Read data RS232 without pooling
i read data from RS232 in a for loop.this has no good performance.i want don't have a for loop instead of that there was a thing like event that when data is receiving it fire. is this possible? for example when data is receiving from COM16 event firing.
You give absolutely no info what API you are currently using to read from COM port.
Anyway, if that API has a blocking call, that will not return before new data is available, you can simply use that one, in a loop, and put that loop into a background thread. Then send a signal as soon as new data is available.
thanks for your reply. how can i have blocking call for that? i can't implement
Tell us what API you are using to read from the COM port, if you expect an answer on this ;-)
I'm using QExtSerialPort very successfully in an application that doesn't poll, either.
It makes this possible by emitting a readyRead signal, as soon as data is available.
You can also use official "QtSerialPort":http://qt-project.org/wiki/QtSerialPort addon.
See documentation about API and examples "here":http://doc-snapshot.qt-project.org/qt5-stable/qtserialport/qtserialport-index.html.
Therefore there is no need of use of your custom code.