Qt將信號連接到插槽

Question

我正在嘗試連接信號。 但是我一直遇到這個問題。 我確定我已經鏈接了包含QAction * actionCameraSetup的* .h文件。 我錯過了什么嗎？

請幫忙。 謝謝。

錯誤：

1> camera.cpp 1>。\\ camera.cpp（10）：錯誤C2065：'actionCamera_Setup'：未聲明的標識符

camera.cpp

#include "camera.h"
#include "camera_setup.h"
#include "ui_camera.h"

Camera::Camera(QWidget *parent, Qt::WFlags flags)
    : QMainWindow(parent, flags)
{
    ui.setupUi(this);

    connect(actionCamera_Setup, SIGNAL(activated()), this, SLOT(openCameraSetup()));
}

Camera::~Camera()
{

}

void Camera::openCameraSetup()
{
    newCameraSetup = new camera_setup();
    newCameraSetup->show();
}

相機

#ifndef CAMERA_H
#define CAMERA_H

#include <QtGui/QMainWindow>
#include "ui_camera.h"
#include "ui_camera_setup.h"

class camera_setup;

class Camera : public QMainWindow
{
    Q_OBJECT

public:
    Camera(QWidget *parent = 0, Qt::WFlags flags = 0);
    ~Camera();

public slots:
    void openCameraSetup();

private:
    Ui::CameraClass ui;
    camera_setup *newCameraSetup;
};

#endif // CAMERA_H

ui_camera.h

#ifndef UI_CAMERA_H
#define UI_CAMERA_H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QGridLayout>
#include <QtGui/QHeaderView>
#include <QtGui/QLabel>
#include <QtGui/QMainWindow>
#include <QtGui/QMenu>
#include <QtGui/QMenuBar>
#include <QtGui/QWidget>

class QAction;

QT_BEGIN_NAMESPACE

class Ui_CameraClass
{
public:
    QAction *actionExit;
    QAction *actionCamera_Setup;
    QAction *actionFull_Screen;
    QAction *action1_Camera_1;
    QAction *action1_Camera_2;
    QAction *action1_Camera_3;
    QAction *action1_Camera_4;
    QAction *action1_Camera_5;
    QAction *action1_Camera_6;
    QAction *action2_Camera_1;
    QAction *action2_Camera_2;
    QAction *action2_Camera_3;
    QAction *action2_Camera_4;
    QAction *action2_Camera_5;
    QAction *action2_Camera_6;
    QWidget *centralWidget;
    QGridLayout *gridLayout;
    QLabel *label_CCV;
    QMenuBar *menuBar;
    QMenu *menuFile;
    QMenu *menuView;
    QMenu *menuCameras;

    void setupUi(QMainWindow *CameraClass)
    {
        if (CameraClass->objectName().isEmpty())
            CameraClass->setObjectName(QString::fromUtf8("CameraClass"));
        CameraClass->resize(600, 367);
        actionExit = new QAction(CameraClass);
        actionExit->setObjectName(QString::fromUtf8("actionExit"));
        actionCamera_Setup = new QAction(CameraClass);
        actionCamera_Setup->setObjectName(QString::fromUtf8("actionCamera_Setup"));
        actionFull_Screen = new QAction(CameraClass);
        actionFull_Screen->setObjectName(QString::fromUtf8("actionFull_Screen"));
        action1_Camera_1 = new QAction(CameraClass);
        action1_Camera_1->setObjectName(QString::fromUtf8("action1_Camera_1"));
        action1_Camera_2 = new QAction(CameraClass);
        action1_Camera_2->setObjectName(QString::fromUtf8("action1_Camera_2"));
        action1_Camera_3 = new QAction(CameraClass);
        action1_Camera_3->setObjectName(QString::fromUtf8("action1_Camera_3"));
        action1_Camera_4 = new QAction(CameraClass);
        action1_Camera_4->setObjectName(QString::fromUtf8("action1_Camera_4"));
        action1_Camera_5 = new QAction(CameraClass);
        action1_Camera_5->setObjectName(QString::fromUtf8("action1_Camera_5"));
        action1_Camera_6 = new QAction(CameraClass);
        action1_Camera_6->setObjectName(QString::fromUtf8("action1_Camera_6"));
        action2_Camera_1 = new QAction(CameraClass);
        action2_Camera_1->setObjectName(QString::fromUtf8("action2_Camera_1"));
        action2_Camera_2 = new QAction(CameraClass);
        action2_Camera_2->setObjectName(QString::fromUtf8("action2_Camera_2"));
        action2_Camera_3 = new QAction(CameraClass);
        action2_Camera_3->setObjectName(QString::fromUtf8("action2_Camera_3"));
        action2_Camera_4 = new QAction(CameraClass);
        action2_Camera_4->setObjectName(QString::fromUtf8("action2_Camera_4"));
        action2_Camera_5 = new QAction(CameraClass);
        action2_Camera_5->setObjectName(QString::fromUtf8("action2_Camera_5"));
        action2_Camera_6 = new QAction(CameraClass);
        action2_Camera_6->setObjectName(QString::fromUtf8("action2_Camera_6"));
        centralWidget = new QWidget(CameraClass);
        centralWidget->setObjectName(QString::fromUtf8("centralWidget"));
        gridLayout = new QGridLayout(centralWidget);
        gridLayout->setSpacing(0);
        gridLayout->setContentsMargins(0, 0, 0, 0);
        gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
        label_CCV = new QLabel(centralWidget);
        label_CCV->setObjectName(QString::fromUtf8("label_CCV"));

