8
    pragma solidity ^0.4.4;
import "./strings.sol";


contract XFinance {
   using strings for *;

    address addr;
   uint coin;
   Shipment shipment;

function XFinance(uint balance) {
    coin=balance;
    shipment=new Shipment();

  }  



function changeShipmentStatus(string shipmentId,string st,address driverAddress){

            shipment.setShipmentId(shipmentId);
            shipment.setStatusOfShipment(st);
        processPayment(driverAddress);
}

function processPayment(address driverAddress){
    string currentStatus=shipment.getStatusOfShipment();
    if(currentStatus.toSlice().equals('RAP'.toSlice())){
        shipment.setAddressOfDiver1(driverAddress);
        sendPayment(driverAddress);
    }
    else if(currentStatus.toSlice().equals('DAL'.toSlice())){
        shipment.setAddressOfDiver2(driverAddress);
        sendPayment(driverAddress);
    }

    else
    if(currentStatus.toSlice().equals('ATD'.toSlice())){
        shipment.setAddressOfDriver3(driverAddress);
        sendPayment(driverAddress);
    }
}


function sendPayment(address beneficiary) payable returns(bool success) {
  if(msg.value==0) throw;
  if(!beneficiary.send(msg.value)) throw;
  return true;
}

function getBalance() returns(uint){
    return coin; 
}

function getStatus() returns(string){
    return shipment.statusOfShipment;
}

function getAddress() returns(address){
    return addr; 
}

}


contract Shipment{
    string public shipmentId;
    string public statusOfShipment;
    address public driver1;
    address public driver2;
    address public driver3;

    function Shipment(){}


    function setShipmentId(string shId){
    shipmentId=shId;
    }
    function getShipmentId() returns(string){
    return shipmentId;
    }

    function setStatusOfShipment(string st){
    statusOfShipment=st;
    }
    function getStatusOfShipment() returns(string){
    return statusOfShipment;
    }

    function setAddressOfDriver1(address d1){
    driver1=d1;
    }
    function getAddressOfDriver1() returns(address){
    return driver1;
    }

    function setAddressOfDriver2(address d2){
    driver2=d2;
    }
    function getAddressOfDriver2() returns(address){
    return driver2;
    }

    function setAddressOfDriver3(address d3){
    driver3=d3;
    }
    function getAddressOfDriver3() returns(address){
    return driver3;
    }
}

This is my contract

I get error while compiling it

C:/Users/User(LPT-APR2015-02)/solidity-experiments/contracts/XFinance.sol:35:2: Error: Type inaccessible dynamic type
is not implicitly convertible to expected type string storage pointer.
        string currentStatus=shipment.getStatusOfShipment();
        ^-------------------------------------------------^
,C:/Users/User(LPT-APR2015-02)/solidity-experiments/contracts/XFinance.sol:37:3: Error: Member "setAddressOfDiver1" no
t found or not visible after argument-dependent lookup in contract Shipment
                shipment.setAddressOfDiver1(driverAddress);
                ^-------------------------^
16

I was unable to completely correct this because I'm not sure of the contents of strings.sol.

The problem is dynamic length string can't be passed between contracts, yet.

The string type is very awkward due to its dynamic length and the fact that a character is not necessarily a single byte. As a general guideline, consider using bytes32 and offloading conversion chores to front-ends.

Fixed-length bytes32 is more gas-efficient and natural for the EVM. You won't have any problem passing them around.

Hope this helps.

1

It is supported since solidity 0.4.22;

Changelog: - Support accessing dynamic return data in post-byzantium EVMs.

  • Do you know how we can take advantage of this during local development? My local install of solc is Version: 0.4.24+commit.e67f0147.Darwin.appleclang but in web3py I compile my contracts with evm_version=='homestead' – Paymahn Moghadasian Aug 21 '18 at 13:59

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