示列合约
https://github.com/galen-bin/remix/blob/master/mytoken.sol
abi json 可以输出一下
golang 设置变量读取示列
client, err := ethclient.Dial(adres)
if err != nil {
log.Fatal(err)
}
contractAddr := "0x合约地址"
// 准备交易数据
json_api, err := os.ReadFile("./api.json")
if err != nil {
fmt.Println("读取文件失败:", err)
return
}
contractABI, err := abi.JSON(strings.NewReader(string(json_api)))
if err != nil {
log.Fatal(err)
}
privateKey, err := crypto.HexToECDSA("秘钥")
if err != nil {
log.Fatal(err)
}
// 获取公钥地址
publicKey := privateKey.Public()
publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
if !ok {
log.Fatal("error casting public key to ECDSA")
}
fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)
// 获取 nonce
nonce, err := client.PendingNonceAt(context.Background(), fromAddress)
if err != nil {
log.Fatal(err)
}
// 估算 gas 价格
gasPrice, err := client.SuggestGasPrice(context.Background())
if err != nil {
log.Fatal(err)
}
methodName := "setitem"
input, err := contractABI.Pack(methodName, "key01", big.NewInt(2000))
// 创建交易并签名交易
chainID, err := client.NetworkID(context.Background())
tx := types.NewTransaction(nonce, common.HexToAddress(contractAddr), big.NewInt(0), 300000, big.NewInt(0).Add(gasPrice, big.NewInt(10000)), input)
signedTx, err := types.SignTx(tx, types.NewEIP155Signer(chainID), privateKey)
if err != nil {
log.Fatal(err)
}
// 发送交易
err = client.SendTransaction(context.Background(), signedTx)
if err != nil {
log.Fatal(err)
}
fmt.Printf("Transaction sent: %s\n", signedTx.Hash().Hex())
// 查询刚刚设置的值
callInput, err := contractABI.Pack("item", common.HexToAddress("地址"), "key01")
//callInput, err := contractABI.Pack("getitem", "key01")
if err != nil {
log.Fatal(err)
}
to := common.HexToAddress(contractAddr)
callMsg := ethereum.CallMsg{
From: fromAddress,
To: &to,
Data: callInput,
}
// 解析返回值
result, err := client.CallContract(context.Background(), callMsg, nil)
if err != nil {
log.Fatal(err)
}
// var unpacked int
//contractABI.UnpackIntoInterface(&unpacked, "item", result)
unpacked, _ := contractABI.Unpack("item", result)
if err != nil {
log.Fatal(err)
}
fmt.Println("is value saving in contract equals to origin value:", unpacked)
