(C++) SendGrid HTML Email with Embedded Images

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Demonstrates how to send an HTML email with embedded images using SendGrid.

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#include <CkHttpRequest.h>
#include <CkHttp.h>
#include <CkBinData.h>
#include <CkStringBuilder.h>
#include <CkJsonObject.h>
#include <CkHttpResponse.h>

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

    CkHttpRequest req;
    CkHttp http;

    bool success;

    // First.. load a JPG file and build an HTML img tag with the JPG data inline encoded.
    // Our HTML img tag will look like this:
    // <img src="data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEA3ADcAA..." alt="" style="border-width:0px;" />
    CkBinData bdJpg;
    success = bdJpg.LoadFile("qa_data/jpg/starfish.jpg");
    if (success == false) {
        std::cout << "Failed to load JPG file." << "\r\n";
        return;
    }

    // Note: HTML containing embedded base64 image data may not be visible in all email clients.
    // For example, GMail might not display the image, but viewing in Outlook might be OK.
    CkStringBuilder sbHtml;
    sbHtml.Append("<html><body><b>This is a test<b><br /><img src=\"data:image/jpeg;base64,");
    // Append the base64 image data to sbHtml.
    bdJpg.GetEncodedSb("base64",sbHtml);
    sbHtml.Append("\" alt=\"\" style=\"border-width:0px;\" /></body></html>");

    CkJsonObject json;
    json.UpdateString("personalizations[0].to[0].email","matt@chilkat.io");
    json.UpdateString("personalizations[0].to[0].name","Matt");
    json.UpdateString("from.email","admin@chilkatsoft.com");
    json.UpdateString("subject","Test HTML email with images");
    json.UpdateString("content[0].type","text/html");
    json.UpdateSb("content[0].value",sbHtml);

    http.put_AuthToken("SENDGRID_API_KEY");

    CkHttpResponse *resp = 0;
    resp = http.PostJson3("https://api.sendgrid.com/v3/mail/send","application/json",json);
    if (http.get_LastMethodSuccess() != true) {
        std::cout << http.lastErrorText() << "\r\n";
    }
    else {
        std::cout << "response status code: " << resp->get_StatusCode() << "\r\n";
        // Display the response.
        // If successful, the response code is 202 and the response body string is empty.
        // (The response body string may also be empty for error response codes.)
        std::cout << resp->bodyStr() << "\r\n";
        delete resp;
    }
    }