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這篇文章給大家介紹Solidity中怎么利用returns函數(shù)接收多個(gè)值,內(nèi)容非常詳細(xì),感興趣的小伙伴們可以參考借鑒,希望對(duì)大家能有所幫助。
函數(shù)返回多個(gè)值
// 函數(shù)可以返回多個(gè)值 function multipleReturns() returns(uint a, uint b, uint c) { return (1, 2, 3); }
同時(shí)接收所有返回值
function processMultipleReturns() { uint a; uint b; uint c; // 這樣來做批量賦值: (a, b, c) = multipleReturns(); }
只接收部分返回值
// 或者如果我們只想返回其中一個(gè)變量: function getLastReturnValue() { uint c; // 可以對(duì)其他字段留空: (,,c) = multipleReturns(); }
項(xiàng)目中實(shí)際碰到問題
function multipleReturns() returns(string memory a, uint b, uint c) { return ("1", 2, 3); } function processMultipleReturns() { string memory a; uint b; uint c; // 這樣來做批量賦值: (a, b, c) = multipleReturns(); }
mapping (uint256 => Tree) public dnaToTree; //通過 Dna 獲取加密資產(chǎn)詳情 function getTreeByDna(uint256 _Dna) public constant returns(string memory treeByDna_user , uint256 treeByDna_dna,string memory treeByDna_treeName, uint64 treeByDna_birthTime, uint256 treeByDna_needFooder, bytes32 treeByDna_status, bool treeByDna_isAdult) { return (dnaToTree[_Dna].user, dnaToTree[_Dna].dna, dnaToTree[_Dna].treeName, dnaToTree[_Dna].birthTime, dnaToTree[_Dna].needFooder ,dnaToTree[_Dna].status ,dnaToTree[_Dna].isAdult); } function getTreeByDna_d(uint256 _Dna) public constant { string memory treeByDna_user; uint256 treeByDna_dna; string memory treeByDna_treeName; uint64 treeByDna_birthTime; uint256 treeByDna_needFooder; bytes32 treeByDna_status; bool treeByDna_isAdult; (treeByDna_user, treeByDna_dna, treeByDna_treeName, treeByDna_birthTime, treeByDna_needFooder, treeByDna_status, treeByDna_isAdult) = getTreeByDna(_Dna); }
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