I don't want to use it, but in case it helps anyone, I found that in XP (and probably newer Windows versions), there is a binary in SYSTEM32 called eventcreate.exe that will write to the EventLog with a custom source name without the same error I've been getting. This is an example usage: eventcreate /ID 1 /L APPLICATION /SO MyAppName /T INFORMATION /D "This is a test entry in the EventLog."

And extending on the idea of using eventcreate.exe, you can use it in a different way: using it as the source of your EventLog messages in the registry. Here is what works for me (import into registry after modifying your app name:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Applica
+tion\MyAppName]
"EventMessageFile"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52
+,00,6f,\
  00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00
+,32,00,\
  5c,00,45,00,76,00,65,00,6e,00,74,00,43,00,72,00,65,00,61,00,74,00,65
+,00,2e,\
  00,65,00,78,00,65,00,00,00
"TypesSupported"=dword:00000007
"CustomSource"=dword:00000001

[download]

While I ask a lot of Win32 questions, I hate Windows with a passion. That's the problem with writing a cross-platform program. I'm a Linux user myself. I wish more people were.
If you want to do evil, science provides the most powerful weapons to do evil; but equally, if you want to do good, science puts into your hands the most powerful tools to do so.
- Richard Dawkins

In reply to Re^3: Write to Win32 Event Log, get "/AUXSOURCE=" error by wilsond
in thread [fixed] Write to Win32 Event Log, get "/AUXSOURCE=" error by wilsond

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