Unicode 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.

Chilkat Unicode C Downloads

Download Chilkat for Unicode C

Unicode C

#include <C_CkSFtpW.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSFtpW sftp;
    int port;
    const wchar_t *password;
    const wchar_t *handle;
    HCkBinDataW bd;

    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.

    sftp = CkSFtpW_Create();

    //  Connect, authenticate, and initialize the SFTP subsystem.
    port = 22;
    success = CkSFtpW_Connect(sftp,L"sftp.example.com",port);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkSFtpW_Dispose(sftp);
        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.
    password = L"mySshPassword";

    success = CkSFtpW_AuthenticatePw(sftp,L"mySshLogin",password);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkSFtpW_Dispose(sftp);
        return;
    }

    success = CkSFtpW_InitializeSftp(sftp);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkSFtpW_Dispose(sftp);
        return;
    }

    //  Open (creating/truncating) the remote file for writing.
    handle = CkSFtpW_openFile(sftp,L"subdir/image.png",L"writeOnly",L"createTruncate");
    if (CkSFtpW_getLastMethodSuccess(sftp) == FALSE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkSFtpW_Dispose(sftp);
        return;
    }

    //  Put the bytes to write into a BinData.  (Here they are loaded from a local file, but the
    //  bytes could come from anywhere.)
    bd = CkBinDataW_Create();
    success = CkBinDataW_LoadFile(bd,L"qa_data/image.png");
    if (success == FALSE) {
        wprintf(L"%s\n",CkBinDataW_lastErrorText(bd));
        CkSFtpW_Dispose(sftp);
        CkBinDataW_Dispose(bd);
        return;
    }

    //  Append the BinData bytes to the open remote file.
    success = CkSFtpW_WriteFileBd(sftp,handle,bd);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkSFtpW_Dispose(sftp);
        CkBinDataW_Dispose(bd);
        return;
    }

    success = CkSFtpW_CloseHandle(sftp,handle);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkSFtpW_Dispose(sftp);
        CkBinDataW_Dispose(bd);
        return;
    }

    wprintf(L"Wrote %d bytes.\n",CkBinDataW_getNumBytes(bd));

    CkSFtpW_Disconnect(sftp);


    CkSFtpW_Dispose(sftp);
    CkBinDataW_Dispose(bd);

    }