英文:
Go: Reading a specific range of lines in a file
问题
我主要需要读取文件中的特定行范围，如果一个字符串与索引字符串匹配（比如说"Hello World!"），则返回true，但我不确定如何实现。我知道如何读取单独的行和整个文件，但不知道如何读取行范围。是否有任何可以帮助的库，或者有没有简单的脚本可以实现？非常感谢您的帮助！
英文:
I mainly need to read a specific range of lines in a file, and if a string is matched to an index string (let's say "Hello World!" for example) return true, but I'm not sure how to do so. I know how read individual lines and whole files, but not ranges of lines. Are there any libraries out there that can assist, or there a simple script to do it w/? Any help is greatly appreciated!
答案1
得分: 8
像这样吗？
package mainimport ("bufio""bytes""fmt""os")func Find(fname string, from, to int, needle []byte) (bool, error) {f, err := os.Open(fname)if err != nil {return false, err}defer f.Close()n := 0scanner := bufio.NewScanner(f)for scanner.Scan() {n++if n < from {continue}if n > to {break}if bytes.Index(scanner.Bytes(), needle) >= 0 {return true, nil}}return false, scanner.Err()}func main() {found, err := Find("test.file", 18, 27, []byte("Hello World"))fmt.Println(found, err)}
英文:
Something like this?
package mainimport ("bufio""bytes""fmt""os")func Find(fname string, from, to int, needle []byte) (bool, error) {f, err := os.Open(fname)if err != nil {return false, err}defer f.Close()n := 0scanner := bufio.NewScanner(f)for scanner.Scan() {n++if n < from {continue}if n > to {break}if bytes.Index(scanner.Bytes(), needle) >= 0 {return true, nil}}return false, scanner.Err()}func main() {found, err := Find("test.file", 18, 27, []byte("Hello World"))fmt.Println(found, err)}
答案2
得分: -1
如果你正在使用for循环来遍历一段行的切片，你可以使用以下类似的代码：
for _, line := range file[2:40] {// 做一些操作}
英文:
If you're using for to iterate through a slice of lines, you could use something along the lines of
for _,line := range file[2:40] {// do stuff}
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