访问 DLL 中的函数时出现调试断言失败错误

问题描述

我目前正在学习如何创建要在其他项目中引用的 C++ 库，但我遇到了“调试断言失败”错误：is_block_type_valid(header-> _block_use)。我遵循了此处显示的演练：Create and use your own Dynamic Link Library。奇怪的是，如果我忽略错误，我会得到预期的答案。

我的 DLL 目前只有一个功能：

cpp：

int calculate_crc(std::string msg)
{
    std::vector<std::string> msg_vector = [](std::string& msg1) {
        std::string next;
        std::vector<std::string> result;

        // for each char in string
        for (std::string::const_iterator it = msg1.begin(); it != msg1.end(); it++)
        {
            // if we hit a terminal char
            if (*it == ' ')
            {
                if (!next.empty())
                {
                    // add them to the result vector
                    result.push_back(next);
                    next.clear();
                }
            }
            else
            {
                next += *it;
            }
        }
        if (!next.empty())
        {
            result.push_back(next);
        }

        return result;
    } (msg);

    int crcReg = 0xFFFF;

    // iterate through each element in msgVector
    for (auto&& element : msg_vector)
    {
        // step 2: xor operation performed on byte of msg and CRC register
        crcReg ^= [](std::string hex) {
            std::map<char,int> map;

            map['0'] = 0;
            map['1'] = 1;
            map['2'] = 2;
            map['3'] = 3;
            map['4'] = 4;
            map['5'] = 5;
            map['6'] = 6;
            map['7'] = 7;
            map['8'] = 8;
            map['9'] = 9;
            map['a'] = 10;
            map['b'] = 11;
            map['c'] = 12;
            map['d'] = 13;
            map['e'] = 14;
            map['f'] = 15;

            return map[hex[1]] + (map[hex[0]] * 16);
        } (element);

        // step 3-5 are repeated until 8 bit shifts
        for (int i = 0; i < 8; i++)
        {
            int crccopy = crcReg;
            crcReg >>= 1;

            if ((crccopy & 1) == 0)
                continue;
            else
                crcReg ^= 0xA001;
        }
    }

    return crcReg;
}

h：

#pragma once

#ifdef omrONLIBRARY_EXPORTS
#define omrONLIBRARY_API __declspec(dllexport)
#else
#define omrONLIBRARY_API __declspec(dllimport)
#endif

#include <iostream>

extern "C" omrONLIBRARY_API int calculate_crc(const std::string msg);

解决方法

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