Unicode C

FTP Socket Buffer and Address Options

Demonstrates the SoRcvBuf, SoSndBuf, PreferIpv6, and ClientIpAddress properties.

Background: These are low-level knobs for specific situations. Larger send/receive buffers can improve throughput on high-bandwidth, high-latency links, though the defaults suit the common case. PreferIpv6 only matters when a hostname resolves to both address families, choosing which to try first. ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing connection to a particular local interface. Change any of these only with a concrete reason.

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Unicode C

#include <C_CkFtp2W.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkFtp2W ftp;

    success = FALSE;

    ftp = CkFtp2W_Create();

    CkFtp2W_putHostname(ftp,L"ftp.example.com");
    CkFtp2W_putUsername(ftp,L"myFtpLogin");

    //  SoRcvBuf and SoSndBuf set the TCP socket receive/send buffer sizes.  The defaults are tuned for
    //  the common case; larger values can sometimes help throughput on high-latency links.
    CkFtp2W_putSoRcvBuf(ftp,4194304);
    CkFtp2W_putSoSndBuf(ftp,524288);

    //  PreferIpv6 (default FALSE) chooses IPv6 over IPv4 when a hostname resolves to both.
    CkFtp2W_putPreferIpv6(ftp,FALSE);

    //  ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing
    //  connection to a specific local interface.
    CkFtp2W_putClientIpAddress(ftp,L"192.168.1.50");

    //  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.
    CkFtp2W_putPassword(ftp,L"myPassword");

    success = CkFtp2W_Connect(ftp);
    if (success == FALSE) {
        wprintf(L"%s\n",CkFtp2W_lastErrorText(ftp));
        CkFtp2W_Dispose(ftp);
        return;
    }

    wprintf(L"Connected with custom socket options.\n");

    success = CkFtp2W_Disconnect(ftp);
    if (success == FALSE) {
        wprintf(L"%s\n",CkFtp2W_lastErrorText(ftp));
        CkFtp2W_Dispose(ftp);
        return;
    }



    CkFtp2W_Dispose(ftp);

    }