Stream

[mohfa]

I use MxStorage to store my Files , is there a way to search for a keyword in these stored Files without extract them at all , Then if the result is positive we give the File Name where the Keyword is found.

I thought of using a Stream ( TMemorySteam ).


Thanks in advance

[Phoenix]

I would keep a seperate hashtable with the keywords and the specific filenames. Searching in a well sorted hashtable is a lot faster than running around in a stream, because you would have to scan the whole stream (worst case) to find the keyword - in the (sorted) hashtable you only have to match up the hash value, and you can do that character for character, so when you have the hash abcdef and you start at the beginning and find baaaaa in the list you know that you don't have to look further because there won't be another hash starting with an a later on.

[mohfa]

Thanks Phoenix , could you please provide me with an exemple .

[Phoenix]

Huh, that was more a theoretical point of view ;-)

But I think there are good 'THashTable' implementations somewhere out there you can use.

Have a look here: http://www.vclcomponents.com/catalog/Hash_Table
and here: http://www.benya.com/code/collections/hashtable.html

I think a search for HashTable Delphi or a search here in the DP for Hashtable will bring you good additional information.