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From "CHANG Shuh" <shuh.ch...@gemalto.com>
Subject RE: NTEventLogAppender with missing description source for Windows Server 2003
Date Thu, 14 Dec 2006 19:41:04 GMT
Hi Curt,

Thanks for the detailed description of the issue, and I apologize if I
had  misinterpreted your earlier response.

I did not have a chance to try to build the DLL file at all -- don't
even have the proper compilation environment yet. I was hoping that
there might be some quick work around to patch the registry directtly,
but I think you are right that it's better to get to the root cause of
the problem -- get the code fixed to properly register the

I don't know if I have enough spare time to look further into the source
code for a fix. If someone knows the code better for a proper fix,
that'll be greatly appreciated. Of course, if I eventually had the time
and figured it out for a solution, I definitely would be glad to post it

Thanks once again for your insights.

- Shuh

> -----Original Message-----
> From: Curt Arnold [mailto:carnold@apache.org] 
> Sent: Wednesday, December 13, 2006 2:14 PM
> To: Log4J Users List
> Subject: Re: NTEventLogAppender with missing description 
> source for Windows Server 2003
> I believe that you misinterpreted my response.  The log4j 
> package does include all files necessary to rebuild 
> NTEventLogAppender.dll, it is not missing any files.  If you 
> run the ant target "build.nt.dll" on Windows with MinGW on 
> the path (I believe that I use MinGW 3.1 or 3.1.1), 
> NTEventLogAppender.dll will be built.  It appears that you 
> were attempting to build the appender without using the build 
> script and did not use javah to create the supposedly missing 
> header files corresponding to the java classes 
> org.apache.log4j.nt.NTEventLogAppender and org.apache.log4j.Priority.
> regsvr32 does not find a DllRegisterServer in 
> NTEventLogAppender.dll since that entry point was never 
> written.  Just having a DllRegisterServer entry point would 
> satisfy regsvr32, but it would not address the unregistered 
> message file issues.
> To enhance the NTEventLogAppender.dll to address your 
> observed complaints, a DllRegisterServer and 
> DllUnregisterServer entry points would need to be added to 
> NTEventLogAppender.dll.  The implementation of 
> DllRegisterServer would need to determine the full path to 
> NTEventLogAppender.dll using GetModuleFileName() and then 
> would need to register the DLL as a message source as 
> described in http:// 
> msdn2.microsoft.com/en-us/library/aa363661.aspx.  The DLL 
> does appear to contain the necessary message resource, it 
> just doesn't appear to have any code that attempts to 
> register itself. What you are experiencing is exactly what is 
> described at the bottom of that page.
> > An application can use the Application log without adding a 
> new event 
> > source to the registry. If the application calls 
> RegisterEventSource, 
> > passing a source name that cannot be found in the registry, the 
> > event-logging service uses the Application log by default. However, 
> > because there are no message files, the Event Viewer cannot map any 
> > event identifiers or event categories to a description string, and 
> > will display an error. For this reason, you should add a 
> unique event 
> > source to the registry for your application and specify a message 
> > file.
> To recap:
> 1. log4j 1.2.14 isn't missing any files.  The files that you 
> thought were missing are generated using javah in the build 
> script.  If you don't use the build script, you have to 
> manually perform all the steps in to compile the message 
> files, resource files, and generate the header files 
> corresponding to the needed java classes.
> 2. The observed behavior isn't a regression.  That is, it 
> didn't stop working, it just never had the necessary code to 
> implement registering itself as an event source.
> 3. The observed behavior isn't desirable.  A patch that added 
> a DllRegisterServer entry point to make the appropriate 
> registry entries would be a helpful contribution as an 
> enhancement.  If anyone would like to take a shot and 
> contribute your work, create a new bug in Bugzilla and then 
> after creating the bug attach a patch file.

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