发送请求函数：ReqQryInstrumentCommissionRate

先查阅官方文档，可以知道以下重要信息：

1、需要发送的文件名是CThostFtdcQryInstrumentCommissionRateField；

2、是否可作为过滤条件，意味着并非是必填项，可以根据自己需求过滤

3、它的响应是：OnRspQryInstrumentCommissionRate

根据以上信息可以写出查询代码：

    # 请求查询合约手续费率，对应响应 OnRspQryInstrumentCommissionRate。如果InstrumentID填空，则返回持仓对应的合约手续费率。
    def qryInstrumentCommissionRate(self, code):
        qryFile = tdapi.CThostFtdcQryInstrumentCommissionRateField()
        qryFile.BrokerID = str(self.Account.broker_id)
        qryFile.InvestorID = str(self.Account.investor_id)
        qryFile.InstrumentID = code
        # 请求查询合约手续费率，对应响应 OnRspQryInstrumentCommissionRate。如果InstrumentID填空，则返回持仓对应的合约手续费率。
        ret = self.tduserapi.ReqQryInstrumentCommissionRate(qryFile, 0)
        if ret == 0:
            timePrintLog('发送查询手续费成功！')
        else:
            timePrintLog('发送查询手续费失败！')
            judge_ret(ret)
            while ret != 0:
                qryFile = tdapi.CThostFtdcQryInstrumentCommissionRateField()
                qryFile.BrokerID = str(self.Account.broker_id)
                qryFile.InvestorID = str(self.Account.investor_id)
                qryFile.InstrumentID = code
                ret = self.tduserapi.ReqQryInstrumentCommissionRate(qryFile, 0)
                timePrintLog('正在查询手续费...')
                time.sleep(5)
        time.sleep(1)

响应函数：OnRspQryInstrumentCommissionRate

根据参数选择自己需要的数据，响应代码示例（保存到本地）：

    # 请求查询合约手续费率响应，当执行ReqQryInstrumentCommissionRate后，该方法被调用。
    def OnRspQryInstrumentCommissionRate(self, pInstrumentCommissionRate, pRspInfo, nRequestID, bIsLast):
        try:
            print(f'合约名称：{pInstrumentCommissionRate.InstrumentID}')
            print(f'开仓手续费率：{pInstrumentCommissionRate.OpenRatioByMoney}')
            print(f'开仓手续费：{pInstrumentCommissionRate.OpenRatioByVolume}')
            print(f'平仓手续费率：{pInstrumentCommissionRate.CloseRatioByMoney}')
            print(f'平仓手续费：{pInstrumentCommissionRate.CloseRatioByVolume}')
            sec = pInstrumentCommissionRate.InstrumentID
            # 需要判断section是否存在，如果不存在会报错，option不需要检查是否存在
            if not g.productInfo.has_section(sec):
                g.productInfo.add_section(sec)

            # 填写开仓手续费率
            opt = '开仓手续费率'
            g.productInfo.set(sec, opt, str(pInstrumentCommissionRate.OpenRatioByMoney))

            # 填写开仓手续费
            opt = '开仓手续费'
            g.productInfo.set(sec, opt, str(pInstrumentCommissionRate.OpenRatioByVolume))

            # 填写平仓手续费率
            opt = '平仓手续费率'
            g.productInfo.set(sec, opt, str(pInstrumentCommissionRate.CloseRatioByMoney))

            # 填写平仓手续费
            opt = '平仓手续费'
            g.productInfo.set(sec, opt, str(pInstrumentCommissionRate.CloseRatioByVolume))

            # 填写平今手续费率
            opt = '平今手续费率'
            g.productInfo.set(sec, opt, str(pInstrumentCommissionRate.CloseTodayRatioByMoney))

            # 填写平今手续费
            opt = '平今手续费'
            g.productInfo.set(sec, opt, str(pInstrumentCommissionRate.CloseTodayRatioByVolume))

            # 写入ini文件
            g.productInfo.write(open(g.productInfo_fileName, "w", encoding='utf-8'))

        except Exception as e:
            red_print(e)

保存的位置：

结果展示：

完整代码：

import json
import time
from threading import Thread

from API import thosttraderapi as tdapi  # 交易接口
from API import thostmduserapi as mdapi  # 行情接口
import program.Global as g  # 全局变量
from program.function import *
import traceback


class CTraderSpi(tdapi.CThostFtdcTraderSpi):
    def __init__(self, tduserapi, Account):
        tdapi.CThostFtdcTraderSpi.__init__(self)
        self.tduserapi = tduserapi
        self.Account = Account

    # 连接前台
    def OnFrontConnected(self):
        print("开始建立交易连接")
        authfield = tdapi.CThostFtdcReqAuthenticate