基于标签的Web文档图片分类

Dynamic Web TWAIN的最新版本支提供了Tag管理接口。可以很轻松的给扫描之后的图片进行标记分类。这篇文章分享下如何使用。

Web文档图片分类

创建一个HTML文件，并引用Dynamic Web TWAIN的JS文件：

<script type="text/javascript" src="https://unpkg.com/dwt/dist/dynamsoft.webtwain.min.js"> </script>

组件初始化：

window.onload = function () {
    if (Dynamsoft) {
        // Get a valid trial license from https://www.dynamsoft.com/CustomerPortal/Portal/Triallicense.aspx
        Dynamsoft.WebTwainEnv.ProductKey = 't0126vQIAAGQTYLHjoyjiQ1AsFej37+JgaOeak1T7qjI1MfE2+F9KMLLf9buTDIQAxXItiLN1l7Uj0UZ+bb3OWW78Nci9DawpTRySA2ZkjhhGe7tyM+nDFHndJZ05weNCttEBk2xDM4+id3uEnfk2OmCSbWjm+c8csoin5B18WYul';
        Dynamsoft.WebTwainEnv.RegisterEvent('OnWebTwainReady', onDWTReady);
        Dynamsoft.WebTwainEnv.Load();
    }
 
};

function onDWTReady() {
    DWObject = Dynamsoft.WebTwainEnv.GetWebTwain('dwtcontrolContainer');
}

设置一些参数，比如宽，高，默认的标签：

DWObject.Width = 480;
DWObject.Height = 640;
DWObject.SetDefaultTag('default');

获取USB扫描仪列表：

let count = DWObject.SourceCount;
let select = document.getElementById("source");
 
for (let i = 0; i < count; i++) {
    let source_name = DWObject.GetSourceNameItems(i);
    let option = document.createElement('option');
    option.value = i;
    option.text = source_name;
    select.appendChild(option);
}

为了方便看图，可以改变容器的显示方式：

<select id="view" onchange="onViewChange()">
                    <option value="6">6x6</option>
                    <option value="5">5x5</option>
                    <option value="4">4x4</option>
                    <option value="3">3x3</option>
                    <option value="2">2x2</option>
                    <option value="1">1x1</option>
</select>
 
let view_select = document.getElementById('view');
DWObject.SetViewMode(view_select.value, view_select.value);

在这里插入图片描述

添加扫描仪功能：

function scanImage() {
    if (!DWObject) return;
 
    DWObject.IfDisableSourceAfterAcquire = true;
    let bSelected = DWObject.SelectSource();
 
    if (bSelected) {
        let onSuccess, onFailure;
        onSuccess = onFailure = function () {
            DWObject.CloseSource();
        };
 
        DWObject.OpenSource();
        DWObject.AcquireImage(onSuccess, onFailure);
    }
}

添加本地图片加载功能：

function uploadImage() {
    if (!DWObject) return;
 
    let onSuccess = function () { };
    let onFailure = function (errorCode, errorString) { };
 
    DWObject.IfShowFileDialog = true;
    DWObject.LoadImageEx("", EnumDWT_ImageType.IT_ALL, onSuccess, onFailure);
}

选择图片，添加标签归类：

let count = DWObject.SelectedImagesCount;
let indices = [];
for (let i = 0; i < count; ++i) {
    indices.push(DWObject.GetSelectedImageIndex(i));
}
DWObject.TagImages(indices, tag.value);
DWObject.FilterImagesByTag(tag.value);

在浏览器中运行页面。

在这里插入图片描述

源码

https://github.com/yushulx/web-document-management

来源：https://my.oschina.net/yushulx/blog/3110547

标签

Dynamic Web