Bot可以将图像作为消息或附件从用户接收

Question

我希望用户能够将图像作为消息发送给Bot。这可能吗？。我在网上搜索了解决方案，感到很累。请有人至少可以与我分享一个链接吗？

Answer 1

是

来自nodejs文档here

// Create your bot with a function to receive messages from the user

var bot = new builder.UniversalBot(connector, function (session) {
    var msg = session.message;
    if (msg.attachments && msg.attachments.length > 0) {
     // Echo back attachment
     var attachment = msg.attachments[0];
        session.send({
            text: "You sent:",
            attachments: [
                {
                    contentType: attachment.contentType,
                    contentUrl: attachment.contentUrl,
                    name: attachment.name
                }
            ]
        });
    } else {
        // Echo back users text
        session.send("You said: %s", session.message.text);
    }
});

c#文档为here

Answer 2

答案是肯定的，您可以提供您正在使用的频道允许附件。频道对大小和文件类型等内容有限制，因此这取决于您使用的频道。因此，如果您无法获得PDF，请尝试使用图像。如果图像不起作用，请尝试使用较小的图像。

用户将通过模拟器中的通道界面上传文件：

在机器人中接收图像不需要特殊代码。 Activity中的图片将显示为Activity.Attachments这是附件的List，或者是您的案例图片。这可以很容易地从Rajesh的答案中推断出来，但为了完整起见，这是一个用收到的文件做一些事情的例子：

在RootDialog.cs

using Microsoft.Bot.Builder.Dialogs;
using Microsoft.Bot.Connector;
using System;
using System.Net;
using System.Threading.Tasks;

namespace Bot_Application15.Dialogs
{
    [Serializable]
    public class RootDialog : IDialog<object>
    {
        public Task StartAsync(IDialogContext context)
        {
            context.Wait(MessageReceivedAsync);

            return Task.CompletedTask;
        }

        private async Task MessageReceivedAsync(IDialogContext context, IAwaitable<object> result)
        {
            var activity = await result as Activity;

            foreach (var file in activity.Attachments)
            {
                //where the file is hosted
                var remoteFileUrl = file.ContentUrl;
                //where we are saving the file
                var localFileName = @"C:\Users\{UserName}\pictures\test" + file.Name;

                using ( var webClient = new WebClient())
                {
                    webClient.DownloadFile(remoteFileUrl, localFileName);
                }
            }
            await context.PostAsync($"File received");

            context.Wait(MessageReceivedAsync);
        }
    }
}

Answer 3

是的，可以在Bot对话的MessageRecivedAsync方法中使用。

    private async Task MessageReceived(IDialogContext context, IAwaitable<IMessageActivity> result)
    {
        var message = await result;
        if (message.Attachments != null && message.Attachments.Any())
        {
            // Do something with the attachment
        }
        else
        {
            await context.PostAsync("Please upload a picture");
            context.Wait(this.MessageReceived);
        }
    }