PHP

Read Text at a String Offset from a Remote SFTP File

Demonstrates the Chilkat SFtp.ReadFileText64s method, which is like ReadFileText64 but takes the byte offset as a decimal string. The arguments are the handle, the offset string, the maximum number of bytes, and the charset.

Background: The string-offset read exists for the same reason as its write counterpart: it lets code in languages without convenient 64-bit integers still address positions in very large files by supplying the offset as text. Functionally it is identical to the int64 version.

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<?php

use Chilkat2\SFtp;

// Demonstrates the SFtp.ReadFileText64s method, which is like ReadFileText64 but takes the byte
// offset as a decimal string.  The 1st argument is the handle, the 2nd is the offset string, the
// 3rd is the maximum number of bytes, and the 4th is the charset.

$sftp = new SFtp();

// Connect, authenticate, and initialize the SFTP subsystem.
$port = 22;
try {
    $sftp->Connect('sftp.example.com', $port);

    // 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';

    $sftp->AuthenticatePw('mySshLogin', $password);

    $sftp->InitializeSftp();

    $handle = $sftp->OpenFile('subdir/hugefile.dat', 'readOnly', 'openExisting');

    // Supplying the offset as a string is convenient in languages without a native 64-bit integer.
    $offset = '5000000000';
    $numBytes = 6;
    $text = $sftp->ReadFileText64s($handle, $offset, $numBytes, 'utf-8');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $text, "\n";

try {
    $sftp->CloseHandle($handle);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$sftp->Disconnect();