微信小程序 开发中的问题(simba_wx)

需要先下载 protobufjs-cli 依赖

npm i -D protobufjs-cli

然后再当前目录下的终端，执行以下命令

npx pbjs -t json proto/test.proto > proto/test.json

proto/test.proto > proto/test.json ：意思是找到当前目录的 proto 文件夹下的 test.proto 文件，将该文件转为 test.json 并将该文件放到 proto 文件夹下

npm i -S protobufjs

由于收到数据是二进制的，虽然拿到的 proto 文件的 json 结构，但这还是不能直接使用，还需要下转 protobufjs 依赖，将收到的二进制数据根据 test.json 文件转成对应的 json 结构

import protobuf from "protobufjs";
import protoJson from "./proto/test.json";
​
// 使用 protobufjs 拿到 test.json 的 json 结构
const root = protobuf.Root.fromJSON(protoJson);
// 找到要翻译的包和字段
const protoData = root.lookupType("interface_message.GeneralDetectionMapData");
​
// data是收到二进制数据，使用 decode 方法，将二进制数据根据【包和字段】转成 json 结构的数据，该过程简称：解密
const data = protoData.decode(data);
​
// 当需要发送修改过后的 proto 数据发送给后端时，使用 encode 可将数据转成 proto 结构的数据，该过程简称：加密
const protoData = protoData.encode(data).finish()

例如：

const serverUrl = 'http://192.168.200.200:7081';var protobuf = require('@/weichatPb/protobuf.js');
const awesomeConfig = require('@/proto/order.js');
var AwesomeRoot = protobuf.Root.fromJSON(awesomeConfig);// 错误结果
var ErrorRequest = AwesomeRoot.lookupType("ErrorMessage");
// 结果sucess
var OperationGeneralResp = AwesomeRoot.lookupType("OperationGeneralResp");// 获取验证码
var VerificationCodeResp = AwesomeRoot.lookupType("VerifyCodeMessage"); // 获取验证码结果// 登录
var SignInRes = AwesomeRoot.lookupType("UserLogInRequest"); // 登录传值
var SignInResp = AwesomeRoot.lookupType("LoginResp"); // 登录结果// 获取初始信息 --> 1：销售  2：商务
var AuthorInitRes = AwesomeRoot.lookupType("AuthorizationFileTicketInitReq"); // 传值
var AuthorInitResp = AwesomeRoot.lookupType("AuthorizationFileTicketInitResp"); // 结果// 查询授权工单
var SearchAuthorRes = AwesomeRoot.lookupType("GetAuthorizationFileTicketReq"); // 传值
var SearchAuthorResp = AwesomeRoot.lookupType("SalesGetAuthorizationFileTicketResp"); // 结果// 新建授权工单
var AddAuthorRes = AwesomeRoot.lookupType("AddAuthorizationFileTicketReq"); // 传值// 关闭工单
var DelRes = AwesomeRoot.lookupType("CloseAuthorizationFileTicketReq"); // 传值// 修改工单
var UpdateRes = AwesomeRoot.lookupType("EditAuthorizationFileTicketReq"); // 传值// 审核工单
var ProcessRes = AwesomeRoot.lookupType("AuditAuthorizationFileTicketReq"); // 传值// 下载附件
var AnnexRes = AwesomeRoot.lookupType("DeleteAuthFileAttachmentReq"); // 传值// 上传附件
var UpAnnexRes = AwesomeRoot.lookupType("AddAuthFileAttachmentReq"); // 传值const timeout = 15000;
export class Api {// 公共发送请求体static _request(url, requestBuffer, resMode) {var promise = new Promise((resolve, reject) => {var that = this;uni.request({url: serverUrl + url,method: "POST",dataType: 'protobuf',data: requestBuffer,responseType: "arraybuffer",timeout: timeout,header: {"X-Requested-With": "XMLHttpRequest","Content-Type": "application/octet-stream",},success(res) {if (res.statusCode == 200) {var deMessage = resMode.decode(res.data);} else {var deMessage = ErrorRequest.decode(res.data);}resolve(deMessage);},error: function (e) {reject("网络出错");console.log("网络出错")}});});return promise;}// 序列化数据static getUnit8Data(Message, payload) {var message = Message.create(payload);var buffer = Message.encode(message).finish();var requestBuffer = new Uint8Array([...buffer]).buffer;return requestBuffer}// 获取初始信息static async getAuthInit(payload) {var url = "/AuthorizationFileTicketInit";var requestBuffer = Api.getUnit8Data(AuthorInitRes, payload)const res = await Api._request(url, requestBuffer, AuthorInitResp);console.log(res)return res;}// 新建授权工单static async setAuthData(payload) {var url = "/AddAuthorizationFileTicket";var requestBuffer = Api.getUnit8Data(AddAuthorRes, payload)const res = await Api._request(url, requestBuffer, OperationGeneralResp);console.log(res)return res;}// 查询授权工单static async getAuthData(payload) {var url = "/GetAuthorizationFileTicket";var requestBuffer = Api.getUnit8Data(SearchAuthorRes, payload)const res = await Api._request(url, requestBuffer, SearchAuthorResp);console.log(res)return res;}// 关闭工单static async getDel(payload) {var url = "/CloseAuthorizationFileTicket";var requestBuffer = Api.getUnit8Data(DelRes, payload)const res = await Api._request(url, requestBuffer, OperationGeneralResp);console.log(res)return res;}// 修改工单static async getUpdate(payload) {var url = "/EditAuthorizationFileTicket";var requestBuffer = Api.getUnit8Data(UpdateRes, payload)const res = await Api._request(url, requestBuffer, OperationGeneralResp);console.log(res)return res;}// 审核工单static async getProcess(payload) {var url = "/AuditAuthorizationFileTicket";var requestBuffer = Api.getUnit8Data(ProcessRes, payload)const res = await Api._request(url, requestBuffer, OperationGeneralResp);console.log(res)return res;}// 删除附件static async getAnnex(payload) {var url = "/DeleteAuthFileAttachment";var requestBuffer = Api.getUnit8Data(AnnexRes, payload)const res = await Api._request(url, requestBuffer, OperationGeneralResp);console.log(res)return res;}// 上传附件static async getUpAnnex(payload) {var url = "/AddAuthFileAttachment";var requestBuffer = Api.getUnit8Data(UpAnnexRes, payload)const res = await Api._request(url, requestBuffer, OperationGeneralResp);console.log(res)return res;}// 获取验证码static async getVerificationCode() {let payload = {}var url = "/GenerateVerificationCode";var requestBuffer = Api.getUnit8Data(AuthorInitRes, payload)const res = await Api._request(url, requestBuffer, VerificationCodeResp);return res;}// 登录static async getSignIn(payload) {var url = "/UserLogin";var requestBuffer = Api.getUnit8Data(SignInRes, payload)const res = await Api._request(url, requestBuffer, SignInResp);return res;}
}

