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Here is what you will need to build and run the examples in this chapter and the rest of the book First, of course, it is helpful to bring your knowledge of applications development; knowledge of C programming is assumed Before you tackle the exercises and examples, however, you will need some basic hardware and software
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A system running Windows A C compiler and development system, such as Microsoft Visual Studio NET or Microsoft Visual C ++ Version 60 Other vendors also supply development systems, and although none have been tested with the examples, several readers have mentioned using other development systems successfully with only minor adjustments Appendix A also mentions using open source tools Note: We will concentrate on developing Windows console applications and will not truly exploit the full powers of Microsoft Visual Studio NET Enough RAM and disk space for program development Nearly any commercially available system will have more than enough memory, disk space, and processing power to run all the example programs as well as the development system, but check the requirements for the development [7] system The rapid pace of improvements in cost and performance is illustrated by recalling that in 1997 the first edition of this book specified, without embarrassment or apology, 16MB of RAM and 256MB of disk space This third edition of the book is being written on a laptop costing less than $1,000, with more than 10 times the RAM (the RAM space exceeds the previously required disk space), 100 times the disk space, and a processor running 50 times as fast as the one used when starting the first edition on a $2,500 PC
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A CD-ROM drive, on either the system or the network, to install the development system The on-line documentation, such as that provided with Microsoft Visual C++ It is recommended that you install this documentation on your disk because you will access it frequently You can also access the information on the Microsoft Web site
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Example: A Simple Sequential File Copy
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The following sections show short example programs implementing a simple sequential file copy program in three different ways: 1 Using the Standard C library 2 Using Windows 3 Using a single Windows convenience function, CopyFile In addition to showing contrasting programming models, these examples show the capabilities and limitations of the C library and Windows Alternative implementations will enhance the program to improve performance and increase flexibility Sequential file processing is the simplest, most common, and most essential capability of any file system, and nearly any large program processes at least some files sequentially Therefore, a simple file processing program is a good way to introduce Windows and its conventions File copying, often with updating, and the merging of sorted files are common forms of sequential processing Compilers and text processing tools are examples of other applications that access files sequentially Although sequential file processing is conceptually simple, efficient processing that attains optimal speed can be much more difficult to achieve It can require overlapped I/O, memory mapping, threads, or other techniques Simple file copying is not very interesting by itself, but comparing programs gives us a quick way to contrast different systems and to introduce Windows The following examples implement a limited version of the UNIX cp command, copying one file to another, where the file names are specified on the command line Error checking is minimal, and existing files are simply overwritten Subsequent Windows implementations of this and other programs will address these and other shortcomings Note: A UNIX implementation is included on the book's Web site
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File Copying with the Standard C Library
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As illustrated in Program 1-1, the Standard C library supports stream FILE I/O objects that are similar to, although not as general as, the Windows HANDLE objects shown in Program 1-2
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