Web3 – Calling Contract Functions with Parameters and Sending Ether from Geth

You should consider the following also.

pragma solidity ^0.4.17;

contract DeployedContract {
    uint public result = 0;

    function add(uint input) {
        result = result + input;
    }
}

contract Proxy {    
    address deployed_contract = 0x123;

    function directCall() public {
        DeployedContract(deployed_contract).add(123);
    }
}

Just assume the contract from the address.

Also, uint is an alias of uint256

Bytes32 is an array of bytes of length 32. Bytes first 32 bytes is a uint256 which contains the length of the bytes

call4 can be fixed with:

function call4() {
    deployed_contract.call("0x1003e2d20000000000000000000000000000000000000000000000000000000000000005");
    // does not compile: TypeError: Invalid rational number
}

As it takes bytes and bytes need to be enclosed in quotes, assuming that the data being passed is correct.

call5 needs to be passed an array with remix or simply just do the following:

function call5(bytes data) {
    // using call data from above (see call3), when using bytes32 as type, data is truncated to 0x1003e2d200000000000000000000000000000000000000000000000000000000
    deployed_contract.call(data); 
    // fails, since bytes32 truncates data  
}

And again, call it with

"0x1003e2d20000000000000000000000000000000000000000000000000000000000000005"

The problem is that totalSupply() implementation is missing. Seems like autogenerated getters do not count. So you need to explicitly create the function.

contract StandardToken is Token {
    uint256 _totalSupply;

    function totalSupply() constant returns (uint256 totalSupply) {
        totalSupply = _totalSupply;
    }
}