Sokongan untuk mendekod

Pemprosesan data bukan sahaja menyokong pengekodan (encode), tetapi juga mendekod (decode) Gunakanexchange.IO("decode", types, rawData)fungsi untuk melaksanakandecode operation.

function main() {
    // register SwapRouter02 abi
    var walletAddress = "0x398a93ca23CBdd2642a07445bCD2b8435e0a373f"
    var routerAddress = "0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45"
    var abi = `[{"inputs":[{"components":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMaximum","type":"uint256"}],"internalType":"struct IV3SwapRouter.ExactOutputParams","name":"params","type":"tuple"}],"name":"exactOutput","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"}]`
    exchange.IO("abi", routerAddress, abi)   // abi only uses the contents of the local exactOutput method, the full abi can be searched on the Internet

    // encode path
    var fee = exchange.IO("encodePacked", "uint24", 3000)
    var tokenInAddress = "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
    var tokenOutAddress = "0xdac17f958d2ee523a2206206994597c13d831ec7"
    var path = tokenInAddress.slice(2).toLowerCase()
    path += fee + tokenOutAddress.slice(2).toLowerCase()
    Log("path:", path)

    var dataTuple = {
        "path" : path, 
        "recipient" : walletAddress, 
        "amountOut" : 1000, 
        "amountInMaximum" : 1, 
    }
    // encode SwapRouter02 exactOutput 
    var rawData = exchange.IO("encode", routerAddress, "exactOutput", dataTuple)
    Log("method hash:", rawData.slice(0, 8))   // 09b81346
    Log("params hash:", rawData.slice(8))

    // decode exactOutput params
    var decodeRaw = exchange.IO("decode", "tuple(path bytes,recipient address,amountOut uint256,amountInMaximum uint256)", rawData.slice(8))
    Log("decodeRaw:", decodeRaw)
}

Contoh ini melakukanencodePackedoperasi pertama semasapathpemprosesan parameter, keranaexactOutputpanggilan kaedah yang perlu dikodkan kemudian memerlukanpathsebagai parameter. Kemudian,encodekaedahexactOutputkontrak laluan hanya mempunyai satu parameter, dan jenis parameter adalahtuple. KaedahexactOutputnama dikodkan sebagai0x09b81346, yang telah didekodkan hasildecodeRawolehexchange.IO ("decode",...)kaedah, dan ia adalah konsisten dengan pembolehubahdataTuple.

Sokongan untuk encodePacked Sokongan untuk menukar kunci peribadi