返回指针的函数，当导入到单独的文件中时，返回数字而不是对象

问题描述 投票：0回答：1

我有一个名为 runner.py 的文件，其中有很多调用市场 DLL 的函数。

#Imports para execução da DLL
import time
import gc
from ctypes import *
from ctypes.wintypes import UINT
import struct
from datetime import*
import sys
import functions
from threading import Thread

rotPassword = '' 
accountID   = '' 
corretora   = '' 

profit_dll = WinDLL('./ProfitDLL64.dll')
profit_dll.argtypes  = None

def printPosition():
    global profit_dll
    global corretora, accountID

    asset = 'asset'
    bolsa = 'f'
    thisCorretora = corretora
    acc_id = accountID    
    priceToReturn = 0

    result = profit_dll.GetPosition(c_wchar_p(str(acc_id)), c_wchar_p(str(thisCorretora)), c_wchar_p(asset), c_wchar_p(bolsa))

    print(f'here {result}')    
    return result
    
    n_qtd = result[0]

    if (n_qtd == 0):
        print('Nao ha posicao para esse ativo')        
        return priceToReturn
    else:
        n_tam = result[1]       

        arr = cast(result, POINTER(c_char))
        frame = bytearray()
        for i in range(n_tam):
            c = arr[i]
            frame.append(c[0])
        
        start = 8

        for i in range(n_qtd):
            corretora_id = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            acc_id_length = struct.unpack('h', frame[start:start+2])[0]
            start += 2
            account_id = frame[start:start+acc_id_length]
            start += acc_id_length

            titular_length = struct.unpack('h', frame[start:start+2])[0]
            start += 2
            titular = frame[start:start+titular_length]
            start += titular_length

            ticker_length = struct.unpack('h', frame[start:start+2])[0]
            start += 2
            ticker = frame[start:start+ticker_length]
            start += ticker_length

            intraday_pos = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            price = struct.unpack('d', frame[start:start + 8])[0]       
            priceToReturn = str(price)     
            start += 8

            avg_sell_price = struct.unpack('d', frame[start:start + 8])[0]
            start += 8

            sell_qtd = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            avg_buy_price = struct.unpack('d', frame[start:start + 8])[0]
            start += 8

            buy_qtd = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            custody_d1 = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            custody_d2 = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            custody_d3 = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            blocked = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            pending = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            allocated = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            provisioned = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            qtd_position = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            available = struct.unpack('i', frame[start:start+4])[0]
            start += 4

            print(f"Corretora: {corretora_id}, Titular: {str(titular)}, Ticker: {str(ticker)}, Price: {price}, AvgSellPrice: {avg_sell_price}, AvgBuyPrice: {avg_buy_price}, SellQtd: {sell_qtd}, BuyQtd: {buy_qtd}")

        return priceToReturn

def dllStart():    
    try:
        global profit_dll
        key = input("Chave de acesso: ")
        user = input("Usuário: ") # preencher com usuário da conta (email ou documento)
        password = input("Senha: ") # preencher com senha da conta
        
        bRoteamento = True
        
        if bRoteamento :            
            result = profit_dll.DLLInitializeLogin(c_wchar_p(key), c_wchar_p(user), c_wchar_p(password), stateCallback, historyCallBack, orderChangeCallBack, accountCallback,
                                              newTradeCallback, newDailyCallback, priceBookCallback,
                                              offerBookCallback, newHistoryCallback, progressCallBack, newTinyBookCallBack)
        else :
            result = profit_dll.DLLInitializeMarketLogin(c_wchar_p(key), c_wchar_p(user), c_wchar_p(password), stateCallback, newTradeCallback, newDailyCallback, priceBookCallback,
                                                 offerBookCallback, newHistoryCallback, progressCallBack, newTinyBookCallBack)

