```exchange.IO("decode", ...)```函数返回解码后的数据。 当```dataFormat```参数指定的数据只有一个时返回一个字符串。 当```dataFormat```参数指定的数据有多个时返回一个数组。
array、string
exchange.IO(k, dataFormat, data)
```k```参数用于设置```exchange.IO()```函数的功能，设置为```"decode"```表示该函数用于数据解码。
k
true
string
```dataFormat```参数用于指定解码数据的类型、顺序。
dataFormat
true
string
```data```参数用于设置所要解码的数据。
data
true
string
```javascript
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)
var rawData = exchange.IO("decode", types, ret)
Log("decode:", rawData)
}
```javascript
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只使用了局部的exactOutput方法的内容，完整的abi可以在网上搜索
// 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)
}
Hier sind einige Beispiele.pathDas war bei der Parameterverarbeitung.encodePackedDas ist eine sehr schwierige Aufgabe, denn es ist eine sehr schwierige Aufgabe.exactOutputBenutzung von MethodenpathAls Parameter.encodeDer RoutenvertragexactOutputDie Methode, die nur einen Parameter hat, ist die ParameterarttupleDer Typ.exactOutputDer Code für den Methodennamen lautet:0x09b81346, benutztexchange.IO("decode", ...)Wie man das entziffertdecodeRaw, mit den VariablendataTupleEinverstanden.
Die Daten werden von den Behörden verarbeitet.exchange.IO()Die Funktion unterstützt nicht nur die Encode, sondern auch die Decode.