: Printing the Current Directory in VS .NET

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Example: Printing the Current Directory
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Program 2-6 implements a version of the UNIX command pwd The MAX_PATH value is used to size the buffer, but an error test is still included to illustrate GetCurrentDirectory
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Program 2-6 pwd: Printing the Current Directory
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/* 2 pwd -- Print working directory */ #include "EvryThngh" #define DIRNAME_LEN MAX_PATH + 2 int _tmain (int argc, LPTSTR argv []) { TCHAR pwdBuffer [DIRNAME_LEN]; DWORD LenCurDir; LenCurDir = GetCurrentDirectory (DIRNAME_LEN, pwdBuffer); if (LenCurDir == 0) ReportError (_T ("Failure getting pathname"), 1, TRUE); if (LenCurDir > DIRNAME_LEN) ReportError (_T ("Pathname is too long"), 2, FALSE); PrintMsg (GetStdHandle (STD_OUTPUT_HANDLE), pwdBuffer); return 0; }
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Summary
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Windows supports a complete set of functions for processing and managing files and directories, along with character processing functions In addition, you can write portable, generic applications that can be built for either ASCII or Unicode operation The Windows functions resemble their UNIX and C library counterparts in many ways, but the differences are also apparent Appendix B contains a table showing the Windows, UNIX, and C library functions, noting how they correspond and pointing out some of the significant differences
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Looking Ahead
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The next step, in 3, is to discuss direct file access and to learn how to deal with file and directory attributes such as file length and time stamps 3 also shows how to process directories and ends with a discussion of the registry management API, which is similar to the directory management API
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Additional Reading
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NTFS and Windows Storage
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Inside Windows Storage, by Dilip Naik, is a comprehensive discussion of the complete range of Windows storage options including directly attached and network attached storage Recent developments, enhancements, and performance improvements, along with internal implementation details, are all described Inside the Windows NT File System, by Helen Custer, is a short monograph describing the goals and implementation of NTFS This information is helpful in both this chapter and the next
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Unicode
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Developing International Applications for Windows 95 and Windows NT, by Nadine Kano, shows how to use Unicode in practice, with guidelines, international standards, and culture-specific issues The Microsoft home page has several helpful articles on Unicode "Unicode Support in Win32" is the basic paper; a search will turn up others
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UNIX
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Stevens (1992) covers UNIX files and directories in s 3 and 4 and terminal I/O in 11 UNIX in a Nutshell, by Daniel Gilly et al, is a useful quick reference on the UNIX commands
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Exercises
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21 22 Write a short program to test the generic versions of printf and scanf Modify the CatFile function in Program 2-3 so that it uses WriteConsole rather than WriteFile when the standard output handle is associated with a console CreateFile allows you to specify file access characteristics so as to enhance performance FILE_FLAG_SEQUENTIAL_SCAN is an example Use this flag in Program 2-5 and determine whether there is a performance improvement for large files Appendix C shows results on several systems Also try FILE_FLAG_NO_BUFFERING Determine whether there are detectable performance differences between the FAT and NTFS file systems when using atou to convert large files Run Program 2-4 with and without UNICODE defined What is the effect, if any If you have access to a Windows 9x system, determine whether or not the programs function properly on that system Compare the information provided by perror (in the C library) and ReportError for common errors such as opening a nonexistent file Test the ConsolePrompt (Program 2-1) function's suppression of keyboard echo by using it to ask the user to enter and confirm a password Determine what happens when performing console output with a mixture of generic C library and Windows WriteFile or WriteConsole calls What is the explanation Write a program that sorts an array of Unicode strings Determine the difference between the word and string sorts by using lstrcmp and _tcscmp Does lstrlen produce different results from those of _tcslen The remarks under the CompareString function entry in the Microsoft on-line help are useful
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210 Extend the Options function implementation so that it will report an error if the command line option string contains any characters not in the list of permitted options in the function's OptionString parameter 211 Appendix C provides performance data for file copying and atou conversion using different program implementations and on different file systems Investigate performance with the test programs on systems available to you Also, if possible, investigate performance using networked file systems, SANs, and so on to understand the impact of various storage architectures when performing sequential file access
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