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Dicas
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Visual Basic (Miscelâneas)
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Título da Dica: Fazendo um programa Trial
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Postada em 22/4/2003 por Spectro
Em uma módulo coloque:
Type FILETIME
lLowDateTime As Long
lHighDateTime As Long
End Type
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
Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Declare Function RegDeleteKey Lib "advapi32.dll" Alias "RegDeleteKeyA" (ByVal hKey As Long, ByVal lpSubKey As String) As Long
Declare Function RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, ByVal lpData As String, lpcbData As Long) As Long
Declare Function RegQueryValueExA Lib "advapi32.dll" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, ByRef lpData As Long, lpcbData As Long) As Long
Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, ByVal lpData As String, ByVal cbData As Long) As Long
Declare Function RegSetValueExA Lib "advapi32.dll" (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, ByRef lpData As Long, ByVal cbData As Long) As Long
Declare Function RegSetValueExB Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, ByRef lpData As Byte, ByVal cbData As Long) As Long
Const ERROR_SUCCESS = 0&
Const ERROR_BADDB = 1009&
Const ERROR_BADKEY = 1010&
Const ERROR_CANTOPEN = 1011&
Const ERROR_CANTREAD = 1012&
Const ERROR_CANTWRITE = 1013&
Const ERROR_OUTOFMEMORY = 14&
Const ERROR_INVALID_PARAMETER = 87&
Const ERROR_ACCESS_DENIED = 5&
Const ERROR_NO_MORE_ITEMS = 259&
Const ERROR_MORE_DATA = 234&
Const REG_NONE = 0&
Const REG_SZ = 1&
Const REG_EXPAND_SZ = 2&
Const REG_BINARY = 3&
Const REG_DWORD = 4&
Const REG_DWORD_LITTLE_ENDIAN = 4&
Const REG_DWORD_BIG_ENDIAN = 5&
Const REG_LINK = 6&
Const REG_MULTI_SZ = 7&
Const REG_RESOURCE_LIST = 8&
Const REG_FULL_RESOURCE_DESCRIPTOR = 9&
Const REG_RESOURCE_REQUIREMENTS_LIST = 10&
Const KEY_QUERY_VALUE = &H1&
Const KEY_SET_VALUE = &H2&
Const KEY_CREATE_SUB_KEY = &H4&
Const KEY_ENUMERATE_SUB_KEYS = &H8&
Const KEY_NOTIFY = &H10&
Const KEY_CREATE_LINK = &H20&
Const READ_CONTROL = &H20000
Const WRITE_DAC = &H40000
Const WRITE_OWNER = &H80000
Const SYNCHRONIZE = &H100000
Const STANDARD_RIGHTS_REQUIRED = &HF0000
Const STANDARD_RIGHTS_READ = READ_CONTROL
Const STANDARD_RIGHTS_WRITE = READ_CONTROL
Const STANDARD_RIGHTS_EXECUTE = READ_CONTROL
Const KEY_READ = STANDARD_RIGHTS_READ Or KEY_QUERY_VALUE Or KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY
Const KEY_WRITE = STANDARD_RIGHTS_WRITE Or KEY_SET_VALUE Or KEY_CREATE_SUB_KEY
Const KEY_EXECUTE = KEY_READ
Dim hKey As Long, MainKeyHandle As Long
Dim rtn As Long, lBuffer As Long, sBuffer As String
Dim lBufferSize As Long
Dim lDataSize As Long
Dim ByteArray() As Byte
'This constant determins wether or not to display error messages to the
'user. I have set the default value to False as an error message can and
'does become irritating after a while. Turn this value to true if you want
'to debug your programming code when reading and writing to your system
'registry, as any errors will be displayed in a message box.
