英文:
Unable to create folder on Windows
问题
我正在尝试在Windows上创建一个文件夹，但一直遇到错误，不明白原因。
代码片段如下：
reader := bufio.NewReader(os.Stdin)
fmt.Print("主机名：")
hostname, _ := reader.ReadString('\n')
now := time.Now().Format("20060102150405")
var folderName string = fmt.Sprintf("%s_%s", now, hostname)
err := os.Mkdir(folderName, os.ModePerm)
if err != nil {
log.Fatal(err)
}
错误信息（从荷兰语翻译过来）：
2022/06/10 13:37:13 mkdir 20220610133713_TEST
：文件名、文件夹名或卷名的语法不正确。
退出状态 1
我尝试使用带有\\的完整路径和相对路径.\或.\\。
我通过下面的代码绕过了错误，但这不是正确的方法... 
cmd := exec.Command("cmd.exe", "/C", fmt.Sprintf("mkdir %s", folderName))
err := cmd.Run()
问题可能很明显，但我没有找到原因。也许是Windows特定的问题？
无论如何，感谢你的帮助。
英文:
I'm trying to create a folder on Windows but keep getting an error and do not understand why.
The code snippet:
reader := bufio.NewReader(os.Stdin)
fmt.Print("Hostname: ")
hostname, _ := reader.ReadString('\n')
now := time.Now().Format("20060102150405")
var folderName string = fmt.Sprintf("%s_%s", now, hostname)
err := os.Mkdir(folderName, os.ModePerm)
if err != nil {
log.Fatal(err)
}
The error (translated from Dutch):
2022/06/10 13:37:13 mkdir 20220610133713_TEST
: The syntax of the file name, folder name or volume name is incorrect.
exit status 1
I tried using the full path with \\ and a relative path .\ or .\\
I got around the error with the code below, but that's not the way to go...
cmd := exec.Command("cmd.exe", "/C", fmt.Sprintf("mkdir %s", folderName))
err := cmd.Run()
The issues is probably obvious but I fail to see the reason. Maybe something Windows specific?
Anyway thanks for having a look.
答案1
得分: 3
Reader.ReadString() 的文档说明如下：
> ReadString 会读取输入直到第一个分隔符（delim）的出现，并返回包含数据和分隔符在内的字符串。
Reader.ReadString('\n') 不会去除换行符，返回的字符串将包含一个尾部的\n字符。
你可以像这样打印它来查看：
fmt.Printf("%q\n", folderName)
这将输出（在Go Playground上尝试）：
"20091110230000_TEST\n"
而在 Windows 中，文件夹名称不允许包含换行符。
解决方案是使用bufio.Scanner。
例如：
scanner := bufio.NewScanner(strings.NewReader("TEST\n"))
if !scanner.Scan() {
return // 没有输入
}
hostname := scanner.Text()
now := time.Now().Format("20060102150405")
var folderName string = fmt.Sprintf("%s_%s", now, hostname)
fmt.Printf("%q\n", folderName)
这将输出（在Go Playground上尝试）：
"20091110230000_TEST"
英文:
Reader.ReadString() documents that:
> ReadString reads until the first occurrence of delim in the input, returning a string containing the data up to and including the delimiter.
Reader.ReadString('\n') does not trim the newline character, the returned string will contain a trailing \n character.
You can see it if you print it like this:
fmt.Printf("%q\n", folderName)
This will output (try it on the Go Playground):
"20091110230000_TEST\n"
And Windows does not allow the newline character in folder names.
Solution: use bufio.Scanner.
For example:
scanner := bufio.NewScanner(strings.NewReader("TEST\n"))
if !scanner.Scan() {
return // No input
}
hostname := scanner.Text()
now := time.Now().Format("20060102150405")
var folderName string = fmt.Sprintf("%s_%s", now, hostname)
fmt.Printf("%q\n", folderName)
This will output (try it on the Go Playground):
"20091110230000_TEST"
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