How do I check to see how many bytes are left until EOL in Go?

huangapple
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英文:

How do I check to see how many bytes are left until EOL in Go?

问题

假设我有一个像这样的文件：

  1. John
  2. Marcus
  3. Tom

每个字符串都是由用户输入的，因此我不知道它们的大小。
我该如何编写一个函数来检查距离行尾（EOL）还有多少字节？

英文:

Let's say that I have a file like this:

  1. John
  2. Marcus
  3. Tom

Each of the strings are inputted by the user and therefore I do not know the size of them.
How would I make a function that would check how many bytes are left until the EOL?

答案1

得分: 2

也许你只想逐行读取一个纯文本文件？ How do I check to see how many bytes are left until EOL in Go?

names.txt:

  1. John
  2. Marcus
  3. Tom

main.go:

  1. package main
  3. import (
  4. 	"bufio"
  5. 	"fmt"
  6. 	"os"
  7. )
  9. func main() {
  10. 	file, err := os.Open("names.txt")
  11. 	if err != nil {
  12. 		panic(err)
  13. 	}
  14. 	defer file.Close()
  16. 	scanner := bufio.NewScanner(file)
  17. 	for scanner.Scan() {
  18. 		line := scanner.Text()
  19. 		fmt.Println("name:", line)
  20. 		fmt.Println("length:", len(line))
  21. 	}
  22. }

output:

  1. name: John
  2. length: 4
  3. name: Marcus
  4. length: 6
  5. name: Tom
  6. length: 3
英文:

Maybe you just want to read a plain text file line by line? How do I check to see how many bytes are left until EOL in Go?

names.txt:

  1. John
  2. Marcus
  3. Tom

main.go:

  1. package main
  3. import (
  4. 	"bufio"
  5. 	"fmt"
  6. 	"os"
  7. )
  9. func main() {
  10. 	file, err := os.Open("names.txt")
  11. 	if err != nil {
  12. 		panic(err)
  13. 	}
  14. 	defer file.Close()
  16. 	scanner := bufio.NewScanner(file)
  17. 	for scanner.Scan() {
  18. 		line := scanner.Text()
  19. 		fmt.Println("name:", line)
  20. 		fmt.Println("length:", len(line))
  21. 	}
  22. }

output:

  1. name: John
  2. length: 4
  3. name: Marcus
  4. length: 6
  5. name: Tom
  6. length: 3

huangapple
  • 本文由 发表于 2022年7月22日 00:47:00
  • 转载请务必保留本文链接：https://go.coder-hub.com/73069913.html
  • byte
  • go
  • string
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