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                ### 處理錯誤 ``` package main import ( "fmt" "io/ioutil" ) func main() { f, err := ioutil.ReadFile("test.txt") if err != nil { fmt.Println(err) } else { fmt.Println(f) } } 結果: open test.txt: The system cannot find the file specified. ``` ### 自定義錯誤 ``` type error interface{ Error() string } ``` ``` err := errors.New("this is an error") ``` ``` package main import ( "errors" "fmt" ) func main() { err := errors.New("這是錯誤程序") var err2 error fmt.Println(err.Error()) fmt.Println(err2) } 結果: 這是錯誤程序 <nil> ``` ``` package main import ( "fmt" "runtime" ) func main() { if _, _, line, ok := runtime.Caller(0); ok == true { err := fmt.Errorf("錯誤出現在%d行", line) fmt.Println(err.Error()) } } 結果: 錯誤出現在9行 ```
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