Qt連接信號插槽

我想連接一個信號。但我一直在遇到這個問題。我相信我已經鏈接了包含QAction * actionCameraSetup的* .h文件。我錯過了什麼嗎？Qt連接信號插槽

請幫忙。謝謝。

錯誤：

1>camera.cpp 1>.\camera.cpp(10) : error C2065: 'actionCamera_Setup' : undeclared identifier

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(); 
}

camera.h

#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

來源

2013-02-17 Wallace

嘗試使用ui.actionCamera_Setup代替actionCamera_Setup，因爲actionCamera_Setup不是在攝像機中定義的變量 – 2013-02-17 07:59:26

非常感謝！我在弄清楚我錯了什麼。 ui.actionCameraSetup的原因是因爲它位於ui命名空間中？ – Wallace 2013-02-17 08:04:53

不，ui是Ui_CameraClass的一個實例，它是Camera的私有成員。 – 2013-02-17 08:21:15

actionCamera_Setup是Ui::CameraClass類的財產。在C++中，你可以通過僅當它們是相同的類代碼的屬性屬於，否則，就應該通過對象實例或指針訪問屬性對象實例

instanceOfClassName.propertyName

或

pointerToInstanceOfClassName->propertyName

名稱訪問屬性在你的情況instanceOfClassName是ui，因爲在Camera類中有一個屬性Ui::CameraClass ui定義。

來源

2013-02-18 10:12:27 divanov

Qt連接信號插槽

回答

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