(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 <C_CkHttpW.h>
#include <C_CkHttpRequestW.h>
#include <C_CkBinDataW.h>
#include <C_CkHttpResponseW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    HCkHttpW http;
    BOOL success;
    HCkHttpRequestW req;
    HCkBinDataW bd;
    HCkHttpResponseW resp;
    HCkStringBuilderW sbResponseBody;
    HCkJsonObjectW jResp;
    int respStatusCode;
    const wchar_t *id;
    const wchar_t *message;

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

    http = CkHttpW_Create();

    CkHttpW_putLogin(http,L"api");
    CkHttpW_putPassword(http,L"sending_api_key");    //  Replace with your actual sending API key.

    req = CkHttpRequestW_Create();
    CkHttpRequestW_putHttpVerb(req,L"POST");
    CkHttpRequestW_putPath(req,L"/v3/YOUR_DOMAIN_NAME/messages");
    CkHttpRequestW_putContentType(req,L"multipart/form-data");

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

    // An a attachd file
    bd = CkBinDataW_Create();
    success = CkBinDataW_LoadFile(bd,L"qa_data/hamlet.zip");
    if (success == FALSE) {
        wprintf(L"Failed to load file attachment.\n");
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkBinDataW_Dispose(bd);
        return;
    }

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

    // add an image as CID
    success = CkBinDataW_LoadFile(bd,L"qa_data/jpg/starfish.jpg");
    if (success == FALSE) {
        wprintf(L"Failed to load HTML image.\n");
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkBinDataW_Dispose(bd);
        return;
    }

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

    resp = CkHttpW_SynchronousRequest(http,L"api.mailgun.net",443,TRUE,req);
    if (CkHttpW_getLastMethodSuccess(http) == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkBinDataW_Dispose(bd);
        return;
    }

    sbResponseBody = CkStringBuilderW_Create();
    CkHttpResponseW_GetBodySb(resp,sbResponseBody);
    jResp = CkJsonObjectW_Create();
    CkJsonObjectW_LoadSb(jResp,sbResponseBody);
    CkJsonObjectW_putEmitCompact(jResp,FALSE);

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

    respStatusCode = CkHttpResponseW_getStatusCode(resp);
    wprintf(L"Response Status Code = %d\n",respStatusCode);
    if (respStatusCode >= 400) {
        wprintf(L"Response Header:\n");
        wprintf(L"%s\n",CkHttpResponseW_header(resp));
        wprintf(L"Failed.\n");
        CkHttpResponseW_Dispose(resp);
        CkHttpW_Dispose(http);
        CkHttpRequestW_Dispose(req);
        CkBinDataW_Dispose(bd);
        CkStringBuilderW_Dispose(sbResponseBody);
        CkJsonObjectW_Dispose(jResp);
        return;
    }

    CkHttpResponseW_Dispose(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

    id = CkJsonObjectW_stringOf(jResp,L"id");
    message = CkJsonObjectW_stringOf(jResp,L"message");


    CkHttpW_Dispose(http);
    CkHttpRequestW_Dispose(req);
    CkBinDataW_Dispose(bd);
    CkStringBuilderW_Dispose(sbResponseBody);
    CkJsonObjectW_Dispose(jResp);

    }