Zig Requires Chilkat v11.0.0+
Outlook Send HTML Email

This example sends an HTML email. Other examples exist for:
Sending plain-text email.
Sending HTML email with embedded images.
Sending email with attachments.
Sending HTML email with embedded images and attachments.
Chilkat Zig Downloads

Zig
const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    const http = try chilkat.Http.init();
    defer http.deinit();

    // Use your previously obtained access token here:
    // See the following examples for getting an access token:
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
    //    Refresh Access Token (Azure AD v2.0 Endpoint).
    //    Refresh Access Token (Azure AD Endpoint).

    http.setAuthToken("MICROSOFT_GRAPH_ACCESS_TOKEN");

    // To send mail, we'll POST to the following endpoint:
    //
    // POST /users/{id | userPrincipalName}/sendMail
    //
    // (The special keyword "me" may be used in place of a principal name.)
    //

    // This example will send HTML email containing the following HTML body:

    //     <html>
    //     <head>
    //     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    //     <meta content="text/html; charset=utf-8">
    //     </head>
    //     <body bgcolor="#FFFFFF">
    //     <font face="Calibri">This is a test <b>HTML email</b>.<br>
    //     </font>
    //     </body>
    //     </html>

    // Build the HTML body...
    const b_crlf = true;
    const sb_html_body = try chilkat.StringBuilder.init();
    defer sb_html_body.deinit();
    sb_html_body.appendLine("<html>", b_crlf) catch {};
    sb_html_body.appendLine("<head>", b_crlf) catch {};
    sb_html_body.appendLine("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">", b_crlf) catch {};
    sb_html_body.appendLine("<meta content=\"text/html; charset=utf-8\">", b_crlf) catch {};
    sb_html_body.appendLine("</head>", b_crlf) catch {};
    sb_html_body.appendLine("<body bgcolor=\"#FFFFFF\">", b_crlf) catch {};
    sb_html_body.appendLine("<font face=\"Calibri\">This is a test <b>HTML email</b>.<br>", b_crlf) catch {};
    sb_html_body.appendLine("</font>", b_crlf) catch {};
    sb_html_body.appendLine("</body>", b_crlf) catch {};
    sb_html_body.appendLine("</html>", b_crlf) catch {};

    // The body of the POST request contains JSON that specifies the email subject, body,
    // recipients, etc.  This example will build the following JSON HTML email:
    //

    //     {
    //       "message": {
    //         "subject": "Sample HTML Email",
    //         "body": {
    //           "contentType": "html",
    //           "content": "The HTML body goes here..."
    //         },
    //         "toRecipients": [
    //           {
    //             "emailAddress": {
    //           "name": "Chilkat Software",
    //               "address": "admin@chilkat.io"
    //             }
    //           },
    //           {
    //             "emailAddress": {
    //               "address": "chilkat.support@gmail.com"
    //             }
    //           }
    //         ],
    //         "ccRecipients": [
    //           {
    //             "emailAddress": {
    //           "name": "Chilkat Blog",
    //           "address": "admin@cknotes.com"
    //             }
    //           }
    //         ]
    //       },
    //       "saveToSentItems": true
    //     }
    //

    // Build the above JSON.
    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.updateString("message.subject", "Sample HTML email") catch {};
    json.updateString("message.body.contentType", "html") catch {};
    json.updateString("message.body.content", try sb_html_body.getAsString(alloc)) catch {};
    json.updateString("message.toRecipients[0].emailAddress.name", "Chilkat Software") catch {};
    json.updateString("message.toRecipients[0].emailAddress.address", "admin@chilkat.io") catch {};
    json.updateString("message.toRecipients[1].emailAddress.address", "chilkat.support@gmail.com") catch {};
    json.updateString("message.ccRecipients[0].emailAddress.name", "Chilkat Blog") catch {};
    json.updateString("message.ccRecipients[0].emailAddress.address", "admin@cknotes.com") catch {};
    json.updateBool("saveToSentItems", true) catch {};

    // Send the HTTP POST (i.e. send the HTML email)
    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpJson("POST", "https://graph.microsoft.com/v1.0/me/sendMail", json, "application/json", resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    // The send succeeded if the response status code = 202.
    // In the success case, there is no response body.  (We just get the response code to know that it succeeded.)
    if (resp.getStatusCode() != 202) {
        json.load(try resp.getBodyStr(alloc)) catch {};
        json.setEmitCompact(false);
        std.debug.print("{s}\n", .{try json.emit(alloc)});
        std.debug.print("Failed, response status code = {d}\n", .{resp.getStatusCode()});
    } else {
        std.debug.print("Outlook HTML Mail Sent.\n", .{});
    }
}