Const DisplayErrorMsg = False
Function SetDWORDValue(SubKey As String, Entry As String, Value As Long)
Call ParseKey(SubKey, MainKeyHandle)
If MainKeyHandle Then
rtn = RegOpenKeyEx(MainKeyHandle, SubKey, 0, KEY_WRITE, hKey) 'open the key
If rtn = ERROR_SUCCESS Then 'if the key was open successfully then
rtn = RegSetValueExA(hKey, Entry, 0, REG_DWORD, Value, 4) 'write the value
If Not rtn = ERROR_SUCCESS Then 'if there was an error writting the value
If DisplayErrorMsg = True Then 'if the user want errors displayed
MsgBox ErrorMsg(rtn) 'display the error
End If
End If
rtn = RegCloseKey(hKey) 'close the key
Else 'if there was an error opening the key
If DisplayErrorMsg = True Then 'if the user want errors displayed
MsgBox ErrorMsg(rtn) 'display the error
End If
End If
End If
End Function
Function GetDWORDValue(SubKey As String, Entry As String)
Call ParseKey(SubKey, MainKeyHandle)
If MainKeyHandle Then
rtn = RegOpenKeyEx(MainKeyHandle, SubKey, 0, KEY_READ, hKey) 'open the key
If rtn = ERROR_SUCCESS Then 'if the key could be opened then
rtn = RegQueryValueExA(hKey, Entry, 0, REG_DWORD, lBuffer, 4) 'get the value from the registry
If rtn = ERROR_SUCCESS Then 'if the value could be retreived then
rtn = RegCloseKey(hKey) 'close the key
GetDWORDValue = lBuffer 'return the value
Else 'otherwise, if the value couldnt be retreived
GetDWORDValue = "Error" 'return Error to the user
If DisplayErrorMsg = True Then 'if the user wants errors displayed
MsgBox ErrorMsg(rtn) 'tell the user what was wrong
End If
End If
Else 'otherwise, if the key couldnt be opened
GetDWORDValue = "Error" 'return Error to the user
If DisplayErrorMsg = True Then 'if the user wants errors displayed
MsgBox ErrorMsg(rtn) 'tell the user what was wrong
End If
End If
End If
End Function
Function SetBinaryValue(SubKey As String, Entry As String, Value As String)
Call ParseKey(SubKey, MainKeyHandle)
If MainKeyHandle Then
rtn = RegOpenKeyEx(MainKeyHandle, SubKey, 0, KEY_WRITE, hKey) 'open the key
If rtn = ERROR_SUCCESS Then 'if the key was open successfully then
lDataSize = Len(Value)
ReDim ByteArray(lDataSize)
For i = 1 To lDataSize
ByteArray(i) = Asc(Mid$(Value, i, 1))
Next
rtn = RegSetValueExB(hKey, Entry, 0, REG_BINARY, ByteArray(1), lDataSize) 'write the value
If Not rtn = ERROR_SUCCESS Then 'if the was an error writting the value
If DisplayErrorMsg = True Then 'if the user want errors displayed
MsgBox ErrorMsg(rtn) 'display the error
End If
End If
rtn = RegCloseKey(hKey) 'close the key
Else 'if there was an error opening the key
If DisplayErrorMsg = True Then 'if the user wants errors displayed
MsgBox ErrorMsg(rtn) 'display the error
End If
End If
End If
End Function
Function GetBinaryValue(SubKey As String, Entry As String)
Call ParseKey(SubKey, MainKeyHandle)
If MainKeyHandle Then
rtn = RegOpenKeyEx(MainKeyHandle, SubKey, 0, KEY_READ, hKey) 'open the key
If rtn = ERROR_SUCCESS Then 'if the key could be opened
lBufferSize = 1
rtn = RegQueryValueEx(hKey, Entry, 0, REG_BINARY, 0, lBufferSize) 'get the value from the registry
sBuffer = Space(lBufferSize)
rtn = RegQueryValueEx(hKey, Entry, 0, REG_BINARY, sBuffer, lBufferSize) 'get the value from the registry
If rtn = ERROR_SUCCESS Then 'if the value could be retreived then
rtn = RegCloseKey(hKey) 'close the key
GetBinaryValue = sBuffer 'return the value to the user
Else 'otherwise, if the value couldnt be retreived
GetBinaryValue = "Error" 'return Error to the user
If DisplayErrorMsg = True Then 'if the user wants to errors displayed
MsgBox ErrorMsg(rtn) 'display the error to the user
End If
End If
Else 'otherwise, if the key couldnt be opened
GetBinaryValue = "Error" 'return Error to the user
If DisplayErrorMsg = True Then 'if the user wants to errors displayed
MsgBox ErrorMsg(rtn) 'display the error to the user
End If
End If
End If
End Function
Function DeleteKey(Keyname As String)
