148 lines
3.8 KiB
JavaScript
148 lines
3.8 KiB
JavaScript
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function getLocalFilePath(path) {
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if (path.indexOf('_www') === 0 || path.indexOf('_doc') === 0 || path.indexOf('_documents') === 0 || path.indexOf('_downloads') === 0) {
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return path
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}
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if (path.indexOf('file://') === 0) {
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return path
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}
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if (path.indexOf('/storage/emulated/0/') === 0) {
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return path
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}
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if (path.indexOf('/') === 0) {
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var localFilePath = plus.io.convertAbsoluteFileSystem(path)
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if (localFilePath !== path) {
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return localFilePath
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} else {
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path = path.substr(1)
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}
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}
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return '_www/' + path
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}
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export function pathToBase64(path) {
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return new Promise(function(resolve, reject) {
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if (typeof window === 'object' && 'document' in window) {
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if (typeof FileReader === 'function') {
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var xhr = new XMLHttpRequest()
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xhr.open('GET', path, true)
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xhr.responseType = 'blob'
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xhr.onload = function() {
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if (this.status === 200) {
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let fileReader = new FileReader()
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fileReader.onload = function(e) {
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resolve(e.target.result)
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}
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fileReader.onerror = reject
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fileReader.readAsDataURL(this.response)
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}
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}
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xhr.onerror = reject
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xhr.send()
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return
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}
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var canvas = document.createElement('canvas')
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var c2x = canvas.getContext('2d')
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var img = new Image
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img.onload = function() {
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canvas.width = img.width
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canvas.height = img.height
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c2x.drawImage(img, 0, 0)
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resolve(canvas.toDataURL())
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canvas.height = canvas.width = 0
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}
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img.onerror = reject
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img.src = path
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return
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}
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if (typeof plus === 'object') {
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plus.io.resolveLocalFileSystemURL(getLocalFilePath(path), function(entry) {
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entry.file(function(file) {
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var fileReader = new plus.io.FileReader()
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fileReader.onload = function(data) {
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resolve(data.target.result)
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}
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fileReader.onerror = function(error) {
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reject(error)
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}
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fileReader.readAsDataURL(file)
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}, function(error) {
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reject(error)
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})
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}, function(error) {
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reject(error)
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})
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return
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}
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if (typeof wx === 'object' && wx.canIUse('getFileSystemManager')) {
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wx.getFileSystemManager().readFile({
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filePath: path,
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encoding: 'base64',
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success: function(res) {
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resolve('data:image/png;base64,' + res.data)
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},
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fail: function(error) {
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reject(error)
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}
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})
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return
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}
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reject(new Error('not support'))
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})
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}
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export function base64ToPath(base64) {
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return new Promise(function(resolve, reject) {
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if (typeof window === 'object' && 'document' in window) {
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base64 = base64.split(',')
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var type = base64[0].match(/:(.*?);/)[1]
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var str = atob(base64[1])
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var n = str.length
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var array = new Uint8Array(n)
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while (n--) {
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array[n] = str.charCodeAt(n)
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}
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return resolve((window.URL || window.webkitURL).createObjectURL(new Blob([array], { type: type })))
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}
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var extName = base64.match(/data\:\S+\/(\S+);/)
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if (extName) {
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extName = extName[1]
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} else {
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reject(new Error('base64 error'))
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}
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var fileName = Date.now() + '.' + extName
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if (typeof plus === 'object') {
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var bitmap = new plus.nativeObj.Bitmap('bitmap' + Date.now())
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bitmap.loadBase64Data(base64, function() {
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var filePath = '_doc/uniapp_temp/' + fileName
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bitmap.save(filePath, {}, function() {
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bitmap.clear()
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resolve(filePath)
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}, function(error) {
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bitmap.clear()
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reject(error)
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})
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}, function(error) {
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bitmap.clear()
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reject(error)
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})
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return
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}
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if (typeof wx === 'object' && wx.canIUse('getFileSystemManager')) {
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var filePath = wx.env.USER_DATA_PATH + '/' + fileName
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wx.getFileSystemManager().writeFile({
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filePath: filePath,
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data: base64.replace(/^data:\S+\/\S+;base64,/, ''),
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encoding: 'base64',
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success: function() {
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resolve(filePath)
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},
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fail: function(error) {
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reject(error)
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}
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})
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return
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}
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reject(new Error('not support'))
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})
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} |