Hello again, and thanks for your answer: Well I tried what you suggested (I guess) but got no luck. I know that I am able to send the data but can't receive anything... seems that readAll or read....() don't work at all
I've drop some lines on pastebin http://pastebin.com/mpYC0pPt with an tiny application where the problem is shown I hope someone can put some light on this... Thank you very much 2013/7/22 Phil Thompson <p...@riverbankcomputing.com> > On Mon, 22 Jul 2013 16:31:55 +0200, Jorge Tornero - Listas > <jtorlis...@gmail.com> wrote: > > Hello everybody, > > > > I'm trying to share a digital scale through the network, making it able > > to receive tare/send weight commands. > > The scale is connected to a remote computer (a raspberry pi, by the way) > > > with a serial converter an the raspi is executing remserial, thus makin > > avalilable the serial port to the network through port 23000. > > > > Because I am making my application with PyQt4, I have chosen to use > > QTcpSocket to do the communications between the computers. It is pretty > > easy and I am able to get what i want (sending command and receiving > > weights) just by: > > > > soc=QtNetwork.QTcpSocket() > > > > > > soc.connectToHost('174.33.22.11',23000) > > > > soc.writeData('01ST@') > > print soc.readAll() > > soc.disconnectFromHost() > > > > > > And of course I get the weight and I am able to repeat the cycle > > connect-poll-receive-disonnect > > > > The problem is whe I put that into a function like: > > > > def captura(): > > > > soc=QtNetwork.QTcpSocket(app) > > comandoCaptura=chr(6)+'01S@'+chr(13) > > soc.connectToHost('172.23.2.25',23000) > > soc.writeData(comandoCaptura) > > a=soc.readAll() > > print a > > soc.disconnectFromHost() > > return a > > > > > > Ther is no wai to make it works. I guess is a basic python issue, but > > can anyone help? > > QTcpSocket is asynchronous, so you need an event loop. After calling > connectToHost() you shouldn't try to read or write until the connected() > signal has been emitted. > > Phil >
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