github.com/linapex/ethereum-dpos-chinese@v0.0.0-20190316121959-b78b3a4a1ece/common/hexutil/json_example_test.go (about)

     1  
     2  //<developer>
     3  //    <name>linapex 曹一峰</name>
     4  //    <email>linapex@163.com</email>
     5  //    <wx>superexc</wx>
     6  //    <qqgroup>128148617</qqgroup>
     7  //    <url>https://jsq.ink</url>
     8  //    <role>pku engineer</role>
     9  //    <date>2019-03-16 12:09:32</date>
    10  //</624342609225060352>
    11  
    12  
    13  package hexutil_test
    14  
    15  import (
    16  	"encoding/json"
    17  	"fmt"
    18  
    19  	"github.com/ethereum/go-ethereum/common/hexutil"
    20  )
    21  
    22  type MyType [5]byte
    23  
    24  func (v *MyType) UnmarshalText(input []byte) error {
    25  	return hexutil.UnmarshalFixedText("MyType", input, v[:])
    26  }
    27  
    28  func (v MyType) String() string {
    29  	return hexutil.Bytes(v[:]).String()
    30  }
    31  
    32  func ExampleUnmarshalFixedText() {
    33  	var v1, v2 MyType
    34  	fmt.Println("v1 error:", json.Unmarshal([]byte(`"0x01"`), &v1))
    35  	fmt.Println("v2 error:", json.Unmarshal([]byte(`"0x0101010101"`), &v2))
    36  	fmt.Println("v2:", v2)
    37  //输出：
    38  //v1错误：十六进制字符串的长度为2，MyType需要10
    39  //V2错误：<nIL>
    40  //版本2:0x0101010101
    41  }
    42