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–>

node-webkit教程(7)Platform Service之APP

文/玄魂

前言

几个月前，要开发一个简易的展示应用，要求支持离线播放（桌面应用）和在线播放（web应用）。

当时第一想到的是flex，同一套代码（或者只需少量的更改）就可以同时运行在桌面和浏览器上。由于很多展现效果要全新开发，我想到了impress.js(https://github.com/bartaz/impress.js/)。如果选择impress.js，就意味着要将html5作为桌面应用，当时想到要封装webkit，但是本人对这方面也不是很熟悉，时间也很有限，就又沿着这个方向搜索，找到了node-webkit(https://github.com/rogerwang/node-webkit)。

node-webkit解决了我通过html和js来编写桌面应用的难题。

至于node-webkit的定义，按照作者的说法：

“ 基于node.js和chromium的应用程序实时运行环境，可运行通过HTML(5)、CSS(3)、Javascript来编写的本地应用程序。node.js和webkit的结合体，webkit提供DOM操作，node.js提供本地化操作；且将二者的context完全整合，可在HTML代码中直接使用node.js的API。”

从本篇文章开始，为您介绍Platform Services些列的API，本系列由以下类别：

· App – 每个应用运行时全局api

· Clipboard – 剪贴板

· Tray – 状态栏图标，消息通知

· File dialogs-文件选择对话框

· Shell – 桌面相关

· Handling files and arguments-处理文件和相关参数

7.1 APP 概述

APP类别的API 是针对当前正在运行的应用程序实例的，换个说法是进程级别的（这样说还不准确，node-webkit每一个窗口在单独进程中，应用本身是多进程的）。这些API和程序的启动、关闭关系最密切。但是从目前文档中的API来看，APP类别的API显得不是很丰富。

新建appDemo.html和package.json文件。

package.json内容如下：

{

“name”: “app-demo”,

“main”: “appDemo.html”,

“nodejs”:true,

“window”: {

“title”: “appDemo”,

“toolbar”: true,

“width”: 800,

“height”: 600,

“resizable”:true,

“show_in_taskbar”:true,

“frame”:true,

“kiosk”:false,

“icon”: “2655716405282662783.png”,

“webkit”:{

“plugin”:true

}

appDemo.html内容如下：

<html>

<head>

<title>appDemo</title>

</head>

<body >

// Load native UI library

var gui = require(‘nw.gui’);

var win = gui.Window.get();

</script>

</body>

</html>

7.1 获取APP对象

通过如下方式获得APP对象：

// Load native UI library

var gui = require(‘nw.gui’);

var app = gui.App;

7.2 获取命令行参数

鄙视不标明出处的转载，更多相关内容，欢迎访问玄魂的博客（www.xuanhun521.com）

很多时候，我们启动程序需要从命令行输入参数，可以通过argv、fullArgv和filteredArgv获取输入参数。关于三者的区别参考：https://github.com/rogerwang/node-webkit/wiki/App。我的测试结果和文档还是有出入的。

修改appDemo.html如下：

<html>

<head>

<title>appDemo</title>

</head>

<body >

// Load native UI library

var gui = require(‘nw.gui’);

var app = gui.App;

apendText(app.argv);

apendText(app.fullArgv);

apendText(app.filteredArgv);

function apendText(text)

{

var element = document.createElement(‘div’);

element.appendChild(document.createTextNode(text));

document.body.appendChild(element);

}

</script>

</body>

</html>

在命令行启动程序：

运行结果如下：

7.3 dataPath

应用的数据存储目录，在不同的操作系统上路径不同，Windows: %LOCALAPPDATA%/<name>

Linux: ~/.config/<name>;

OSX:~/Library/Application Support/<name>

这里的<name>是在package.json中定义的name字段的值，所以需要在定义name值的时候保证全局唯一。

7.4 获取manifest

使用manifest属性，可以获取package.json中的json对象。修改appDemo。html的脚本内容如下：

// Load native UI library

var gui = require(‘nw.gui’);

var app = gui.App;

var manifest = app.manifest;

apendText(manifest.name);

function apendText(text)

{

var element = document.createElement(‘div’);

element.appendChild(document.createTextNode(text));

document.body.appendChild(element);

}

</script>

结果如下：

7.5 清除缓存

鄙视不标明出处的转载，更多相关内容，欢迎访问玄魂的博客（www.xuanhun521.com）

可以调用clearCache()方法，清除应用在内存和磁盘上的缓存。

7.6 关闭程序

关闭程序有两个函数可以调用，分别为closeAllWindows()和quit()方法，两者的区别在于closeAllWindows()方法会发送窗口的关闭消息，我们可以监听close事件（参考：http://www.xuanhun521.com/Blog/2014/4/14/node-webkit%E5%AD%A6%E4%B9%A04native-ui-api-%E4%B9%8Bwindow），阻止窗口关闭或者做其他日志等工作。quit()方法不会发送任何消息，直接退出程序。

7.7 Crash dump

从node-webkit 0.8.0版本开始，如果应用崩溃，一个minidump 文件会被保存到磁盘，用以调试和寻找程序崩溃的原因。默认情况下，dump文件保存在系统的临时文件夹中，我们也可以通过api来设置dump文件的存放目录。以下是个版本系统的临时目录：

· Linux: /tmp

· Windows: System temporary directory

· Mac: ~/Library/Breakpad/product name (product name is defined in .plist file in the application bundle)

为了方便测试，node-webkit提供了App.crashBrowser()和App.crashRenderer()两个api，分别保存browser 进程和render进程的数据。下面我们通过实例演示将dump文件保存到本地磁盘D。

// Load native UI library

var gui = require(‘nw.gui’);

var app = gui.App;

app.setCrashDumpDir(‘d:\\’);//设置转储目录

app.crashBrowser();

app.crashRenderer();

function apendText(text)

{

var element = document.createElement(‘div’);

element.appendChild(document.createTextNode(text));

document.body.appendChild(element);

}

</script>

运行程序，应用启动后会崩溃退出，在D盘会看到转储文件：

如何查看转储文件，这里就不详细介绍了，会在专门的文章中讲解，读者现在可以参考文档中的链接：

Decoding the stack trace

To extract the stack trace from the minidump file, you need the minidump_stackwalk tool, symbols file of node-webkit binary and the minidump (.dmp) file generated from the crash.

See http://www.chromium.org/developers/decoding-crash-dumps

http://code.google.com/p/google-breakpad/wiki/GettingStartedWithBreakpad

Symbols file of official node-webkit binary is provided staring from 0.8.0. It can be downloaded from: