tulkdan.dev
+40
Go/input/file-seek.go
+40
Go/input/file-seek.go
···
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package main
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import (
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"fmt"
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"os"
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)
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func main() {
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tmp := os.TempDir()
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file, err := os.Create(tmp + "/myfile")
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if err != nil {
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panic(err)
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}
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defer file.Close()
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msg := "Save the world with Go!"
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_, err = file.WriteString(msg)
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if err != nil {
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panic(err)
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}
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positions := []int{4, 10, 20}
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for _, i := range positions {
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_, err := file.Seek(int64(i), 0)
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if err != nil {
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panic(err)
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}
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file.Write([]byte("X"))
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}
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file.Seek(0, 0)
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result := make([]byte, len(msg))
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if _, err := file.Read(result); err != nil {
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panic(err)
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}
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fmt.Printf("%s\n", result)
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}