C# native 主机与 Chrome native 消息传递

Question

我今天花了几个小时研究如何让 Chrome 原生消息与 C# 原生主机一起工作。从概念上讲，它非常简单，但在这些其他问题的帮助下(部分)我解决了一些问题:

Native Messaging Chrome
Native messaging from chrome extension to native host written in C#
Very Slow to pass "large" amount of data from Chrome Extension to Host (written in C#)

我的解决方案发布在下面。

Answer 1

假设 list 设置正确，下面是使用“端口”方法与 C# 主机通信的完整示例:

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。为防止主机挂起，只需删除 while 循环并执行一次读/写。

为了对此进行测试，我在这里使用了 Google 提供的示例项目: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。

希望对大家有所帮助!