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Another common failure in client-server applications is receiving unexpected information. This can be in the form of a malformed command or a command parameter that is outside of the expected boundaries. In either case, it is very important to validate the command as it is being read from the network. Once again, different strategies are employed depending on whether you are using a plain-text or binary protocol. We will look at each in turn. For a plain-text protocol, you will typically employ some kind of grammar that specifies a valid command. So, the first step in validating the command is to verify that it is grammatically correct. This can be done either by creating a handmade parser or by using parser-generator tools such as lex and yacc. Then, each parameter should be checked to make sure that it falls within an accepted range. As soon as an irregularity is detected, an error message should be returned, the remainder of the command ignored, and perhaps even the connection terminated. Otherwise, you run the risk of the application failing in an unexpected manner. When you use a binary protocol, even more care must be taken. This is because you are generally storing the incoming data directly into structs or class variables, and an inadvertent buffer overflow can occur. The grammar in a binary protocol is implicit, but values should be checked for validity as they are received. If a problem is detected, then an error message should be returned immediately and the remainder of the command discarded. Again, perhaps the connection should even be closed. asp.net code 128 reader C# Code 128 Reader SDK to read, scan Code 128 in C#.NET class ...
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