(Unicode C++) Mailgun Send Send HTML Email with Attachments and HTML Images

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Sends an HTML email with images and attachments.

For more information, see https://documentation.mailgun.com/en/latest/api-sending.html#sending

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#include <CkHttpW.h>
#include <CkHttpRequestW.h>
#include <CkBinDataW.h>
#include <CkHttpResponseW.h>
#include <CkStringBuilderW.h>
#include <CkJsonObjectW.h>

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

    CkHttpW http;
    bool success;

    http.put_Login(L"api");
    http.put_Password(L"sending_api_key");    //  Replace with your actual sending API key.

    CkHttpRequestW req;
    req.put_HttpVerb(L"POST");
    req.put_Path(L"/v3/YOUR_DOMAIN_NAME/messages");
    req.put_ContentType(L"multipart/form-data");

    // Change YOUR_DOMAIN_NAME to something like "mg.your-domain.com".
    req.AddParam(L"from",L"Your Name <mailgun@YOUR_DOMAIN_NAME>");
    req.AddParam(L"to",L"Joe Example <joe@example.com>");
    req.AddParam(L"subject",L"Hello Joe Example");
    req.AddParam(L"html",L"<html><body><b>This is the HTML body</b><br><img src=\"cid:cidStarfish.jpg\"></body></html>");

    // An a attachd file
    CkBinDataW bd;
    success = bd.LoadFile(L"qa_data/hamlet.zip");
    if (success == false) {
        wprintf(L"Failed to load file attachment.\n");
        return;
    }

    req.AddBdForUpload(L"attachment",L"hamlet.zip",bd,L"application/zip");

    // add an image as CID
    success = bd.LoadFile(L"qa_data/jpg/starfish.jpg");
    if (success == false) {
        wprintf(L"Failed to load HTML image.\n");
        return;
    }

    req.AddBdForUpload(L"inline",L"cidStarfish.jpg",bd,L"image/jpeg");

    CkHttpResponseW *resp = http.SynchronousRequest(L"api.mailgun.net",443,true,req);
    if (http.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    CkStringBuilderW sbResponseBody;
    resp->GetBodySb(sbResponseBody);
    CkJsonObjectW jResp;
    jResp.LoadSb(sbResponseBody);
    jResp.put_EmitCompact(false);

    wprintf(L"Response Body:\n");
    wprintf(L"%s\n",jResp.emit());

    int respStatusCode = resp->get_StatusCode();
    wprintf(L"Response Status Code = %d\n",respStatusCode);
    if (respStatusCode >= 400) {
        wprintf(L"Response Header:\n");
        wprintf(L"%s\n",resp->header());
        wprintf(L"Failed.\n");
        delete resp;
        return;
    }

    delete resp;

    // Sample JSON response:
    // (Sample code for parsing the JSON response is shown below)

    // {
    //   "id": "<20210429234809.1.2D550E1C94D3D98F@sandbox0e542e4c577f4bbb98c8bf6b6bca727b.mailgun.org>",
    //   "message": "Queued. Thank you."
    // }

    // Sample code for parsing the JSON response...
    // Use the following online tool to generate parsing code from sample JSON:
    // Generate Parsing Code from JSON

    const wchar_t *id = jResp.stringOf(L"id");
    const wchar_t *message = jResp.stringOf(L"message");
    }