github.com/aigarnetwork/aigar@v0.0.0-20191115204914-d59a6eb70f8e/common/hexutil/json_example_test.go (about)

     1  //  Copyright 2018 The go-ethereum Authors
     2  //  Copyright 2019 The go-aigar Authors
     3  //  This file is part of the go-aigar library.
     4  //
     5  //  The go-aigar library is free software: you can redistribute it and/or modify
     6  //  it under the terms of the GNU Lesser General Public License as published by
     7  //  the Free Software Foundation, either version 3 of the License, or
     8  //  (at your option) any later version.
     9  //
    10  //  The go-aigar library is distributed in the hope that it will be useful,
    11  //  but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  //  GNU Lesser General Public License for more details.
    14  //
    15  //  You should have received a copy of the GNU Lesser General Public License
    16  //  along with the go-aigar library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package hexutil_test
    19  
    20  import (
    21  	"encoding/json"
    22  	"fmt"
    23  
    24  	"github.com/AigarNetwork/aigar/common/hexutil"
    25  )
    26  
    27  type MyType [5]byte
    28  
    29  func (v *MyType) UnmarshalText(input []byte) error {
    30  	return hexutil.UnmarshalFixedText("MyType", input, v[:])
    31  }
    32  
    33  func (v MyType) String() string {
    34  	return hexutil.Bytes(v[:]).String()
    35  }
    36  
    37  func ExampleUnmarshalFixedText() {
    38  	var v1, v2 MyType
    39  	fmt.Println("v1 error:", json.Unmarshal([]byte(`"0x01"`), &v1))
    40  	fmt.Println("v2 error:", json.Unmarshal([]byte(`"0x0101010101"`), &v2))
    41  	fmt.Println("v2:", v2)
    42  	// Output:
    43  	// v1 error: hex string has length 2, want 10 for MyType
    44  	// v2 error: <nil>
    45  	// v2: 0x0101010101
    46  }