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.

#include <CkSFtp.h>

void ChilkatSample(void)
    {
    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.

    CkSFtp sftp;

    //  Connect, authenticate, and initialize the SFTP subsystem.
    int port = 22;
    success = sftp.Connect("sftp.example.com",port);
    if (success == false) {
        std::cout << sftp.lastErrorText() << "\r\n";
        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.
    const char *password = "mySshPassword";

    success = sftp.AuthenticatePw("mySshLogin",password);
    if (success == false) {
        std::cout << sftp.lastErrorText() << "\r\n";
        return;
    }

    success = sftp.InitializeSftp();
    if (success == false) {
        std::cout << sftp.lastErrorText() << "\r\n";
        return;
    }

    //  Open the remote file for read/write so an existing file can be modified in place.
    const char *handle = sftp.openFile("subdir/record.dat","readWrite","openOrCreate");
    if (sftp.get_LastMethodSuccess() == false) {
        std::cout << sftp.lastErrorText() << "\r\n";
        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) {
        std::cout << sftp.lastErrorText() << "\r\n";
        return;
    }

    success = sftp.CloseHandle(handle);
    if (success == false) {
        std::cout << sftp.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Wrote at the specified offset." << "\r\n";

    sftp.Disconnect();
    }