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49 lines
598 B
Go
49 lines
598 B
Go
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package main
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import (
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"fmt"
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"io"
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"log"
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"os"
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)
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func NewWriter(w io.Writer) *writer {
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return &writer{w, nil}
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}
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type writer struct {
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w io.Writer
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err error
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}
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func (w *writer) write(text string) {
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if w.err != nil {
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return
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}
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_, w.err = fmt.Fprintln(w.w, text)
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}
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func (w *writer) Err() error {
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return w.err
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}
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func main() {
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f, err := os.OpenFile("test.txt", os.O_WRONLY, os.ModePerm)
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if err != nil {
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log.Fatal(err)
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}
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defer f.Close()
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w := NewWriter(f)
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w.write("Hello world 3")
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w.write("Hello world 3")
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if err = w.Err(); err != nil {
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log.Fatal(err)
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}
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fmt.Println(f)
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}
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