        profit_dll.SendSellOrder.restype = c_longlong
        profit_dll.SendBuyOrder.restype = c_longlong
        profit_dll.SendStopBuyOrder.restype = c_longlong
        profit_dll.SendStopSellOrder.restype = c_longlong
        profit_dll.SendZeroPosition.restype = c_longlong
        profit_dll.GetAgentNameByID.restype = c_wchar_p
        profit_dll.GetAgentShortNameByID.restype = c_wchar_p
        profit_dll.GetPosition.restype = POINTER(c_int)
        profit_dll.SendMarketSellOrder.restype = c_longlong
        profit_dll.SendMarketBuyOrder.restype = c_longlong

        print('DLLInitialize: ' + str(result))
        wait_login()
      
    except Exception as e:
        print(str(e))

if __name__ == '__main__':    
    try:
        dllStart()

        strInput = ''        

        while strInput != "exit":
            strInput = input('Insira o comando: ')
            if strInput == 'subscribe':
                subscribeTicker()
            elif strInput == 'unsubscribe':
                unsubscribeTicker()
            elif strInput == 'offerbook':
                subscribeOffer()
            elif strInput == 'position':
                printPosition()
            elif strInput == 'lastAdjusted':
                printLastAdjusted()
            elif strInput == 'buystop' :
                buyStopOrder()
            elif strInput == 'sellstop':
                sellStopOrder()
            elif strInput == 'cancel':
                cancelOrder()
            elif strInput == 'changeOrder':
                changeOrder()
            elif strInput == 'cancelAllOrders':
                cancelAllOrders()
            elif strInput == 'getOrders':
                getOrders()
            elif strInput == 'getOrder':
                getOrder()
            elif strInput == 'selectOrder':
                selectOrder()
            elif strInput == 'cancelOrder':
                cancelOrder()
            elif strInput == 'getOrderProfitID':
                getOrderProfitID()
            elif strInput == 'getAllTickersByStock':
                getAllTickersByStock()           
            elif strInput == 'getOld':
                getSerieHistory()        
            elif strInput == 'account':
                getAccount()         
            elif strInput == 'myBuy':
                sendBuyOrder()               
    except KeyboardInterrupt:                
        pass

我调用时得到的正确日志：

<ctypes.wintypes.LP_c_long object at 0x000001714E9CABC0>

直接运行 

runner.py
并调用 
printPosition()
时，一切正常，并且返回我需要的内容（上面的对象）。
不过，我需要在单独的文件中导入此 printPosition 才能调用它。执行此操作时，我只收到了一个数字，而不是我需要的对象。

import socket, base64
import re
import sys
from operator import neg
from datetime import datetime
import profitrunner
import time
import gc
from ctypes import *
from ctypes.wintypes import UINT
import struct

def calculate_pos():
    memory_address = profitrunner.printPosition()       

    print(heapPosition)

    # I though on doing but did not work:  
  
    arr = cast(memory_address, POINTER(c_char))

来自此的日志：

2015042512
2015042656
2015042800
2015042944
2015043088
2015043232


GetPosition
的文档给了我这个：

function GetPosition(
    pwcIDAccount   : PWideChar;
    pwcIDCorretora : PWideChar;
    pwcTicker      : PWideChar;
    pwcBolsa       : PWideChar) : Pointer; stdcall;
python python-3.x pointers
1个回答
0
投票

你需要这样的东西：

import ctypes as ct

profit_dll = ct.WinDLL('./ProfitDLL64.dll')
profit_dll.GetPosition.argtypes = ct.c_wchar_p, ct.c_wchar_p, ct.c_wchar_p, ct.c_wchar_p
profit_dll.GetPosition.restype = ct.c_void_p

result = profit_dll.GetPosition(acc_id, thisCorretora, asset, bolsa)

返回类型只有

Pointer
，不具有描述性，所以我简单地使用了C 
void*
类型。实际的 C 原型会很有帮助。我还假设这四个参数是 Python 
str
。

最新问题
© www.soinside.com 2019 - 2024. All rights reserved.