5.自定义error
最后更新于：2022-04-02 04:44:32
自定义error：
~~~
package main
import (
"fmt"
"os"
"time"
)
type PathError struct {
path string
op string
createTime string
message string
}
func (p *PathError) Error() string {
return fmt.Sprintf("path=%s \nop=%s \ncreateTime=%s \nmessage=%s", p.path,
p.op, p.createTime, p.message)
}
func Open(filename string) error {
file, err := os.Open(filename)
if err != nil {
return &PathError{
path: filename,
op: "read",
message: err.Error(),
createTime: fmt.Sprintf("%v", time.Now()),
}
}
defer file.Close()
return nil
}
func main() {
err := Open("/Users/***/Desktop/go/src/test.txt")
switch v := err.(type) {
case *PathError:
fmt.Println("get path error,", v)
default:
}
}
~~~
输出结果：
~~~
get path error, path=/Users/***/Desktop/go/src/test.txt
op=read
createTime=2018-04-05 11:25:17.331915 +0800 CST m=+0.000441790
message=open /Users/***/Desktop/go/src/test.txt: no such file or directory
~~~
';