微信小程序 JS 字符串string与utf8编码的arraybuffer的相互转换

&#8194最近在做一个微信小程序，和后端用websocket连接，后端要求传输过去的信息是UTF8编码的二进制信息。JS并没有可以直接进行转换的库函数，因此必须自己写一个编码以及解析的函数。
    最开始采用了一个字符一个字符的charCodeAt,但是通过这种方式可以传输非中文的内容，有中文时则无法正确的转换。
    后来参考了网上的一些资料，通过先将字符串编码并转换为byte[],再转换为对应的arraybuffer（解析同理，先将arraybuffer转换为byte[]，再进行解码）
    编码及解码的过程较复杂，不过这两个函数是可以直接使用的，同时支持中文和英文。
    
字符串内容转arraybuffer

stringToArrayBuffer(str) {var bytes = new Array();var len, c;len = str.length;for (var i = 0; i < len; i++) {c = str.charCodeAt(i);if (c >= 0x010000 && c <= 0x10ffff) {bytes.push(((c >> 18) & 0x07) | 0xf0);bytes.push(((c >> 12) & 0x3f) | 0x80);bytes.push(((c >> 6) & 0x3f) | 0x80);bytes.push((c & 0x3f) | 0x80);} else if (c >= 0x000800 && c <= 0x00ffff) {bytes.push(((c >> 12) & 0x0f) | 0xe0);bytes.push(((c >> 6) & 0x3f) | 0x80);bytes.push((c & 0x3f) | 0x80);} else if (c >= 0x000080 && c <= 0x0007ff) {bytes.push(((c >> 6) & 0x1f) | 0xc0);bytes.push((c & 0x3f) | 0x80);} else {bytes.push(c & 0xff);}}var array = new Int8Array(bytes.length);for (var i in bytes) {array[i] = bytes[i];}return array.buffer;},

arraybuffer转字符串内容

function arrayBufferToString(arr){if(typeof arr === 'string') {  return arr;  }  var dataview=new DataView(arr.data);var ints=new Uint8Array(arr.data.byteLength);for(var i=0;i<ints.length;i++){ints[i]=dataview.getUint8(i);}arr=ints;var str = '',  _arr = arr;  for(var i = 0; i < _arr.length; i++) {  var one = _arr[i].toString(2),  v = one.match(/^1+?(?=0)/);  if(v && one.length == 8) {  var bytesLength = v[0].length;  var store = _arr[i].toString(2).slice(7 - bytesLength);  for(var st = 1; st < bytesLength; st++) {  store += _arr[st + i].toString(2).slice(2);  }  str += String.fromCharCode(parseInt(store, 2));  i += bytesLength - 1;  } else {  str += String.fromCharCode(_arr[i]);  }  }  return str; 
}