RegOpenUserClassesRoot fails with "system cannot find the specified file"

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I wanna access some subkey under HKEY_CLASSES_ROOT in my atl windows service.
the msdn says below:

"A service should not access HKEY_CURRENT_USER or HKEY_CLASSES_ROOT, especially when impersonating a user. Instead, use the RegOpenCurrentUser or RegOpenUserClassesRoot function.

If you attempt to access HKEY_CURRENT_USER or HKEY_CLASSES_ROOT from a service it may fail, or it may appear to work but there is an underlying leak that can lead to problems loading or unloading the user profile.
"

So I use OpenProcessToken() to get token of the process, then call RegOpenUserClassesRoot() to try to get access to the HKEY_CLASSES_ROOT key. But the call fails with error 0x00000002, says "system cannot find the specified file".

anyone got any idea why this call fails? and how i can access HKEY_CLASSES_ROOT in my atl service?

thanks.

Posted 1-Aug-11 17:39pm

ericchan1336

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barneyman · Answer 1 · 2011-08-01T21:07:00

Solution 1

How about using HKLM\software\classes as a pseudonym for HKCR ?

I wasn't aware there was a potential problem accessing the HKCR from services; I have services that are continually battering away at HKLM

Posted 1-Aug-11 21:07pm

barneyman

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ericchan1336 2-Aug-11 22:47pm

sorry barneyman HKCR is the only key I wanna access to.

barneyman 2-Aug-11 23:41pm

HKLM\software\classes == HKCR

ericchan1336 3-Aug-11 5:13am

no no no it's not what you say