需要更多关于binary.write错误无效类型xxx的输入或信息

问题描述 投票:1回答:1

我正在尝试将protobuf * Timestamp.timestamp写入二进制文件,我得到的错误是invalid type *Timestamp.timestamp,我试图无济于事,有人能指点我某个方向吗?谢谢!

    package main

    import (
        "bytes"
        "encoding/binary"
        "fmt"
        google_protobuf "github.com/golang/protobuf/ptypes/timestamp"
        "time"
    )

    func main() {
        buff := new(bytes.Buffer)

        ts := &google_protobuf.Timestamp{
            Seconds: time.Now().Unix(),
            Nanos:   0,
        }

        err := binary.Write(buff, binary.LittleEndian, ts)

        if err != nil {
            panic(err)
        }
        fmt.Println("done")
    }
go
1个回答
1
投票

任何人都能指出我的方向吗?


阅读错误消息。

binary.Write: invalid type *timestamp.Timestamp

阅读binary.Writetimestamp.Timestamp的文档。

Package binary

import "encoding/binary"

func Write

func Write(w io.Writer, order ByteOrder, data interface{}) error

Write将数据的二进制表示写入w。数据必须是固定大小的值或固定大小值的片段,或指向此类数据的指针。布尔值编码为一个字节:1表示true,0表示false。写入w的字节使用指定的字节顺序进行编码,并从数据的连续字段中读取。编写结构时,为具有空白(_)字段名称的字段写入零值。

package timestamp

import "github.com/golang/protobuf/ptypes/timestamp" 

type Timestamp

type Timestamp struct {
    // Represents seconds of UTC time since Unix epoch
    // 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
    // 9999-12-31T23:59:59Z inclusive.
    Seconds int64 `protobuf:"varint,1,opt,name=seconds,proto3" json:"seconds,omitempty"`
    // Non-negative fractions of a second at nanosecond resolution. Negative
    // second values with fractions must still have non-negative nanos values
    // that count forward in time. Must be from 0 to 999,999,999
    // inclusive.
    Nanos                int32    `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
    XXX_NoUnkeyedLiteral struct{} `json:"-"`
    XXX_unrecognized     []byte   `json:"-"`
    XXX_sizecache        int32    `json:"-"`
}

时间戳表示独立于任何时区或日历的时间点,表示为UTC时间段内纳秒分辨率的秒和分数秒。它使用Proleptic Gregorian Calendar进行编码,将公历向后延伸至第一年。它被编码,假设所有分钟都是60秒长,即闰秒被“模糊”,因此解释时不需要闰秒表。范围是从0001-01-01T00:00:00Z到9999-12-31T23:59:59.999999999Z。通过限制到该范围,我们确保可以转换为RFC 3339日期字符串和从RFC 3339日期字符串转换。见https://www.ietf.org/rfc/rfc3339.txt


正如错误消息所示:*timestamp.Timestamp不是固定大小的值或固定大小值的片段,或指向此类数据的指针。

为了确认这一点,请注释掉XXX_unrecognized可变大小的字段;没有错误。

package main

import (
    "bytes"
    "encoding/binary"
    "fmt"
    "time"
)

// https://github.com/golang/protobuf/blob/master/ptypes/timestamp/timestamp.pb.go
type Timestamp struct {
    // Represents seconds of UTC time since Unix epoch
    // 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
    // 9999-12-31T23:59:59Z inclusive.
    Seconds int64 `protobuf:"varint,1,opt,name=seconds,proto3" json:"seconds,omitempty"`
    // Non-negative fractions of a second at nanosecond resolution. Negative
    // second values with fractions must still have non-negative nanos values
    // that count forward in time. Must be from 0 to 999,999,999
    // inclusive.
    Nanos                int32    `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
    XXX_NoUnkeyedLiteral struct{} `json:"-"`
    // XXX_unrecognized     []byte   `json:"-"`
    XXX_sizecache        int32    `json:"-"`
}

func main() {
    buff := new(bytes.Buffer)

    ts := &Timestamp{
        Seconds: time.Now().Unix(),
        Nanos:   0,
    }

    err := binary.Write(buff, binary.LittleEndian, ts)

    if err != nil {
        panic(err)
    }
    fmt.Println("done")
}

游乐场:https://play.golang.org/p/Q5NGnO49Dsc

输出:

done
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