(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 <C_CkHttp.h>
#include <C_CkStringBuilder.h>
#include <C_CkJsonObject.h>
#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttp http;
    const char *id;
    const char *userId;
    const char *url;
    HCkStringBuilder sbJson;
    HCkJsonObject json;
    HCkStringBuilder sbRaw;
    HCkEmail email;

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

    http = CkHttp_Create();
    CkHttp_putAuthToken(http,"GMAIL-ACCESS-TOKEN");

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

    CkHttp_SetUrlVar(http,"userId","me");
    CkHttp_SetUrlVar(http,"id",id);

    // Fetch the email.
    url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw";
    sbJson = CkStringBuilder_Create();
    success = CkHttp_DownloadSb(http,url,"utf-8",sbJson);
    if (success != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkStringBuilder_Dispose(sbJson);
        return;
    }

    json = CkJsonObject_Create();
    CkJsonObject_LoadSb(json,sbJson);
    CkJsonObject_putEmitCompact(json,FALSE);

    if (CkHttp_getLastStatus(http) != 200) {
        printf("%s\n",CkJsonObject_emit(json));
        printf("Failed.\n");
        CkHttp_Dispose(http);
        CkStringBuilder_Dispose(sbJson);
        CkJsonObject_Dispose(json);
        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..
    sbRaw = CkStringBuilder_Create();
    CkJsonObject_StringOfSb(json,"raw",sbRaw);
    CkStringBuilder_Decode(sbRaw,"base64url","utf-8");

    email = CkEmail_Create();
    CkEmail_SetFromMimeSb(email,sbRaw);

    // Now we can use the email API to do whatever we desire..
    printf("From: %s\n",CkEmail_fromAddress(email));
    printf("Subject: %s\n",CkEmail_subject(email));
    // ...


    CkHttp_Dispose(http);
    CkStringBuilder_Dispose(sbJson);
    CkJsonObject_Dispose(json);
    CkStringBuilder_Dispose(sbRaw);
    CkEmail_Dispose(email);

    }