Using Win32 functions in Visual FoxPro Image Gallery
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  • How to enumerate sessions and processes on a specified terminal server

  • DO declare
    
    LOCAL cDomainName, hBuffer, nSvrIndex, nSvrCount, nBufsize,;
        cBuffer, nAddress, cSvrName
    
    STORE 0 TO hBuffer, nSvrCount
    
    * The first parameter is the name of Windows domain to be queried.
    * If this parameter is NULL, the current domain is assumed.
    cDomainName=NULL
    *cDomainName="companydomain"
    
    nResult = WTSEnumerateServers(cDomainName, 0, 1, @hBuffer, @nSvrCount)
    
    IF nResult = 0
    * 1212=invalid domain name/format
        ? "WTSEnumerateServers failed with error:", GetLastError()
        RETURN
    ENDIF
    
    ? "Number of terminal servers within the domain:", nSvrCount
    
    * create VFP string variable and allocate amount of space
    * required to store the array of WTS_SERVER_INFO structures
    * created by WTSEnumerateServers function
    nBufsize = GlobalSize(hBuffer)
    cBuffer = REPLICATE(CHR(0), nBufsize)
    = MemToStr(@cBuffer, hBuffer, nBufsize)
    
    *    The array of WTS_SERVER_INFO structures starts with 
    * N DWORD (4-byte) values, where N is the number 
    * of terminal servers detected.
    *    Each value is the address in memory where a terminal server
    * name is stored.
    *    Each terminal server name ends with zero byte.
    
    * retrieve terminal server names from the array
    FOR nSvrIndex=0 TO nSvrCount-1
        nAddress = buf2dword(SUBSTR(cBuffer, nSvrIndex*4+1, 4))
        cSvrName = SUBSTR(cBuffer, nAddress - hBuffer+1)
        cSvrName = SUBSTR(m.cSvrName, 1, AT(CHR(0),cSvrName)-1)
        ? "["+cSvrName+"]"
    NEXT
    
    * release memory implicitly allocated by the WTSEnumerateServers
    = WTSFreeMemory(hBuffer)
    * end of main
    
    PROCEDURE declare
        DECLARE INTEGER GetLastError IN kernel32
        DECLARE WTSFreeMemory IN Wtsapi32 INTEGER pMemory
        DECLARE INTEGER GlobalSize IN kernel32 INTEGER hMem
    
        DECLARE INTEGER WTSEnumerateServers IN Wtsapi32;
            STRING pDomainName, LONG Reserved, LONG RqVersion,;
            LONG @ppServerInfo, LONG @SICount
    
        DECLARE RtlMoveMemory IN kernel32 As MemToStr; 
            STRING @dst, INTEGER src, 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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    2157 bytes  
    Created: 2006-12-29 16:20:17  
    Modified: 2006-12-29 16:33:08  
    Visits in 7 days: 50  
    Listed functions:
    GetLastError
    GlobalSize
    WTSEnumerateServers
    WTSFreeMemory
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