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package main | |
import ( | |
"io" | |
"os" | |
) | |
type writeFile struct { | |
f *os.File | |
err error | |
} | |
func newWriteFile(filename string) *writeFile { | |
f, err := os.Create(filename) | |
return &writeFile{ | |
f: f, | |
err: err, | |
} | |
} | |
func (w *writeFile) WriteString(text string) { | |
if w.err != nil { | |
return | |
} | |
_, err := io.WriteString(w.f, text) | |
if err != nil { | |
w.err = err | |
} | |
} | |
func (w *writeFile) Close() { | |
if w.err != nil { | |
return | |
} | |
err := w.f.Close() | |
if err != nil { | |
w.err = err | |
} | |
} | |
func (w *writeFile) Err() error { | |
return w.err | |
} | |
func main() { | |
f := newWriteFile("file.txt") | |
f.WriteString("Hello World") | |
f.WriteString("More Text!") | |
f.Close() | |
err := f.Err() | |
if err != nil { | |
panic(err) | |
} | |
//Avoid checking error after every line, do it after processing like the code above | |
// f, err := os.Create("file.txt") | |
// if err != nil { | |
// panic(err) | |
// } | |
// _, err = io.WriteString(f, "Hello World") | |
// if err != nil { | |
// panic(err) | |
// } | |
// _, err = io.WriteString(f, "More Text!") | |
// if err != nil { | |
// panic(err) | |
// } | |
// err = f.Close() | |
// if err != nil { | |
// panic(err) | |
// } | |
} |
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