(Unicode C++) Initiate Resumable Upload Session

See more Google Cloud Storage Examples

For more information, see https://cloud.google.com/storage/docs/performing-resumable-uploads

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#include <CkHttpW.h>
#include <CkJsonObjectW.h>
#include <CkHttpResponseW.h>

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

    CkHttpW http;

    CkJsonObjectW jsonToken;
    bool success = jsonToken.LoadFile(L"qa_data/tokens/googleCloudStorage.json");
    if (success == false) {
        wprintf(L"%s\n",jsonToken.lastErrorText());
        return;
    }

    CkJsonObjectW jsonMetaData;
    jsonMetaData.UpdateString(L"contentType",L"image/jpeg");

    // Adds the "Authorization: Bearer <access_token>" header..
    http.put_AuthToken(jsonToken.stringOf(L"access_token"));

    http.SetUrlVar(L"bucket_name",L"chilkat-bucket-b");
    http.SetUrlVar(L"object_name",L"penguins2.jpg");
    const wchar_t *url = L"https://storage.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=resumable&name={$object_name}";
    CkHttpResponseW *resp = http.PText(L"POST",url,jsonMetaData.emit(),L"utf-8",L"application/json",false,false);
    if (http.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    int statusCode = resp->get_StatusCode();
    wprintf(L"response status code = %d\n",statusCode);

    const wchar_t *sessionUrl = L"";

    if (statusCode != 200) {
        wprintf(L"%s\n",resp->bodyStr());
    }
    else {
        // The session URL will be used to upload the file in chunks, in subsequent HTTP POSTs...
        sessionUrl = resp->getHeaderField(L"Location");
        wprintf(L"Session URL = %s\n",sessionUrl);
    }

    delete resp;
    }