Question

我从solidity函数返回一个struct数组，如下所示。

pragma solidity ^ 0.4.21;

pragma experimental ABIEncoderV2;

function getPurchaseOrderForVendor（string vendorNameInput）constant return（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。我得到以下错误。

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)

Answer 1

Solidity不支持在外部调用中返回结构。它仅允许在internal函数调用中使用。您需要分解结构并通过元组返回元素。

来源：Solidity documentation

Web3j v3.3.1：生成编译的solidity smart contract时出错，返回struct数组

1 个答案: