Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Obtaining names and positions for shortcuts located on the Windows Desktop
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Printing Image File, programmatically set print page orientation to landscape
Displaying icons in the system tray (VFP9)
Enumerating devices installed on the local machine
Capturing keyboard activity of another application with the Raw Input API (VFP9)
How to change display settings: screen resolution, screen refresh rate
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Displaying dimmed window behind VFP top-level form
How to display Windows On-Screen Keyboard
How to control Adobe Reader 9.0 (SDI mode) from VFP application
Reading and setting explicit Application User Model ID for the current process (Win7)
Switching between keyboard layouts
GDI+: Creating thumbnails to preview images in a directory
Finding out if the current user is the Guest account
GDI+: creating a gradient
Using EnumPrinters function to enumerate locally installed printers
Displaying Windows shell folders in TreeView control with Visual FoxPro FLL
Browsing Windows Known Folders (Special Folders)
Detecting changes in connections to removable drives (VFP9)
Displaying hypertext links with the SysLink control (VFP9, Comctl32.dll)
Reading and setting system access privileges for the current process
Customizing the frame of top-level form: removing the standard frame (VFP9, Vista)
How to register custom Event Log source
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)
    #DEFINE MAX_PREFERRED_LENGTH -1
    
        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)
        ELSE
            nResult = NetUserGetLocalGroups(cServer, cUser, 0,0,;
                @hBuffer, MAX_PREFERRED_LENGTH, @nReadCount, @nTotalCount)
        ENDIF
    
        IF nResult <> 0 Or hBuffer=0
            = NetApiBufferFree(hBuffer)
            ? "Error code:", nResult
            RETURN
        ENDIF
    
        * 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)
        ENDFOR
        = 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  
    Visits in 7 days: 28  
    Listed functions:
    GetUserName
    GlobalSize
    NetApiBufferFree
    NetApiBufferSize
    NetUserGetGroups
    NetUserGetLocalGroups
    Printer friendly API declarations
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