編寫chrome插件，調用本地應用程序，並進行通訊（發送信息給應用程序）

開發說明

1、瀏覽器插件實現
manifest.json文件內容。每個chrome的插件都需要該文件，該文件記錄插件的關鍵信息

{
    "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
}

其中由於需要在右鍵菜單中增加選項，在permissions中增加"nativeMessaging"、"contextMenus"兩項；需要和本地程序進行通訊，增加"nativeMessaging"項

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與本地程序通信的橋梁，根據該名稱進行配置項的尋找。windows下在注冊表HKEY_CURRENT_USER\Software\Google\Chrome\NativeMessagingHosts內尋找，linux下在目錄/etc/opt/chrome/native-messaging-hosts/尋找該名稱的json文件（本例子為com.ctrip.ops.mysql.callapp.json）

//onNativeDisconnect
function onDisconnected()
{
    //alert("連接到FastDownload服務失敗: " + chrome.runtime.lastError.message);
    port = null;
}

//connect to native host and get the communicatetion port
function connectToNativeHost()
{
    port = chrome.runtime.connectNative(nativeHostName);//根據配置文件連接到本地程序
    port.onDisconnect.addListener(onDisconnected);
}

//調用connectToNativeHost函數連接到本地程序，完成后使用port.postMessage函數將纖細傳遞給應用程序
//將信息寫入I/O流與本地程序通信
function getClickHandler() {
      return function(info, tab) { 
        connectToNativeHost();
        port.postMessage(info.linkUrl);
      };
};

//在瀏覽器啟動時即創建右鍵菜單，在頁面鏈接上右擊鼠標會顯示該菜單，當點擊"start program"的時候就會調用getClickHandler（）函數處理
 chrome.contextMenus.create({
    "title" : "start program",
    "type" : "normal",
     "id": "callapp",
    "contexts" : ["link"],
     "enabled": true,
    "onclick" : getClickHandler()
});

程序中nativeHostName需要特殊說明，正是通過該變量，chrome的插件找到調用本地程序的配置
本文的實驗環境為windows7，在注冊表的HKEY_CURRENT_USER\Software\Google\Chrome\NativeMessagingHosts中創建對應的項，注冊表導出內容如下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下參考http://match-yang.blog.163.com/blog/static/2109902542014319103739996/

2、瀏覽器調用配置

callapp.json
該文件的路徑保存在注冊表的HKEY_CURRENT_USER\Software\Google\Chrome\NativeMessagingHosts\com.ctrip.ops.mysql.callapp項內

{
    "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、本地應用程序例子

使用C#進行開發，C++參考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;
        }
    }
}

說明：
background.js代碼根據如下鏈接，進行了一些非框架性的修改，主要是注釋，不過還是修改了一下author
http://match-yang.blog.163.com/blog/static/2109902542014319103739996/

參考：
講解如何在瀏覽器的右鍵菜單中增加
http://my.oschina.net/ruben/blog/92813
講解調用本地的應用程序
http://match-yang.blog.163.com/blog/static/2109902542014319103739996/
http://blog.csdn.net/talking12391239/article/details/38498557#