Table of contents:
Convert uni-app pictures to base64 and vice versa
Select an image from your mobile phone to convert to base64:
getToBase64(){
wx.chooseImage({
count:'1', // 最多可以选择的图片张数
sizeType: ['original', 'compressed'], // ['原图','压缩图']
sourceType: ['album', 'camera'], // ['从相册选图','使用相机']
success: res => {
wx.getFileSystemManager().readFile({
filePath: res.tempFilePaths[0], //选择图片返回的相对路径
encoding: 'base64', //编码格式
success: res => {
//成功的回调
console.log('data:image/png;base64,' + res.data)
}
})
}
})
},
Convert online images to base64 or hexadecimal:
getToBase64Two(){
var httpsimg = 'https://baidu.com/a.jpg' // 网络图片地址
wx.downloadFile({
// 需要先下载
url: httpsimg,
success(res) {
console.log(res,'res')
wx.getFileSystemManager().readFile({
filePath: res.tempFilePath, //选择图片返回的相对路径
encoding: 'base64', //编码格式：base64 | hex(16进制)
success: res => {
//成功的回调
let userImageBase64 = 'data:image/jpg;base64,' + res.data;
console.log(userImageBase64); // 打印base64格式图片
}
})
}
})
},
Convert base64 image to local image:
getToLocal(){
var base64data = ""; // base64
const fsm = wx.getFileSystemManager();
const FILE_BASE_NAME = 'tmp_base64src'; //自定义文件名
const [, format, bodyData] = /data:image\/(\w+);base64,(.*)/.exec(base64data) || [];
if (!format) {
return (new Error('ERROR_BASE64SRC_PARSE'));
}
const filePath = `${
wx.env.USER_DATA_PATH}/${
FILE_BASE_NAME}.${
format}`;
const buffer = wx.base64ToArrayBuffer(bodyData);
fsm.writeFile({
filePath,
data: buffer,
encoding: 'binary',
success(r) {
console.log(r,'r')
console.log(filePath,'filePath')
},
fail() {
return (new Error('ERROR_BASE64SRC_WRITE'));
},
});
},
The above code is for reference only, and the specific implementation details and styles can be adjusted according to needs.
How to obtain source code:
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