Losing NATIONAL CHARACTERS(blob- clob- table). unistr?

Hello!
I have a problem with national characters. My example is as follows:
1. A csv file is uploaded from disk to htmldb_application_files
2. This BLOB is then converted to CLOB with dbms_lob.converttoclob()
3. Data from this CLOB is copied to PL/SQL array.
4. From PL/SQL array to table in database.
The problem: Either data copied to table in database loses national characters (display strange characters instead of national), or if I set my national character set id as an argument of dbms_lob.converttoclob() function I have an error - says that file is inconvertible.
What is wrong? How can I solve my problem? Can unistr() help somewhere? Any ideas?
Tom

Duplicate posting, being addressed at:
losing NATIONAL CHARACTERS(blob->clob->table). unistr?

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Hello Gurus,
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Edited by: user576087 on Mar 18, 2012 11:54 PM

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Losing NATIONAL CHARACTERS(blob- clob- table). unistr?

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