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函数返回多个值
// 函数可以返回多个值
function multipleReturns() returns(uint a, uint b, uint c) {
return (1, 2, 3);
}同时接收所有返回值
function processMultipleReturns() {
uint a;
uint b;
uint c;
// 这样来做批量赋值:
(a, b, c) = multipleReturns();
}只接收部分返回值
// 或者如果我们只想返回其中一个变量:
function getLastReturnValue() {
uint c;
// 可以对其他字段留空:
(,,c) = multipleReturns();
}项目中实际碰到问题
function multipleReturns() returns(string memory a, uint b, uint c) {
return ("1", 2, 3);
}
function processMultipleReturns() {
string memory a;
uint b;
uint c;
// 这样来做批量赋值:
(a, b, c) = multipleReturns();
} mapping (uint256 => Tree) public dnaToTree;
//通过 Dna 获取加密资产详情
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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