Question

我正在用松露开发虚拟测试合同，代码如下，

pragma solidity ^0.4.17;

import "truffle/Assert.sol";
import "truffle/DeployedAddresses.sol";
import "../contracts/SkillDevelopment.sol";

contract TestSkillDevelopment {
    SkillDevelopment skillDevelopmentContract = SkillDevelopment(DeployedAddresses.SkillDevelopment());
    function testSetStudentEnrollInfo() public {
        skillDevelopmentContract.setStudentEnrollInfo("{\"Info\":[{\"id\":\"06bb05b8b3152b0323f4a9c07ae84f0c513b24946a8f8ec685af7cd763f7ffad\",\"studentId\":6532916,\"parenterId\":6187778,\"schemeId\":3853115,\"batchId\":3458926,\"instructorId\":1175723,\"trainingId\":2599715,\"studentSkillState\":1,\"state\":1}]}");
        string expected = string("{\"Info\":[{\"id\":\"06bb05b8b3152b0323f4a9c07ae84f0c513b24946a8f8ec685af7cd763f7ffad\",\"studentId\":6532916,\"parenterId\":6187778,\"schemeId\":3853115,\"batchId\":3458926,\"instructorId\":1175723,\"trainingId\":2599715,\"studentSkillState\":1,\"state\":1}]}");
        Assert.equal(skillDevelopmentContract.getStudentEnrollInfo(), expected, "The message should be set");
    }

}

但是收到错误

“TypeError：不允许从”literal_string“到字符串存储指针”的显式类型转换。“

在运行“truffle test”命令时。

请提示，这里有多么不正确。

Answer 1

请改为尝试：

string memory expected = "{\"Info\":[{\"id\":\"06bb05b8b3152b0323f4a9c07ae84f0c513b24946a8f8ec685af7cd763f7ffad\",\"studentId\":6532916,\"parenterId\":6187778,\"schemeId\":3853115,\"batchId\":3458926,\"instructorId\":1175723,\"trainingId\":2599715,\"studentSkillState\":1,\"state\":1}]}";

string的默认位置是storage，这意味着您必须将其指向存储中的某个状态变量。切换到memory可解决该问题。最后，显式转换为string是不必要的（因为该值已经是一个字符串）并导致您看到的编译错误。

从“literal_string到”字符串存储指针不允许显式类型转换“

1 个答案: