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从 Qt 中的信号调用成员函数的问题



所以，我正在使用Qt4作为GUI框架在C++制作一个简单的计算器应用程序。 我以前使用过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 (调用和运行主 GUI 类的简单套件(
  • 窗口.cpp (实现 GUI 类和其他例程的文件包含套件。
  • header.h (window.cpp文件的模板。

主要的 GUI 实现类称为Ui_MainWindow。

现在，此类具有一个名为handleButton的成员函数

我想做的是在发生clicked事件时调用此handlebutton函数。 那么，我应该做的是将事件连接到插槽(handlebutton(，对吗？

按钮的名称是pushButton，如前所述，handlebutton是一个成员函数 类Ui_MainWindow

这是应该实现后面的代码片段：

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

那么，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，即：

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

我尝试使成员功能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。

请指导我如何解决此问题。

文件：窗口.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：窗口.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：主.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();
}

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什么，你不应该修改类UI_FormName，因为当你在 Designer 中修改.ui文件时，该文件很可能会重新生成，请查看此处的文档，了解如何在代码中使用uic生成的代码。

LE：谢谢你@MathiasSchmid 我没有注意到宏丢失了，Q_OBJECT宏需要在类的私有部分添加才能使信号和插槽工作。

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