public DataSourceManager(Identity applicationId, IWindowsMessageHook messageHook)
{
// Make a copy of the identity in case it gets modified
ApplicationId = applicationId.Clone();
ScanningComplete += delegate { };
TransferImage += delegate { };
_messageHook = messageHook;
_messageHook.FilterMessageCallback = FilterMessage;
IntPtr windowHandle = _messageHook.WindowHandle;
_eventMessage.EventPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(WindowsMessage)));
// Initialise the data source manager
TwainResult result = Twain32Native.DsmParent(
ApplicationId,
IntPtr.Zero,
DataGroup.Control,
DataArgumentType.Parent,
Message.OpenDSM,
ref windowHandle);
if (result == TwainResult.Success)
{
//according to the 2.0 spec (2-10) if (applicationId.SupportedGroups
// | DataGroup.Dsm2) > 0 then we should call DM_Entry(id, 0, DG_Control, DAT_Entrypoint, MSG_Get, wh)
//right here
DataSource = DataSource.GetDefault(ApplicationId, _messageHook);
}
else
{
throw new TwainException("Error initialising DSM: " + result, result);
}
}
public void SelectSource(DataSource dataSource)
{
DataSource.Dispose();
DataSource = dataSource;
}
