(MFC) Send GMail using REST API

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

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkEmail.h>
#include <CkStringBuilder.h>
#include <CkJsonObject.h>
#include <CkHttp.h>
#include <CkHttpResponse.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    bool success;

    // Use the Chilkat Email API to create or load an email.
    CkEmail email;

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

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

    email.put_Subject("This is a test GMail email created using Chilkat.");
    email.put_Charset("utf-8");
    email.AddPlainTextAlternativeBody("This is a test");

    // Create an HTML email body with an embedded image.
    const char *cid = email.addRelatedFile("qa_data/jpg/starfish.jpg");
    CkStringBuilder sbHtml;
    sbHtml.Append("<html><body>This is a <b>test</b><br><img src=\"cid:STARFISH_CID\"/></body></html>");
    int numReplacements = sbHtml.Replace("STARFISH_CID",cid);

    email.AddHtmlAlternativeBody(sbHtml.getAsString());

    // 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.
    CkStringBuilder sbMime;
    email.GetMimeSb(sbMime);
    sbMime.Encode("base64url","utf-8");

    // The body of the HTTP request will be JSON..
    CkJsonObject json;
    json.UpdateSb("raw",sbMime);

    // Send the email...
    CkHttp http;
    http.put_AuthToken("GMAIL-ACCESS-TOKEN");

    const char *url = "https://www.googleapis.com/gmail/v1/users/me/messages/send";
    CkHttpResponse *resp = http.PostJson3(url,"application/json",json);
    if (http.get_LastMethodSuccess() != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // A status code of 200 indicates success.
    strOut.append("Response status code: ");
    strOut.appendInt(resp->get_StatusCode());
    strOut.append("\r\n");
    strOut.append("Response body:");
    strOut.append("\r\n");
    strOut.append(resp->bodyStr());
    strOut.append("\r\n");
    delete 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"
    //  ]
    // }


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }