从Qt中的信号调用成员函数的问题

Question

所以，我正在使用 Qt4 作为 GUI 框架，用 C++ 制作一个简单的计算器应用程序。我之前使用过 Qt，但这次我使用的是 C++ 而不是 python.

现在我的项目中有三个文件，

main.cpp （调用并运行主 GUI 的简单套件 class）
window.cpp （包含实现 GUI class 和其他例程的套件的文件。）
header.h （window.cpp 文件的模板。）

实现 class 的主要 GUI 称为 Ui_MainWindow。

现在，这个 class 有一个名为 handleButton

的成员函数

What I want to do is call this handlebutton function when a clicked event happens. So, what I should do is to connect the event to the slot (handlebutton) , right??

Button 的名称是 pushButton，如前所述，handlebutton 是一个成员函数的 class Ui_MainWindow

下面是应该实现后者的代码片段：

QObject::connect( pushButton , SIGNAL (clicked()), this , handleButton );

所以，当这个点击事件发生时 this->handleButton 应该被调用，对吧？？

但是我收到一个错误：

error: no matching function for call to ‘QObject::connect(QPushButton*&, const char [11], Ui_MainWindow*, void (&)())
QObject::connect( pushButton , SIGNAL (clicked()), this , handleButton );

我尝试将成员 func 设为静态并尝试了我能想到的所有方法，但它似乎对我不起作用。

请指导我如何解决这个问题。

文件：window.cpp

#include <iostream>
#include <window.h>

void Ui_MainWindow::handleButton ( void ) {
    std::cout << "Hi this is  MEeeeee!.\n";
    return;
}

void Ui_MainWindow::setupUi(QMainWindow *MainWindow) {
        if (MainWindow->objectName().isEmpty())
            MainWindow->setObjectName(QString::fromUtf8("MainWindow"));
        MainWindow->resize(423, 410);
        MainWindow->setMaximumSize(QSize(700, 600));
        centralwidget = new QWidget(MainWindow);
        centralwidget->setObjectName(QString::fromUtf8("centralwidget"));
        gridLayout_2 = new QGridLayout(centralwidget);
        gridLayout_2->setObjectName(QString::fromUtf8("gridLayout_2"));
        label_2 = new QLabel(centralwidget);
        label_2->setObjectName(QString::fromUtf8("label_2"));
        label_2->setMaximumSize(QSize(16777215, 41));
        QFont font;
        font.setPointSize(20);
        label_2->setFont(font);
        label_2->setAlignment(Qt::AlignCenter);

        gridLayout_2->addWidget(label_2, 0, 0, 1, 1);

        label = new QLabel(centralwidget);
        label->setObjectName(QString::fromUtf8("label"));
        QFont font1;
        font1.setFamily(QString::fromUtf8("Roboto"));
        font1.setPointSize(22);
        label->setFont(font1);
        label->setLayoutDirection(Qt::RightToLeft);
        label->setStyleSheet(QString::fromUtf8("background-color: rgb(179, 179, 179);\n""border-radius:4px;\n""padding:20px;"));
        label->setAlignment(Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter);

        gridLayout_2->addWidget(label, 1, 0, 1, 1);

        horizontalLayout = new QHBoxLayout();
        horizontalLayout->setObjectName(QString::fromUtf8("horizontalLayout"));
        gridLayout = new QGridLayout();
        gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
        pushButton = new QPushButton(centralwidget);
        pushButton->setObjectName(QString::fromUtf8("pushButton"));
        pushButton->setMinimumSize(QSize(0, 60));
        pushButton->setMaximumSize(QSize(60, 60));

        gridLayout->addWidget(pushButton, 0, 0, 1, 1);

        pushButton_2 = new QPushButton(centralwidget);
        pushButton_2->setObjectName(QString::fromUtf8("pushButton_2"));
        pushButton_2->setMinimumSize(QSize(0, 60));
        pushButton_2->setMaximumSize(QSize(60, 60));

        gridLayout->addWidget(pushButton_2, 0, 1, 1, 1);

        pushButton_3 = new QPushButton(centralwidget);
        pushButton_3->setObjectName(QString::fromUtf8("pushButton_3"));
        pushButton_3->setMinimumSize(QSize(0, 60));
        pushButton_3->setMaximumSize(QSize(60, 60));

        gridLayout->addWidget(pushButton_3, 0, 2, 1, 1);

        pushButton_4 = new QPushButton(centralwidget);
        pushButton_4->setObjectName(QString::fromUtf8("pushButton_4"));
        pushButton_4->setMinimumSize(QSize(0, 60));
        pushButton_4->setMaximumSize(QSize(60, 60));

        gridLayout->addWidget(pushButton_4, 1, 0, 1, 1);

        pushButton_5 = new QPushButton(centralwidget);
        pushButton_5->setObjectName(QString::fromUtf8("pushButton_5"));
        pushButton_5->setMinimumSize(QSize(0, 60));
        pushButton_5->setMaximumSize(QSize(60, 60));

