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Microsoft KB Archive/107982

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Knowledge Base

Article ID: 107982

Article Last Modified on 8/9/2004


  • Microsoft OLE 2.03
  • Microsoft OLE 4.0, when used with:
    • Microsoft Windows NT 4.0
    • Microsoft Windows NT 3.51 Service Pack 5
    • Microsoft Windows 95

This article was previously published under Q107982


AutoDll.exe demonstrates how to create a OLE automation inproc object.


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AutoDll.exe implements a OLE automation inproc object (DLL server) called Hello that exposes one property, HelloMessage, and one method, SayHello. It uses an OLE provided IDispatch implementation that is created using CreateStdDispatch.

The AUTODLL dynamic-link library (DLL) uses the memory allocator used by the calling task. This is required of all inproc objects. The new and delete operators are redefined to use the calling task's memory allocator and all memory management is done using the redefined new and delete.

The interface that AUTODLL exposes is described using an object description language (HELLO.ODL). The mktyplib tool is used to create a type library (HELLO.TLB) from HELLO.ODL. CreateStdDispatch is then used to implement an IDispatch interface using the interface description in the type library.

AUTODLL exports DllGetClassObject, which is called by OLE to get the class factory. OLE uses this classfactory to create a Hello object. Automation controllers use the IDispatch interface exposed by the Hello object to access its property and method. AUTODLL also exports DllCanUnloadNow.

The SIMPAUTO sample in the Software/Data library demonstrates the implementation of an automation object with the same methods and properties as AUTODLL, but which is an EXE. The main differences between the two samples are in the MAIN.CPP file.

To Run

The Hello object exposes the following:

   ProgID : SimpleAutomationInProc.Hello
   Method and Property Names       Notes
   HelloMessage  (prop)          Sets and returns string.
   SayHello    (method)          Displays HelloMessage in an edit

Update the path in HELLO.REG to the current location of the object and the type library.

To Compile

Requires OLE 2.01 or later.

Include device=vmb.386 in the [386Enh] section of SYSTEM.INI.
NOTE: vmb.386 can be found in \OLE2\BIN. Run the WXSERVER.EXE from \OLE2\BIN before running the makefile.

   File        Function

   MAIN.CPP    Does initialization, redefines new and delete, implements
               DllGetClassObject, DllCanUnloadNow. and contains code that
               calls CreateStdDispatch.
   HELLO.CPP   Implements the HELLO object.
   HELLOCF.CPP Implements the HELLO class factory.
   HELLO.ODL   Object Description Language that describes the property and
               method that HELLO exposes.
   HELLO.H     Defines the HELLO object and the class factory.
   TLB.H       Header file created by mktyplib.
   MAKEFILE    Makefile for project.
   VB.FRM      Visual Basic project files to control this sample.

Additional query words: server

Keywords: kbdownload kbfile kbautomation kbsample KB107982