(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_CkHttp.h>
#include <C_CkHttpRequest.h>
#include <C_CkBinData.h>
#include <C_CkHttpResponse.h>
#include <C_CkStringBuilder.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkHttp http;
    BOOL success;
    HCkHttpRequest req;
    HCkBinData bd;
    HCkHttpResponse resp;
    HCkStringBuilder sbResponseBody;
    HCkJsonObject jResp;
    int respStatusCode;
    const char *id;
    const char *message;

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

    http = CkHttp_Create();

    CkHttp_putLogin(http,"api");
    CkHttp_putPassword(http,"sending_api_key");    //  Replace with your actual sending API key.

    req = CkHttpRequest_Create();
    CkHttpRequest_putHttpVerb(req,"POST");
    CkHttpRequest_putPath(req,"/v3/YOUR_DOMAIN_NAME/messages");
    CkHttpRequest_putContentType(req,"multipart/form-data");

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

    // An a attachd file
    bd = CkBinData_Create();
    success = CkBinData_LoadFile(bd,"qa_data/hamlet.zip");
    if (success == FALSE) {
        printf("Failed to load file attachment.\n");
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkBinData_Dispose(bd);
        return;
    }

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

    // add an image as CID
    success = CkBinData_LoadFile(bd,"qa_data/jpg/starfish.jpg");
    if (success == FALSE) {
        printf("Failed to load HTML image.\n");
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkBinData_Dispose(bd);
        return;
    }

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

    resp = CkHttp_SynchronousRequest(http,"api.mailgun.net",443,TRUE,req);
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkBinData_Dispose(bd);
        return;
    }

    sbResponseBody = CkStringBuilder_Create();
    CkHttpResponse_GetBodySb(resp,sbResponseBody);
    jResp = CkJsonObject_Create();
    CkJsonObject_LoadSb(jResp,sbResponseBody);
    CkJsonObject_putEmitCompact(jResp,FALSE);

    printf("Response Body:\n");
    printf("%s\n",CkJsonObject_emit(jResp));

    respStatusCode = CkHttpResponse_getStatusCode(resp);
    printf("Response Status Code = %d\n",respStatusCode);
    if (respStatusCode >= 400) {
        printf("Response Header:\n");
        printf("%s\n",CkHttpResponse_header(resp));
        printf("Failed.\n");
        CkHttpResponse_Dispose(resp);
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkBinData_Dispose(bd);
        CkStringBuilder_Dispose(sbResponseBody);
        CkJsonObject_Dispose(jResp);
        return;
    }

    CkHttpResponse_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 = CkJsonObject_stringOf(jResp,"id");
    message = CkJsonObject_stringOf(jResp,"message");


    CkHttp_Dispose(http);
    CkHttpRequest_Dispose(req);
    CkBinData_Dispose(bd);
    CkStringBuilder_Dispose(sbResponseBody);
    CkJsonObject_Dispose(jResp);

    }