Contract Address Using in Solidity Language

Ethereum VM address is 20 bytes, but TRON's VM address is 21 bytes.

1. address conversion

Need to convert TRON's address while using in solidity (recommended):

/**
  * @dev convert uint256 (HexString add 0x at beginning) tron address to solidity address type
  * @param  tronAddress uint256 tronAddress, begin with 0x, followed by HexString
  * @return Solidity address type
  */
     
function convertFromTronInt(uint256 tronAddress) public view returns(address){
      return address(tronAddress);
}

This is similar with the grammar of the conversion from other types converted to address type in Ethereum.

2. address judgement

Solidity has address constant judgement, if using 21 bytes address the compiler will throw out an error, so you should use 20 bytes address, like:

function compareAddress(address tronAddress) public view returns (uint256){
     // if (tronAddress == 0x41ca35b7d915458ef540ade6068dfe2f44e8fa733c) { // compile error
     if (tronAddress == 0xca35b7d915458ef540ade6068dfe2f44e8fa733c) { // right
          return 1;
     } else {
          return 0;
     }
}

But if you are using wallet-cli, you can use 21 bytes address, like 0000000000000000000041ca35b7d915458ef540ade6068dfe2f44e8fa733c

3. variable assignment

Solidity has address constant assignment, if using 21 bytes address the compiler will throw out an error, so you should use 20 bytes address, like:

function assignAddress() public view {
     // address newAddress = 0x41ca35b7d915458ef540ade6068dfe2f44e8fa733c; // compile error
     address newAddress = 0xca35b7d915458ef540ade6068dfe2f44e8fa733c;
     // do something
}

Updated about 4 years ago