如何在 Sui TS SDK 中使用 BCS 从移动函数中读取恒定返回值？

Question

我有一个 Move 函数，它返回一个常量值，如下所示： const FEE: u64 = 1_000_000 public fun fee(): u64 { FEE } When I make a moveCall using the Sui TS SDK, I receive encoded values like this: javascript Copy code returnValues: [ [ [ 64, 66, 15, 0, 0, 0, 0, 0 ], u64 ] ] 我知道我需要使用 BCS 库对这些值进行解码才能获得可读的输出. 但是，我不确定如何实现这一目标. 我尝试使用bcs.registerStructType，但看来这种方法不起作用，因为返回值不是结构. 有人能提供有关如何使用 Sui TS SDK 中的 BCS 库解码和读取这个常量返回值的指导吗？

Jeremy · Answer

You dont need to register a struct type for decoding a u64 value using the BCS (Binary Canonical Serialization) library. You can directly decode the encoded value using the bcs.decode method. Heres how you can decode and read the constant return value in your case: const bcs = require(bcs); // Import the BCS library const encodedValue = Uint8Array.from([ 64, 66, 15, 0, 0, 0, 0, 0 ]); // Encoded value received from the moveCall const decodedValue = bcs.decode(u64, encodedValue); // Decode the u64 value console.log(Decoded result:, decodedValue); // Output: Decoded result: 1000000 In the code above, the bcs.decode function takes the type u64 and the encoded value as input and returns the decoded result. The decoded value will be 1000000 in this case, corresponding to the constant value returned by your Move function.

Steven · Answer

The Binary Canonical Serialization (BCS) library in Move smart contract language provides a way to encode and decode data structures. In your case, you want to decode a u64 value from an encoded byte array. You can do this directly using the bcs.decode method, as you have shown in your code snippet. const bcs = require(bcs); // Import the BCS library const encodedValue = Uint8Array.from([ 64, 66, 15, 0, 0, 0, 0, 0 ]); // Encoded value received from the moveCall const decodedValue = bcs.decode(u64, encodedValue); // Decode the u64 value console.log(Decoded result:, decodedValue); // Output: Decoded result: 1000000 In this code, you are using the bcs.decode function to decode a u64 value from an encoded byte array. The bcs.decode function takes two arguments: the type of the value to decode (u64 in this case) and the encoded byte array. It returns the decoded value. The bcs.decode function is part of the BCS library, which is a JavaScript implementation of the Move languages binary serialization format. This library allows you to encode and decode Move data structures in JavaScript. Please note that this code assumes that the encoded byte array represents a u64 value. If the encoded byte array represents a different type of value, you will need to change the type argument to bcs.decode. Also, the bcs.decode function throws an error if the encoded byte array is not a valid encoding of the specified type. Therefore, you should use a try/catch block to handle potential errors digitalocean.com. In conclusion, you can decode a u64 value from an encoded byte array using the bcs.decode method of the BCS library in Move smart contract language. This allows you to interact with Move data structures in JavaScript.

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如何在 Sui TS SDK 中使用 BCS 从移动函数中读取恒定返回值？

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