(Unicode C) SendGrid HTML Email with Embedded Images

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

Note: This example requires Chilkat v11.0.0 or greater.

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttpRequestW req;
    HCkHttpW http;
    HCkBinDataW bdJpg;
    HCkStringBuilderW sbHtml;
    HCkJsonObjectW json;
    HCkHttpResponseW resp;

    success = FALSE;

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

    req = CkHttpRequestW_Create();
    http = CkHttpW_Create();

    // 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;" />
    bdJpg = CkBinDataW_Create();
    success = CkBinDataW_LoadFile(bdJpg,L"qa_data/jpg/starfish.jpg");
    if (success == FALSE) {
        wprintf(L"Failed to load JPG file.\n");
        CkHttpRequestW_Dispose(req);
        CkHttpW_Dispose(http);
        CkBinDataW_Dispose(bdJpg);
        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.
    sbHtml = CkStringBuilderW_Create();
    CkStringBuilderW_Append(sbHtml,L"<html><body><b>This is a test<b><br /><img src=\"data:image/jpeg;base64,");
    // Append the base64 image data to sbHtml.
    CkBinDataW_GetEncodedSb(bdJpg,L"base64",sbHtml);
    CkStringBuilderW_Append(sbHtml,L"\" alt=\"\" style=\"border-width:0px;\" /></body></html>");

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

    CkHttpW_putAuthToken(http,L"SENDGRID_API_KEY");

    resp = CkHttpResponseW_Create();
    success = CkHttpW_HttpJson(http,L"POST",L"https://api.sendgrid.com/v3/mail/send",json,L"application/json",resp);
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpRequestW_Dispose(req);
        CkHttpW_Dispose(http);
        CkBinDataW_Dispose(bdJpg);
        CkStringBuilderW_Dispose(sbHtml);
        CkJsonObjectW_Dispose(json);
        CkHttpResponseW_Dispose(resp);
        return;
    }

    wprintf(L"response status code: %d\n",CkHttpResponseW_getStatusCode(resp));
    // 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.)
    wprintf(L"%s\n",CkHttpResponseW_bodyStr(resp));


    CkHttpRequestW_Dispose(req);
    CkHttpW_Dispose(http);
    CkBinDataW_Dispose(bdJpg);
    CkStringBuilderW_Dispose(sbHtml);
    CkJsonObjectW_Dispose(json);
    CkHttpResponseW_Dispose(resp);

    }