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!
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- doujia1939 2014-09-02 00:32关注
Something like this?
package main import ( "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 := 0 scanner := 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) }
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