I've got a c# WinForms application built on Jan's generic HID host app (v4.6). Everything was working as expected until recently when decided to add a background thread (via the BackgroundWorker control) and move parts of the code there to keep my UI responsive. Now, when my user clicks a button on the form, I start the background thread which, among other things, calls the FindTheHid() method in Jan's original example. Inside FindTheHid() is this line:
// MyDeviceManagement.RegisterForDeviceNotifications() will in turn call RegisterForDeviceNotification() and pass in the 2nd, 3rd and 4th args
success = MyDeviceManagement.RegisterForDeviceNotifications( myDevicePathName, FrmMy.Handle, hidGuid, ref deviceNotificationHandle );
As you can see, the second argument to RegisterForDeviceNotifications() is a handle to the window that will receive events for the device specified in the third argument. Since this is now being called from a background thread instead of the main UI thread, I'm getting a System.InvalidOperationException ("Cross-thread operation not valid: Control 'FormMain' accessed from a thread other than the thread it was created on."). Is it possible to execute this from a background thread?
