IsWindow returns false for existing window handle

Question

In a VB6 application I am checking if a certain VB.NET WinForms window exists:

Public Declare Function IsWindow Lib "user32" (ByVal hwnd As Long) As Long

If Not IsWindow(102937) Then
      MessageBox("Window not found!")
End If

The messagebox is shown, but the window DOES exist.

I inspect it by

Debug.Print(Me.Handle.ToInt32)'it prints 102937

What goes wrong here? Am I perhaps handling the return value of "IsWindow" incorrectly?

Thank you.

Answer 1

I found the solution:

I was indeed using the WinAPI function incorrectly.

I should have used

If IsWindow(102937) <> 1 Then