91 lines
2.7 KiB
JavaScript
91 lines
2.7 KiB
JavaScript
const FileUtil = {
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//file 为微信file 单文件
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getFileName(file){
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// size: 132224
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// thumb: "http://tmp/0ftStiYfd18K517836423bbfde024c385140a666b344.png"
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// type: "image"
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// url: "http://tmp/0ftStiYfd18K517836423bbfde024c385140a666b344.png"
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if(file){
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const uuid = this.UUID().replace("/-/g","");
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if(file.url && (file.url.indexOf(".") > -1)){
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const fileType = file.url.split(".")[1];
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return uuid+"."+fileType;
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}else{
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return;
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}
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}
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return;
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},
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UUID () {
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if (typeof crypto === 'object') {
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if (typeof crypto.randomUUID === 'function') {
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return crypto.randomUUID();
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}
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if (typeof crypto.getRandomValues === 'function' && typeof Uint8Array === 'function') {
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const callback = (c) => {
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const num = Number(c);
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return (num ^ (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (num / 4)))).toString(16);
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};
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return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, callback);
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}
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}
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let timestamp = new Date().getTime();
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let perforNow = (typeof performance !== 'undefined' && performance.now && performance.now() * 1000) || 0;
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return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
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let random = Math.random() * 16;
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if (timestamp > 0) {
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random = (timestamp + random) % 16 | 0;
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timestamp = Math.floor(timestamp / 16);
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} else {
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random = (perforNow + random) % 16 | 0;
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perforNow = Math.floor(perforNow / 16);
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}
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return (c === 'x' ? random : (random & 0x3) | 0x8).toString(16);
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});
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},
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canvasToFile(){
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let canvas = window.map3DControl.viewer.canvas;
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let imgWidth = 1920;
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let img = Canvas2Image.convertToImage(
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canvas,
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imgWidth,
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(imgWidth * canvas.height) / canvas.width,
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"png"
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);
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let file_name = new Date().getTime() + ".png";
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let imgsrc = img.src.slice(22)
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let file = this.convertBase64UrlToImgFile(
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imgsrc,
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file_name,
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"image/png"
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)
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return file;
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},
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convertBase64UrlToImgFile(urlData, fileName, fileType) {
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urlData = urlData.replace(/^data:image\/\w+;base64,/, "");
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let bytes = wx.base64ToArrayBuffer(urlData);
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// var bytes = wx.atob(urlData); //转换为byte
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//处理异常,将ascii码小于0的转换为大于0
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var ab = new ArrayBuffer(bytes.length);
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var ia = new Int8Array(ab);
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var i;
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for (i = 0; i < bytes.length; i++) {
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ia[i] = bytes.charCodeAt(i);
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}
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//转换成文件，添加文件的type，name，lastModifiedDate属性
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var blob = new Blob([ab], { type: fileType });
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blob.lastModifiedDate = new Date();
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blob.name = fileName;
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return blob;
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}
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}
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export { FileUtil } |