我正在尝试使用QAction（QMenu成员条目）打开一个新窗口 . 确切地说：我希望 actionAbout 信号预定义 activated 匹配 MainWindow 自定义插槽 open AboutWindow - 并且's what I'已经遇到了麻烦 .
我知道我可以在源main_window.cpp文件中手动使用 connect Qt函数，或者只是在Qt Creator中单击它，但我的自定义插槽没有't show up so I cannot select it. Maybe my slot function declaration is wrong (invalid parameters) and that'为什么QtCreator不允许我选择我的自定义插槽GUI signals & slots . 任何人都可以指出我应该怎样做才能让QtCreator在下拉列表中显示我的自定义插槽，连接函数调用应该如何？
这是我的main_window.h文件内容：
#include
#include "about_window.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public slots:
void openAboutWindow();
private:
Ui::MainWindow *ui;
Ui::AboutWindow *aboutWindow;
};
这是main_window.cpp：
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(actionAbout, SIGNAL(activated()), this, SLOT(openAboutWindow(this));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::openAboutWindow(QWidget *parent)
{
aboutWindow = new Ui::AboutWindow(parent); // Be sure to destroy you window somewhere
aboutWindow->show();
}
编译器对构造函数和openAbutWindow大喊：
../Application/main_window.cpp: In constructor ‘MainWindow::MainWindow(QWidget*)’:
../Application/main_window.cpp:9:13: error: ‘actionAbout’ was not declared in this scope
../Application/main_window.cpp:9:80: error: expected ‘)’ before ‘;’ token
../Application/main_window.cpp: In member function ‘void MainWindow::openAboutWindow(QWidget*)’:
../Application/main_window.cpp:19:44: error: invalid use of incomplete type ‘struct Ui::AboutWindow’
../Application/about_window.h:7:11: error: forward declaration of ‘struct Ui::AboutWindow’
../Application/main_window.cpp:20:15: error: invalid use of incomplete type ‘struct Ui::AboutWindow’
../Application/about_window.h:7:11: error: forward declaration of ‘struct Ui::AboutWindow’
1 回答
错误消息说明了一切，
QAction定义在哪里？应该是ui->actionAbout？openAboutWindow()不接受任何参数，无论this是不是类型的实例 .