Question: When I try to send parameter with Russian letters to a report then passed as an empty string. Note - Russian letters recoded function Utf8Encode.

Answer:

FR Server prior to version 2.2 supports only the transfer of Russian letters are encoded in Unicode. Starting with 2.2 supports Unicode encoding and system default encoding (windows-1251). If you have a server version below 2.2, then the reason of the problem is wrong encoding.