Qt5.11应用插件生成错误:信号和插槽参数不兼容

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，插件应该能够向应用程序的MainWindow添加工具栏或小部件。我认为插件工具栏应该在插件的实现中创建并传递给MainWindow。

参考以下链接: Qt对象管理与Qt插件，我写我的代码。我使用一个on_Action_triggered()(函数no param)作为插槽来接收工具栏操作triggered()的信号，然后将操作addShapeAction连接到on_Action_triggered()，使用：

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

但我在构建代码时遇到了一些错误。在这里输入图像描述，例如：

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？有什么更好的方法来构建插件工具栏吗？

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方法签名并不能完成您认为它所做的事情。

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--这就是整个方便API设计的目的所在：

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，您可以自己使用所需的文本创建操作：

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);
}

该操作的父级并不重要--不管您是将其创建为window的子级，还是QToolBar::addAction将其创建为toolBar的父级。