收到錯誤TypeError:ParsebuffermustbeStringorBuffer

我的 nodejs api 專案中出現以下錯誤。它對手機應用程式網址進行網路抓取。

C:\Program Files\GiustiziaCivileAPI-master\code\node_modules\node-expat\lib\node-expat.js:23 return this.parser.parse(buf, isFinal) ^

TypeError: Parser.parse (C:\Program Files\GiustiziaCivileAPI-master\code\node_modules\node-expat\lib\node-expat.js:23:22) 在 Object.module.exports 處的決議緩沖區必須是 String 或 Buffer [as toJson] (C:\Program Files\GiustiziaCivileAPI-master\code\node_modules\xml2json\lib\xml2json.js:172:17) 在 ReadFileContext.callback (C:\Program Files\GiustiziaCivileAPI-master\code\setup_config\ setup_config.js:33:41) 在 FSReqWrap.readFileAfterOpen [as oncomplete] (fs.js:237:13)

這個檔案似乎導致了

//setup_config.js
//This file is responsible for adding the user's token and UUID to the project via both method and API calling
'use strict';

var fs = require('fs');
var xmlParser = require('xml2json');

var user_uuid = "";
var user_token = "";
var user_deviceName = "";
var user_deviceWidth = "";
var user_deviceHeight = "";

//sets the user info into local file vars
async function setUserInfo(uuid, token, deviceName, deviceWidth, deviceHeight){
    if(uuid && (typeof uuid == "string")) user_uuid = uuid;
    if(token && (typeof token == "string")) user_token = token;
    if(deviceName && (typeof token == "string")) user_deviceName = deviceName;
    if(deviceWidth && (typeof token == "string")) user_deviceWidth = deviceWidth;
    if(deviceHeight && (typeof token == "string")) user_deviceHeight = deviceHeight;

    if(user_uuid && user_token && user_deviceName && user_deviceWidth && user_deviceHeight){
        //add this user info to the XML file
        return await saveUserInfoToXML();
    }
}

//try to get the user info from the persisted config XML file and send populate global vars (user_uuid, user_token)
async function retrieveUserInfoFromXML(){
    return new Promise(resolve => {
        fs.readFile('./config/config.xml', "utf8", function(err, data) {
            if(err) resolve(false);
         var jsonOfXML = JSON.parse(xmlParser.toJson(data));
         
                            
            //now populate user info into local var
            user_uuid = jsonOfXML.user_info.uuid;
            user_token = jsonOfXML.user_info.token;

            user_deviceName = jsonOfXML.user_info.deviceName;
            user_deviceWidth = jsonOfXML.user_info.deviceWidth;
            user_deviceHeight = jsonOfXML.user_info.deviceHeight;
            
            resolve(true);
         });
      });
}

//add user info on global vars to the config XML file
async function saveUserInfoToXML(){
    return new Promise(resolve => {
        var xmlFromJSON = xmlParser.toXml("{ \"user_info\": { \"token\": \"" user_token  "\", \"uuid\": \"" user_uuid  "\",  \"deviceName\": \"" user_deviceName  "\",  \"deviceWidth\": \"" user_deviceWidth  "\",  \"deviceHeight\": \"" user_deviceHeight  "\" } }");
        fs.writeFile('./config/config.xml', xmlFromJSON, function(err, data){
            if (err) resolve(false);
            resolve(true);
        });
    });
}

//get the user info inserted by the user (returns a Array containing [User ID, User Token])
function getUserInfo(){
    var errorCode = 0;
    
    if(user_uuid && (typeof user_uuid == "string") == false) errorCode  =1;
    if(user_token && (typeof user_token == "string") == false) errorCode  =1;
    
    if(user_deviceName && (typeof user_deviceName == "string") == false) errorCode  =1;
    if(user_deviceWidth && (typeof user_deviceWidth == "string") == false) errorCode  =1;
    if(user_deviceHeight && (typeof user_deviceHeight == "string") == false) errorCode  =1;

    if(errorCode == 0){
        return [user_uuid, user_token, user_deviceName, user_deviceWidth, user_deviceHeight];
    }else{
        return errorCode;
    }
}

module.exports = {
    setUserInfo, getUserInfo, retrieveUserInfoFromXML
}; 

特別是這些行>如何解決這個問題？

if(err) resolve(false);
         var jsonOfXML = JSON.parse(xmlParser.toJson(data));
    ```

uj5u.com熱心網友回復：

如果出現錯誤，您正在解決承諾，然后繼續運行其余代碼，這是您不應該做的（沒有什么神奇的東西resolve會使其余代碼以某種方式被跳過）。

相反，在解決承諾后回傳（也在saveUserInfoToXML）：

if (err) return resolve(false);
var jsonOfXML = JSON.parse(xmlParser.toJson(data));

標籤：节点.js解析网页抓取xml 到 json

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