编写chrome插件，调用本地应用程序，并进行通讯（发送信息给应用程序）

开发说明

1、浏览器插件实现
manifest.json文件内容。每个chrome的插件都需要该文件，该文件记录插件的关键信息

{

    "name" : "callapp",

    "version" : "1.0.1",

    "description" : "call local application",

    "background" : { "scripts": ["background.js"] },

    "icons": {

        "16": "16.png",

        "128": "128.png"

    },

    "permissions" : [

    "nativeMessaging",

    "contextMenus",

    "tabs"

    ],

    "minimum_chrome_version" : "6.0.0.0",

    "manifest_version": 2

}

其中由于需要在右键菜单中增加选项，在permissions中增加"nativeMessaging"、"contextMenus"两项；需要和本地程序进行通讯，增加"nativeMessaging"项

maniffest.json所需要的background.js

//Author: jyx

//Date: 2014.10.11

//Description: This is a javaScript file use for handle contextMenus action

//When click the contextMenus, it will sent the infomation to native app



//connect to native app

var port = null;

var nativeHostName = "com.ctrip.ops.mysql.callapp";//chrome与本地程序通信的桥梁，根据该名称进行配置项的寻找。windows下在注册表HKEY_CURRENT_USER\Software\Google\Chrome\NativeMessagingHosts内寻找，linux下在目录/etc/opt/chrome/native-messaging-hosts/寻找该名称的json文件（本例子为com.ctrip.ops.mysql.callapp.json）



//onNativeDisconnect

function onDisconnected()

{

    //alert("连接到FastDownload服务失败: " + chrome.runtime.lastError.message);

    port = null;

}



//connect to native host and get the communicatetion port

function connectToNativeHost()

{

    port = chrome.runtime.connectNative(nativeHostName);//根据配置文件连接到本地程序

    port.onDisconnect.addListener(onDisconnected);

}



//调用connectToNativeHost函数连接到本地程序，完成后使用port.postMessage函数将纤细传递给应用程序

//将信息写入I/O流与本地程序通信

function getClickHandler() {

      return function(info, tab) { 

        connectToNativeHost();

        port.postMessage(info.linkUrl);

      };

};



//在浏览器启动时即创建右键菜单，在页面链接上右击鼠标会显示该菜单，当点击"start program"的时候就会调用getClickHandler（）函数处理

 chrome.contextMenus.create({

    "title" : "start program",

    "type" : "normal",

     "id": "callapp",

    "contexts" : ["link"],

     "enabled": true,

    "onclick" : getClickHandler()

});

程序中nativeHostName需要特殊说明，正是通过该变量，chrome的插件找到调用本地程序的配置
本文的实验环境为windows7，在注册表的HKEY_CURRENT_USER\Software\Google\Chrome\NativeMessagingHosts中创建对应的项，注册表导出内容如下Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Google\Chrome\NativeMessagingHosts\com.ctrip.ops.mysql.callapp]

@="D:\\temp\\chromeExtension\\callapp\\callapp.json"

linux下参考http://match-yang.blog.163.com/blog/static/2109902542014319103739996/

2、浏览器调用配置

callapp.json
该文件的路径保存在注册表的HKEY_CURRENT_USER\Software\Google\Chrome\NativeMessagingHosts\com.ctrip.ops.mysql.callapp项内

{

    "name": "com.ctrip.ops.mysql.callapp",

    "description": "Chrome call native app and sent message to app.",

    "path": "C:\\MyApp.exe",

    "type": "stdio",

    "allowed_origins": [

        "chrome-extension://imcfacgnnkhdheiajocckejfmeiokgol/"

    ]

}

3、本地应用程序例子

使用C#进行开发，C++参考http://match-yang.blog.163.com/blog/static/2109902542014319103739996/

using System;

using System.IO;



namespace ConsoleApplication8

{

    class Program

    {

        static void Main(string[] args)

        {

            log2file("--------------------program start at " + DateTime.Now.ToString() + "--------------------");

            if (args.Length != 0)

            {

                for (int i = 0; i < args.Length; i++)

                    log2file("arg " + i.ToString() + args[i]);



                string chromeMessage = OpenStandardStreamIn();

                log2file("--------------------My application starts with Chrome Extension message: " + chromeMessage + "---------------------------------");

            }

            log2file("--------------------program end at " + DateTime.Now.ToString() + "--------------------");

        }

        static void log2file(string s)

        {

            FileStream fs = new FileStream(@"c:\test.log", FileMode.Append);

            StreamWriter sw = new StreamWriter(fs);

            sw.WriteLine(s);

            sw.Close();

            fs.Close();

        }



        private static string OpenStandardStreamIn()

        {

            //// We need to read first 4 bytes for length information  

            Stream stdin = Console.OpenStandardInput();

            int length = 0;

            byte[] bytes = new byte[4];

            stdin.Read(bytes, 0, 4);

            length = System.BitConverter.ToInt32(bytes, 0);



            string input = "";

            for (int i = 0; i < length; i++)

            {

                input += (char)stdin.ReadByte();

            }



            return input;

        }

    }

}

说明：
background.js代码根据如下链接，进行了一些非框架性的修改，主要是注释，不过还是修改了一下author
http://match-yang.blog.163.com/blog/static/2109902542014319103739996/

参考：
讲解如何在浏览器的右键菜单中增加
http://my.oschina.net/ruben/blog/92813
讲解调用本地的应用程序
http://match-yang.blog.163.com/blog/static/2109902542014319103739996/
http://blog.csdn.net/talking12391239/article/details/38498557#