Download OOP Demystified by James Keogh, Mario Giannini PDF

By James Keogh, Mario Giannini

Research object-oriented programming very quickly with aid from this easy-to-understand consultant, excellent for beginner and professional programmers alike. detect why items are such a success because the version for this kind of programming and the way items are categorised. Distinguish among how humans see the realm and the way pcs “see” it. find out about attributes and strategies, inheritance, polymorphism, real-world and case modeling, object-oriented programming languages, and masses extra. each one bankruptcy ends with a quiz, culminating in a last examination on the finish of the publication so that you can try your wisdom.

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Sometimes, though, an application may call WSAStartup() more than once. The golden rule is to make certain that the number of calls to WSAStartup() matches the number of calls to WSACleanup(). For example, if an application calls WSAStartup() three times, it must call WSACleanup() three times. That is, the first two calls to WSACleanup() do nothing except decrement an internal counter in Winsock; the final call to WSACleanup() for the task frees any resources. 1 (which only supports one provider), the architecture of Winsock 2 supports multiple providers, which we will discuss in Chapter 4.

That is, network byte order is big endian for use on the TCP/IP network. You mustn’t forget that network addresses, datagram length, and TCP/IP window sizes must also be in network byte order (big endian). Figure 3-1 on the following page shows how little endian and big endian numbers are stored in memory. 1 Resolution n 31 Figure 3-1 host: 100d è 00000064h network: 64000000h = 1677721600d The following functions are used to convert from host byte order to network byte order, or network byte order to host byte order.

28 n Chapter 2 Summary We have learned how to load and unload Winsock. We also learned how to detect Winsock and handle errors. In the next chapter, we’ll learn how to use the various functions for resolving hosts and services. Resolution of hosts, ports, and services is an essential step to perform before communication can occur between peer applications. 1. The use of these new functions, though, comes at a price in terms of increased complexity. As with most other Microsoft APIs, the original functions are still valid and simpler to understand.

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