add current/selected user to a group

Question

can anyone tell me how can I (programatically) add the current/selected user to a group (like power user, backup opetarors)

any function/info/code is welcomed

Answer 1

Well if all you want to do is add a user to a local group then you want the NetLocalGroupAddMembers API (to do it in C anyway).

As a simple example:

LOCALGROUP_MEMBERS_INFO_3 member[1];

// Add using fully qualified name, could also use SID with LOCALGROUP_MEMBERS_INFO_0
member[0].lgrmi3_domainandname = L"MAIN\\username";

status = NetLocalGroupAddMembers(NULL, L"Power Users", 3, (LPBYTE)member, 1);

The group name is just the textual name of the group on the system which you can determine programatically using something like:

PLOCALGROUP_INFO_0 groups = NULL;
DWORD dwCount = 0;
DWORD dwTotalCount = 0;

NET_API_STATUS status = NetLocalGroupEnum(NULL, 0, (LPBYTE*)&groups, MAX_PREFERRED_LENGTH, &dwCount, &dwTotalCount, NULL);

if(status == NERR_Success)
{
    for(DWORD i = 0; i < dwCount; i++)
    {
        printf("%ls\n", groups[i].lgrpi0_name);
    }
    NetApiBufferFree(groups);
}
else
{
    printf("Error %d\n", status);
}

Adding to global group you will need to instead use the NetGroupAddUser API.