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message.sol
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message.sol
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pragma solidity ^0.4.11;
contract Message {
// The keyword "public" makes those variables
// readable from outside.
address public minter;
// Events allow light clients to react on
// changes efficiently.
event Sent(address from, address to, string message);
// This is the constructor whose code is
// run only when the contract is created.
function Message() {
minter = msg.sender;
}
function send(address receiver, string message) {
Sent(msg.sender, receiver, message);
}
}
//字串的處理在這邊有些問題:
//你只能先預設出長度,再取代其值(因為找不到字串串接的方式)
//string a = "hello"; 長度為5
//bytes(a).length = 15; 改成長度10
//for(uint i = 0; i < bytes(a).length; i++){ 把所以的值都改成b
//bytes(a)[i] = "b";
//}
//總結:要做字串處理全部都要先轉成bytes才行
//如果要串接就要寫函式:
//function substring(string x, string y) public returns (string){
//string z;
//bytes(z).length = bytes(x).length + bytes(y).length
//for(uint i = 0; i < bytes(x).length; i++){
//bytes(z)[i] = bytes(x)[i];
//}
//for(uint i = bytes(x).length; i < bytes(y).length + bytes(x).length ;i++){
//bytes(z)[i] = bytes(y)[i - bytes(x).length];
//}
//return z;
//}