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messenger.sol
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messenger.sol
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contract messenger {
struct Message {
address sender;
string text;
}
struct Messages {
uint32 counter;
mapping (uint32 => Message) My_Messages;
}
mapping (address => Messages) All_Messages;
event Message_sent(address _receiver);
// send first message to creator
function get_latest_message(address _receiver) constant returns (string) {
uint32 counter= All_Messages[_receiver].counter;
return All_Messages[_receiver].My_Messages[counter].text;
}
function get_message(address _receiver, uint32 index) constant returns (string) {
return All_Messages[_receiver].My_Messages[index].text;
}
function get_sender(address _receiver, uint32 index) constant returns (address) {
return All_Messages[_receiver].My_Messages[index].sender;
}
function get_counter(address _receiver) constant returns (uint32) {
return All_Messages[_receiver].counter;
}
function messenger () {
All_Messages[msg.sender].counter= 1;
All_Messages[msg.sender].My_Messages[1].sender= msg.sender;
All_Messages[msg.sender].My_Messages[1].text= 'Hello World';
}
function send_message(address _receiver, string _text) returns (bool) {
if (All_Messages[_receiver].counter > 0)
All_Messages[_receiver].counter++;
else
All_Messages[_receiver].counter= 1;
uint32 counter= All_Messages[_receiver].counter;
All_Messages[_receiver].My_Messages[counter].text= _text;
All_Messages[_receiver].My_Messages[counter].sender= msg.sender;
Message_sent(_receiver);
return true;
}
}