Webbrowser cross-thread operations

Webbrowser must be single-threaded. If I call invoke in another thread, this invoke will return an error. The compromise is to implement cross-thread control in disguise by sending a message (sendmessage.

However, there is a problem that must be solved. Because of the Cross-thread, the Count problem must be considered. for the idispatch pointer of the invoke object, the Count must be increased. At the same time, the Count must be increased for the idispatch object in dispparams. otherwise, it is possible that the object has been destroyed by webbrowser (jscript. dll Control JS), make ProgramCrash.