Thanks for your help at http://www.experts-exchange.com/jsp/qShow.jsp?ta=delphi&qid=20136842
and thanks for your email.
Sorry for the long delay, I have to do many different projects, very hard. :-(
Do you have the MSComm? It comes from VB/VC. Now I using this component in my Delphi program, I want to change to a VCL component, the CommPortDriver seems have many different with the MSComm, It seems don't have the IEOFEnable Input InputLen InputMode NullDiscard Output ParityReplace Rthreshold RTSEnable sthreshold properties. (In my program, I don't used the OnComm event of MSComm, Just use the Input/Output property to receive/send data.)
It's properties picture in here: http://gzddc.51.net/MSComm%20Properties.jpg
How can I change to a VCL communication component smoothly?
Where has a free VCL component duplicate the functionality of the Mscomm32.ocx?
Best Regards, supwang