Using Win32 functions in Visual FoxPro Image Gallery
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Obtaining names of local and global groups for current user (WinNT/XP/2K)

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Before you begin:
See also:
  • Enumerating global and local group accounts on a server (WinNT/XP/2K)
  • Enumerating sessions established on a server

  • DO decl
    cServer = ""  && empty value means local computer
    *cServer = "\\MYSERVER"
    cUser = GetUsrName()  && current user
    = ListGroups(cServer, cUser)  && local groups
    = ListGroups(cServer, cUser, .T.)  && global groups
    * end of main
    PROCEDURE ListGroups(cServer, cUser, lGlobal)
        LOCAL hBuffer, nBufsize, nReadCount, nTotalCount, nResult,;
            cBuffer, nIndex, nPtr, nOffs, nLen, cGroup
        STORE 0 TO nReadCount, nTotalCount, hBuffer
        cServer = StrConv(cServer+Chr(0), 5)
        cUser = StrConv(cUser+Chr(0), 5)
        IF lGlobal
            nResult = NetUserGetGroups(cServer, cUser, 0,;
                @hBuffer, MAX_PREFERRED_LENGTH, @nReadCount, @nTotalCount)
            nResult = NetUserGetLocalGroups(cServer, cUser, 0,0,;
                @hBuffer, MAX_PREFERRED_LENGTH, @nReadCount, @nTotalCount)
        IF nResult <> 0 Or hBuffer=0
            = NetApiBufferFree(hBuffer)
            ? "Error code:", nResult
        * size of the buffer allocated by the system
        * GlobalSize on Windows XP returns same result
        nBufsize = 0
        = NetApiBufferSize(hBuffer, @nBufsize)
        * copying data from memory buffer to FoxPro string
        cBuffer = Repli(Chr(0), nBufsize)
        CopyMemory(@cBuffer, hBuffer, nBufsize)
        * scanning group names
        FOR nIndex=1 TO nTotalCount
            * retrieving 4-byte (DWORD) address of Unicode string
            * that specifies the group name
            nPtr = buf2dword(SUBSTR(cBuffer, (nIndex-1)*4+1,4))
            * matching memory addresses to cBuffer string
            nOffs = nPtr - hBuffer + 1
            cGroup = SUBSTR(cBuffer, nOffs)+Chr(0)+Chr(0)
            nLen = AT(Chr(0)+Chr(0), cGroup)
            cGroup = SUBSTR(cGroup, 1, nLen)
            ? nIndex, StrConv(cGroup, 6)
        = NetApiBufferFree(hBuffer)
    FUNCTION GetUsrName
    * actually SYS(0) is Ok too :)
        LOCAL cBuffer, nBufsize
        nBufsize = 32
        cBuffer = Repli(Chr(0), nBufsize)
        = GetUserName(@cBuffer, @nBufsize)
    RETURN STRTRAN(cBuffer, Chr(0), "")
    PROCEDURE decl
        DECLARE INTEGER NetUserGetGroups IN netapi32;
            STRING servername, STRING username, INTEGER lvl,;
            INTEGER @bufptr, INTEGER prefmaxlen,;
            INTEGER @entriesread, INTEGER @totalentries
        DECLARE INTEGER NetUserGetLocalGroups IN netapi32;
            STRING servername, STRING username, INTEGER lvl,;
            INTEGER flgs, INTEGER @bufptr, INTEGER prefmaxlen,;
            INTEGER @entriesread, INTEGER @totalentries
        DECLARE INTEGER GetUserName IN advapi32;
            STRING  @lpBuffer, INTEGER @nSize
        DECLARE RtlMoveMemory IN kernel32 As CopyMemory;
            STRING @dst, INTEGER src, INTEGER bufsize
        DECLARE INTEGER NetApiBufferFree IN netapi32 INTEGER buffer
        DECLARE INTEGER NetApiBufferSize IN netapi32;
            INTEGER Buffer, INTEGER @ByteCount
    FUNCTION buf2dword(lcBuffer)
    RETURN Asc(SUBSTR(lcBuffer, 1,1)) + ;
        BitLShift(Asc(SUBSTR(lcBuffer, 2,1)),  8) +;
        BitLShift(Asc(SUBSTR(lcBuffer, 3,1)), 16) +;
        BitLShift(Asc(SUBSTR(lcBuffer, 4,1)), 24)

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    2866 bytes  
    Created: 2003-12-05 20:41:44  
    Modified: 2011-12-10 09:20:22  
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