Hi all, I'm having trouble with a prog i've written. It all works fine until another application obscures the directX target area (its on a picture box). When this happens the mouse moves really slowly. I've added a check to stop calling render if the screen is minimized, which works fine, now I just need a check to see if the directX picutrebox is still visible. So far I have the following code in render:

'My rendering operations
        'End the scene
        Me.device.EndScene()
        Try
            Me.device.Present()
        Catch ex As Microsoft.DirectX.Direct3D.DeviceLostException
            RecoverFromLost()
        End Try

and the recoverFromLost function starts with

Dim Code As Int16
        While (True)
            Me.device.CheckCooperativeLevel(Code)
            If Code = Microsoft.DirectX.Direct3D.ResultCode.DeviceNotReset Then
                Exit While
            End If
            System.Threading.Thread.Sleep(1000)
        End While
        'code to reset the device

However this only gets called if ctrl+alt+delete is pressed and always throws the exception

An unhandled exception of type 'System.OverflowException' occurred in 1.exe

Additional information: Arithmetic operation resulted in an overflow.

This points to the CheckCooperativeLevel call. So, does anyone know what calls I need to be making to see if the device should stop rendering (i.e. the draw surface is obscured) and why the checkcooperativeLevel function is overflowing. Many thanks DRB2k2

Hi Jack,
I had a look at the SDK files, but they use the directX helper library. I find this a comlete nightmare to read through. I can understand why MS did it to make the core parts of the samples easier, but it makes the program as a whole a lot more complicated.

Cheers
DRB2k2

oh man its always the simple things,
thanks Jack, now I just need to sort out the partially obscured drawing surface problem.
Cheers
DRB2k2