multiple instances of program

how to suppress multiple instances of any program by (too) fast a double click ???

Here the sample code :)

Code:

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Option Explicit
'//WIN32API Function
Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As Any, ByVal lpWindowName As String) As Long

'//WIN32API Constant
Private Const SW_RESTORE = 9

Sub Main()
    Dim hwnd As Long
   
    '//Check for Previous Instance
    If App.PrevInstance Then
        hwnd = FindWindow(0&, "App Window Title Here")
        If hwnd <> 0 Then
            SetForegroundWindow hwnd
            ShowWindow hwnd, SW_RESTORE
            End
        End If
    End If
   
    '//Continue load the Main Form
    Load frmMain
    frmMain.Show
End Sub

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Or you can use the PrevInstance property of the App.

Code:

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If App.PrevInstance = True Then Unload Me

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Meg, i think it will be better if make the previous instance become the active window. like what I did in my posted code?

That's not of the matter though. I was only demonstrating a simpler way of achieveing the same thing (checking for the previous instance).