Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Encapsulating access to the Windows Services in a class
Enumerating the subkeys for a given registry key
Listing child windows for the Windows desktop
Start an executable from VFP application by using the CreateProcess
Starting external program from VFP and waiting for its termination
Testing Clipboard functions: emptying the clipboard
Using the DeleteFile
Adding printer to the list of supported printers for the specified server
Creating the Open dialog box to specify the drive, directory, and name of a file to open
How to display a user-defined icon in the MessageBox dialog
How to play AVI file on the _screen
Reading header information from AVI file
Running MSDOS Shell as a child process with redirected input and output (smarter RUN command)
Setting properties of the window: caption and user-defined value
Winsock: how to retrieve a service information corresponding to a service name
Bitmap Class for Visual FoxPro application
Creating irregularly shaped FoxPro form using transparency color key
Creating two-byte hashes for a list of URLs
Enhanced GetFont dialog
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Pocket PC: Folder Viewer
Retrieveing general information about the driver and data source associated with an ODBC connection
Retrieving the interface–to–IP address mapping table
Storing registration key in the resources of an executable file
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.
    nResult = WTSEnumerateServers(cDomainName, 0, 1, @hBuffer, @nSvrCount)
    IF nResult = 0
    * 1212=invalid domain name/format
        ? "WTSEnumerateServers failed with error:", GetLastError()
    ? "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+"]"
    * 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  
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