DOCUMENT:Q175510 05-NOV-2000 [vbwin] TITLE :SAMPLE: VB5DCOM.EXE: Using Callbacks and WithEvents with DCOM PRODUCT :Microsoft Visual Basic for Windows PROD/VER::5.0,6.0 OPER/SYS: KEYWORDS:kbfile kbSample kbDCOM kbVBp500 kbVBp600 kbOSWin98 kbGrpDSVBDB ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0 ------------------------------------------------------------------------------- SUMMARY ======= VB5DCOM.EXE is a Visual Basic sample application that demonstrates how to use WithEvents and CallBacks remotely via DCOM (Distributed Component Object Model). NOTE: Building DCOM Application with Microsoft Visual Basic is only enabled in the Enterprise Editions of Visual Basic 5.0 and 6.0. MORE INFORMATION ================ If you are using Visual Basic 6.0, see the following Microsoft Knowledge Base articles: Q266717 HOWTO: Create a DCOM Client/Server Application by Using Visual Basic Q267836 HOWTO: Create a DCOM Client/Server with Events by Using Visual Basic For additional help on how to set security and how to troubleshoot DCOM issues, see the following articles in the Microsoft Knowledge Base: Q268550 HOWTO: Use Dcomcnfg for a Visual Basic DCOM Client/Server Application Q269330 HOWTO: Troubleshoot DCOM for Visual Basic Client/Server Applications VB5DCOM.EXE also addresses all of the security settings that are required to make DCOM function correctly with Visual Basic using DCOM Config. It even demonstrates how to check a client machines registry to confirm that DCOM is installed on Windows 95 platforms and enabled on Windows NT, Windows 2000, and Windows 98. If DCOM is not present on the Windows 95 machine, then it presents the user with the opportunity to immediately download the necessary DCOM files from the Microsoft Web site. The following file is available for download from the Microsoft Download Center: Vb5dcom.exe (http://download.microsoft.com/download/vb60ent/Sample29/1/W9XNT4/EN-US/Vb5dcom.exe) For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base: Q119591 How to Obtain Microsoft Support Files from Online Services Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file. Place the file Vb5dcom.exe in a root directory of a drive that has at least 150KB of available space. This a self-extracting executable so it will create the proper folders for you and place all the files in their respective locations. Execute the file Vb5dcom.exe. You will now have a DCOMDemo folder with separate Client and Server folders. Open the server project \DCOMDemo\Server\DCOMDemoServer.vbp. In the project's properties, make sure that the "remote server files" option on the component tab is checked and make an executable of the server. The server will now be registered on your machine and you will have a .vbr file containing the registry entries for the server. Close the server project. Open the client project \DCOMDemo\Client\DCOMDemoClient.vbp. Set a reference to the DCOMDemoServer in the projects references. Run the project locally to check for problems before distributing to other machines for testing remotely. See the included file \DCOMDemo\Permissions.txt if you encounter problems (such as Error 70 - Permission denied). REFERENCES ========== For more information about distributing DCOM applications, please see the following article in the Microsoft Knowledge Base: Q161837 HOWTO: Create a DCOM Client/Server Application Q266717 HOWTO: Create a DCOM Client/Server Application by Using Visual Basic Q267836 HOWTO: Create a DCOM Client/Server with Events by Using Visual Basic Q268550 HOWTO: Use Dcomcnfg for a Visual Basic DCOM Client/Server Application Q269330 HOWTO: Troubleshoot DCOM for Visual Basic Client/Server Applications Additional query words: Permissions ====================================================================== Keywords : kbfile kbSample kbDCOM kbVBp500 kbVBp600 kbOSWin98 kbGrpDSVBDB Technology : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbVB500 kbVB600 Version : :5.0,6.0 Issue type : kbinfo ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2000.