(Unicode C++) 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.

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#include <CkRestW.h>
#include <CkOAuth2W.h>
#include <CkJsonObjectW.h>
#include <CkStreamW.h>

void ChilkatSample(void)
    {
    //  This requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkRestW rest;
    bool success;

    //    Provide a previously obtained OAuth2 access token.
    CkOAuth2W oauth2;
    oauth2.put_AccessToken(L"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(L"upload.box.com",443,true,bAutoReconnect);
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        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(L"Content-Type",L"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"}}
    CkJsonObjectW jsonAttr;
    jsonAttr.UpdateString(L"name",L"hedgehogs.jpg");
    jsonAttr.UpdateString(L"parent.id",L"0");

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

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

    //  IMPORTANT: This example requires Chilkat v9.5.0.70 or later, for a fix that was made in
    //  multipart/streaming uploads.
    CkStreamW fileStream;
    fileStream.put_SourceFile(L"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(L"0");

    //  Send the multipart/form-data request, which uploads the file by streaming directly from the filesystem.
    const wchar_t *responseBody = rest.fullRequestMultipart(L"POST",L"/api/2.0/files/content");
    if (rest.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    //  A 201 is received for a successful upload
    if (rest.get_ResponseStatusCode() != 201) {
        wprintf(L"Box.com upload failed.\n");
        wprintf(L"Request header:\n");
        wprintf(L"%s\n",rest.lastRequestHeader());
        wprintf(L"---\n");
        wprintf(L"Response status code = %d\n",rest.get_ResponseStatusCode());
        wprintf(L"Response body:\n");
        wprintf(L"%s\n",responseBody);
        return;
    }

    wprintf(L"File uploaded.\n");
    }