常规错误处理

    1.  var p Point
    2. if err := binary.Read(r, binary.BigEndian, &p.Longitude); err != nil {
    3.     return nil, err
    4. }
    5. if err := binary.Read(r, binary.BigEndian, &p.Latitude); err != nil {
    6.     return nil, err
    7. }
    8. if err := binary.Read(r, binary.BigEndian, &p.Distance); err != nil {
    9.     return nil, err
    10. }
    11. if err := binary.Read(r, binary.BigEndian, &p.ElevationGain); err != nil {
    12.     return nil, err
    13. }
    14. if err := binary.Read(r, binary.BigEndian, &p.ElevationLoss); err != nil {
    15.     return nil, err
    16. }

    参考bufio.Scanner()的错误处理

    1. scanner := bufio.NewScanner(input)
    2. for scanner.Scan() {
    3.     token := scanner.Text()
    4.     // process token
    5. }
    6. if err := scanner.Err(); err != nil {
    7.     // process the error
    8. }

    优化

    1. type Reader struct {
    2.     r   io.Reader
    3.     err error
    4. }
    5. func (r *Reader) read(data interface{}) {
    6.     if r.err == nil {
    7.         r.err = binary.Read(r.r, binary.BigEndian, data)
    8.     }
    9. }
    12. 调用：
    13. var p Point
    14. r := Reader{r: input}
    15. r.read(&p.Longitude)
    16. r.read(&p.Latitude)
    17. r.read(&p.Distance)
    18. r.read(&p.ElevationGain)
    19. r.read(&p.ElevationLoss)
    20. if r.err != nil {
    21.     return nil, r.err
    22. }
    23. return &p, nil

    参考：https://coolshell.cn/articles/21140.html