如何发送带有嵌入图片的电子邮件

How to send email with embedded pictures

本文关键字：电子邮件 何发送      更新时间：2023-10-16

我需要发送带有嵌入照片的电子邮件。我正在使用一个 html 模板电子邮件，里面有一个 img 标签，如下所示

<img src = "cid:image1">

我正在将模板加载到字符串中，然后将其添加到邮件中，然后添加图像文件部分

using namespace Poco::Net;
// create and initiliase a multipart html email
auto message = std::make_shared<Poco::Net::MailMessage>();
Poco::Net::MediaType mediaType("multipart", "related");
mediaType.setParameter("type", "text/html");
message->setContentType(mediaType);
// add the previously loaded html part
message->addPart("", new Poco::Net::StringPartSource(mailTextHtml, "text/html"), MailMessage::CONTENT_INLINE, MailMessage::ENCODING_QUOTED_PRINTABLE);
// get the image, tag it, and add it to the message
Poco::Net::FilePartSource *image = new Poco::Net::FilePartSource(ofToDataPath(imageFilePathName));
image->headers().add("Content-ID", "<image1>");   // assumes there is an image tag in the HTML for <image1>
message->addPart("", image, MailMessage::CONTENT_INLINE, MailMessage::ENCODING_BASE64);
// Encode the sender and set it.
message->setSender(Poco::Net::MailMessage::encodeWord(senderEMail, "UTF-8"));

这对于某些邮件客户端(outlook，gmail(工作正常，但对于图像作为附件通过的其他邮件客户端(ios，thunderbird(则不行。这是一个真正的问题，因为我们希望邮件同时显示在iPhone和Android上，并在屏幕上显示图片。

是我做错了什么，还是有更好的方法？

下面的

代码可能不是最优雅的实现，但它对我有用。

//This is a VS2017 console app with /clr support enabled.
// SendEmail.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <string>
#using <System.dll>
#using <System.Drawing.dll>
using namespace System;
using namespace System::Net;
using namespace System::Net::Mail;
using namespace System::Net::Mime;
using namespace System::Threading;
using namespace System::ComponentModel;
using namespace System::Runtime::InteropServices;
using namespace System::Text;
using namespace System::Drawing;
using namespace System::Drawing::Imaging;
using namespace System::IO;
int main()
{
    SmtpClient^ client = gcnew SmtpClient(L"smtp.cox.net", 587);
    MailMessage^ message = gcnew MailMessage();
    try
    {
        // Specify the message content.
        // Message body with embedded imeage
        String^ body(L"<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">"
            + L"<HTML><HEAD><META http-equiv=Content-Type content="text/html; charset=iso-8859-1"></HEAD>"
            + L"<BODY><br><h2>The message of the email goes here</h2><br>"
            + L"<DIV style='height:100%; width:460px;'><div style='height:450px; width:450px;'><img src="cid:ImgContId" width='450' height='450' alt='Death' style='margin: 20px 0px 0px 20px;'/></div>"
            + L"</body></html>");
        Image^ newImage = Image::FromFile("C:\Users\xxxxxxxx\Pictures\EmbeddedImg.png");
        ImageConverter^ ic = gcnew ImageConverter();
        array<Byte>^ byteArray = { 1,2,3,4 };
        Type^ byteArrayType = byteArray->GetType();
        array<Byte>^ imgByteArray = (array<Byte>^)ic->ConvertTo(newImage, byteArrayType);
        MemoryStream^ imgMemStrm = gcnew MemoryStream(imgByteArray);
        LinkedResource^ imgResource = gcnew LinkedResource(imgMemStrm);
        imgResource->ContentId = L"ImgContId";
        AlternateView^ avSurrogate;
        AlternateView^ av = avSurrogate->CreateAlternateViewFromString(body, gcnew ContentType(L"text/html; charset=UTF-8"));
        av->LinkedResources->Add(imgResource);
        message->SubjectEncoding = System::Text::Encoding::UTF8;
        message->BodyEncoding = System::Text::Encoding::UTF8;
        message->IsBodyHtml = true;
        message->AlternateViews->Add(av);
        message->From = gcnew MailAddress(L"xxxxxxxx@gmail.com", L"First Last", System::Text::Encoding::UTF8);
        message->Sender = gcnew MailAddress(L"xxxxxxxx@gmail.com", L"First Last", System::Text::Encoding::UTF8);
        message->To->Add(gcnew MailAddress(L"xxxxxxxx@gmail.com", L"Loud Mouth", System::Text::Encoding::UTF8));
        message->Subject = L"RE: xxxxxxxxxxxxxxxxxxxxxxxxxx";
        // Send the message
        client->EnableSsl = true;
        client->Credentials = gcnew NetworkCredential(L"username", L"password");
        client->Send(message);
    }
    catch (Exception^ ex)
    {
        Console::WriteLine(L"Exception caught: {0}", ex->ToString());
    }
    finally
    {
        // Clean up.
        client->~SmtpClient();
        delete message;
        client = nullptr;
        Console::WriteLine("Goodbye.");
    }
    return 0;
}
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