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How to Activate a Window API to Show in VB6

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    • 1). Open your VB6 script in your preferred VB editor.

    • 2). Copy and paste the following code into the declarations code:
      Private Declare Function FindWindow Lib "user32" _
      Alias "FindWindowA" _
      (ByVal lpClassName As String, _
      ByVal lpWindowName As String) As Long

      Private Declare Function GetClassName Lib "user32" _
      Alias "GetClassNameA" _
      (ByVal hWnd As Long, _
      ByVal lpClassName As String, _
      ByVal nMaxCount As Long) As Long

    • 3). Copy and paste the following code into the procedures section:
      Public Sub GetClassNameFromTitle()
      Dim sInput As String
      Dim hWnd As Long
      Dim lpClassName As String
      Dim nMaxCount As Long
      Dim lresult As Long
      ' pad the return buffer for GetClassName
      nMaxCount = 256
      lpClassName = Space(nMaxCount)
      ' Note: must be an exact match
      sInput = InputBox("Enter the exact window title:")
      ' No validation is done as this is a debug window utility
      hWnd = FindWindow(vbNullString, sInput)
      ' Get the class name of the window, again, no validation
      lresult = GetClassName(hWnd, lpClassName, nMaxCount)
      Debug.Print "Window: " & sInput
      Debug.Print "Class name: " & Left$(lpClassName, lresult)
      End Sub

    • 4). Click "GetClassNameFromTitle" in the debug window and click "Run". This should display the class name of the window. This provides the basic structure for the process.

    • 5). Add the following script if you want to include the process in a wrapper:
      Public Function fActivateWindowClass(psClassname As String) As Boolean
      Dim hWnd As Long
      hWnd = FindWindow(psClassname, vbNullString)
      If hWnd > 0 Then
      ' ShowWindow returns True if the window was previously hidden.
      ' I don't care so I use the sub style
      ' ShowWindow and SW_SHOW declared elsewhere
      ' SW_SHOW will display the window in its current size and position
      Call ShowWindow hWnd, SW_SHOW
      fActivateWindowClass = True
      Else
      ' FindWindow failed, return False
      fActivateWindowClass = False
      End If
      End Function

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