desktop-app/node_modules/common.js

var fs = require('fs');
var User = require('user');
var File = require('file');
var Evt = require('evt');
var ObjectId = require('objectid');

// var gui = require('nw.gui');
// console.log(gui.App);

function log(o) {console.log(o)}
// log("<>>>>>>>>>>>>>>>>>>>>");
var Common = {
	objectId: function() {
		return ObjectId()
	},
	_uuid: 1,
	uuid: function() {
		this._uuid++;
		return ((new Date()).getTime()) + '_' + this._uuid;
	},
	isOk: function(ret) {
		if(!ret) {
			return ret;
		}
	
		if(typeof ret == 'object') {
			// 数组
			if('length' in ret) {
				return true;
			}
			if('Ok' in ret && !ret.Ok) { // 指明了Ok
				return false;
			}
			return true;
		}
		return false;
	},
	// FileReaderWeb 是 web上的FileReader, 可能与nodejs这个有冲突
	pasteImage: function(event, FileReaderWeb, callback) {
		var me = this;
		var items = (event.clipboardData  || event.originalEvent.clipboardData).items; // 可能有多个file, 找到属于图片的file
		// find pasted image among pasted items
		var blob;
	    for (var i = 0; i < items.length; i++) {
	    	if (items[i].type.indexOf("image") === 0) {
	    		blob = items[i].getAsFile();
		    }
		}
		// console.log("paste images");
		// console.log(blob);
		// load image if there is a pasted image
		if (blob) {
			// console.log("??");
		    var reader = new FileReaderWeb();
		    // console.log(">>")
		    // console.log(reader);
		    // console.log(">>")
		    reader.onloadend = function() { 
		    	console.log(reader);
				// 这个事件在读取结束后，无论成功或者失败都会触发
				if (reader.error) { 
					console.log(reader.error); 
				} else {
				}
			}
		    reader.onload = function(e) {
		      	// 上传之
		      	// log('result');
		      	// log(reader.result);
		      	var ret = reader.result
		      	ret = ret.replace(/^data:image\/\w+;base64,/, "")
		      	// log(User.getCurUserImagesPath());
		      	var filename = me.uuid() + '.png';
				fs.writeFile(User.getCurUserImagesPath() + '/' + filename, new Buffer(ret, 'base64'), function(err) {  
					if(err) {
						log(err);
						return;
					}
					// 保存
					var relativePath = User.getCurUserImagesAppPath() + '/' + filename;
					File.addImage(relativePath);

					callback && callback('app://leanote/' + relativePath);
				}); 
		    };
		    reader.readAsDataURL(blob);
		}
	},
};
module.exports = Common;