ZwOpenKey Failure

OSR_Community_User · June 15, 2002, 11:05am

Hi:
My program use ZwOpenKey to open registry key,but return failure.

OBJECT_ATTRIBUTES oa;
HANDLE hkey;

UNICODE_STRING RegistryPath;

RtlInitUnicodeString(RegistryPath,\Registry\Machine\SYSTEM\CurrentControlSet\Services\Tcpip)

InitializeObjectAttributes(&oa, &RegistryPath, 0, NULL, NULL);

status = ZwOpenKey(&hkey, KEY_READ, &oa);

//return status is not STATUS_SUCCESS why???

Jayadev · June 16, 2002, 10:48am

If your code snippet is same as what I see, then there is a problem in this line

> RtlInitUnicodeString(RegistryPath,\Registry\Machine\SYSTEM\CurrentControlSet\Services\Tcpip)

The first parameter is address of UNICODE_STRING variable. Hence the name is not build properly.
Append L" before the strings starts and end with "

I guess, you would be getting 0xC0000034 - STATUS_OBJECT_NOT_FOUIND as error for the call to
ZwOpenKey( ).

Do check what is the content of the UNICODE_STRING after the call to RtlInitUnicodestring( ) before U
put some hypothesis.

If it still doesnot work after this, check using ZwCreateKey( ) where in U can use addition flags.

---------------------------------- Modified code --------------------------------
OBJECT_ATTRIBUTES oa;
HANDLE hkey;
UNICODE_STRING RegistryPath;

RtlInitUnicodeString(&RegistryPath,L"\Registry\Machine\SYSTEM\CurrentControlSet\Services\Tcpip")

InitializeObjectAttributes(&oa, &RegistryPath, (OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE), NULL, NULL);
status = ZwOpenKey(&hkey, KEY_READ, &oa);

Cheers,

----- Original Message -----
From: square
To: NT Developers Interest List
Sent: Saturday, June 15, 2002 4:03 PM
Subject: [ntdev] ZwOpenKey Failure