On Sun, 3 Jun 2007, Johann Glaser wrote:
> Hi! > > I'm going to implement a data logger and a GUI frontend in FreePascal. > One (daemon) program gets data from a device connected via USB and > stores it to a file. A second program, the GUI frontend, connects to the > daemon and can retrieve the measured data and other stuff. Additionally > it can send commands to change the measurement settings. > > All this is quite a typical application for RPC, so I plan to use the > Web Service Toolkit with SOAP. > > Usually the frontend does a remote procedure call to the backend. There > is one important problem I'm facing now. I want the backend (service > provider) to notify the frontend (service consumer) as soon as a new > measurement value has arrived. So this is the reverse direction of > communication. > > Is this possible? Can you please point me to information how to > accomplish this? This is not possible in SOAP, unless you do continuous polling. I believe there are some Microsoft extensions which allow asynchronous notifications, but they are not implemented in SOAP and also not in WST. Michael. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
