索引超出范围 [1]，长度为0。

huangapple
go评论150阅读模式
英文:

Index out of range [1] with length 0

问题

我正在使用Go语言编写一个小型MUD游戏，并尝试从文件中读取一系列带有出口的房间。

我期望代码能够遍历文件的每一行，将索引为1的行填充到房间ID中，将索引为2的行填充到房间描述中，将索引为3的行填充到房间的链接中。然而，当我运行代码时，出现了一个错误：panic: runtime error: index out of range [1] with length 0。我已经思考了两天，但没有找到解决办法，希望能得到帮助。

编辑：我尝试使用r:= []*Room{}来初始化r，但仍然遇到相同的错误。

  1. func roomsInit() ([]*Room, error) {
  2. 	r := []*Room{}
  3. 	roomdoc, err := readLines("/usr/go/src/gopherit/GopherIT/roomdoc.txt")
  4. 	if err != nil {
  5. 		return r, err
  6. 	}
  7. 	i := 0
  8. 	index := 1
  9. 	for _, str := range roomdoc {
  10. 		if i == 0 {
  11. 			r[index].roomInitId(str)
  12. 			i++
  13. 		}
  14. 		if i == 1 {
  15. 			r[index].roomInitDesc(str)
  16. 			i++
  17. 		}
  18. 		if i == 2 {
  19. 			vri := strings.Split(str, ":")
  20. 			v, ri := vri[0], vri[1]
  21. 			r[index].addLink(v, ri)
  22. 			i++
  23. 		}
  24. 		if i == 3 {
  25. 			index++
  26. 			i = 0
  27. 		}
  28. 	}
  29. 	return r, err
  30. }
英文:

I'm working ona little MUD in Go, and I'm trying to read a list of rooms with exits from a file.
I expect the code to iterate through the lines of the file, filing every line with the index 1 to the room ID, every line with the index 2 to the room Description and every line wit the index 3 to be used to fill in the room's links. However when I run the code, i get a panic: runtime error: indext out of range[1] with length 0. I've been mulling over this for two days with no luck, any help would be mucho appreciado.

Edit: tried initializing r with r:= []*Room{} but am still getting the same error.

  1. 	r:= []*Room{}
  2. 	roomdoc, err := readLines("/usr/go/src/gopherit/GopherIT/roomdoc.txt")
  3. 	if err != nil {
  4. 		return r, err
  5. 	}
  6. 	i := 0
  7. 	index := 1
  8. 	for _, str := range roomdoc {
  9. 		if i == 0 {
  10. 			r[index].roomInitId(str)
  11. 			i++
  12. 		}
  13. 		if i == 1 {
  14. 			r[index].roomInitDesc(str)
  15. 			i++
  16. 		}
  17. 		if i == 2 {
  18. 			vri := strings.Split(str, ":")
  19. 			v, ri := vri[0], vri[1]
  20. 			r[index].addLink(v, ri)
  21. 			i++
  22. 		}
  23. 		if i == 3 {
  24. 			index++
  25. 			i = 0
  26. 		}
  28. 	}
  29. 	return r, err
  30. }
  32. </details>
  35. # 答案1
  36. **得分**: 0
  38. 你正在做的是"嘿，创建一个名为r的变量，它是Room结构体指针的切片"，即r:= []*Room{}，然后在for循环中使用它，基本上是试图访问在该上下文中不存在的内存位置。
  40. 所以你需要将元素追加到该切片中，像这样：```r = append(r, &Room{})```
  42. <details>
  43. <summary>英文:</summary>
  45. What are you doing is &quot;Hey go make a variable r that is a slice of pointers from the Room Struct&quot; r:= []*Room{}&quot; and then using on the For, so is basic trying to access a position in memory that doesn&#39;t exist in that context. 
  47. So you need to append into that slice, like ``` r = append(r,&amp;Room{})```  
  49. </details>

huangapple
  • 本文由 发表于 2021年8月2日 01:52:07
  • 转载请务必保留本文链接：https://go.coder-hub.com/68613015.html
  • arrays
  • go
  • indexing
  • iteration
  • runtime-error
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