获取path
uni.chooseMedia({ count:1, success(res){ let path = res.tempFiles[0].tempFilePath; // Android content:// 先转成本地可上传地址 if(path.startsWith('content://')){ path = plus.io.convertLocalFileSystemURL(path); } //获得path } });获取base64
function convertLocalPathToBlob(path) { return new Promise((resolve, reject) => { uni.saveFile({ tempFilePath: path, // 临时文件路 success(res) { const savedFilePath = res.savedFilePath; // 保存后的文件路径 plus.io.resolveLocalFileSystemURL(savedFilePath, (entry) => { console.log("准备读取文件"); console.log("entry", entry); entry.file((file) => { console.log("进入entry", file); const absolutePath = entry.fullPath; const reader = new plus.io.FileReader(); reader.onloadend = (e) => { //console.log("读取文件成功", e.target.result); resolve(e.target.result); }; reader.onerror = (err) => { console.log("读取文件失败", err); reject(err); }; reader.onprogress = function(event) { console.log("读取进度：", event.loaded, event.total); }; reader.readAsDataURL(file); //只能读出来base64 // reader.readAsArrayBuffer(absolutePath); //这里二进制死活读不出来 console.log("reader", reader); console.log("进入entry结束", reader); }); }, (err) => { console.log("准备读取文件失败", err); reject(err); }); } }) }) }base64转二进制
const arrayBuffer = uni.base64ToArrayBuffer(dataURL.split(',')[1]);或
// base64转二进制 function dataURLtoArrayBuffer(dataURL) { const base64 = dataURL.split(',')[1]; const binaryString = atob(base64); const len = binaryString.length; const bytes = new Uint8Array(len); for (let i = 0; i < len; i++) { bytes[i] = binaryString.charCodeAt(i); } return bytes.buffer; }注意
const xhr = new plus.net.XMLHttpRequest(); xhr.open('PUT', resa.uploadUrl, true); xhr.mimeType = fileType || 'application/octet-stream'; xhr.responseType = 'arraybuffer'; // 监听数据接收进度 xhr.onprogress = function(event) { console.log('event',event) if (event.lengthComputable) { const percent = (event.loaded / event.total) * 100; console.log('上传进度:', percent + '%'); } }; const binaryString = arrayBufferToString(arrayBuffer); xhr.setRequestHeader('Content-Type', 'image/jpeg' ); xhr.send(binaryString);//plus.net.XMLHttpRequest 只能上传文本,不能上传二进制 这里卡了好久function saveImage(ab, fileName) { return new Promise((resolve, reject) => { // 1. 先申请存储权限（Android 10+ 必须） plus.android.requestPermissions(['android.permission.WRITE_EXTERNAL_STORAGE'], () => { // 2. 创建写入目录 const dir = '_doc/'; // 也可换 '_downloads/' 等 plus.io.requestFileSystem(plus.io.PRIVATE_DOC, fs => { fs.root.getDirectory(dir, { create: true }, dirEntry => { // 3. 创建空文件 console.log(111); dirEntry.getFile(fileName, { create: true }, fileEntry => { // 4. 写入 ArrayBuffer fileEntry.createWriter(writer => { console.log(222); writer.onwrite = () => resolve(fileEntry.fullPath); // 写盘完成 writer.onerror = e => {console.error('Writer 错误:', e);reject(e);} console.log(333); //const blob = new Blob([ab], { type: 'image/jpeg' }); writer.write(blob);//uniapp 这里保存二进制,每次保存都是文件可以创建,但是大小只有0B,查询说也是只可以保存文本,不能保存二进制 console.log(444);// 直接写 ArrayBuffer }, reject); }, reject); }, reject); }, reject); }, reject); }); }本来想用 plus.net.XMLHttpRequest() 直接上传二进制文件,但是不能发送二进制,后来有试了renderjs 中的XMLHttpRequest ,测试可以上传,请看我其他文章
