Thanks Stoyan, I followed your advice and I changed the method as follows and the problem seems to have gone away - I have used the control for several hours now without any errors: 1. I changed the declaration of the callback to accept a HandleRef in place of the hDC handle, 2. I moved the delegate type variable to the method where it is used rather than holding onto a class-level variable, 3. I changed the method which calls the callback as follows:
Private Overloads Sub GetAvailableFontInfo(ByVal FontName As String) Etc... Dim pHDCHandleRef As HandleRef Dim pGCHandle As GCHandle = GCHandle.Alloc(Me) Try Etc... phDC = pGraphics.GetHdc pHDCHandleRef = New HandleRef(pGraphics, phDC) Etc... pResult = EnumFontFamiliesEx(pHDCHandleRef, pLogFont, AddressOf Me.EnumFontInfoCallback, IntPtr.Zero, 0) Etc... Finally pGCHandle.Free() Etc... End Try End Sub Thanks for your help, Regards John Whattam. =================================== This list is hosted by DevelopMentor® http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com
