I'm finding to way to encode parameter using viem before writing to contract.

[Asaki-Katsu]

Hi, I have these 3 structs:

struct T1 {
 uint8  foo,
 bytes bar
}

However, bar is a bytes data that is supposed to be decoded into struct T2 like this

struct T2 {
   T3 foo2,
   bytes bar2
}

struct T3 {
  bytes32 aa,
  address bb,
  uint256 cc,
  uint64 dd
}

Could anyone give me a how-to encode this kind of struct with viem in .js before writing to the contract?

[tmm]

Can you share some code of what you tried already?

[Asaki-Katsu]

Hi, I did solve it, I just simply ignore the 2nd struct like this

const encoded = encodeAbiParameters(
        parseAbiParameters('bytes32 aa, address bb, uint256 cc, uint64 dd, bytes bar2'),
        [
          data1,
          data2,
          data3,
          data4,
          data5,
        ],
      )

[Asaki-Katsu]

At first I thought I have to encode struct T3 first, then encode it with bytes bar2 in order to fit with struct T2. However, tried some and found that just ignore the struct, and encoding it orderly works.

[Asaki-Katsu]

Found that by inserting struct in the struct, it's simply like concat the data in the bytes, nothing complicated, I forgot this point haha.