(Unicode C) Send GMail using REST API

Demonstrates how to send an email using the GMail REST API.

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#include <C_CkEmailW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkHttpW.h>
#include <C_CkHttpResponseW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkEmailW email;
    const wchar_t *cid;
    HCkStringBuilderW sbHtml;
    int numReplacements;
    HCkStringBuilderW sbMime;
    HCkJsonObjectW json;
    HCkHttpW http;
    const wchar_t *url;
    HCkHttpResponseW resp;

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

    // Use the Chilkat Email API to create or load an email.
    email = CkEmailW_Create();

    // The From name/address don't need to be specified. 
    // GMail will automatically use your Gmail address if the following 2 lines are omitted.
    CkEmailW_putFromName(email,L"My Name");
    CkEmailW_putFromAddress(email,L"my_account_name@gmail.com");

    CkEmailW_AddTo(email,L"John Smith",L"somebody@somewhere.com");
    // To add more recipients, make additional calls to AddTo or AddCC, one per recipient...

    CkEmailW_putSubject(email,L"This is a test GMail email created using Chilkat.");
    CkEmailW_putCharset(email,L"utf-8");
    CkEmailW_AddPlainTextAlternativeBody(email,L"This is a test");

    // Create an HTML email body with an embedded image.
    cid = CkEmailW_addRelatedFile(email,L"qa_data/jpg/starfish.jpg");
    sbHtml = CkStringBuilderW_Create();
    CkStringBuilderW_Append(sbHtml,L"<html><body>This is a <b>test</b><br><img src=\"cid:STARFISH_CID\"/></body></html>");
    numReplacements = CkStringBuilderW_Replace(sbHtml,L"STARFISH_CID",cid);

    CkEmailW_AddHtmlAlternativeBody(email,CkStringBuilderW_getAsString(sbHtml));

    // OK.. we now have an HTML email with an embedded JPG image
    // We'll need to get the full MIME of the email encoded to a base64url string.
    sbMime = CkStringBuilderW_Create();
    CkEmailW_GetMimeSb(email,sbMime);
    CkStringBuilderW_Encode(sbMime,L"base64url",L"utf-8");

    // The body of the HTTP request will be JSON..
    json = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateSb(json,L"raw",sbMime);

    // Send the email...
    http = CkHttpW_Create();
    CkHttpW_putAuthToken(http,L"GMAIL-ACCESS-TOKEN");

    url = L"https://www.googleapis.com/gmail/v1/users/me/messages/send";
    resp = CkHttpW_PostJson3(http,url,L"application/json",json);
    if (CkHttpW_getLastMethodSuccess(http) != TRUE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkEmailW_Dispose(email);
        CkStringBuilderW_Dispose(sbHtml);
        CkStringBuilderW_Dispose(sbMime);
        CkJsonObjectW_Dispose(json);
        CkHttpW_Dispose(http);
        return;
    }

    // A status code of 200 indicates success.
    wprintf(L"Response status code: %d\n",CkHttpResponseW_getStatusCode(resp));
    wprintf(L"Response body:\n");
    wprintf(L"%s\n",CkHttpResponseW_bodyStr(resp));
    CkHttpResponseW_Dispose(resp);

    // The response body contains JSON.
    // Use the online tool at Generate JSON Parsing Code
    // to generate JSON parsing code.

    // A sample successful JSON response:

    // {
    //  "id": "166f0d4ac39e50bf",
    //  "threadId": "166f0d4ac39e50bf",
    //  "labelIds": [
    //   "SENT"
    //  ]
    // }


    CkEmailW_Dispose(email);
    CkStringBuilderW_Dispose(sbHtml);
    CkStringBuilderW_Dispose(sbMime);
    CkJsonObjectW_Dispose(json);
    CkHttpW_Dispose(http);

    }