github.com/arieschain/arieschain@v0.0.0-20191023063405-37c074544356/common/hexutil/json_example_test.go (about)

     1  package hexutil_test
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  
     7  	"github.com/quickchainproject/quickchain/common/hexutil"
     8  )
     9  
    10  type MyType [5]byte
    11  
    12  func (v *MyType) UnmarshalText(input []byte) error {
    13  	return hexutil.UnmarshalFixedText("MyType", input, v[:])
    14  }
    15  
    16  func (v MyType) String() string {
    17  	return hexutil.Bytes(v[:]).String()
    18  }
    19  
    20  func ExampleUnmarshalFixedText() {
    21  	var v1, v2 MyType
    22  	fmt.Println("v1 error:", json.Unmarshal([]byte(`"0x01"`), &v1))
    23  	fmt.Println("v2 error:", json.Unmarshal([]byte(`"0x0101010101"`), &v2))
    24  	fmt.Println("v2:", v2)
    25  	// Output:
    26  	// v1 error: hex string has length 2, want 10 for MyType
    27  	// v2 error: <nil>
    28  	// v2: 0x0101010101
    29  }