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Compare StringLists

Posted on 1998-05-28
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Last Modified: 2012-05-04
I am looking for a clever solution to compare the content of a StringList 1 with the content
of a StringList b. The content of StringList a is a "snapshot" of a directory a few days ago
(i.e the name of the files in this directory) and the content of StringList b are the the actual
filenames found in the same directory. Maybe there are some more files today than bevor
or somes are deleted.

Any hint is welcome!

Thanks a lot.
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Question by:rjufer
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2 Comments
 
LVL 7

Accepted Solution

by:
BlackMan earned 200 total points
ID: 1348479
I think the best solution is to sort both lists. Then you can walk thru the lists in the following manner: (I call them A and B)

If A[index] < B[Index] Then A has items, that are not present in B. Increase Index until A[Index] >= B[Index]

Likewise, if B[index] < A[Index] Then B has items, that are not present in A. Increase Index until B[Index] >= A[Index]

When Index exceeds the number of items in either list A or B, the remaining items in the other list are new entries.
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Author Comment

by:rjufer
ID: 1348480
Hi

Thanks very mutch for your hint, just great .....!!!!

Rolf
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