REQUIRED_CATEGORY( catID )
Parameters
catID
The ID of the required category. A globally unique identifier (GUID). The list below shows a sample of the stock categories.
| Ability | Category | CatID (GUID) |
| Simple Frame Site Containment | CATID_SimpleFrameControl [in] | {157083E0-2368-11cf-87B9-00AA006C8166} |
| Simple Data Binding | CATID_PropertyNotifyControl [in] | {157083E1-2368-11cf-87B9-00AA006C8166} |
| Advanced Data Binding | CATID_VBDataBound [in] | {157083E2-2368-11cf-87B9-00AA006C8166} |
| Windowless Controls | CATID_WindowlessObject [in] | {1D06B600-3AE3-11cf-87B9-00AA006C8166} |
| Internet-Aware Objects | See Internet Aware Objects in the Platform SDK for a sample list. | |
Remarks
A category that the COM object requires of its container.
When a user installs a COM object, it registers itself as a control in the system registry using its component category ID. This ID identifies the control's abilities and requirements. For example, the COM object may require that a container support data binding. If the container does not support the required feature, the container can refuse to host the COM object.
For more information about component categories, including a sample list, see What are Component Categories and how do they work? in the Platform SDK.
Example
See SERVICE_ENTRY
ATL Macros and Global Functions
See Also