C++

Write Bytes to a Remote SFTP File (BinData)

Demonstrates the Chilkat SFtp.WriteFileBd method, which appends all bytes in a BinData to the remote file identified by an open handle. The first argument is the handle and the second is the BinData.

Note: This example uses a relative local path, which is resolved against the application's current working directory. Absolute local paths may also be used. Supply the path appropriate to your own environment.

Background: This is the binary counterpart to WriteFileText — the right choice for images, archives, or any non-text content, where a charset conversion would corrupt the data. Combined with an appropriate OpenFile disposition it can create, overwrite, or append; here the file is created/truncated first so the result is exactly the BinData contents.

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C++

#include <CkSFtp.h>
#include <CkBinData.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the SFtp.WriteFileBd method, which appends all bytes in a BinData to the remote
    //  file identified by an open handle.  The 1st argument is the handle and the 2nd is the BinData.

    CkSFtp sftp;

    //  Connect, authenticate, and initialize the SFTP subsystem.
    int port = 22;
    success = sftp.Connect("sftp.example.com",port);
    if (success == false) {
        std::cout << sftp.lastErrorText() << "\r\n";
        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.
    const char *password = "mySshPassword";

    success = sftp.AuthenticatePw("mySshLogin",password);
    if (success == false) {
        std::cout << sftp.lastErrorText() << "\r\n";
        return;
    }

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

    //  Open (creating/truncating) the remote file for writing.
    const char *handle = sftp.openFile("subdir/image.png","writeOnly","createTruncate");
    if (sftp.get_LastMethodSuccess() == false) {
        std::cout << sftp.lastErrorText() << "\r\n";
        return;
    }

    //  Put the bytes to write into a BinData.  (Here they are loaded from a local file, but the
    //  bytes could come from anywhere.)
    CkBinData bd;
    success = bd.LoadFile("qa_data/image.png");
    if (success == false) {
        std::cout << bd.lastErrorText() << "\r\n";
        return;
    }

    //  Append the BinData bytes to the open remote file.
    success = sftp.WriteFileBd(handle,bd);
    if (success == false) {
        std::cout << sftp.lastErrorText() << "\r\n";
        return;
    }

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

    std::cout << "Wrote " << bd.get_NumBytes() << " bytes." << "\r\n";

    sftp.Disconnect();
    }