December 1998
Intermediate to advanced
482 pages
12h 14m
English
Content preview from Palm Programming: The Developer's GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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TCP/IP
In this section, we show you how to use TCP/IP on a Palm device. To accomplish this, we discuss the API for networking on a Palm device, we give you some programming tips for implementing TCP/IP, and last we create a small sample application that sends email to a Simple Mail Transfer Protocol (SMTP) server.
Network API
The Palm SDK (Version 2.0 or later) contains a net library that provides network services, like TCP/IP, to applications. With this library, an application on the Palm device can connect to any other machine on a network using standard TCP/IP protocols. The API for this library is a socket interface, modeled very closely on the Berkeley Sockets API.
Note
Sockets are a communication mechanism. Information is sent into a socket on one machine and comes out of a socket on a remote machine (and vice versa). With a connection-oriented socket interface, you can establish the connection between the two machines prior to sending data. The connection stay opens whether or not data is sent. A good example of this is TCP. Sockets also allow a connectionless mode for sending datagrams. These can be sent to an address without any prior connection using a protocol like User Datagram Protocol (UDP).
For a brief introduction to Berkeley Sockets and socket programming, see http://www.ibrado.com/sock-faq/. For a more detailed discussion, see Unix Network Programming, by W. Richard Stevens (Prentice Hall; ISBN: 0-13-949876-1).
The similarity between the Berkeley Sockets API and the ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.