Zig
Outlook Send Email using MIME Format

This example sends an email using MIME format via the Microsoft Graph Outlook REST API.
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).

    const json_token = try chilkat.JsonObject.init();
    defer json_token.deinit();
    json_token.loadFile("qa_data/tokens/microsoftGraph.json") catch {
        std.debug.print("{s}\n", .{try json_token.getLastErrorText(alloc)});
        return;
    };

    http.setAuthToken(try json_token.stringOf(alloc, "access_token"));

    // To send email, 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.)
    //

    // The body of the POST request will contain the MIME source of the email in base64 format.

    // Create a new email object
    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setSubject("Test Outlook API to Send HTML Email with Attachments");
    email.setFrom("Mary <mary@somewhere.com>");
    email.addTo("Joe", "joe@example.com") catch {};

    // Add a plain-text alternative body, which will likely never be seen.
    // (It is shown if the receiving email client is incapable of displaying HTML email.)
    email.addPlainTextAlternativeBody("This is a plain-text alternative body...") catch {};

    // Our HTML will include an image, so add the related image here.
    const content_id_starfish = email.addRelatedFile(alloc, "qa_data/jpg/starfish.jpg") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    // The src attribute for the image tag is set to the contentIdStarfish:
    const sb_html = try chilkat.StringBuilder.init();
    defer sb_html.deinit();
    sb_html.append("<html><body><p>This is an HTML email with an embedded image.</p>") catch {};
    sb_html.append("<p><img src=\"cid:CONTENT_ID_STARFISH\" /></p></body></html>") catch {};
    _ = sb_html.replace("CONTENT_ID_STARFISH", content_id_starfish);

    email.addHtmlAlternativeBody(try sb_html.getAsString(alloc)) catch {};

    // Finally, add some attachments to the email.
    // Add a file attachment.
    email.addFileAttachment2("qa_data/pdf/fishing.pdf", "application/pdf") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    // Add an attachment where the content is contained in a string.
    const content = "This is the content of the 2nd attached file.";
    email.addStringAttachment("someText.txt", content) catch {};

    // Get the email as multi-line base64..
    const bd_mime = try chilkat.BinData.init();
    defer bd_mime.deinit();
    email.getMimeBd(bd_mime) catch {};

    // Now get it as multi-line base64
    const sb_base64 = try chilkat.StringBuilder.init();
    defer sb_base64.deinit();
    bd_mime.getEncodedSb("base64_mime", sb_base64) catch {};

    // Send the HTTP POST (i.e. send the email)
    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpSb("POST", "https://graph.microsoft.com/v1.0/me/sendMail", sb_base64, "utf-8", "text/plain", 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) {
        const json = try chilkat.JsonObject.init();
        defer json.deinit();
        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 Mail Sent.\n", .{});
    }
}