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General Tip - Intermediate

Restart App At Windows Startup
Did you ever want your VB app to automatically start at boot up, only if it was running at shut down and not every time you boot. This will do it.

Option Explicit
' Declare Constants.
Const REG_SZ = 1
Const HKEY_CURRENT_USER = &H80000001
' Declare Registry API calls.
Private Declare Function RegCreateKey Lib "advapi32.dll"
"RegCreateKeyA"  _ 
        (ByVal hKey As Long,
lpSubKey As String, _
         phkResult As Long) As Long
Private Declare Function RegCloseKey Lib "advapi32.dll" _
        (ByVal hKey As Long) As Long
Private Declare Function RegSetValueEx Lib "advapi32.dll"
"RegSetValueExA"  _ 
        (ByVal hKey As Long, _

lpValueName As String, _
Reserved As Long,  _
         ByVal dwType As Long, _
         lpData As Any, ByVal cbData As Long) As Long

Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
    ' The trick is to enter the app in the Run Once key in the Registry
    ' at Unload only if it is being terminated by Windows.
    ' Dimension local variables.

    Dim hKey As Long
    Dim strRunCmd As String
    ' Test to see what is causing the app to terminate. 
    If UnloadMode = vbAppWindows Then
       strRunCmd = App.Path & "\" & App.EXEName & ".EXE"
       ' Create the RunOnce Key in the registry.
       Call RegCreateKey(HKEY_CURRENT_USER, _
            "Software\Microsoft\Windows\CurrentVersion\RunOnce", hKey)
       ' Insert your applications EXE name into the new key.
       Call RegSetValueEx(hKey, "AppName", 0&, REG_SZ, ByVal strRunCmd, _
                          Len(strRunCmd) + 1)
       ' Very important step..... Close the registry.
       Call RegCloseKey(hKey)
    End If
End Sub

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