Write Text at a 64-bit Offset in a Remote SFTP File

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Demonstrates the Chilkat SFtp.WriteFileText64 method, which encodes text and writes it at a specific 64-bit byte offset in an open handle. The arguments are the handle, the offset, the charset, and the text. The 64-bit offset supports very large files.

Background: A 32-bit offset tops out at about 4 GB, so files larger than that require the 64-bit form to address positions beyond that boundary. The behavior is otherwise identical to the 32-bit version — the only difference is the width of the offset argument, chosen to match the size of the file you are working with.

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bool success = false;

//  Demonstrates the SFtp.WriteFileText64 method, which encodes text and writes it at a specific
//  64-bit byte offset in an open handle.  The 1st argument is the handle, the 2nd is the offset,
//  the 3rd is the charset, and the 4th is the text.  The 64-bit offset supports very large files.

Chilkat.SFtp sftp = new Chilkat.SFtp();

//  Connect, authenticate, and initialize the SFTP subsystem.
int port = 22;
success = sftp.Connect("sftp.example.com",port);
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
string password = "mySshPassword";

success = sftp.AuthenticatePw("mySshLogin",password);
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

success = sftp.InitializeSftp();
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

string handle = sftp.OpenFile("subdir/hugefile.dat","readWrite","openOrCreate");
if (sftp.LastMethodSuccess == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

//  Write at a byte offset beyond the 32-bit (4 GB) range.
long offset = 5000000000;
success = sftp.WriteFileText64(handle,offset,"utf-8","MARKER");
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

success = sftp.CloseHandle(handle);
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

Debug.WriteLine("Wrote at the 64-bit offset.");

sftp.Disconnect();