通过Dynamic Web TWAIN SDK和Node.js的组合，只需要几行代码就可以实现在浏览器中控制扫描仪，获取图像后上传到远程服务器。

原文：Document
Imaging and Uploading With Dynamic Web TWAIN and Node.js

下载安装

通过Node.js创建server

创建工程目录，打开cmd.exe进入到工程目录，安装下面两个Node.js模块：

1 2	`npm install formidable@latest` `npm install express`

创建server.js，初始化：

var formidable = require('formidable');

var util = require('util');

var express = require('express');

var fs = require('fs');

var app = express();

把静态资源，比如图片，css等，都加载进来：

1	`app.use(express.static(__dirname,` `'/public'));`

要实现跨域访问，需要在header里添加权限，如果不添加，只能local访问：

app.use(function(req, res, next) {

res.header("Access-Control-Allow-Origin", "*");

res.header("Access-Control-Allow-Methods","PUT, POST, GET, DELETE, OPTIONS");

res.header("Access-Control-Allow-Headers","X-Requested-With, content-type");

res.header("Access-Control-Allow-Credentials", true);

next();

});

在POST请求中通过formidable解析数据：

app.post('/upload', function(req, res) {

var form = new formidable.IncomingForm();

form.parse(req, function(err, fields, files) {

// console.log(util.inspect({

// fields: fields,

// files: files

// }));

fs.readFile(files.RemoteFile.path, function(err, data) {

// save file from temp dir to new dir

var newPath = __dirname + "/uploads/" + files.RemoteFile.name;

fs.writeFile(newPath, data, function(err) {

if (err) throw err;

console.log('file saved');

res.end();

});

})

设置好IP和端口：

var server = app.listen(2014, function() {

var host = server.address().address;

var port = server.address().port;

console.log('listening at http://%s:%s', host, port);

})

通过Dynamic Web TWAIN创建client

创建一个网页，包含一个div和两个button：

<html>

<head>

<title>Document Imaging & Uploading</title>

<script src="/Resources/dynamsoft.webtwain.initiate.js"></script>

<script src="/Resources/dynamsoft.webtwain.config.js"></script>

</head>

<body>

<div id="dwtcontrolContainer"></div>

<input type="button" value="Acquire" onclick="AcquireImage();" />

<input id="btnUpload" type="button" value="Upload Image" onclick="btnUpload_onclick()">

</body>

</html>

这里需要把Web TWAIN SDK安装目录下的Resources目录拷贝过来。

加几行代码就可以扫描了：

function AcquireImage(){

DWObject.IfShowUI = false;

DWObject.SelectSource();

DWObject.OpenSource();

DWObject.AcquireImage();

}

到这里可以先测试下扫描能否正常工作。接下来实现远程上传：

function btnUpload_onclick() {

DWObject.HTTPPort = 2014;

var CurrentPathName = unescape(location.pathname); // get current PathName in plain ASCII

var CurrentPath = CurrentPathName.substring(0, CurrentPathName.lastIndexOf("/") + 1);

var strActionPage = CurrentPath + "upload";

var strHostIP = "localhost"; // modify the IP for cross-domain access

var sFun = function(){

alert('successful');

}, fFun = function(){

alert('failed');

};

DWObject.HTTPUploadThroughPostEx(

strHostIP,

DWObject.CurrentImageIndexInBuffer,

strActionPage,

"test.jpg",

1,// JPEG

sFun, fFun

);

}

测试下。命令行启动server：

1	`node server.js`

打开http://localhost:2014就可以玩了。

源码

https://github.com/DynamsoftRD/nodejs-dwt

1	`git clone https://github.com/DynamsoftRD/nodejs-dwt.git`

巴特西

Node.js+Web TWAIN，实现Web文档扫描和图像上传

下载安装

通过Node.js创建server

通过Dynamic Web TWAIN创建client

源码

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