Append message body

The following example shows you how to append (update) message body text.
C++ example
#include <iostream>
#include <vector>
#include <string>

#include "independentsoft/graph/graph_client.hpp"
#include "independentsoft/graph/graph_exception.hpp"
#include "independentsoft/graph/standard_mailbox_folder.hpp"
#include "independentsoft/graph/item_body.hpp"
#include "independentsoft/graph/content_type.hpp"
#include "independentsoft/graph/mails/message.hpp"
#include "independentsoft/graph/mails/message_property_name.hpp"
#include "independentsoft/graph/users/user_id.hpp"
#include "independentsoft/graph/query_options/query.hpp"

using namespace independentsoft::graph;
using namespace independentsoft::graph::mails;
using namespace independentsoft::graph::users;
using namespace independentsoft::graph::query_options;

int main()
{
    try
    {
        GraphClient client;

        client.client_id = "63333333-209e-454e-b7bd-55a4d201270f";
        client.tenant = "independentsoft.onmicrosoft.com";
        client.client_secret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

        Query query;
        query.set_top(999);

        std::vector<Message> messages = sync_wait(client.get_messages(StandardMailboxFolder::Inbox, UserId("info@independentsoft.onmicrosoft.com"), query));

        for (std::size_t i = 0; i < messages.size(); i++)
        {
            std::cout << "Id = " << messages[i].id << std::endl;
            std::cout << "Subject = " << messages[i].subject << std::endl;

            if (!messages[i].body)
            {
                messages[i].body = ItemBody("New message body.", ContentType::Text);
            }
            else if (messages[i].body && messages[i].body->content_type == ContentType::Text)
            {
                messages[i].body->content = messages[i].body->content + " appended message body";
            }
            else if (messages[i].body && messages[i].body->content_type == ContentType::Html)
            {
                std::string& content = messages[i].body->content;
                std::string::size_type pos = content.find("</html>");

                if (pos != std::string::npos)
                {
                    content.replace(pos, std::string("</html>").length(), " <b>appended message body</b></html>");
                }
            }

            Message updatedMessage = sync_wait(client.update_message(messages[i], std::vector<std::string>{ MessagePropertyName::body }));
        }
    }
    catch (const GraphException& ex)
    {
        std::cout << "Error: " << ex.code << std::endl;
        std::cout << "Message: " << ex.message << std::endl;
    }

    return 0;
}
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