IB用家討論區 (9)

```python
from ibapi.client import EClient
from ibapi.wrapper import EWrapper
from ibapi.contract import Contract
from ibapi.order import Order


class IBWrapper(EWrapper):
    def __init__(self):
        self.next_order_id = None

    def nextValidId(self, orderId: int):
        self.next_order_id = orderId


class IBClient(EClient):
    def __init__(self, wrapper):
        EClient.__init__(self, wrapper)


def create_contract(symbol: str, sec_type: str, exchange: str, currency: str):
    contract = Contract()
    contract.symbol = symbol
    contract.secType = sec_type
    contract.exchange = exchange
    contract.currency = currency
    return contract


def create_order(action: str, quantity: float):
    order = Order()
    order.action = action
    order.orderType = "MKT"  # 使用市價單
    order.totalQuantity = quantity
    return order


if __name__ == "__main__":
    # 建立 IBWrapper 和 IBClient
    wrapper = IBWrapper()
    client = IBClient(wrapper)
    client.connect("127.0.0.1", 7497, clientId=1)  # 連接到 IB 交易平台

    # 等待連接成功
    while not client.isConnected():
        pass

    # 等待接收下一個訂單 ID
    while wrapper.next_order_id is None:
        pass

    # 建立合約
    qqq_contract = create_contract("QQQ", "STK", "SMART", "USD")
    spy_contract = create_contract("SPY", "STK", "SMART", "USD")
    aapl_contract = create_contract("AAPL", "STK", "SMART", "USD")

    # 設置訂單
    qqq_order = create_order("BUY", 10)  # 購買 10 股 QQQ
    spy_order = create_order("BUY", 5)  # 購買 5 股 SPY
    aapl_order = create_order("BUY", 20)  # 購買 20 股 AAPL

    # 下單
    client.placeOrder(wrapper.next_order_id, qqq_contract, qqq_order)
    client.placeOrder(wrapper.next_order_id + 1, spy_contract, spy_order)
    client.placeOrder(wrapper.next_order_id + 2, aapl_contract, aapl_order)

    # 斷開連接
    client.disconnect()