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- The zip file :NTX.ZIP should contain the following files:
- NTXCAT.PRG - source for NTXCAT.EXE
- NTXFUNC.PRG - source for user-defined function FNTXCAT
- NTXCAT.EXE - executable version of index catalogue program
- LISTNTX.PRG - source for LISTNTX.EXE
- LISTNTX.EXE - executable version of index catalogue listing program
- UDFS.PRG - source for 2(two) user-defined functions I use in these programs
- NTX.LST - sample output file from LISTNTX
- READ.ME - this file
-
- This program was designed to aid the system developer & administrator
- of Clipper based systems. The problem is that when you have multiple index
- files for each database in your system, it is hard to tell what database the
- index is associated with. Neither Clipper or Dbase includes the database name
- used in the actual index file.
-
- After examining the problem, I came up with the following solution. The
- first 1024 bytes in all .ntx files is used to store the index expression as
- well as some proprietary information unknown to myself. The actual index
- information does not start until byte 1025. After careful testing, I
- determined that the 16 bytes prior to 1025,1008 thru 1024, were a safe place
- to store some additional information. What NTXCAT actually does is replace bytes
- 1008 thru 1015 with a database file name.
-
- The program starts by reading a directory of all .ntx files in the current
- directory. It then presents each file name, one at a time, and prompts for a
- database name to be inserted into that .ntx file. This works just fine for an
- initial start of the cataloging process. However, whenever you index or re-index
- this information is lost, since Clipper rewrites the index file on top of the
- old one.
-
- This is where the user-defined function FNTXCAT comes in. The idea is that
- everywhere in your program where you do an index or re-index you should then
- call this function which will insert the database name in the index file.
-
- Now, you may wonder, that I have a database file name in the index file
- what I am going to do with it? Well, thats where LISTNTX.EXE comes in. Basically
- that program will read all .ntx files in the current directory and create a text
- file showing:index file name, index expression, & database name inserted by
- NTXCAT. You are prompted for the file name on program execution. This text file
- may then be viewed or printed out at your discretion.
-
- This is one of my first attempts at writing a major utility for Clipper
- systems and therefore do not imply any expertise on the subject. Even though I
- have tested this program thouroughly, I cannot guarentee any results. However,
- I would appreciate any feedback, good or bad, on this idea. I can be reached by
- electonic mail at any of the following places:
-
- Contech BBS - (301)340-2212
- Programmers Corner - (301)995-3744
- Cbug BBS - (301)730-5624
- Compuserve - 73257,1737
-
- Good Luck & Happy Clippering!
-
- Gary Blatt
-