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Livingston: Because the desktop publishing idea was brand new Geschke: Yes. Up until then, people used basically analog, labor-intensive technologies. It turns out my grandfather and father were both letterpress photo engravers, and so I knew what it was like to work with the etching baths and the copper plates and all of the emulsions and everything. It was very toxic work, very expensive and very labor intensive. What we were beginning to demonstrate pretty early on was that you could do as good, if not better, quality using a computer and PostScript than you could with the old analog technologies. Desktop publishing became very popular. For an investment of a few thousand dollars you could, in effect, be your own printer and publisher. So it opened up a whole lot of new businesses. As graphic artists and designers began to learn how to use a computer, we brought out products like Adobe Illustrator. All of a sudden, the whole industry began to move, and within less than a decade the entire printing and publishing industry went from the old analog world completely over to the digital world. That was a tremendous thing to see, and of course it was a huge benefit to us. Livingston: When you first started, you planned to build the computer, the

daytimeSocket.Connect(serverIp, 13);

Remember, port 13 is the port number allocated by IANA for the daytime service. We re going to retrieve the time of day as text from this service, so we declare a variable to hold the result:

printer, and the programming language that would make everything talk. Did you have a name for it before it was called PostScript

string data;

Note Web sites typically use port 443 for SSL. However, when you are using SSL with other protocols

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Sockets represent all data as bytes. (Or more precisely, octets, which are 8-bit bytes. Back in the old days, some computers used other byte sizes, and you occasionally come across evidence of this for example, some parts of the Internet email system guarantee to transfer 8-bit bytes, and may truncate your data to seven bits per byte.) The Daytime Protocol specification says that the service will return text using the ASCII encoding, so we need something that can convert a stream of bytes containing ASCII into a .NET string. Example 13-23 does this.

Geschke: No, PostScript was the name that we picked shortly after we started our business. Livingston: Did you use the same ideas that were in Interpress Geschke: There were several things that weren t done in Interpress. It wasn t

using (Stream timeServiceStream = new NetworkStream(daytimeSocket, true)) using (StreamReader timeServiceReader = new StreamReader(timeServiceStream, Encoding.ASCII)) { data = timeServiceReader.ReadToEnd(); }

A few things are going on here. First, we constructed a NetworkStream this class derives from Stream, and it s how .NET lets us treat a socket-based connection in the same way as any other Stream. In general, the use of streams is optional because the Socket class provides methods that let you read and write data directly. But in this example, getting an actual Stream object is useful because we can plug it into a StreamReader. Stream Reader takes a stream that contains text and can convert the bytes in that stream into string objects. Example 13-23 uses the StreamReader class s ReadToEnd method this asks to read all of the data in the stream to the very end and to return it as a single string.

really a programming language the way PostScript was; it was a little more static. And in the design of Interpress, we never were able to figure out how to deal with type. In the world before Adobe, the presumption was that to get high-quality type at laser printer resolutions, let alone ink jet resolutions, you would have to hand-tune bitmaps for every type style and every point size. Extremely labor intensive. Also, what would look good on a laser printer wouldn t necessarily look good on an ink jet printer and probably not look at all good on a computer screen. So in fact you not only had to design for different

Beware of a classic rookie mistake with TCP sockets. Developers often observe that if they write, say, 20 bytes into a socket, and then on the receiving end they perform a read operation that asks for more bytes (e.g., 1,000), that read usually returns 20 bytes rather than waiting for the requested number of bytes to arrive. Many people mistakenly assume this means TCP guarantees that data will arrive in chunks of the same size in which it was sent. In practice, if a client sends a 20-byte chunk of data, the receiving end may well return six bytes of that chunk from the first read, then another 13 in the next, and then the last byte in the next read. Or even better, it might decide to aggregate that final byte onto the front of the next lump of data sent by the client. TCP sockets only attempt to deliver all the bytes in the order in which they were originally sent. Your code cannot make any assumptions about the granularity in which the socket will return incoming data. TCP has no idea of a message or a frame it offers just a linear sequence of bytes. Your code needs to be ready to cope with data coming out of the socket in arbitrarily sized lumps. (Asking the socket for data one byte at a time is a way of simplifying this, although for high-bandwidth communications that might not be the most efficient solution you may get better throughput if you let the socket give you data in slightly larger chunks.)

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