Go: (运算符 + 未在 slice 上定义)

Question

我正在尝试编写一个程序来获取用户输入标志，读取包含数据的输入文件 (testInput.txt)，然后将用户的标志 append 到输入数据并将其全部导出到输出文件 (testOutput.txt)。尝试将两者 append 在一起时，我在 func employeeReadWrite() 中遇到错误。 “无效操作:内容 + cnvUserProfile(运算符 + 未在 slice 上定义)”。我是编程的新手，go 是我的第一语言，而且我还没有很好地掌握 slice 。我需要做什么来解决该错误？

package main

import (
"flag"
"fmt"
"io/ioutil"
"os"
)

var targetEmployee *string
var targetUsername *string
var targetLocation *string
var targetDepartment *string
var targetManager *string
var targetTitle *string
var userProfile string

func getFlagVariables() {
    targetEmployee = flag.String("employee", "", "What is there name? (-employee)")
    targetUsername = flag.String("username", "", "What is there username? (-username)")
    targetLocation = flag.String("location", "", "Where are the working from? (-location)")
    targetDepartment = flag.String("department", "", "What is there department? (-department)")
    targetManager = flag.String("manager", "", "Who is there manager? (-manager)")
    targetTitle = flag.String("title", "", "What is there job title? (-title)")

    flag.Parse()

    fmt.Println("-----------------------------------")
    userProfile = *targetEmployee + "\n" + *targetUsername + "\n" + *targetUsername + "@genericCompany.com" + "\n" + *targetLocation + "\n" + *targetDepartment + "\n" + *targetManager + "\n" + *targetTitle
    fmt.Println(userProfile)
    fmt.Println("-----------------------------------")

}

func employeeReadWriteFile() {
    contents, _ := ioutil.ReadFile("testInput.txt")
    cnvrtUserProfile := []byte(userProfile)
    ioutil.WriteFile("testOutput.txt", contents+cnvrtUserProfile, 0x777)
}

Answer 1

您不能在 slice 上使用 +，但是您可以使用 append:

 ioutil.WriteFile("testOutput.txt", append(contents, cnvrtUserProfile), 0x777)