Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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Capturing keyboard activity of another application with the Raw Input API (VFP9)
Converting Unicode data from the Clipboard to a character string using a given code page
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Enumerating data formats currently available on the clipboard
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Current keyboard type
Storing content of the Clipboard to a bitmap file
Custom HttpRequest class (WinINet)
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Displaying icons in the system tray (VFP9)
Storing screen shot of a form to bitmap file
Using Beep and Sleep functions to make the old tin buzz sing (WinNT only?)
How to activate Windows Calculator
Obtaining current Internet Explorer browser version and UserAgent
Using EnumPrinters function to enumerate locally installed printers
Attaching menu to a top-level form
How to print a bitmap file
Using InternetSetFilePointer when resuming interrupted download from the Internet
Using Path functions from Shell Lightweight Utility APIs (shlapi.dll)
Creating a clipping region from the path selected into the device context of a form
Drawing Windows predefined bitmaps using the LoadBitmap functions
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: 94  
    Listed functions:
    GetUserName
    GlobalSize
    NetApiBufferFree
    NetApiBufferSize
    NetUserGetGroups
    NetUserGetLocalGroups
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