exchange.IO("encode", ...)

The exchange.IO("encode", ...) function is used for data encoding operations.

    
    
    
exchange.IO(k, dataFormat, ...args)

    
    
    
exchange.IO(k, address, dataFormat)

    
    
    
exchange.IO(k, address, dataFormat, ...args)

Examples

• Taking the encoding of unwrapWETH9 method call as an example:

  
      javascript
      
      
  function main() {
      // ContractV3SwapRouterV2 主网地址 : 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45
      // 调用unwrapWETH9方法需要先注册ABI，此处省略注册
      // "owner"代表钱包地址，需要具体填写，1代表解包装数量，把一个WETH解包装为ETH
      var data = exchange.IO("encode", "0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45", "unwrapWETH9(uint256,address)", 1, "owner")
      Log(data)
  }
  

• Encoding example equivalent to abi.encode in Solidity:

  
      javascript
      
      
  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 即 uint256 , FMZ上需要指定类型长度
      Log("ret:", ret)
      /*
      000000000000000000000000000000000000000000000000000000000000000a    // x
      00000000000000000000000002a5fbb259d20a3ad2fdf9ccadef86f6c1c1ccc9    // address
      0000000000000000000000000000000000000000000000000000000000000080    // str 的偏移
      00000000000000000000000000000000000000000000000000000000000000c0    // array 的偏移
      000000000000000000000000000000000000000000000000000000000000000b    // str 的长度
      48656c6c6f20576f726c64000000000000000000000000000000000000000000    // str 数据
      0000000000000000000000000000000000000000000000000000000000000003    // array 的长度
      0000000000000000000000000000000000000000000000000000000000000001    // array 第一个数据
      0000000000000000000000000000000000000000000000000000000000000002    // array 第二个数据
      0000000000000000000000000000000000000000000000000000000000000003    // array 第三个数据
      */
  }
  

• Supports encoding of tuples or type sequences containing tuples. This type sequence consists of tuple and bytes, so when calling exchange.IO() for encoding, two corresponding parameters need to be passed:

  • 1. Variable corresponding to tuple type:

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

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

    
                javascript
                
                
    "0011"
    

  
      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)
  }
  

• Supports encoding of arrays or type sequences containing arrays:

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

Returns

Arguments

Remarks

The exchange.IO() function encapsulates the encode method, which can encode function calls and return them as hex string format. For specific usage, please refer to the platform's public "Uniswap V3 Trading Library" template.

When encoding smart contract method calls, the corresponding ABI must be registered first.