Read Text at a 64-bit Offset from a Remote SFTP File

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Demonstrates the Chilkat SFtp.ReadFileText64 method, which reads up to a number of bytes from a specific 64-bit byte offset of an open handle and decodes them to text. The arguments are the handle, the offset, the maximum number of bytes, and the charset. The 64-bit offset supports very large files.

Background: This is the large-file counterpart to reading at a 32-bit offset: use it whenever the position you need lies beyond the ~4 GB reach of a 32-bit integer, for example seeking into a multi-gigabyte archive or database file. Everything else about the read is the same.

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    success := false

    //  Demonstrates the SFtp.ReadFileText64 method, which reads up to a number of bytes from a
    //  specific 64-bit byte offset of an open handle and decodes them to text.  The 1st argument is
    //  the handle, the 2nd is the offset, the 3rd is the maximum number of bytes, and the 4th is the
    //  charset.  The 64-bit offset supports very large files.

    sftp := chilkat.NewSFtp()

    //  Connect, authenticate, and initialize the SFTP subsystem.
    port := 22
    success = sftp.Connect("sftp.example.com",port)
    if success == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        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.
    password := "mySshPassword"

    success = sftp.AuthenticatePw("mySshLogin",password)
    if success == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    success = sftp.InitializeSftp()
    if success == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    handle := sftp.OpenFile("subdir/hugefile.dat","readOnly","openExisting")
    if sftp.LastMethodSuccess() == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    //  Read 6 bytes starting at a byte offset beyond the 32-bit (4 GB) range.
    offset := 5000000000
    numBytes := 6
    text := sftp.ReadFileText64(*handle,offset,numBytes,"utf-8")
    if sftp.LastMethodSuccess() == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    fmt.Println(*text)

    success = sftp.CloseHandle(*handle)
    if success == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    sftp.Disconnect()

    sftp.DisposeSFtp()