>>>>>How can I get the same result as

COPY SDF TO Myfile.txt
>>>>>lcStr = Filetostr(Myfile.txt)

w/o writing to file and reading back.
>>>>
>>>>What exactly are you trying to do by getting the entire dbf to a string?
>>>
>>>It's actually cursor. I want to convert it into SDF and append to the end of another file.
>>
>>Then check additive clause of COPY TO command.
>
>Check for what?

Oops, confused this command with SELECT SQL.
So, you can do

SELECT * from YourCursor to FILE yourFile additive

, which would add all records to the end of the file.