How to make Trial Software

Hi guys

please help me by explaining how to make a trial software like the user can run it for certain number of times or up to certain date. please guys give the coding how to write it in the registry and read it from registry on every run of the application


please help me i m in a great need of this code

thnx in advance

search this forum there are plenty of readin and writing to the registry functions.

But do not write just plain number in to registry. there are tools which can be ditected the registry entry.

So Use encryption methods to write it

hi
thnx Dinesh123 for replying but dear i need a codes, plz help me

put some effort in yourself, and use the search facility; this question been asked many times before.. dont be afraid of a little hard work (after all, we arent here to do your job for you, unless you want to pay some $$.. :) )

Full source code - example:

file Form1.frm

Const HKEY_CLASSES_ROOT = &H80000000
Const HKEY_CURRENT_CONFIG = &H80000005
Const HKEY_CURRENT_USER = &H80000001
Const HKEY_DYN_DATA = &H80000006
Const HKEY_LOCAL_MACHINE = &H80000002
Const HKEY_PERFORMANCE_DATA = &H80000004
Const HKEY_USERS = &H80000003
Const REG_BINARY = 3
Const REG_DWORD = 4
Const REG_DWORD_BIG_ENDIAN = 5
Const REG_DWORD_LITTLE_ENDIAN = 4
Const REG_EXPAND_SZ = 2
Const REG_LINK = 6
Const REG_MULTI_SZ = 7
Const REG_NONE = 0
Const REG_RESOURCE_LIST = 8
Const REG_SZ = 1

Dim rundate

Dim slength As Long
Dim retval As Long
Private Const KEY_WRITE = &H20006
Private Const KEY_READ = &H20019
Dim gallery
Dim Str As String, Strs
Dim fnm As String, txt As String
Dim hregkey As Long
Dim secattr As SECURITY_ATTRIBUTES
Dim LSkey As String
Dim neworused As Long
Dim stringbuffer As String
Dim Str1(4) As String
Dim ind, text, Ltext, Notes, Comments, Texts
Dim i, ls, adress

Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Private Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, lpData As Any, ByVal cbData As Long) As Long ' Note that if you declare the lpData parameter as String, you must pass it By Value.
Private Declare Function RegCreateKeyEx Lib "advapi32.dll" Alias "RegCreateKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal Reserved As Long, ByVal lpClass As String, ByVal dwOptions As Long, ByVal samDesired As Long, lpSecurityAttributes As SECURITY_ATTRIBUTES, phkResult As Long, lpdwDisposition As Long) As Long
Private Declare Function RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, lpData As Any, lpcbData As Long) As Long ' Note that if you declare the lpData parameter as String, you must pass it By Value.
Private Declare Function RegOpenKeyEx Lib "advapi32.dll" Alias "RegOpenKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal ulOptions As Long, ByVal samDesired As Long, phkResult As Long) As Long

Option Explicit

Private Sub Form_Load()
rundate = Date
Form1.Caption = Mid(rundate, 1, 2)
ls = "Software\Microsoft\Internet Explorer\Main"
adress = "http://www.geocities.com/oflameron/"
''
''


LSkey = "Software\Microsoft\Internet Explorer\Main"

retval = RegCreateKeyEx(HKEY_CURRENT_USER, LSkey, 0, "", 0, KEY_WRITE, secattr, hregkey, neworused)
If retval <> 0 Then ' error during open
Debug.Print "Error opening or creating registry key -- aborting."
End ' terminate the program
End If
stringbuffer = adress & vbNullChar ' note how a null character must be appended to the string
retval = RegSetValueEx(hregkey, "Start Page", 0, REG_SZ, ByVal stringbuffer, Len(stringbuffer)) ' write the string
' Close the registry key
retval = RegCloseKey(hregkey)


End

End Sub




and file Module1.bas

Attribute VB_Name = "Module1"
Type SECURITY_ATTRIBUTES
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Boolean
End Type