I use PORT.DLL for writing or reading some data to or from COM port from my VFP app. It works fine, but now I have to do some changes with reading.

Well, reading COM port was a procedure user starts with click on button, the program opens com port, reads some bytes in a loop until some condition stops the procedure - like stopbyte comes or just a timeout. Now I have to do a program that should be able to read com port continuously all the time and react diferently on received bytes. It sounds to be like a windows service running in a background, but that's not the point.

So - when I make my program to read com port in a loop, it works, but the CPU usage jumps to 100% and there is a constant hourglass on, so it's not what I want. I looked some communication software like HyperTerminal, and it worked more calm, so it's possible, but how?

Is there any idea how to push the com port reading in a background of my VFP app?

Thank's, Zlatko.