(Unicode C++) Download a Specific GMail Message into a Chilkat Email Object

Demonstrates how to download a GMail message into a Chilkat Email object.

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#include <CkHttpW.h>
#include <CkStringBuilderW.h>
#include <CkJsonObjectW.h>
#include <CkEmailW.h>

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

    bool success;

    CkHttpW http;
    http.put_AuthToken(L"GMAIL-ACCESS-TOKEN");

    // The id of the GMail message to download.
    const wchar_t *id = L"166e50fed0b9b0cb";
    const wchar_t *userId = L"me";

    http.SetUrlVar(L"userId",L"me");
    http.SetUrlVar(L"id",id);

    // Fetch the email.
    const wchar_t *url = L"https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw";
    CkStringBuilderW sbJson;
    success = http.DownloadSb(url,L"utf-8",sbJson);
    if (success != true) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    CkJsonObjectW json;
    json.LoadSb(sbJson);
    json.put_EmitCompact(false);

    if (http.get_LastStatus() != 200) {
        wprintf(L"%s\n",json.emit());
        wprintf(L"Failed.\n");
        return;
    }

    // The returned JSON contains something like this:

    // {
    //   "id": "166e50fed0b9b0cb",
    //   "threadId": "166e50fed0b9b0cb",
    //   "labelIds": [
    //     "CATEGORY_SOCIAL",
    //     "INBOX"
    //   ],
    //   "snippet": "...",
    //   "historyId": "582477",
    //   "internalDate": "1541441317000",
    //   "sizeEstimate": 28603,
    //   "raw": "BASE64URL_CONTENT"
    // }

    // The RFC822 MIME of the email is contained in the "raw" as a base64URL encoded string.
    // Let's decode and load into a Chilkat email object..
    CkStringBuilderW sbRaw;
    json.StringOfSb(L"raw",sbRaw);
    sbRaw.Decode(L"base64url",L"utf-8");

    CkEmailW email;
    email.SetFromMimeSb(sbRaw);

    // Now we can use the email API to do whatever we desire..
    wprintf(L"From: %s\n",email.fromAddress());
    wprintf(L"Subject: %s\n",email.subject());
    // ...
    }