docs/mfc/relationship-between-a-cpp-window-object-and-an-hwnd.md · DOS汇编/cpp-docs

---
description: "Learn more about: Relationship Between a C++ Window Object and an HWND"
title: "Relationship Between a C++ Window Object and an HWND"
ms.date: "11/19/2018"
f1_keywords: ["HWND"]
helpviewer_keywords: ["Windows window [MFC]", "window objects [MFC], HWND and", "HWND [MFC]", "CWnd class [MFC], HWND", "HWND, window objects [MFC]"]
ms.assetid: f2e76340-6691-4ee6-9424-0345634a9469
---
# Relationship Between a C++ Window Object and an HWND

The window *object* is an object of the C++ `CWnd` class (or a derived class) that your program creates directly. It comes and goes in response to your program's constructor and destructor calls. The Windows *window*, on the other hand, is an opaque handle to an internal Windows data structure that corresponds to a window and consumes system resources when present. A Windows window is identified by a "window handle" (`HWND`) and is created after the `CWnd` object is created by a call to the `Create` member function of class `CWnd`. The window may be destroyed either by a program call or by a user's action. The window handle is stored in the window object's *m_hWnd* member variable. The following figure shows the relationship between the C++ window object and the Windows window. Creating windows is discussed in [Creating Windows](../mfc/creating-windows.md). Destroying windows is discussed in [Destroying Window Objects](../mfc/destroying-window-objects.md).

![CWnd window object and resulting window.](../mfc/media/vc37fj1.gif "CWnd window object and resulting window") <br/>
Window Object and Windows Window

## See also

[Window Objects](../mfc/window-objects.md)

DOS汇编/cpp-docs

About

Releases

Contributors

Language(Optional)

Activities