[in] Specifies the name of the window. The default value is NULL.

*dwStyle*

*dwExStyle*

*MenuOrID*

[in] For a child window, the window identifier. For a top-level window, a menu handle for the window. The default value is **0U**.

*lpCreateParam*

If successful, the handle to the newly created window; otherwise, NULL.

Nonzero if the initialization of the control hosting code was successful; otherwise FALSE.

This function uninitializes ATL's control hosting code by unregistering the **"AtlAxWin80"** and **"AtlAxWinLic80"** window classes.

[in] Specifies the name of the window. The default value is NULL.

*dwStyle*

*dwExStyle*

*MenuOrID*

[in] A variable of type [_U_MENUorID](../../atl/reference/u-menuorid-class.md) specifying a handle to a menu or a window identifier. The default value is 0U.

`CWindow::rcDefault` is defined as `__declspec(selectany) RECT CWindow::rcDefault = {CW_USEDEFAULT, CW_USEDEFAULT, 0, 0};`.

**Note** If 0 is used as the value for the *MenuOrID* parameter, it must be specified as 0U (the default value) to avoid a compiler error.

Initializes the [m_hWnd](#m_hwnd) member to *hWnd*, which by default is NULL.

Updates the specified multiple-window-position structure for the specified window.

```

It does not destroy the `CWindow` object itself.

```

```

Sets the keyboard focus to a control in the dialog box.

[in] Specifies the window styles to be added during style modification.

*nFlags*

TRUE if the window styles are modified; otherwise, FALSE.

If *nFlags* is nonzero, `ModifyStyle` calls the Win32 function `SetWindowPos`, and redraws the window by combining *nFlags* with the following four flags:

[in] Specifies the extended styles to be added during style modification.

*nFlags*

TRUE if the extended window styles are modified; otherwise, FALSE.

If *nFlags* is nonzero, `ModifyStyleEx` calls the Win32 function `SetWindowPos`, and redraws the window by combining *nFlags* with the following four flags:

```

```

The second version of this method uses a [RECT](https://msdn.microsoft.com/library/windows/desktop/dd162897) structure to set the window's new position, width, and height.

```

Displays the system caret.

[in] Specifies the name of the window. The default value is NULL.

*dwStyle*

*dwExStyle*

*MenuOrID*

[in] For a child window, the window identifier. For a top-level window, a menu handle for the window. The default value is **0U**.

*lpCreateParam*

If successful, the handle to the newly created window. Otherwise, NULL.

|Type of window|Window procedure|

|--------------------|----------------------|

|A window based on a window class that modifies an existing class, specified through the [DECLARE_WND_SUPERCLASS](window-class-macros.md#declare_wnd_superclass) macro.|The existing window class's window procedure.|

|A subclassed window.|The subclassed window's original window procedure.|

This argument adapter class allows either IDs (UINTs) or menu handles (HMENUs) to be passed to a function without requiring an explicit cast on the part of the caller.

The class defines two constructor overloads: one accepts a UINT argument and the other accepts an HMENU argument. The UINT argument is just cast to an HMENU in the constructor and the result stored in the class's single data member, [m_hMenu](#_u_menuorid__m_hmenu). The argument to the HMENU constructor is stored directly without conversion.

Functions that are implemented in unmanaged DLLs can be called from managed code using Platform Invoke (P/Invoke) functionality. If the source code for the DLL is not available, P/Invoke is the only option for interoperating. However, unlike other .NET languages, Visual C++ provides an alternative to P/Invoke. For more information, see [Using C++ Interop (Implicit PInvoke)](../dotnet/using-cpp-interop-implicit-pinvoke.md).

For functions that use only intrinsic types as arguments and return values, no extra work is required. Other data types, such as function pointers, arrays, and structures, require additional attributes to ensure proper data marshaling.

You can change the window style of a list control ([CListCtrl](../mfc/reference/clistctrl-class.md)) at any time after you create it. By changing the window style, you change the kind of view the control uses. For example, to emulate the Explorer, you might supply menu items or toolbar buttons for switching the control between different views: icon view, list view, and so on.

Available styles are listed in [Create](../mfc/reference/clistctrl-class.md#create). The styles **LVS_ICON**, **LVS_SMALLICON**, **LVS_LIST**, and **LVS_REPORT** designate the four list control views.