title: Problem file binary in read/write with tfilestream
body: <p>Hello I need to work with very big binary files so i can't use functions such as Assign(), Closefile() etc. I want to use TFileStream for its Read()/Write() methods. But I have problem because I can't read back what I've written to the stream. I have understood that the problem was related to the encoding so I think I need to use Unicode and not Ansi. But I haven't understood how to do it. Can someone help me, with examples ? I know how to write/read from/to a file but this doesn't help me solve the problem.</p>