Hi gang,

I have a win32 C# app that needs to recursively search for a particular
file type really fast. It always searches the same place for these files.

I'm using Directory.GetDirectories and Directory.GetFiles to do it
currently. Because I know the location is the same every time I build a
cache of all the files and directories. If a directory changes I update
its contents on startup of the app.

Unfortunately when I do a last-date-of-modification check on a directory
it only reports on changes of files that are directly under it. So I
have to check every single directly rather then simply checking the
parent directory.

While I get a significant improvement when none of the directories
change (its much faster to load a file with all the entries in it then
to do a directory search). In particular the first time the app loads
up and has to search every file (around 100,000 and growing) which is
painfully slow (2 or 3 minutes to start up the app).

What techniques/APIs can I use to speed up file searching?

Is there a way to more directly look at the raw data that make up the
file-tables?

cbdeja@my-deja.com wrote:

The purpose of a Critical Section is to control access to variables that
maintain the state of the system; not for waiting for state changes. ...

Thanks for the comment. After a bit of searching, it seems that
Critical Sections are faster if they don't have to block.

But the producer needs to be blocked when the buffer is already full,
and the consumer needs to be blocked when the buffer is empty. This
needs a counting semaphore.

AIUI, a critical section will only block if another thread is
executing its critical section, and there's no support for counting,
so it doesn't seem to be suitable in this case.

Hello,

I created a collection of algorithms which is available under

http://seed7.sourceforge.net/algorith/algorith.htm

If somebody is interested in

- Merge sort
- Computing PI with 1000 decimal digits
- Computing the easter date
- The Lempel Ziv Welch (LZW) compression
- Mersenne prime numbers
- The peasant multiplication

and other algorithms, this is the right place.
If you have some algorithms, I would be glad
to add them (when they are GPL / LGPL).

Greetings Thomas Mertes

Seed7 Homepage: http://seed7.sourceforge.net
Project page: http://sourceforge.net/projects/seed7

Someone asked me a question, I had no answer

Someone wrote a VC++ program, compiled with an illegal copy of Visual
Studio. He wants to sell this application to another party; he asked me
whether the application is illegal. He thought that the application has no
legal issue, it was the machine having the illegal copy of Visual Studio
that has the problem.

I said I don't know. What should be the correct interpretation ?

Thanks.