(MFC) Box.com Streaming Upload File

Demonstrates how to upload a file to box.com, streaming the file directly from the filesystem.

Note: This example requires a fix that is included in Chilkat v9.5.0.70 and above.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkRest.h>
#include <CkOAuth2.h>
#include <CkJsonObject.h>
#include <CkStream.h>

void ChilkatSample(void)
    {
    CkString strOut;

    //  This requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkRest rest;
    bool success;

    //    Provide a previously obtained OAuth2 access token.
    CkOAuth2 oauth2;
    oauth2.put_AccessToken("BOX_ACCESS_TOKEN");
    rest.SetAuthOAuth2(oauth2);

    //  First, make the initial connection.
    //  A single REST object, once connected, can be used for many Box REST API calls.
    //  The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    //  then it will be automatically re-established as needed.
    bool bAutoReconnect = true;

    //  ----------------------------------------------------------------------
    //  IMPORTANT: Note that the domain is "upload.box.com", not "api.box.com"
    //  ----------------------------------------------------------------------
    success = rest.Connect("upload.box.com",443,true,bAutoReconnect);
    if (success != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  The request body uses the "multipart/form-data" format to transmit two "parts".
    //  The first part is called "attributes" and contains a JSON object with information about the file, including the name of the file
    //  and the ID of the parent folder. The second part contains the contents of the file.
    //  (Note that the name of the second "part" is ignored.)

    rest.AddHeader("Content-Type","multipart/form-data");

    //  Provide the content for each part of the request...

    //  First the JSON attributes.  Use "0" for the root folder.
    //    {"name":"hedgehogs.jpg", "parent":{"id":"0"}}
    CkJsonObject jsonAttr;
    jsonAttr.UpdateString("name","hedgehogs.jpg");
    jsonAttr.UpdateString("parent.id","0");

    rest.put_PartSelector("1");
    rest.AddHeader("Content-Disposition","form-data; name=\"attributes\"; ");
    rest.SetMultipartBodyString(jsonAttr.emit());

    //  The upload will stream directly from a file.
    rest.put_PartSelector("2");
    rest.AddHeader("Content-Disposition","form-data; name=\"file\"; filename=\"hedgehogs.jpg\"");
    //  "application/octet-stream" can be safely used for any type file..
    rest.AddHeader("Content-Type","application/octet-stream");

    //  IMPORTANT: This example requires Chilkat v9.5.0.70 or later, for a fix that was made in
    //  multipart/streaming uploads.
    CkStream fileStream;
    fileStream.put_SourceFile("qa_data/jpg/hedgehogs.jpg");
    rest.SetMultipartBodyStream(fileStream);

    //  Restore the PartSelector to "0" (for safety, in case something else sends another request on this object)
    rest.put_PartSelector("0");

    //  Send the multipart/form-data request, which uploads the file by streaming directly from the filesystem.
    const char *responseBody = rest.fullRequestMultipart("POST","/api/2.0/files/content");
    if (rest.get_LastMethodSuccess() != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  A 201 is received for a successful upload
    if (rest.get_ResponseStatusCode() != 201) {
        strOut.append("Box.com upload failed.");
        strOut.append("\r\n");
        strOut.append("Request header:");
        strOut.append("\r\n");
        strOut.append(rest.lastRequestHeader());
        strOut.append("\r\n");
        strOut.append("---");
        strOut.append("\r\n");
        strOut.append("Response status code = ");
        strOut.appendInt(rest.get_ResponseStatusCode());
        strOut.append("\r\n");
        strOut.append("Response body:");
        strOut.append("\r\n");
        strOut.append(responseBody);
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("File uploaded.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }