In the above code snippet, we connect the "destroy" signal of our main window object to the gtk_main_quit function.

在上面的代码段中，我们将主窗口对象的“ destroy ”信号连接到gtk_main _ quit函数。

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MainWindow.xib: Object that defines your main window application.

xib：定义您的主窗口应用程序的对象。

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Points to the parent window object (of type CWnd) to which the dialog object belongs. If it is NULL, the dialog object's parent window is set to the main application window.

指向含有对话框地父窗口对象地指针。假如为NULL，对话框对象地父窗口设置为应用地主窗口。

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