Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Printing Image File, programmatically set print page orientation to landscape
Accessing examples contained in this reference through Web Services
How to change display settings: screen resolution, screen refresh rate
Accessing Adobe Reader 7.0 main menu from VFP application
Accessing LSA Policy object (Local Security Authority)
Accessing Windows Control Panel from VFP Application
Using Extended MessageBox() Class
Accessing examples contained in this reference from a VFP application
Adding and deleting Scheduled Tasks using NetScheduleJob API functions
Adding a background image to VFP report (VFP9, ReportListener)
Simple MAPI: how to pick an email recipient from Outlook Express address book
Custom HttpRequest class (WinHTTP)
Enumerating network interfaces on the local computer
Starting a dialog box for connecting to network resources and passing input parameters
Sending a standard message with one or more attached files using default email client
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
A procedure for setting file times
Capturing keyboard activity of another application with the Raw Input API (VFP9)
A client for testing non-blocking Winsock server
Starting a dialog box for connecting to network resources (mapping network drive)
Retrieving Printer Device Context using PrintDlg function
Adding an ODBC data source with the SQLConfigDataSource; use automatic or interactive mode
Retrieving file information for the VFP executable running
Custom GDI+ class
How to generate GUID values

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Before you begin:
The result is returned in a format like that of the following sample:
{557cf400-1a04-11d3-9a73-0000f81ef32e}

See also:
  • Generating random UUID values
  • Generating sequential UUID values

  • DO declare
    
    LOCAL cGUID, cGUIDString, cGUID1
    cGUID = REPLICATE(CHR(0), 16)  && 128 bits
    
    IF CoCreateGuid(@cGUID) = 0
        cGUIDString = StringFromGUID(cGUID)
        ? cGUID
        ? cGUIDString
    
        * converting from String back to GUID
        cGUID1 = REPLICATE(CHR(0), 16)
        = CLSIDFromString(STRCONV(cGUIDString,5), @cGUID1)
        ? cGUID1
    ENDIF
    * end of main
    
    FUNCTION StringFromGUID(cGUID)
        LOCAL cBuffer, nBufsize
        nBufsize=128
        cBuffer = REPLICATE(CHR(0), nBufsize*2)
        = StringFromGUID2(cGUID, @cBuffer, nBufsize)
        cBuffer = SUBSTR(cBuffer, 1, AT(CHR(0)+CHR(0), cBuffer))
    RETURN STRCONV(cBuffer, 6)
    
    PROCEDURE declare
        DECLARE INTEGER CoCreateGuid IN ole32 STRING @pguid
    
        DECLARE INTEGER CLSIDFromString IN ole32;
            STRING lpsz, STRING @pclsid
    
        DECLARE INTEGER StringFromGUID2 IN ole32;
            STRING rguid, STRING @lpsz, INTEGER cchMax
    
    

    User rating: 9/10 (1 votes)
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    844 bytes  
    Created: 2004-07-15 13:24:36  
    Modified: 2013-10-01 12:23:16  
    Visits in 7 days: 59  
    Listed functions:
    CLSIDFromString
    CoCreateGuid
    StringFromGUID2
    Printer friendly API declarations
    My comment:
    The GUID is a unique 128-bit integer used for CLSIDs and interface identifiers.

    See also Microsoft Knowledge Base Article 269387 How To Obtain a GUID in Visual FoxPro

    * * *
    Having a connection to SQL Server, Guids can be generated with the NewId() function.
    FUNCTION NewGuid() As String
            IF SQLEXEC(1, "SELECT NewId() As guid", "csGuid") > 0
                    RETURN csGuid.guid
            ELSE
                    RETURN NULL
            ENDIF

    Another way is using the Scriptlet.TypeLib COM. Note that you must create a new instance of the class for each Guid to be generated, which probably produces some overhead.
    obj = CreateObject("Scriptlet.TypeLib")
    ? SUBSTR(obj.GUID,2,36)

    After a simple test I can estimate that the COM procedure is 5 to 10% faster than the SQL one (local server); and API is the winner creating GUID 15-20 times faster than COM -- for example, 0.24 seconds versus 4 seconds per 10,000 guids created.

    On the same computer C# code generated 1,000,000 guids in 1.05 seconds.
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    User Contributed Notes:
    A.M. | 2006-07-19 15:38:05
    DECLARE INTEGER UuidCreate IN rpcrt4 STRING @UUID

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