Write Text at a 32-bit Offset in a Remote SFTP File

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Demonstrates the Chilkat SFtp.WriteFileText32 method, which encodes text and writes it at a specific 32-bit byte offset in an open handle. The arguments are the handle, the offset, the charset, and the text.

bool success = false;

//  Demonstrates the SFtp.WriteFileText32 method, which encodes text and writes it at a specific
//  32-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.

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;
}

//  Open the remote file for read/write so an existing file can be modified in place.
string handle = sftp.OpenFile("subdir/record.dat","readWrite","openOrCreate");
if (sftp.LastMethodSuccess == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

//  Overwrite 5 bytes starting at offset 10.  The offset is a byte position, not a character
//  position, so it must account for the encoded size of any multibyte characters.
int offset = 10;
success = sftp.WriteFileText32(handle,offset,"utf-8","HELLO");
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 specified offset.");

sftp.Disconnect();