C++

Get an FTP Listing Entry's Last-Modified Time

Demonstrates the Chilkat Ftp2.GetLastModifiedTimeStr method, which returns the last-modified time of a cached directory-listing entry as an RFC 822 date-time string. The only argument is a zero-based index.

Background: The last-modified time is the workhorse timestamp: it updates whenever a file's contents change and is what sync and mirror logic compares to decide whether a file needs re-transferring. It is the most reliably reported of the three across FTP servers, and the RFC 822 string carries a timezone so comparisons are well defined.

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C++

#include <CkFtp2.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the Ftp2.GetLastModifiedTimeStr method, which returns the last-modified time of a
    //  cached directory-listing entry as an RFC 822 date-time string.  The only argument is a
    //  zero-based index.

    CkFtp2 ftp;

    ftp.put_Hostname("ftp.example.com");
    ftp.put_Username("myFtpLogin");

    //  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.
    ftp.put_Password("myPassword");

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

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

    //  GetDirCount retrieves the directory listing on the first call and returns the number of
    //  entries.  A negative return indicates failure.
    int n = ftp.GetDirCount();
    if (n < 0) {
        std::cout << ftp.lastErrorText() << "\r\n";
        return;
    }

    int i;
    for (i = 0; i <= n - 1; i++) {
        const char *name = ftp.getFilename(i);

        //  The value is an RFC 822 string such as "Fri, 21 Nov 1997 09:55:06 -0600".
        const char *lastModified = ftp.getLastModifiedTimeStr(i);
        std::cout << name << "  modified " << lastModified << "\r\n";
    }

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