapePluginInterface, SHAPEPLUGININTERFACE_IID)

#endif // SHAPEPLUGININTERFACE_H

这里是basic_shape_plugin.h的代码：

#ifndef BASIC_SHAPE_PLUGIN_H
#define BASIC_SHAPE_PLUGIN_H

#include "basic_shape_plugin_global.h"
#include "shapeplugininterface.h"
#include <QtPlugin>
#include <QDebug>
#include <QtWidgets/QAction>
#include <QtWidgets/QToolBar>

class BASIC_SHAPE_PLUGINSHARED_EXPORT Basic_Shape_Plugin:
        public QObject,
        public ShapePluginInterface
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID "com.geolike.shapeplugininterface")
    Q_INTERFACES(ShapePluginInterface)

public:
    Basic_Shape_Plugin();
    ~Basic_Shape_Plugin();
    QString description();
    void generateShape(QString shapeType);
    void Initialize(QMainWindow* window);
public slots:
    void on_Action_triggered();
};
#endif // BASIC_SHAPE_PLUGIN_H

basic_shape_plugin.cpp 文件：

#include "basic_shape_plugin.h"

Basic_Shape_Plugin::Basic_Shape_Plugin(){}
Basic_Shape_Plugin::~Basic_Shape_Plugin(){}

QString Basic_Shape_Plugin::description()
{
    return "This is a plugin to generate shapes.";
}

void Basic_Shape_Plugin::generateShape(QString shapeType)
{
    qDebug() << shapeType;
}
void Basic_Shape_Plugin::on_Action_triggered(){
    this->generateShape("Action Triggered!");
}
void Basic_Shape_Plugin::Initialize(QMainWindow *window)
{
    QAction* addShapeAction = new QAction(window);
    connect(addShapeAction,SIGNAL(triggered(bool)),this,SLOT(on_Action_triggered()));
    QToolBar* toolBar = new QToolBar;
    toolBar->addAction("Shapes",addShapeAction);
    window->addToolBar(toolBar);
}

Answer 1

您尝试使用的 addAction 方法签名并没有按照您的想法执行。

有两种方法可以修复代码。理想情况下，您应该让 addAction 为您提供一个操作 - 这就是整个便利 API 的设计目的：

void Basic_Shape_Plugin::Initialize(QMainWindow *window)
{
    auto *toolBar = new QToolBar;
    auto *addShapeAction = toolBar->addAction("Shapes");
    connect(addShapeAction, &QAction::triggered, this, &Basic_Shape_Plugin::on_Action_triggered);
    window->addToolBar(toolBar);
}

或者，您可以自己创建带有所需文本的操作：

void Basic_Shape_Plugin::Initialize(QMainWindow *window)
{
    auto *addShapeAction = new QAction("Shapes", window);
    connect(addShapeAction, &QAction::triggered, this, &Basic_Shape_Plugin::on_Action_triggered);
    auto *toolBar = new QToolBar;
    toolBar->addAction(addShapeAction);
    window->addToolBar(toolBar);
}

动作的父级并不重要 - 无论您将其创建为window 的子级，还是将QToolBar::addAction 创建为toolBar 的父级。