CODEWITHSUNDEEP
cwindowswinapi
iskorum
iskorum

Reputation: 1137

Usage of NetGroupGetUsers

I want to get users of a group using NetGroupGetUsers function.

DWORD dwError = 0;
NET_API_STATUS nStatus;
LPDWORD entriesread=0;
LPDWORD totalentries=0;
LPBYTE *buff;
nStatus=NetGroupGetUsers(NULL,L"Users",0,buff,MAX_PREFERRED_LENGTH,
                          entriesread,totalentries,NULL);

When i use this i get this error;

xC0000005: Access violation reading location 0xffffffffffffffff.

And how can i read buff when it works? And also i tried this;

GROUP_USERS_INFO_0 *buff;
nStatus=NetGroupGetUsers(NULL,L"Users",0,(LPBYTE*)&buff,MAX_PREFERRED_LENGTH,
entriesread,totalentries,NULL);

but same error occurred.

EDIT: nStatus value is NERR_GroupNotFound i think the reason of the access violation is trying to read buff which isn't actually set.

EDIT 2: i used this function NetLocalGroupGetMembers. now it gives success but the buff->grui0_name is meaningless. there is a user named "ali" but the value of the buff->grui0_name is just "d". WHAT AM I DOING WRONG?

The Last Code;

LPCWSTR TargetGroup = L"group1";

DWORD dwError = 0;
NET_API_STATUS stat;

GROUP_USERS_INFO_0 *buff;
LPDWORD entriesread=new DWORD;
LPDWORD totalentries=new DWORD;

stat=NetGroupGetUsers(NULL,TargetGroup,0,(LPBYTE *)&buff,MAX_PREFERRED_LENGTH,
                          entriesread,totalentries,NULL);

for EDIT 2;

stat=NetLocalGroupGetMembers(NULL,TargetGroup,0,(LPBYTE *)&buff,
                  MAX_PREFERRED_LENGTH,entriesread,totalentries,NULL);

Please help...

Upvotes: 0

Views: 2660

Answers (3)

Tobias Wollgam
Tobias Wollgam

Reputation: 789

Here is the version without new:

LPCWSTR TargetGroup = L"group1";

NET_API_STATUS stat;

LOCALGROUP_MEMBERS_INFO_1 *buff;
DWORD entriesread;
DWORD totalentries;

stat = NetLocalGroupGetMembers(NULL,TargetGroup,1,(LPBYTE *)&buff,
    MAX_PREFERRED_LENGTH,&entriesread,&totalentries,NULL);

wprintf(buff->lgrmi1_name);

Upvotes: 1

iskorum
iskorum

Reputation: 1137

LPCWSTR TargetGroup = L"group1";

NET_API_STATUS stat;

LOCALGROUP_MEMBERS_INFO_1 *buff;
LPDWORD entriesread=new DWORD;
LPDWORD totalentries=new DWORD;

stat=NetLocalGroupGetMembers(NULL,TargetGroup,1,(LPBYTE *)&buff,
                        MAX_PREFERRED_LENGTH,entriesread,totalentries,NULL);



wprintf(buff->lgrmi1_name);

This code is working great now. Thanks to everybody.

Upvotes: 0

Raymond Chen
Raymond Chen

Reputation: 45172

You haven't allocated any memory for buff. You should be writing

GROUP_USERS_INFO_0 *buff;
... NetGroupGetUsers(..., (LPBYTE*)&buff, ...);

otherwise you're telling NetGroupGetUsers to write the results to a garbage location. Note that the bufptr parameter is documented as [out]. That means that it is the caller's responsibility to specify where the result should go. There's more to calling a function than just getting the types to match.

I'm surprised you didn't get an "use of initialized variable" warning from the compiler.

Upvotes: 1

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