        gridLayout->addWidget(pushButton_5, 1, 1, 1, 1);

        pushButton_6 = new QPushButton(centralwidget);
        pushButton_6->setObjectName(QString::fromUtf8("pushButton_6"));
        pushButton_6->setMinimumSize(QSize(0, 60));
        pushButton_6->setMaximumSize(QSize(60, 60));

        gridLayout->addWidget(pushButton_6, 1, 2, 1, 1);

        pushButton_7 = new QPushButton(centralwidget);
        pushButton_7->setObjectName(QString::fromUtf8("pushButton_7"));
        pushButton_7->setMinimumSize(QSize(0, 60));
        pushButton_7->setMaximumSize(QSize(60, 60));

        gridLayout->addWidget(pushButton_7, 2, 0, 1, 1);

        pushButton_8 = new QPushButton(centralwidget);
        pushButton_8->setObjectName(QString::fromUtf8("pushButton_8"));
        pushButton_8->setMinimumSize(QSize(0, 60));
        pushButton_8->setMaximumSize(QSize(60, 60));

        gridLayout->addWidget(pushButton_8, 2, 1, 1, 1);

        pushButton_9 = new QPushButton(centralwidget);
        pushButton_9->setObjectName(QString::fromUtf8("pushButton_9"));
        pushButton_9->setMinimumSize(QSize(0, 60));
        pushButton_9->setMaximumSize(QSize(60, 60));

        gridLayout->addWidget(pushButton_9, 2, 2, 1, 1);


        horizontalLayout->addLayout(gridLayout);

        verticalLayout = new QVBoxLayout();
        verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
        verticalLayout->setContentsMargins(0, -1, -1, -1);
        pushButton_15 = new QPushButton(centralwidget);
        pushButton_15->setObjectName(QString::fromUtf8("pushButton_15"));
        pushButton_15->setMinimumSize(QSize(0, 127));
        pushButton_15->setMaximumSize(QSize(60, 152));

        verticalLayout->addWidget(pushButton_15);

        pushButton_10 = new QPushButton(centralwidget);
        pushButton_10->setObjectName(QString::fromUtf8("pushButton_10"));
        pushButton_10->setMinimumSize(QSize(0, 60));
        pushButton_10->setMaximumSize(QSize(60, 60));

        verticalLayout->addWidget(pushButton_10);


        horizontalLayout->addLayout(verticalLayout);

        verticalLayout_3 = new QVBoxLayout();
        verticalLayout_3->setObjectName(QString::fromUtf8("verticalLayout_3"));
        pushButton_12 = new QPushButton(centralwidget);
        pushButton_12->setObjectName(QString::fromUtf8("pushButton_12"));
        pushButton_12->setMinimumSize(QSize(0, 60));
        pushButton_12->setMaximumSize(QSize(60, 60));

        verticalLayout_3->addWidget(pushButton_12);

        pushButton_11 = new QPushButton(centralwidget);
        pushButton_11->setObjectName(QString::fromUtf8("pushButton_11"));
        pushButton_11->setMinimumSize(QSize(0, 60));
        pushButton_11->setMaximumSize(QSize(60, 60));

        verticalLayout_3->addWidget(pushButton_11);

        pushButton_14 = new QPushButton(centralwidget);
        pushButton_14->setObjectName(QString::fromUtf8("pushButton_14"));
        pushButton_14->setMinimumSize(QSize(0, 60));
        pushButton_14->setMaximumSize(QSize(60, 60));

        verticalLayout_3->addWidget(pushButton_14);


        horizontalLayout->addLayout(verticalLayout_3);

        verticalLayout_2 = new QVBoxLayout();
        verticalLayout_2->setObjectName(QString::fromUtf8("verticalLayout_2"));
        pushButton_17 = new QPushButton(centralwidget);
        pushButton_17->setObjectName(QString::fromUtf8("pushButton_17"));
        pushButton_17->setMinimumSize(QSize(0, 127));
        pushButton_17->setMaximumSize(QSize(60, 152));

        verticalLayout_2->addWidget(pushButton_17);

        pushButton_13 = new QPushButton(centralwidget);
        pushButton_13->setObjectName(QString::fromUtf8("pushButton_13"));
        pushButton_13->setMinimumSize(QSize(0, 60));
        pushButton_13->setMaximumSize(QSize(60, 60));

        verticalLayout_2->addWidget(pushButton_13);


        horizontalLayout->addLayout(verticalLayout_2);


        gridLayout_2->addLayout(horizontalLayout, 2, 0, 1, 1);

        MainWindow->setCentralWidget(centralwidget);

        retranslateUi(MainWindow);

        QObject::connect( pushButton , SIGNAL (clicked()), this , handleButton );

