Microsoft KB Archive/317276

= Transactional Managered Publisher Does Not Fire Loosely Coupled Event (LCE) =

Article ID: 317276

Article Last Modified on 6/5/2003

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APPLIES TO


 * Microsoft COM+ 1.0, when used with:
 * Microsoft Windows 2000 Standard Edition

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This article was previously published under Q317276



SYMPTOMS
If subscribers subscribe to all methods of an unmanagered event class, and if the publisher calls the unmanagered event class, the publisher may receive the following error message:

System.Runtime.InteropServices.ComException(0x80040201)

&quot;An event was unable to invoke any of its subscribers&quot; exception thrown.

Additionally, the publisher may receive a DISP_E_UNKNOWNNAME error.

The following system event log is logged at the same time:

Event Type:    Warning Event Source:  EventSystem Event Category: Firing Agent Event ID:      4098 Date:          9/6/2001 Time:          10:17:07 AM User:           N/A Computer:      ComputerName

Description: The COM+ Event System failed to fire the GetObjectIdentity method on subscription {E8ABC579-F891-4169-95A5-9F49DC6648A5}. The subscriber returned HRESULT 80020006.



CAUSE
When an event class is created in unmanagered code and is passed to the managed code, Interop obtains this event class and prepares the event class for management services. This includes calling the QueryInterface method on the IManagedObject interface and then calling the GetObjectIdentity function. As a result, the IDispatch interface is checked for the GetObjectIdentity function. Because GetObjectIdentity does not exist in an unmanagered event class, Interop returns a DISP_E_UNKNOWNNAME error to the publisher.



RESOLUTION
To resolve this problem, obtain Microsoft COM+ Hotfix Rollup 18.1. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

313582 INFO: Availability of Windows 2000 Post-Service Pack 2 COM+ Hotfix Rollup Package 18.1

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.

Additional query words: kbIISCom kbWin2000preSP3COMRollup18Fix EC

Keywords: kbbug kbfix kbwin2000presp3fix kbwin2000sp3fix KB317276

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