Good idea but code doesn't preserve CRLF. I modified part of your code

nSize = FSEEK(lnHandle, 0, 2)
=FSEEK(lnHandle, 0, 0)
lcData = Fread(lnHandle, nSize)

I'l try code in real life. Thanks for reply.

>Hi Zoran.
>
>You could read and write the file using the low level file functions something like this -
>

>lnHandle = fopen("YourFile", 2)
>lcData = ""
>do while !feof(M.lnHandle)
>	lcData = lcData + Fread(M.lnHandle)
>EndDo
>
>* Put your current code that proccesses the string here
>
>Fchsize(M.lnHandle, 0)
>Fseek(M.lnHandle, 0)
>Fwrite(M.lnHandle, M.lcData)
>Fclose(M.lnHandle)
>

>That would be the same as using FileToStr and StrToFile, except that it doesn't release the file handle until it's done so you shouldn't have the problem your seeing.
>
>Ian Simcock.
>
>>Sorry for a lack of information. Yes, I need to write it back in the same file. File is a small, couple of kb.
>>There is a procedure: I receive a file from a service (cyrilyc and latinic letters) which I should transform all to latinic. Some of lines in a file is longest than 254bytes. After transformation I search for a specific strings, remember variables and write it down to database. After that I delete file.
>>
>>
>>If you give a better description of what you really want to achieve, we can help you better.
>>
>>You don't only want to search a file, you also want to write it back, which is new information. And when you write it back, is it to the same file name, or a new?
>>
>>Also, please tell us roughly how big the files are.
>>
>>The more information you give, the better.
>>
>>>On slow computers when I issue FILETOSTR(), then some proccesing and then STRTOFILE() back, sometimes error file access denied occurs. I don't want to slow down program while proccesing because of few users :-(. So, I'm looking for a possible different solution.
>>>
>>>May I ask what's wrong with using FileToStr()?
>>>
>>>>Line lenght can be more than 254 bytes and before the time of proccesing I don't know lenght of a specific line.
>>>>
>>>>You can use FGET to read text file line by line and compare
>>>>
>>>>>Any ideas how to find string between two unique strings in TXT file without using FILETOSTR command?
>>>>>For example I need to find string
>>>>>
>>>>>aa
>>>>>bb
>>>>>cc
>>>>>
>>>>>in TXT file
>>>>>
>>>>>1111
>>>>>2222
>>>>>3333
>>>>>first string:aa
>>>>>bb
>>>>>cc
>>>>>second string:fsdfsdfs
>>>>>444
>>>>>555