Download The Tomes of Delphi : Basic 32-Bit by Alan C. Moore PDF

By Alan C. Moore

Developer's advisor to Delphi Communications is one other addition to the hugely winning Delphi sequence from Wordware. this is often the single identify out there that offers a complete assessment to the communications power of Delphi relative to the foremost communications protocols, resembling TCP/IP, MAPI, SMTP, and HTTP.

About the Author
Alan C. Moore is a professor of song at Kentucky country collage, the place he teaches tune thought and composition. He used to be named exclusive Professor for 2001-2002. Moore has been programming with Borland languages because the Eighties, and is a contributing editor of Delphi Informant journal, for which he writes the File|New column. In 2002, he was once elected director of venture JEDI, a world staff of builders who supply unfastened assets to the Delphi group. he's additionally the writer of The Tomes of Delphi: Win32 Multimedia API.

John C. Penman is a free-lance contractor in Johannesburg, the place he focuses on constructing Winsock, web, and client-server software program. he's co-author of 2 books on Delphi and is a contributor to Delphi Informant Magazine.

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Extra resources for The Tomes of Delphi : Basic 32-Bit

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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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