The output from this example is as follows:

The output from this example is as follows:

The size of the structure, used for versioning.

The `hInstance` for this module (either exe or dll).

Default instance resource handle.

Operating system version information. Used internally by ATL.

Stores the version of ATL. Currently 0x0700.

ATL's internal GUID.

Used to synchronize access to the `m_rgResourceInstance` array. Used internally by ATL.

Array used to search for resources in all the resource instances of which ATL is aware. Used internally by ATL.

The size of the structure, used for versioning.

The handle instance to the type library for this module.

Address of the array element indicating the beginning of the object map entries for this module.

Address of the array element indicating the end of the object map entries for this module.

Critical section to serialize access to the object map entries. Used internally by ATL.

The size of the structure, in bytes.

Specifies how the target is to be represented. Representations can include content, an icon, a thumbnail, or a printed document. For a list of possible values, see [DVASPECT](/windows/desktop/api/wtypes/ne-wtypes-tagdvaspect) and [DVASPECT2](/windows/desktop/api/ocidl/ne-ocidl-tagdvaspect2).

Portion of the target that is of interest for the draw operation. Its interpretation varies depending on the value in the `dwDrawAspect` member.

Pointer to a [DVTARGETDEVICE](/windows/desktop/api/objidl/ns-objidl-tagdvtargetdevice) structure that enables drawing optimizations depending on the aspect specified. Note that newer objects and containers that support optimized drawing interfaces support this member as well. Older objects and containers that do not support optimized drawing interfaces always specify NULL for this member.

Information context for the target device pointed to by `ptd` from which the object can extract device metrics and test the device's capabilities. If `ptd` is NULL, the object should ignore the value in the `hicTargetDev` member.

The device context on which to draw. For a windowless object, the `hdcDraw` member is in the `MM_TEXT` mapping mode with its logical coordinates matching the client coordinates of the containing window. In addition, the device context should be in the same state as the one normally passed by a `WM_PAINT` message.

Pointer to a [RECTL](https://msdn.microsoft.com/library/windows/desktop/dd162907) structure specifying the rectangle on `hdcDraw` and in which the object should be drawn. This member controls the positioning and stretching of the object. This member should be NULL to draw a windowless in-place active object. In every other situation, NULL is not a legal value and should result in an `E_INVALIDARG` error code. If the container passes a non-NULL value to a windowless object, the object should render the requested aspect into the specified device context and rectangle. A container can request this from a windowless object to render a second, non-active view of the object or to print the object.

If `hdcDraw` is a metafile device context (see [GetDeviceCaps](/windows/desktop/api/wingdi/nf-wingdi-getdevicecaps) in the Windows SDK), this is a pointer to a `RECTL` structure specifying the bounding rectangle in the underlying metafile. The rectangle structure contains the window extent and window origin. These values are useful for drawing metafiles. The rectangle indicated by `prcBounds` is nested inside this `prcWBounds` rectangle; they are in the same coordinate space.

Nonzero if the drawing of the control is to be optimized, otherwise 0. If the drawing is optimized, the state of the device context is automatically restored when you are finished rendering.

Nonzero if the target has a zoom factor, otherwise 0. The zoom factor is stored in `ZoomNum`.

Nonzero if the dimensions of `prcBounds` are in HIMETRIC, otherwise 0.

The width and height of the rectangle into which the object is rendered. The zoom factor along the x-axis (the proportion of the object's natural size to its current extent) of the target is the value of `ZoomNum.cx` divided by the value of `ZoomDen.cx`. The zoom factor along the y-axis is achieved in a similar fashion.

The actual width and height of the target.

The calling convention. When using this structure with the [IDispEventSimpleImpl](../../atl/reference/idispeventsimpleimpl-class.md) class, this member must be CC_STDCALL. `CC_CDECL` is the only option supported in Windows CE for the `CALLCONV` field of the `_ATL_FUNC_INFO` structure. Any other value is unsupported thus its behavior undefined.

The variant type of the function return value.

The number of function parameters.

An array of variant types of the function parameters.

The size of the structure, used for versioning.

Reference count to determine how long the module should stay alive.

Tracks functions that have been registered to be called when ATL shuts down.

Used to coordinate access to internal data in multithreaded situations.

The size of the structure, used for versioning.

Used to serialize access to window registration code. Used internally by ATL.

Used to bind windows to their objects. Used internally by ATL.

Used to track window class registrations so that they can be properly unregistered at termination. Used internally by ATL.

The **this** pointer used to get access to the class instance in window procedures.

The thread ID of the current class instance.

Pointer to the next `_AtlCreateWndData` object.