在 Anchor 中读取账户余额：Solana 的 address(account).balance

在 Rust 中读取账户余额

在 Solana Anchor 程序中，可通过以下代码读取任意账户的 Lamports 余额：

use anchor_lang::prelude::*;

declare_id!("7caefaGpKb1E48AkThaVqZqV12WdxbigeVhmRJyVt1EL");

#[program]
pub mod balance {
    use super::*;

    pub fn read_balance(ctx: Context<ReadBalance>) -> Result<()> {
        let balance = ctx.accounts.acct.to_account_info().lamports();

        msg!("balance in Lamports is {}", balance);
        Ok(())
    }
}

#[derive(Accounts)]
pub struct ReadBalance<'info> {
    /// CHECK: although we read this account's balance, we don't do anything with the information
    pub acct: UncheckedAccount<'info>,
}

测试代码：

import * as anchor from "@coral-xyz/anchor";
import { Program } from "@coral-xyz/anchor";
import { Balance } from "../target/types/balance";

describe("balance", () => {
  anchor.setProvider(anchor.AnchorProvider.env());
  const program = anchor.workspace.Balance as Program<Balance>;
  let pubkey = new anchor.web3.PublicKey("5NhLjdFKocoRMqic9sqAe5TxLagJCoCBunzg51ioMYot");

  it("Tests the balance", async () => {
    const tx = await program.methods.readBalance().accounts({ acct: pubkey }).rpc();
  });
});

本例引入了 UncheckedAcco...