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

        CameraClass->setCentralWidget(centralWidget);
        menuBar = new QMenuBar(CameraClass);
        menuBar->setObjectName(QString::fromUtf8("menuBar"));
        menuBar->setGeometry(QRect(0, 0, 600, 21));
        menuFile = new QMenu(menuBar);
        menuFile->setObjectName(QString::fromUtf8("menuFile"));
        menuView = new QMenu(menuBar);
        menuView->setObjectName(QString::fromUtf8("menuView"));
        menuCameras = new QMenu(menuView);
        menuCameras->setObjectName(QString::fromUtf8("menuCameras"));
        CameraClass->setMenuBar(menuBar);

        menuBar->addAction(menuFile->menuAction());
        menuBar->addAction(menuView->menuAction());
        menuFile->addAction(actionExit);
        menuView->addAction(menuCameras->menuAction());
        menuView->addAction(actionCamera_Setup);
        menuView->addSeparator();
        menuView->addAction(actionFull_Screen);
        menuCameras->addAction(action1_Camera_1);
        menuCameras->addAction(action1_Camera_2);
        menuCameras->addAction(action1_Camera_3);
        menuCameras->addAction(action1_Camera_4);
        menuCameras->addAction(action1_Camera_5);
        menuCameras->addAction(action1_Camera_6);
        menuCameras->addSeparator();
        menuCameras->addAction(action2_Camera_1);
        menuCameras->addAction(action2_Camera_2);
        menuCameras->addAction(action2_Camera_3);
        menuCameras->addAction(action2_Camera_4);
        menuCameras->addAction(action2_Camera_5);
        menuCameras->addAction(action2_Camera_6);

        retranslateUi(CameraClass);
        QObject::connect(actionCamera_Setup, SIGNAL(activated()), CameraClass, SLOT(show()));

        QMetaObject::connectSlotsByName(CameraClass);
    } // setupUi

    void retranslateUi(QMainWindow *CameraClass)
    {
        CameraClass->setWindowTitle(QApplication::translate("CameraClass", "Camera", 0, QApplication::UnicodeUTF8));
        actionExit->setText(QApplication::translate("CameraClass", "Exit", 0, QApplication::UnicodeUTF8));
        actionCamera_Setup->setText(QApplication::translate("CameraClass", "Camera Setup", 0, QApplication::UnicodeUTF8));
        actionFull_Screen->setText(QApplication::translate("CameraClass", "Full Screen", 0, QApplication::UnicodeUTF8));
        action1_Camera_1->setText(QApplication::translate("CameraClass", "1 Camera 1", 0, QApplication::UnicodeUTF8));
        action1_Camera_2->setText(QApplication::translate("CameraClass", "1 Camera 2", 0, QApplication::UnicodeUTF8));
        action1_Camera_3->setText(QApplication::translate("CameraClass", "1 Camera 3", 0, QApplication::UnicodeUTF8));
        action1_Camera_4->setText(QApplication::translate("CameraClass", "1 Camera 4", 0, QApplication::UnicodeUTF8));
        action1_Camera_5->setText(QApplication::translate("CameraClass", "1 Camera 5", 0, QApplication::UnicodeUTF8));
        action1_Camera_6->setText(QApplication::translate("CameraClass", "1 Camera 6", 0, QApplication::UnicodeUTF8));
        action2_Camera_1->setText(QApplication::translate("CameraClass", "2 Camera 1", 0, QApplication::UnicodeUTF8));
        action2_Camera_2->setText(QApplication::translate("CameraClass", "2 Camera 2", 0, QApplication::UnicodeUTF8));
        action2_Camera_3->setText(QApplication::translate("CameraClass", "2 Camera 3", 0, QApplication::UnicodeUTF8));
        action2_Camera_4->setText(QApplication::translate("CameraClass", "2 Camera 4", 0, QApplication::UnicodeUTF8));
        action2_Camera_5->setText(QApplication::translate("CameraClass", "2 Camera 5", 0, QApplication::UnicodeUTF8));
        action2_Camera_6->setText(QApplication::translate("CameraClass", "2 Camera 6", 0, QApplication::UnicodeUTF8));
        label_CCV->setText(QApplication::translate("CameraClass", "<html><head/><body><p><img src=\":/Camera/Resources/pictures/Camera View.jpg\"/></p></body></html>", 0, QApplication::UnicodeUTF8));
        menuFile->setTitle(QApplication::translate("CameraClass", "File", 0, QApplication::UnicodeUTF8));
        menuView->setTitle(QApplication::translate("CameraClass", "View", 0, QApplication::UnicodeUTF8));
        menuCameras->setTitle(QApplication::translate("CameraClass", "Cameras...", 0, QApplication::UnicodeUTF8));
    } // retranslateUi

};

namespace Ui {
    class CameraClass: public Ui_CameraClass {};
} // namespace Ui

QT_END_NAMESPACE

#endif // UI_CAMERA_H

Answer 1

actionCamera_Setup是類Ui::CameraClass的屬性。 在C ++中，只有屬性是屬於同一類代碼的屬性，才可以按名稱訪問屬性；否則，應該通過對象實例或指向對象實例的指針訪問屬性

instanceOfClassName.propertyName

要么

pointerToInstanceOfClassName->propertyName

在您的情況下， instanceOfClassName為ui因為在Camera類中定義了Ui::CameraClass ui屬性。