文件列表:

cal.c (1899, 1997-01-26)
datelib.h (13224, 1997-01-26)
demo.c (7934, 1997-01-26)
DEMO.EXE (39158, 1997-01-26)
howto.txt (5570, 1997-01-26)
td.lib (12800, 1997-01-26)

Introduction to the td.lib time/date library: I was recently doing some research on the Civil War and needed to work with dates and times for that period. I needed to be able to quickly and accurately perform time and date calculations, view calendars, make conversions, and print that information to files in a variety of formats. Needless to say, the functions provided by ANSI were completely inadequate. No functions for dates before 1900 were provided, strftime() did not work, which meant not only could I not directly work with these dates and times, they could not even be directly formatted and printed. difftime() did'nt work either. Another problem was with the tm structure itself; the system allocates and deallocates the memory space for the structure and simply overwrites the time/date fields when additional calls are made. Trying to work with multiple instances of the structure caused a number of system crashes. The time field of the tm structure is on a take-it-or-leave-it 24hr clock, the month field is a counter-intuitive 0-11, and the year field is "year-1900" end of story. Simply said, the programmer must work with the unwieldy tm structure and its initialization, make numerous date and time conversions and then concatenate strings for formatting etc. etc. taking too much time away from the programmer. I wanted time and date routines to be easy enough for the beginning progra mmer to quickly learn and use. The programmer should be able to simply declare a predefined time/date type, load its fields with either the current time and date settings, or any other time and date, and then start using it. I did'nt need to calculate moon phases, solar eclipses, cyclic multiphase harmonic patterns, or even dog years. After searching the web for quite awhile, that type of code or libraries was about all I found. The ones that did a fairly good job were too complicated to quickly learn and use and did not comply with the ANSI format specifiers, which is what I am used to, so I decided to roll my own. The result is this small time/date library which will provide all of the basic functionality needed to perform from fast print-the-time-and-date statements to more complicated time/date routines. Functions are provided for practical applications that the programmer is most likely to encounter - not for rarely used moon phases and such. The library uses the cross-over date of Oct. 1582 and calendar convention of January 1 being the beginning of the new year. The calendrical method is proleptic. Detailed discussions of Julian and Gregorian calendars are widely available and so won't be discussed here. The library was compiled using Borland's C++ 4.5 in the small memory model (which means the code you link it to must also be compiled in the small memory model) and is fully ANSI compliant. I use the functions contained in the library on Unix and in a Windows 95 dos box. All that is required is a 386 or higher IBM compatible PC. A small demo is provided to show some easy examples of how you can use the library. (For Unix info see "howto.txt") The library is free and may be used however you wish. However, if this zip file is redistributed it must contain the original unaltered files: readme.txt howto.txt demo.exe demo.c cal.c datelib.h td.lib If you need a different memory model or have questions, or comments, drop me a line at: < bt0202@broncho.ucok.edu > be sure to include your e-mail address for a reply. I will make all source code available for those who request it for a limited time. I am currently working on an "uninstaller" application that will remove EVERY trace of an unwanted program and will rival any of the commercially available software. The MSDOS version will probably be free but any Windows versions will not. (You should be aware that the Windows 95 "Add/Remove Programs" application is only useful when programmers VOLUNTARILY record certain entries into the registry. I have installed dozens of programs that when uninstalled left the registry littered with invalid references to the program!) Brady Tippit 1-26-97 University of Central Oklahoma

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