Call ParseKey(Keyname, MainKeyHandle)
If MainKeyHandle Then
rtn = RegOpenKeyEx(MainKeyHandle, Keyname, 0, KEY_WRITE, hKey) 'open the key
If rtn = ERROR_SUCCESS Then 'if the key could be opened then
rtn = RegDeleteKey(hKey, Keyname) 'delete the key
rtn = RegCloseKey(hKey) 'close the key
End If
End If
End Function
Function GetMainKeyHandle(MainKeyName As String) As Long
Const HKEY_CLASSES_ROOT = &H80000000
Const HKEY_CURRENT_USER = &H80000001
Const HKEY_LOCAL_MACHINE = &H80000002
Const HKEY_USERS = &H80000003
Const HKEY_PERFORMANCE_DATA = &H80000004
Const HKEY_CURRENT_CONFIG = &H80000005
Const HKEY_DYN_DATA = &H80000006
Select Case MainKeyName
Case "HKEY_CLASSES_ROOT"
GetMainKeyHandle = HKEY_CLASSES_ROOT
Case "HKEY_CURRENT_USER"
GetMainKeyHandle = HKEY_CURRENT_USER
Case "HKEY_LOCAL_MACHINE"
GetMainKeyHandle = HKEY_LOCAL_MACHINE
Case "HKEY_USERS"
GetMainKeyHandle = HKEY_USERS
Case "HKEY_PERFORMANCE_DATA"
GetMainKeyHandle = HKEY_PERFORMANCE_DATA
Case "HKEY_CURRENT_CONFIG"
GetMainKeyHandle = HKEY_CURRENT_CONFIG
Case "HKEY_DYN_DATA"
GetMainKeyHandle = HKEY_DYN_DATA
End Select
End Function
Function ErrorMsg(lErrorCode As Long) As String
'If an error does accurr, and the user wants error messages displayed, then
'display one of the following error messages
Select Case lErrorCode
Case 1009, 1015
GetErrorMsg = "The Registry Database is corrupt!"
Case 2, 1010
GetErrorMsg = "Bad Key Name"
Case 1011
GetErrorMsg = "Can't Open Key"
Case 4, 1012
GetErrorMsg = "Can't Read Key"
Case 5
GetErrorMsg = "Access to this key is denied"
Case 1013
GetErrorMsg = "Can't Write Key"
Case 8, 14
GetErrorMsg = "Out of memory"
Case 87
GetErrorMsg = "Invalid Parameter"
Case 234
GetErrorMsg = "There is more data than the buffer has been allocated to hold."
Case Else
GetErrorMsg = "Undefined Error Code: " & Str$(lErrorCode)
End Select
End Function
Function GetStringValue(SubKey As String, Entry As String)
Call ParseKey(SubKey, MainKeyHandle)
If MainKeyHandle Then
rtn = RegOpenKeyEx(MainKeyHandle, SubKey, 0, KEY_READ, hKey) 'open the key
If rtn = ERROR_SUCCESS Then 'if the key could be opened then
sBuffer = Space(255) 'make a buffer
lBufferSize = Len(sBuffer)
rtn = RegQueryValueEx(hKey, Entry, 0, REG_SZ, sBuffer, lBufferSize) 'get the value from the registry
If rtn = ERROR_SUCCESS Then 'if the value could be retreived then
rtn = RegCloseKey(hKey) 'close the key
sBuffer = Trim(sBuffer)
GetStringValue = Left(sBuffer, Len(sBuffer) - 1) 'return the value to the user
Else 'otherwise, if the value couldnt be retreived
GetStringValue = "Error" 'return Error to the user
If DisplayErrorMsg = True Then 'if the user wants errors displayed then
MsgBox ErrorMsg(rtn) 'tell the user what was wrong
End If
End If
Else 'otherwise, if the key couldnt be opened
GetStringValue = "Error" 'return Error to the user
If DisplayErrorMsg = True Then 'if the user wants errors displayed then
MsgBox ErrorMsg(rtn) 'tell the user what was wrong
End If
End If
End If
End Function
Private Sub ParseKey(Keyname As String, Keyhandle As Long)
rtn = InStr(Keyname, "\") 'return if "\" is contained in the Keyname
If Left(Keyname, 5) <> "HKEY_" Or Right(Keyname, 1) = "\" Then 'if the is a "\" at the end of the Keyname then
MsgBox "Incorrect Format:" + Chr(10) + Chr(10) + Keyname 'display error to the user
Exit Sub 'exit the procedure
ElseIf rtn = 0 Then 'if the Keyname contains no "\"
Keyhandle = GetMainKeyHandle(Keyname)
Keyname = "" 'leave Keyname blank
Else 'otherwise, Keyname contains "\"
Keyhandle = GetMainKeyHandle(Left(Keyname, rtn - 1)) 'seperate the Keyname
Keyname = Right(Keyname, Len(Keyname) - rtn)
End If
End Sub
Function CreateKey(SubKey As String)
Call ParseKey(SubKey, MainKeyHandle)
If MainKeyHandle Then
rtn = RegCreateKey(MainKeyHandle, SubKey, hKey) 'create the key
If rtn = ERROR_SUCCESS Then 'if the key was created then
rtn = RegCloseKey(hKey) 'close the key
End If
