Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Transparent Menu Class (requires VFP9)
Using NetWkstaTransportEnum to obtain MAC Address of remote server
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
Exporting DLL icon resources as .ICO files
GDI+: printing vertical text on VFP reports via generated images (VFP9)
GDI+: Storing content of the Clipboard to a bitmap file
How to assemble an array of strings and pass it to external function
How to display the Properties dialog box for a file (ShellExecuteEx)
How to generate GUID values
Obtaining heap handles and enumerating memory blocks for the current VFP session (WinNT only)
Reading security permissions for NTFS files and folders
How to draw custom Window Caption on FoxPro form
How to initiate System shutdown
How to ping a remote site using ICMP API calls
How to view icons stored in executable files (Icon Viewer)
Storing screen shot of a form to enhanced metafile (*.emf)
Using FlashWindowEx to flash the taskbar button of the VFP application
Using FrameRgn for displaying system colors
Winsock: connecting to a news server (NNTP, port 119)
Copying files as a transacted operation (Vista)
Obtaining physical parameters for a drive: sectors, clusters, cylinders...
Printing text on the main VFP window
Reading and setting the priority class values for the current process and thread
How to enumerate terminal servers within the specified Windows domain

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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: 56  
    Listed functions:
    GetLastError
    GlobalSize
    WTSEnumerateServers
    WTSFreeMemory
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