Unicode C++

Download an FTP File to a Stream

Demonstrates the Chilkat Ftp2.GetFileToStream method, which downloads a remote file and writes its bytes to a Stream. The first argument is the remote file path and the second is the Stream, which must have a destination sink configured beforehand.

Note: The local paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Streaming to a Stream object decouples the download from where the bytes ultimately go — a file (as here, via SinkFile), or a pipe feeding another component such as a decompressor or a hashing routine — and processes the data as it arrives rather than buffering the whole file. That keeps memory flat for large downloads and lets you chain the transfer into a processing pipeline.

Chilkat Unicode C++ Downloads

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Unicode C++

#include <CkFtp2W.h>
#include <CkStreamW.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the Ftp2.GetFileToStream method, which downloads a remote file and writes its
    //  bytes to a Stream.  The 1st argument is the remote file path and the 2nd is the Stream.

    CkFtp2W ftp;

    ftp.put_Hostname(L"ftp.example.com");
    ftp.put_Username(L"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(L"myPassword");

    success = ftp.Connect();
    if (success == false) {
        wprintf(L"%s\n",ftp.lastErrorText());
        return;
    }

    //  Configure the stream's destination sink before downloading.  Here the stream writes to a
    //  local file.
    CkStreamW fileStream;
    fileStream.put_SinkFile(L"qa_output/report.pdf");

    success = ftp.GetFileToStream(L"public_html/report.pdf",fileStream);
    if (success == false) {
        wprintf(L"%s\n",ftp.lastErrorText());
        return;
    }

    wprintf(L"Downloaded to stream.\n");

    success = ftp.Disconnect();
    if (success == false) {
        wprintf(L"%s\n",ftp.lastErrorText());
        return;
    }
    }