Using Win32 functions in Visual FoxPro Image Gallery
Memory Management
..msdn
CopyMemory
FillMemory
GetProcessHeap
GetProcessHeaps
GlobalAlloc
GlobalFree
GlobalLock
GlobalMemoryStatus
GlobalReAlloc
GlobalSize
GlobalUnlock
HeapAlloc
HeapCompact
HeapFree
HeapLock
HeapReAlloc
HeapSize
HeapUnlock
HeapValidate
HeapWalk
LocalAlloc
LocalFree
LocalSize
VirtualAllocEx
VirtualFreeEx
ZeroMemory
Code examples:
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Attaching menu to a top-level form
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Creating the Open dialog box to specify the drive, directory, and name of a file to open
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Displaying dimmed window behind VFP top-level form
Displaying standard progress dialog box when copying files
Displaying system dialog that selects a folder
Dynamic strings implemented through VFP Custom class
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Enumerating files opened on the network
Extensible Storage Engine class library
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How to display the Print property sheet
How to display the Properties dialog box for a file (ShellExecuteEx)
How to enumerate sessions and processes on a specified terminal server
How to enumerate terminal servers within the specified Windows domain
How to enumerate, add and delete shares on the local computer (WinNT/XP)
How to extract frames from AVI files
How to ping a remote site using ICMP API calls
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How to remove a directory that is not empty
How to write and read Window Properties for the specified window
Loading a string resource from an executable file
MapiSendMail class for Visual FoxPro application
Mapping and disconnecting network drives
Obtaining names of local and global groups for current user (WinNT/XP/2K)
Passing data records between VFP applications via the Clipboard
Printing Image File, programmatically set print page orientation to landscape
Reading and setting explicit Application User Model ID for the current process (Win7)
Reading entries from Event logs
Retrieving configuration information for the specified server (Win2000/XP)
Retrieving the command line for the VFP session
Sending email messages with Simple MAPI
Shortcut Menu Class
Starting a dialog box for connecting to network resources and passing input parameters
Storing the environment strings in cursor
URL: splitting into its component parts
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Winsock: connecting to a news server (NNTP, port 119)
Writing entries to custom Event Log
Adding and deleting User Accounts

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Before you begin:
The class below wraps NetUserAdd, NetUserDel, NetUserGetInfo and NetUserSetInfo API calls with methods that can add, delete and modify user accounts on a server.

Use another example, Obtaining information about all user accounts on a server, to review the user accounts.
 
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7151 bytes  
Created: 2005-02-07 19:34:02  
Modified: 2011-12-10 09:20:22  
Visits in 7 days: 139  
Listed functions:
GlobalAlloc
GlobalFree
GlobalSize
NetApiBufferFree
NetApiBufferSize
NetUserAdd
NetUserDel
NetUserGetInfo
NetUserSetInfo
Printer friendly API declarations
My comment:
In VFP versions 3 to 6 you may have to declare RtlMoveMemory as MemToStr and StrToMem not once but every time you call this function with either interface. Newer VFP versions allow at least two API declarations exist simultaneously.

Use this program code to test the class. Replace "MyServer" with an empty string to access user accounts on the local computer.
#DEFINE ERROR_ACCESS_DENIED 5
#DEFINE ERROR_BAD_NETPATH 53
#DEFINE NERR_UserNotFound 2221
#DEFINE NERR_UserExists 2224

LOCAL oUser As UserAccount
oUser = CREATEOBJECT("UserAccount", "MyServer", "FoxApp")

DO CASE

CASE oUser.errorcode = 0
        = MESSAGEBOX("User account " + oUser.GetUsername() +;
                " exists on " + oUser.GetServername() + ". ",;
                64, VERSION())

CASE oUser.errorcode = ERROR_BAD_NETPATH
        = MESSAGEBOX("Server " + oUser.GetServername() +;
                " not found or can not be accessed. ",;
                48, VERSION())

CASE oUser.errorcode = ERROR_ACCESS_DENIED
        = MESSAGEBOX("Access denied to Network " +;
                "Management Functions on " +;
                oUser.GetServername() +;
                ". ", 48, VERSION())

CASE oUser.errorcode = NERR_UserNotFound
        nSelect = MESSAGEBOX("User account " +;
                oUser.GetUsername() +;
                " not found on " + oUser.GetServername() + ". " +;
                CHR(13)+CHR(13) +;
                "Do you want to add this account? ",;
                32+4+256, VERSION())

        IF nSelect = 6
                IF oUser.UserAdd()
                        = MESSAGEBOX("User account " +;
                                oUser.GetUsername() +;
                                " added on " +;
                                oUser.GetServername() + ". ",;
                                64, VERSION())
                ELSE
                        = MESSAGEBOX("Method UserAdd " +;
                                "failed with error code " +;
                                TRANSFORM(oUser.errorcode) + ". ",;
                                48, VERSION())
                ENDIF
        ENDIF
ENDCASE

IF oUser.UserExists()
        oUser.SetComment("Temporary account. Delete after the testing.")
*        oUser.UserDel
ENDIF

* * *
Read an article HOW TO: Add a User to the Local System by Using Directory Services and Visual C# .NET on Microsoft Help and Support web site.
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