带有 Chrome Native Messaging 的 C# 本机主机 [英] C# native host with Chrome Native Messaging

问题描述

我今天花了几个小时研究如何让 Chrome 本地消息传递与 C# 本地主机一起工作.从概念上讲，这很简单，但我在这些其他问题的帮助下(部分)解决了一些问题:

I spent a few hours today researching how to get Chrome native messaging working with a C# native host. Conceptually it was quite simple, but there were a few snags that I resolved with help (in part) from these other questions:

本机消息传递 Chrome
从chrome扩展到本地主机的本地消息传递用 C# 编写
通过很慢大"从 Chrome 扩展程序到主机的数据量(用 C# 编写)

我的解决方案发布在下面.

My solution is posted below.

推荐答案

假设清单设置正确，以下是使用端口"方法与 C# 主机对话的完整示例:

Assuming the manifest is set up properly, here is a complete example for talking to a C# host using the "port" method:

using System;
using System.IO;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace NativeMessagingHost
{
   class Program
   {
      public static void Main(string[] args)
      {
         JObject data;
         while ((data = Read()) != null)
         {
            var processed = ProcessMessage(data);
            Write(processed);
            if (processed == "exit")
            {
               return;
            }
         }
      }

      public static string ProcessMessage(JObject data)
      {
         var message = data["text"].Value<string>();
         switch (message)
         {
            case "test":
               return "testing!";
            case "exit":
               return "exit";
            default:
               return "echo: " + message;
         }
      }

      public static JObject Read()
      {
         var stdin = Console.OpenStandardInput();
         var length = 0;

         var lengthBytes = new byte[4];
         stdin.Read(lengthBytes, 0, 4);
         length = BitConverter.ToInt32(lengthBytes, 0);

         var buffer = new char[length];
         using (var reader = new StreamReader(stdin))
         {
            while (reader.Peek() >= 0)
            {
               reader.Read(buffer, 0, buffer.Length);
            }
         }

         return (JObject)JsonConvert.DeserializeObject<JObject>(new string(buffer));
      }

      public static void Write(JToken data)
      {
         var json = new JObject();
         json["data"] = data;

         var bytes = System.Text.Encoding.UTF8.GetBytes(json.ToString(Formatting.None));

         var stdout = Console.OpenStandardOutput();
         stdout.WriteByte((byte)((bytes.Length >> 0) & 0xFF));
         stdout.WriteByte((byte)((bytes.Length >> 8) & 0xFF));
         stdout.WriteByte((byte)((bytes.Length >> 16) & 0xFF));
         stdout.WriteByte((byte)((bytes.Length >> 24) & 0xFF));
         stdout.Write(bytes, 0, bytes.Length);
         stdout.Flush();
      }
   }
}

如果您不需要主动与主机通信，使用 runtime.sendNativeMessage 就可以了.为了防止主机挂起，只需删除 while 循环并执行一次读/写.

If you don't need to actively communicate with the host, using runtime.sendNativeMessage will work fine. To prevent the host from hanging, simply remove the while loop and do Read/Write once.

为了测试这一点，我使用了谷歌在此处提供的示例项目:https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/docs/examples/api/nativeMessaging

To test this, I used the example project provided by Google here: https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/docs/examples/api/nativeMessaging

注意:我使用 Json.NET 来简化 json 序列化/反序列化过程.

Note: I'm using Json.NET to simplify the json serialization/de-serialization process.

我希望这对某人有帮助！

I hope this is helpful to somebody!

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