Question

I have a instream that takes in raw binary data from Bluetooth on Android 2.2 phone. The data coming in goes into a buffer 1024 in size. I read() the data and then take that and write to a file. I send that file via FTP to my computer. I noticed a disturbing pattern when ftp’ing that an extra character gets inserted every once in a while. So I printed out the buffer first to LogCat and noticed the character was not there. Here is my read write code.

FTPClient con = new FTPClient();
File file = new File(Environment.getExternalStorageDirectory() + "/ftp/new/" + "testdata.bin");

try {
    con.connect("someIPAddress");
    if (con.login("anonymous", "[e-mail]")) {
        con.enterLocalPassiveMode(); // important!

        FileInputStream in = new FileInputStream(file);
        boolean result = con.storeFile("testdata.bin", in);
        in.close();
        if (result) {
            Log.v("upload result", "succeeded");
        }
    }
} catch (Exception e) {e.printStackTrace();}

Here is an example of the output from the logcat:

09 15 D0 0D 17 0A 06 08 07

and here is what is in the file after ftp’ing:

09 15 D0 0D 17 0D 0A 06 08 07

Well I thought that hmm 0A something is injecting 0D to make (CRLF) but it doesn’t happen at every 0A. I can write the same program in C# and this doesn’t happen at all. So any ideas or help?

On further investigation I found it occurs when the data going in is 17 0A and the file shows 17 0D 0A.

Answer 1

Solution: The FTPClient will send the file by default as ASCII. Set the fileType to Binary file by using this command:

con.setFileType(FTP.BINARY_FILE_TYPE);