[Ethereum] Member “call” not found or not visible after argument-dependent lookup

contract-debuggingsolidity

Here's the contract:

contract Martyr{
  function Martyr(){ 
    var address0 = 0x093ff7d4edbd201f1762297e31afcde50bdf4c81;
    address0.call(bytes4(0x2808241a),0x85a46e616d65a673746f726533a870726f647563747390a4696e666fc0ae7375626d61726b6574416464727390aa7472616e73706f7274739183a26964a737353837373439a474797065a461736664a57072696365a132);
    suicide(msg.sender);
  }
}

And here's the error it generates

:3:60: Error: Member "call" not found or not visible after argument-dependent lookup in uint160 var address0 = 0x093ff7d4edbd201f1762297e31afcde50bdf4c81; address0.call(bytes4(0x2808241a),0x85a46e616d65a673746f726533a870726f647563747390a4696e666fc0ae7375626d61726b6574416464727390aa7472616e73706f7274739183a26964a737353837373439a474797065a461736664a57072696365a132);

Whats the error trying to say, and how can I solve it?

Best Answer

Use address address0 = 0x093ff7d4edbd201f1762297e31afcde50bdf4c81;

Then put quotes around 0x85a46....

Those will fix the errors in https://ethereum.github.io/browser-solidity

There will be warnings about the address (check that it's correct) and use bool unused = address0.call... to avoid Warning: Return value of low-level calls not used.

Related Solutions

[Ethereum] Member “mul” not found or not visible after argument

You stumbled into an advanced pattern.

You could say

uint256 tokens = msg.value * RATE;

That would do the trick except that it might overflow if the result is ever over 2^256. To make sure that and other nasty things don't ever happen, there is a popular SafeMath.sol contract you can use. It's over here: https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/math/SafeMath.sol

Then you might start out with:

import "./SafeMath.sol";

contract myContract {

  using SafeMath for uint256;

  // ... carry on

Now, type uint256 has a method .mul that the compiler is looking for.

Hope it helps.

[Ethereum] Member “length” not found or not visible after argument-dependent lookup in string memory

The error message is pretty clear. You're trying to access a member called length on a variable of type string, but no such member exists.

From https://solidity.readthedocs.io/en/v0.4.23/types.html#arrays:

string is equal to bytes but does not allow length or index access (for now).

To accomplish your goal, you probably want to cast to bytes. From the same documentation:

If you want to access the byte-representation of a string s, use bytes(s).length / bytes(s)[7] = 'x';. Keep in mind that you are accessing the low-level bytes of the UTF-8 representation, and not the individual characters!

Best Answer

Related Solutions

[Ethereum] Member “mul” not found or not visible after argument

[Ethereum] Member “length” not found or not visible after argument-dependent lookup in string memory

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