End If
End Function
Function SetStringValue(SubKey As String, Entry As String, Value As String)
Call ParseKey(SubKey, MainKeyHandle)
If MainKeyHandle Then
rtn = RegOpenKeyEx(MainKeyHandle, SubKey, 0, KEY_WRITE, hKey) 'open the key
If rtn = ERROR_SUCCESS Then 'if the key was open successfully then
rtn = RegSetValueEx(hKey, Entry, 0, REG_SZ, ByVal Value, Len(Value)) 'write the value
If Not rtn = ERROR_SUCCESS Then 'if there was an error writting the value
If DisplayErrorMsg = True Then 'if the user wants errors displayed
MsgBox ErrorMsg(rtn) 'display the error
End If
End If
rtn = RegCloseKey(hKey) 'close the key
Else 'if there was an error opening the key
If DisplayErrorMsg = True Then 'if the user wants errors displayed
MsgBox ErrorMsg(rtn) 'display the error
End If
End If
End If
End Function
E na form coloque:
Private DateToday As Date
Private Sub Form_Load()
On errror GoTo errorhandler
'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali this is only an example.
If GetStringValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "XTimes") = "Error" Then
CreateKey "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali"
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "XTimes", "1"
End If
If GetStringValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "XTimes") = "" Then
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "XTimes", "1"
End If
lblTimes.Caption = GetStringValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "XTimes") & " times"
If GetStringValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "LDate") = "Error" Then
CreateKey "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali"
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "LDate", Now + 30
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "LDate1", Now
End If
If GetStringValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "LDate") = "" Then
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "LDate", Now + 30
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "LDate1", Now
End If
lblTrial.Caption = GetStringValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "LDate1")
lblTimes.Caption = GetStringValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "XTimes")
CreateKey "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali"
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "XTimes", lblTimes.Caption + 1
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "Date1", Now
lblStart.Caption = GetStringValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "Date1")
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "Date1", lblStart.Caption
lblExpired.Caption = GetStringValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "LDate")
lblLeft = Format$(days360(lblStart.Caption, lblExpired.Caption), "###,###") & " day(s)"
If Val(lblLeft.Caption) < 0 Then
MsgBox "Your trial version is expired!", vbOKOnly + vbCritical, "Trial Expired"
End
End If
If Val(lblLeft.Caption) > 29 Then
MsgBox "Do not adjust Date/Time. Your trial version is expired!", vbOKOnly + vbCritical, "Trial Expired"
End
Else
ProgressBar1.Value = Val(lblLeft)
End If
Exit Sub
errorhandler:
End Sub
Private Sub Form_Unload(Cancel As Integer)
SetStringValue "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ali", "Date1", lblStart.Caption
End Sub
Private Sub Timer1_Timer()
DateToday = Now
lblToday.Caption = Format$(DateToday)
End Sub
Public Function days360(dt1 As Date, dt2 As Date) As Long
Dim z1 As Long, z2 As Long
Dim d1 As Long, d2 As Long
Dim m1 As Long, m2 As Long
Dim y1 As Long, y2 As Long
d1 = Day(dt1)
m1 = Month(dt1)
y1 = Year(dt1)
d2 = Day(dt2)
m2 = Month(dt2)
y2 = Year(dt2)
If d1 = 31 Then
z1 = 30
Else
z1 = d1
End If
If d2 = 31 And d1 >= 30 Then
z2 = 30
Else
z2 = d2
End If
days360 = (y2 - y1) * 360 + (m2 - m1) * 30 + (z2 - z1)
End Function
Até mais Spectro
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