Whether you are maintaining a legacy POS system or just curious about 90s programming paradigms, these four projects—The System Watcher, Hex Editor, Password Vault, and Port Scanner—will give you an edge.
A simple port scanner is common, but a responsive one in VB6 is rare because VB6 is single-threaded. This exclusive project uses a controls to scan 20 ports simultaneously without freezing the UI. Core Logic: 'Assume Winsock1 is a control array with Index 0 to 19 Private Sub ScanPort(ByVal IP As String, ByVal StartPort As Integer, ByVal EndPort As Integer) Dim i As Integer Dim CurrentPort As Integer CurrentPort = StartPort For i = 0 To 19 If CurrentPort <= EndPort Then Winsock1(i).RemoteHost = IP Winsock1(i).RemotePort = CurrentPort Winsock1(i).Connect lblStatus.Caption = "Scanning Port: " & CurrentPort CurrentPort = CurrentPort + 1 End If DoEvents 'Keep UI alive Next i End Sub visual basic 60 projects with source code exclusive
'Save to file Private Sub SaveVault() Dim ff As Integer ff = FreeFile Open App.Path & "\vault.dat" For Binary As #ff Put #ff, , EncryptString(Text1.Text, MasterPass) Close #ff End Sub Whether you are maintaining a legacy POS system
Most "Hex Editors" for VB6 crash on files larger than 64KB because they load the whole file into a TextBox. This exclusive version includes a RichTextBox with virtual scrolling logic (not fully shown for brevity, but available in the full download). You learn how to use Seek and Get to page data. Project #3: Offline Password Vault (3DES Encryption) Difficulty: Intermediate Exclusive Concept: Real cryptography using CAPICOM (Microsoft Crypto API). Core Logic: 'Assume Winsock1 is a control array
The best way to learn is to take the source code, break it, and fix it. Change the Hex Editor to an EXE patcher. Turn the Port Scanner into a Network Monitor. The source code is your oyster.
' --- Call this in a Command Button --- Private Sub cmdOpen_Click() CommonDialog1.ShowOpen Text1.Text = LoadFileToHex(CommonDialog1.FileName) End Sub