        //this->handleButton(); 
      } // setupU

void Ui_MainWindow::retranslateUi(QMainWindow *MainWindow)
{
        MainWindow->setWindowTitle(QApplication::translate("MainWindow", "DD | Calc", 0, QApplication::UnicodeUTF8));
        label_2->setText(QApplication::translate("MainWindow", "DD - Calc", 0, QApplication::UnicodeUTF8));
        label->setText(QApplication::translate("MainWindow", "0", 0, QApplication::UnicodeUTF8));
        pushButton->setText(QApplication::translate("MainWindow", "1", 0, QApplication::UnicodeUTF8));
        pushButton_2->setText(QApplication::translate("MainWindow", "2", 0, QApplication::UnicodeUTF8));
        pushButton_3->setText(QApplication::translate("MainWindow", "3", 0, QApplication::UnicodeUTF8));
        pushButton_4->setText(QApplication::translate("MainWindow", "4", 0, QApplication::UnicodeUTF8));
        pushButton_5->setText(QApplication::translate("MainWindow", "5", 0, QApplication::UnicodeUTF8));
        pushButton_6->setText(QApplication::translate("MainWindow", "6", 0, QApplication::UnicodeUTF8));
        pushButton_7->setText(QApplication::translate("MainWindow", "7", 0, QApplication::UnicodeUTF8));
        pushButton_8->setText(QApplication::translate("MainWindow", "8", 0, QApplication::UnicodeUTF8));
        pushButton_9->setText(QApplication::translate("MainWindow", "9", 0, QApplication::UnicodeUTF8));
        pushButton_15->setText(QApplication::translate("MainWindow", "=", 0, QApplication::UnicodeUTF8));
        pushButton_10->setText(QApplication::translate("MainWindow", "0", 0, QApplication::UnicodeUTF8));
        pushButton_12->setText(QApplication::translate("MainWindow", "-", 0, QApplication::UnicodeUTF8));
        pushButton_11->setText(QApplication::translate("MainWindow", "+", 0, QApplication::UnicodeUTF8));
        pushButton_14->setText(QApplication::translate("MainWindow", "/", 0, QApplication::UnicodeUTF8));
        pushButton_17->setText(QApplication::translate("MainWindow", "C", 0, QApplication::UnicodeUTF8));
        pushButton_13->setText(QApplication::translate("MainWindow", "x", 0, QApplication::UnicodeUTF8));
    } // retranslateUi

文件：window.h

#ifndef WINDOW_H
#define WINDOW_H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QGridLayout>
#include <QtGui/QHBoxLayout>
#include <QtGui/QHeaderView>
#include <QtGui/QLabel>
#include <QtGui/QMainWindow>
#include <QtGui/QPushButton>
#include <QtGui/QVBoxLayout>
#include <QtGui/QWidget>
#include <iostream>

QT_BEGIN_NAMESPACE

class Ui_MainWindow
{

private slots:
    void handleButton();

public:

    QWidget *centralwidget;
    QGridLayout *gridLayout_2;
    QLabel *label_2;
    QLabel *label;
    QHBoxLayout *horizontalLayout;
    QGridLayout *gridLayout;
    QPushButton *pushButton;
    QPushButton *pushButton_2;
    QPushButton *pushButton_3;
    QPushButton *pushButton_4;
    QPushButton *pushButton_5;
    QPushButton *pushButton_6;
    QPushButton *pushButton_7;
    QPushButton *pushButton_8;
    QPushButton *pushButton_9;
    QVBoxLayout *verticalLayout;
    QPushButton *pushButton_15;
    QPushButton *pushButton_10;
    QVBoxLayout *verticalLayout_3;
    QPushButton *pushButton_12;
    QPushButton *pushButton_11;
    QPushButton *pushButton_14;
    QVBoxLayout *verticalLayout_2;
    QPushButton *pushButton_17;
    QPushButton *pushButton_13;

    void setupUi(QMainWindow *MainWindow);
    void retranslateUi(QMainWindow *MainWindow);
};




// namespace Ui {
//     class MainWindow: public Ui_MainWindow {};
// } // namespace Ui


QT_END_NAMESPACE

#endif // WINDOW_H

文件：main.cpp

#include <QApplication>
#include <QtCore/QVariant>
#include <iostream>
#include <window.h>

int main(int argc, char **argv)
{
 QApplication app (argc, argv);

 QMainWindow window;

 Ui_MainWindow win;

 win.setupUi(&window);

 window.show();

 return app.exec();
}

Answer 1

连接的正确语法是这样的：

QObject::connect( pushButton , SIGNAL (clicked()), this , SLOT(handleButton()));

或新的函数指针语法（在 Qt5 中）：

QObject::connect( pushButton , &QPushButton::clicked, this , Ui_MainWindow::handleButton);

但是你在那里做错了，你不应该修改 class UI_FormName，因为当你修改你的 .ui 文件时，该文件很可能会重新生成设计师，请查看文档 here，了解如何在代码中使用由 uic 生成的代码。

LE：谢谢@MathiasSchmid 我没有注意到缺少宏，需要在 class 的私有部分添加 Q_OBJECT 宏才能使信号和槽工作。

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