Norman0406
commented
9 years ago Use the internal network access manager class and check for internet availability before issuing network requests. Also use a timeout timer to handle missing replys and check for error states. Errors should be parsed into an error struct and passed via a signal to whoever is interested in it.
There are different web services that can be used to query more information on amateur radio callsigns.
The QRZ.com API is well documented. I would suggest using this one first. Create an abstract base class for database lookup and structures that contain callsign information. Derive a specific class for the callsign service, i.e. QRZ.com, and fetch information from the returned XML using the newest API version. See here for the XML specification. You have to provide a username and password to obtain a session key, so use HTTPS if possible. I will acquire a paid account soon, so we can retrieve all available information.
There are also offline sources like callsign cd media, etc, that could theoretically be used in the same way.