Support encode

The function exchange.IO encapsulates the encode method, which can return the function call encoding to hex string format. You can refer to the platform’s publicly available “Uniswap V3 Trading Class Library” template for specific use. The call of the encoding unwrapWETH9 method is used here as an example:

function main() {
    // Main network address of ContractV3SwapRouterV2: 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45
    // To call the unwrapWETH9 method, you need to register the ABI first, omit the registration here.
    // "owner" represents the wallet address, it needs to fill in the specific, 1 represents the number of unwrapping, unwrap a WETH into ETH
    var data = exchange.IO("encode", "0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45", "unwrapWETH9(uint256,address)", 1, "owner")
    Log(data)
}

When calling the exchange.IO("encode",...) function, if the second parameter (string type) starts with 0x, it means the method call on the encoded (encode) smart contract. If it does not start with 0x, it is used to code the specified type order. The function is the same as the abi.encode in the solidity. Refer to the following example.

function main() {
    var x = 10 
    var address = "0x02a5fBb259d20A3Ad2Fdf9CCADeF86F6C1c1Ccc9"
    var str = "Hello World"
    var array = [1, 2, 3]
    var ret = exchange.IO("encode", "uint256,address,string,uint256[]", x, address, str, array)   // uint i.e. uint256 , the type length needs to be specified on FMZ
    Log("ret:", ret)
    /*
    000000000000000000000000000000000000000000000000000000000000000a    // x
    00000000000000000000000002a5fbb259d20a3ad2fdf9ccadef86f6c1c1ccc9    // address
    0000000000000000000000000000000000000000000000000000000000000080    // offset of str
    00000000000000000000000000000000000000000000000000000000000000c0    // offset of array
    000000000000000000000000000000000000000000000000000000000000000b    // the length of str
    48656c6c6f20576f726c64000000000000000000000000000000000000000000    // str data
    0000000000000000000000000000000000000000000000000000000000000003    // the length of the array
    0000000000000000000000000000000000000000000000000000000000000001    // array the first data
    0000000000000000000000000000000000000000000000000000000000000002    // array the second data
    0000000000000000000000000000000000000000000000000000000000000003    // array the third data
    */
}

Support the sequential encoding of tuples or types containing tuples:

function main() {
    var types = "tuple(a uint256,b uint8,c address),bytes"
    var ret = exchange.IO("encode", types, {
        a: 30,
        b: 20,
        c: "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
    }, "0011")
    Log("encode: ", ret)
}

This type order is composed of tuple and bytes, so two parameters need to be passed in when calling exchange.IO to encode:

• Variables corresponding to type tuple:

  {
      a: 30,
      b: 20,
      c: "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
  }
  

  The parameters passed in must also be consistent with the structure and type of tuple, as defined in the types parameter: tuple(a uint256, b uint8, c address).
• Variables corresponding to type bytes:

  "0011"
  

Support for sequential encoding of arrays or types containing arrays:

function main() {
    var path = ["0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2", "0xdac17f958d2ee523a2206206994597c13d831ec7"]   // ETH address, USDT address
    var ret = exchange.IO("encode", "address[]", path)
    Log("encode: ", ret)
}

Method of Calling Ethereum RPC Support for encodePacked