账户
ViewOnlyAccount trait 提供了一个通用接口来查询余额。
Account trait 除了上述功能之外，还提供了一个通用接口来检索可花费的资源或转移资产。在执行 SDK 中导致交易的操作时，通常需要提供一个账户，该账户将用于分配交易所需的资源，包括交易费用。
这两个 trait 都由以下类型实现：
转移资产
一个账户实现了以下方法来转移资产：
-
transfer -
force_transfer_to_contract -
withdraw_to_base_layer
以下示例是针对 Wallet 账户的。Predicate 账户的工作方式类似，但在尝试花费其拥有的资源之前，您可能需要设置其断言数据。
使用 wallet.transfer 您可以启动一个交易，将资产从您的账户转移到目标地址。
use fuels::prelude::*;
// Setup 2 test wallets with 1 coin each
let num_wallets = Some(2);
let coins_per_wallet = Some(1);
let coin_amount = Some(1);
let wallets = launch_custom_provider_and_get_wallets(
WalletsConfig::new(num_wallets, coins_per_wallet, coin_amount),
None,
None,
)
.await?;
// Transfer the base asset with amount 1 from wallet 1 to wallet 2
let asset_id = Default::default();
let (_tx_id, _receipts) = wallets[0]
.transfer(wallets[1].address(), 1, asset_id, TxPolicies::default())
.await?;
let wallet_2_final_coins = wallets[1].get_coins(AssetId::zeroed()).await?;
// Check that wallet 2 now has 2 coins
assert_eq!(wallet_2_final_coins.len(), 2);
您可以通过 wallet.force_transfer_to_contract 将资产转移到合约。
// Check the current balance of the contract with id 'contract_id'
let contract_balances = wallet
.try_provider()?
.get_contract_balances(&contract_id)
.await?;
assert!(contract_balances.is_empty());
// Transfer an amount of 300 to the contract
let amount = 300;
let asset_id = random_asset_id;
let (_tx_id, _receipts) = wallet
.force_transfer_to_contract(&contract_id, amount, asset_id, TxPolicies::default())
.await?;
// Check that the contract now has 1 coin
let contract_balances = wallet
.try_provider()?
.get_contract_balances(&contract_id)
.await?;
assert_eq!(contract_balances.len(), 1);
let random_asset_balance = contract_balances.get(&random_asset_id).unwrap();
assert_eq!(*random_asset_balance, 300); 要将资产转移到基础层链，您可以使用 wallet.withdraw_to_base_layer。
use std::str::FromStr;
use fuels::prelude::*;
let wallets = launch_custom_provider_and_get_wallets(
WalletsConfig::new(Some(1), None, None),
None,
None,
)
.await?;
let wallet = wallets.first().unwrap();
let amount = 1000;
let base_layer_address = Address::from_str(
"0x4710162c2e3a95a6faff05139150017c9e38e5e280432d546fae345d6ce6d8fe",
)?;
let base_layer_address = Bech32Address::from(base_layer_address);
// Transfer an amount of 1000 to the specified base layer address
let (tx_id, msg_id, _receipts) = wallet
.withdraw_to_base_layer(&base_layer_address, amount, TxPolicies::default())
.await?;
let _block_height = wallet.try_provider()?.produce_blocks(1, None).await?;
// Retrieve a message proof from the provider
let proof = wallet
.try_provider()?
.get_message_proof(&tx_id, &msg_id, None, Some(2))
.await?
.expect("failed to retrieve message proof");
// Verify the amount and recipient
assert_eq!(proof.amount, amount);
assert_eq!(proof.recipient, base_layer_address); 上面的示例从字符串创建了一个 Address 并将其转换为 Bech32Address。接下来，它通过提供地址、要转移的金额和交易策略来调用 wallet.withdraw_to_base_layer。最后，为了验证转移是否成功，使用 provider.get_message_proof 检索相关的消息证明，并验证金额和接收方。