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"mataus" <mataus@gmail.com> wrote in message 
news:4797d1c8@newsgroups.borland.com...

> I nned to get a users SID (as text) where i have username. I no
> i use LookupAccountName api but i am confussed with the
> syntax - does anyone have code to do this?

    BOOL GetTextualSid(PSID pSid, LPTSTR TextualSid, LPDWORD lpdwBufferLen)
    {
        if( !IsValidSid(pSid) )
            return FALSE;

        PSID_IDENTIFIER_AUTHORITY psia = GetSidIdentifierAuthority(pSid);
        DWORD dwSubAuthorities = *GetSidSubAuthorityCount(pSid);

        DWORD dwSidSize = (15 + 12 + (12 * dwSubAuthorities) + 1) * 
sizeof(TCHAR);

        if( *lpdwBufferLen < dwSidSize )
        {
            *lpdwBufferLen = dwSidSize;
            SetLastError(ERROR_INSUFFICIENT_BUFFER);
            return FALSE;
        }

        DWORD dwSidRev = SID_REVISION;
        dwSidSize = wsprintf(TextualSid, TEXT("S-%lu-"), dwSidRev);

        if( (psia->Value[0] != 0) || (psia->Value[1] != 0) )
        {
            dwSidSize += wsprintf(TextualSid + lstrlen(TextualSid),
                TEXT("0x%02hx%02hx%02hx%02hx%02hx%02hx"),
                (USHORT) psia->Value[0],
                (USHORT) psia->Value[1],
                (USHORT) psia->Value[2],
                (USHORT) psia->Value[3],
                (USHORT) psia->Value[4],
                (USHORT) psia->Value[5]);
        }
        else
        {
            dwSidSize += wsprintf(TextualSid + lstrlen(TextualSid),
                TEXT("%lu"),
                (ULONG) (psia->Value[5]      )   +
                (ULONG) (psia->Value[4] <<  8)   +
                (ULONG) (psia->Value[3] << 16)   +
                (ULONG) (psia->Value[2] << 24)   );
        }

        for (DWORD dwCounter = 0; dwCounter < dwSubAuthorities; ++dwCounter)
        {
            dwSidSize += wsprintf(TextualSid + dwSidSize,
                TEXT("-%lu"),
                *GetSidSubAuthority(pSid, dwCounter));
        }

        return TRUE;
    }

    void UserNameToSid(LPTSTR UserName)
    {
        DWORD dwSidSize = 0;
        TCHAR szDomain[128] = {0};
        DWORD dwDomainSize = 128;
        SID_NAME_USE SidType;

        LookupAccountName(NULL, UserName, NULL, &dwSidSize, szDomain, 
&dwDomainSize, &SidType);
        if( GetLastError() == ERROR_INSUFFICIENT_BUFFER )
        {
            PSID pSid = (PSID) LocalAlloc(LMEM_FIXED, dwSidSize);
            if( pSid )
            {
                ZeroMemory(szDomain, sizeof(szDomain));
                dwDomainSize = 128;

                if( LookupAccountName(NULL, UserName, pSid, &dwSidSize, 
szDomain, &dwDomainSize, &SidType) )
                {
                    dwSidSize = 0;
                    GetTextualSid(pSid, NULL, &dwSidSize);

                    if( GetLastError() == ERROR_INSUFFICIENT_BUFFER )
                    {
                        LPTSTR lpSidStr = (LPTSTR) LocalAlloc(LMEM_FIXED, 
dwSidSize);
                        if( lpSidStr )
                        {
                            GetTextualSid(pSid, lpSidStr, &dwSidSize);

                            // use pSid, lpSidStr, szDomain, and SidType as 
needed...

                            LocalFree(lpSidStr);
                        }
                    }
                }

                LocalFree(pSid);
            }
        }
    }


Gambit 

Hi Remy, just saw your post and I've got a couple of questions about the 
code you have shown.  I've used a similar system in the past to get the 
computer SID but I'm not 100% on how it works.

1) Why have you coded the GetTextualSid instead of using the 
ConvertSidToStringSid?  Does it have any advantages doing it your way?

2) Why do you use LocalFree?  In my implementation i use GlobalFree - what 
is the difference in using these two?

Thanks in advance,

Mike C



"Remy Lebeau (TeamB)" <no.spam@no.spam.com> wrote in message 
news:4797e247$1@newsgroups.borland.com...
>
> "mataus" <mataus@gmail.com> wrote in message 
> news:4797d1c8@newsgroups.borland.com...

"Mike Collins" <its@TheBottomOfThePost> wrote in message 
news:4798a5a6$1@newsgroups.borland.com...

> 2) Why do you use LocalFree?  In my implementation i use GlobalFree - what 
> is the difference in using these two?

In earlier versions of windows (16-bit), GlobalAlloc allocated memory from 
the global heap while LocalAlloc allocated memory from the local heap. 
However, in Win32, there is no difference between the global and local heaps 
so, as I understand it, the Global/Local functions have identical behavior.

- Dennis 

"Mike Collins" <its@TheBottomOfThePost> wrote in message 
news:4798a5a6$1@newsgroups.borland.com...

> Why have you coded the GetTextualSid instead of using
> the ConvertSidToStringSid?

1) GetTextualSid() is provided in MSDN's own examples, and keeps showing up 
in newsgroup postings, even from Microsoft MVPs.

2) ConvertSidToStringSid() is not available on NT

If you have ConvertSidToStringSid() available on your machine, you can 
certainly use it.

> Why do you use LocalFree?

Because I use LocalAlloc().  You can't use GlobalFree() to release memory 
allocated by LocalAlloc().  Microsoft's documentation even says as much:

    LocalAlloc Function
    http://msdn2.microsoft.com/en-us/library/aa366723.aspx

    "It is not safe to free memory allocated with LocalAlloc using 
GlobalFree."

> In my implementation i use GlobalFree - what is the difference
> in using these two?

    Global and Local Functions
    http://msdn2.microsoft.com/en-us/library/aa366596(VS.85).aspx


Gambit