ASP implements interfaces that enable your component to access the properties and methods of the ASP built-in objects. You should use the IObjectContext interface to access the built-in object interfaces. Your component can then use the built-in object interfaces to access the properties, methods, and collections of the built-in objects. For more information, see IObjectContext in the COM section.
The following table lists the built-in object interfaces.
| Interface | Description |
| IApplicationObject | Calls the methods and properties of the Application object. |
| IASPError | Provides access to the read-only properties describing the last error event. |
| IReadCookie | Retrieves the values stored in the read-only Cookies collection. |
| IRequest | Calls the methods and properties of the Request object. |
| IRequestDictionary | Indexes the subcollections of the IRequest interface. You can also use it to retrieve the individual values stored in the ClientCertificate collection. |
| IResponse | Calls the methods and properties of the Response object. |
| IScriptingContext (Obsolete) | Returns a pointer to an interface on one of the built-in objects: IApplicationObject, IRequest, IResponse, IServer, or ISessionObject. |
| IServer | Calls the methods and properties of the Server object. |
| ISessionObject | Calls the methods and properties of the Session object. |
| IStringList | Retrieves the values stored in a string list, such as that in the QueryString, Form, or ServerVariables collections. |
| IVariantDictionary | Retrieves the items stored in the Application and Session Contents and StaticObjects collections. |
| IWriteCookie | Sets the values and attributes of a cookie stored in the write-only Cookies collection. |
To use the IScriptingContext and object interfaces in a C++ component, you must include the header file Asptlb.h as shown in the following code:
#include "asptlb.h"
IIS installs the Asptlb.h file in the \iissamples\sdk\include directory.
If you want to create a component that uses the ActiveX® Template Library (ATL) 1.1, install ATL on your machine and select ATL COM Appwizard when creating a new project workspace in Microsoft® Visual C++®.
For more information about the built-in objects, see Built-in Object Reference.