BEEPER Attributes Sample: Demonstrates a Tearoff Interface

The BEEPER attributes sample illustrates the implementation of a tearoff interface — a collection/enumeration of BSTR values. It can be built as a DLL and as an EXE.

The BEEPER sample is the nonattributed version of this sample.

The MINIMAL sample shows how to build a DLL that does not link in the C run-time libraries (how to use #define _ATL_MIN_CRT).

Security Note

This sample code is provided to illustrate a concept and should not be used in applications or Web sites, as it may not illustrate the safest coding practices.

Building and Running the Sample

To build and run this sample

  1. Open the solution file beeper.sln.

  2. From the Build menu, click Build Solution.

  3. After the sample builds, open beeper.htm (an HTML file that uses VBScript) in your Web browser and follow its instructions.

Attributes

This sample uses the following attributes:

aggregatable, coclass, dual, emitidl, helpstring, id, in, module, object, out, pointer_default, progid, propget, restricted, retval, support_error_info, threading, uuid, version

Keywords

This sample uses the following keywords:

BEGIN_COM_MAP; CComCoClass; CComModule::Unlock; CComObjectRoot; COM_INTERFACE_ENTRY; COM_INTERFACE_ENTRY_TEAR_OFF; DECLARE_GET_CONTROLLING_UNKNOWN; DECLARE_NOT_AGGREGATABLE; DECLARE_REGISTRY; END_COM_MAP; FinalConstruct; IDispatchImpl; ISupportErrorInfo; PostThreadMessage; return Error; SysAllocString; THREADFLAGS_BOTH

Note

Some of the samples, such as this one, have not been modified to reflect the changes in the Visual C++ wizards, libraries, and compiler, but still demonstrate how to complete your desired task.