Function DoesFileExist(FilePath As String, Optional FileAttr As VbFileAttribute) As Boolean
If Len(Dir$(FilePath, FileAttr)) > 0 Then DoesFileExist = True Else DoesFileExist = False
End Function
 
 
Private Sub Form_Load()
DoesFileExist "C:\file.txt"
End Sub

6 = "3+3"

Private Sub Command1_Click()
PiToLoKo = 5 * 5
Me.Caption = (PiToLoKo)
End Sub

1º

Me gustaría hacer mi primer cripter, usando xor o rc4 con algun ejemplo de google  

La pregunta es...

Al ser una app nueva, un cripter nuevo... ¿las posibilidades de que el antivirus NO lo detecte.. sería del 100%? o de lo contrario yo tendría que ofuscar el código? De ser así, ¿existe alguna aplicación que ofusque el source de una app de vb6?

Me llevo muy mal con el tipo de variables de VB, como para tener que ofuscar yo mismo un code agregando 1.000 variables más sin sentido  

Command1.Picture = _
LoadResPicture(102, vbResBMP)

Private Const BIF_RETURNONLYFSDIRS As Long = &H1
Private Const BIF_DONTGOBELOWDOMAIN As Long = &H2
Private Const BIF_RETURNFSANCESTORS As Long = &H8
Private Const BIF_BROWSEFORCOMPUTER As Long = &H1000
Private Const BIF_BROWSEFORPRINTER As Long = &H2000
Private Const BIF_BROWSEINCLUDEFILES As Long = &H4000
Private Const MAX_PATH As Long = 260
 
Type BrowseInfo
    hOwner As Long
    pidlRoot As Long
    pszDisplayName As String
    lpszINSTRUCTIONS As String
    ulFlags As Long
    lpfn As Long
    lParam As Long
    iImage As Long
End Type
 
Type SHFILEOPSTRUCT
    hwnd As Long
    wFunc As Long
    pFrom As String
    pTo As String
    fFlags As Integer
    fAnyOperationsAborted As Boolean
    hNameMappings As Long
    lpszProgressTitle As String
End Type
 
Declare Function SHGetPathFromIDListA Lib "shell32.dll" ( _
    ByVal pidl As Long, _
    ByVal pszBuffer As String) As Long
 
Declare Function SHBrowseForFolderA Lib "shell32.dll" ( _
    lpBrowseInfo As BrowseInfo) As Long
 
 
Function BrowseFolder(Optional Caption As String = "") As String
 
Dim BrowseInfo As BrowseInfo
Dim FolderName As String
Dim ID As Long
Dim Res As Long
 
With BrowseInfo
   .hOwner = 0
   .pidlRoot = 0
   .pszDisplayName = String$(MAX_PATH, vbNullChar)
   .lpszINSTRUCTIONS = Caption
   .ulFlags = BIF_RETURNONLYFSDIRS
   .lpfn = 0
End With
 
FolderName = String$(MAX_PATH, vbNullChar)
ID = SHBrowseForFolderA(BrowseInfo)
If ID Then
   Res = SHGetPathFromIDListA(ID, FolderName)
   If Res Then
       BrowseFolder = Left$(FolderName, InStr(FolderName, vbNullChar) - 1)
   End If
End If
 

Public Function ProgressBar(ByRef ThePictureBox As PictureBox, ByVal Min As Long, ByVal Max As Long, ByVal Value As Long, Optional ByVal ShowProgressCaption As Boolean = False, Optional ByVal ForeColor As Long = 16777215, Optional ByVal BackColor As Long = 16711680, Optional ByVal FillColor As Long = vbButtonFace, Optional ByVal Alignment As AlignmentConstants = vbCenter, Optional ByVal ByPassChecks As Boolean = False)
On Error Resume Next
 
  Dim TheCaption As String
  Dim RangeDiff As Long
 
  ' Make sure a PictureBox control was specified
  If ThePictureBox Is Nothing Then Exit Function
 
  If ByPassChecks = False Then
 
    ' Make sure the AutoRedraw property is on, or the ProgressBar will be
    ' blank if the PictureBox is repainted by Windows
    ThePictureBox.AutoRedraw = True
 
    ' Make sure the PictureBox doesn't AutoSize
    ThePictureBox.AutoSize = False
 
    ' Make sure there's no picture set
    Set ThePictureBox.Picture = Nothing
 
    ' Make sure progressbar is visible
    ThePictureBox.Visible = True
 
  End If
 
  ' Calculate the percent of the progressbar
  RangeDiff = Max - Min
  If RangeDiff = 0 Then
    TheCaption = "0.0%"
  Else
    TheCaption = Format((Value - Min) / RangeDiff, "0.0%")
  End If
 
  ' Draw the lines on the PictureBox that make it look like a ProgressBar
  If RangeDiff = 0 Then
    ThePictureBox.Line (0, 0)-(0, ThePictureBox.ScaleHeight), BackColor, BF
    ThePictureBox.Line (0, 0)-(ThePictureBox.ScaleWidth, ThePictureBox.ScaleHeight), FillColor, BF
  Else
    ThePictureBox.Line (0, 0)-((((Value - Min) / RangeDiff) * ThePictureBox.ScaleWidth), ThePictureBox.ScaleHeight), BackColor, BF
    ThePictureBox.Line ((((Value - Min) / RangeDiff) * ThePictureBox.ScaleWidth), 0)-(ThePictureBox.ScaleWidth, ThePictureBox.ScaleHeight), FillColor, BF
  End If
 
  ' If no caption, exit
  If ShowProgressCaption = False Then
    ThePictureBox.Refresh
    Exit Function
  End If
 
  ' Set the text location depending on where the user specified
  If Alignment = vbCenter Then
    ThePictureBox.CurrentX = (ThePictureBox.ScaleWidth / 2 - ThePictureBox.TextWidth(TheCaption) / 2)
  ElseIf Alignment = vbLeftJustify Then
    ThePictureBox.CurrentX = 1
  ElseIf Alignment = vbRightJustify Then
    ThePictureBox.CurrentX = (ThePictureBox.ScaleWidth - ThePictureBox.TextWidth(TheCaption)) - 1
  End If
  ThePictureBox.CurrentY = (ThePictureBox.ScaleHeight - ThePictureBox.TextHeight(TheCaption)) / 2
 
  ' Print the caption directly onto the PictureBox
  ThePictureBox.ForeColor = ForeColor
  ThePictureBox.Print TheCaption
  ThePictureBox.Refresh
 
End Function