HWND

[Walt Decker]

On failure HWND(#TAG/#TAG$) should return either zero or some negative number instead of halting, and sometimes crashing an app.  In that way the programmer can take an appropriate action, such as continuing with a different task or exiting exiting the app gracefully.

[Brandon Parker]

Well, you can test for the existence of the handle easily enough. The same can be done for Bitmap handles as well.

Open "Test" For Window As #Main
#Main "TrapClose quit"

Print isHwnd("#Main")
Print isHwnd("#Main2")
Wait

Sub quit handle$
   Close #handle$
   End
End Sub

Function isHwnd(hWnd$)
   On Error GoTo [Error]
       isHwnd = Hwnd(#hWnd$)
       Exit Function
   [Error]
End Function

{:0)

Brandon Parker