Web3j v3.3.1:生成返回结构数组的已编译的实体智能合约时出错 [英] Web3j v3.3.1 : Error while generating compiled solidity smart contracts which returns array of struct

问题描述

我要从solidity函数返回一个结构数组，如下所示.

I am returning an array of struct from solidity function as below.

实用性实体^ 0.4.21;

实用的实验性ABIEncoderV2;

函数getPurchaseOrderForVendor(string vendorNameInput)常量返回(PurchaseOrderStruct [])

它被编译为abi和bin文件.问题在于使用web3j(v3.3.1)为合同创建包装文件.我收到以下错误.

It is compiled to abi and bin files. The issue is with creating wrapper files for the contract using web3j(v3.3.1). Im getting the below errors.

Generating com.contract.InvoiceSettlement_sol_InvoiceSettlement ... 
Exception in thread "main" java.lang.UnsupportedOperationException: 
Unsupported type
encountered: tuple
    at org.web3j.abi.datatypes.generated.AbiTypes.getType(AbiTypes.java:221)

    at org.web3j.codegen.SolidityFunctionWrapper.buildTypeName(SolidityFunct
ionWrapper.java:851)
    at org.web3j.codegen.SolidityFunctionWrapper.buildTypeNames(SolidityFunc
tionWrapper.java:508)
    at org.web3j.codegen.SolidityFunctionWrapper.buildFunction(SolidityFunct
ionWrapper.java:523)
    at org.web3j.codegen.SolidityFunctionWrapper.buildFunctionDefinitions(So
lidityFunctionWrapper.java:216)
    at org.web3j.codegen.SolidityFunctionWrapper.generateJavaFiles(SolidityF
unctionWrapper.java:112)
    at org.web3j.codegen.SolidityFunctionWrapper.generateJavaFiles(SolidityF
unctionWrapper.java:94)
    at org.web3j.codegen.SolidityFunctionWrapperGenerator.generate(SolidityF
unctionWrapperGenerator.java:123)
    at org.web3j.codegen.SolidityFunctionWrapperGenerator.main(SolidityFunct
ionWrapperGenerator.java:87)
    at org.web3j.codegen.SolidityFunctionWrapperGenerator.run(SolidityFuncti
onWrapperGenerator.java:48)
    at org.web3j.console.Runner.main(Runner.java:38)

推荐答案

Solidity不支持在外部调用中返回结构.仅在internal函数调用中允许使用.您需要分解结构并通过元组返回元素.

Solidity does not support returning structs in external calls. It is only allowed in internal function calls. You need to decompose the struct and return the elements via a tuple.

来源: Solidity文档

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