【C++ 动态库加载和使用】

/*
**  File name:   Library.h
**  Author:      
**  Date:        2024-10-31
**  Brief:       动态库加载类
**  Copyright (C) 1392019713@qq.com All rights reserved.
*/

#ifndef LIBRARY_H
#define LIBRARY_H

#include <string>
#include <iostream>
#include "SystemExportLib.h"

#ifdef _WIN32
    #include <windows.h>
    typedef HMODULE Handle;
#elif __linux__
    #include <dlfcn.h>
    typedef void* Handle;
#endif // 


class SYSTEM_EXPORT CLibrary
{
public:
    CLibrary();

    virtual ~CLibrary();

    bool OpenLibrary(std::string const& strfilePath);

    void* Solve(std::string const &strName);

    CLibrary& operator=(CLibrary const &rParamter) = delete;

    CLibrary(CLibrary const &rParamter) = delete;

private:
    void CloseLibrary();

private:
    Handle m_handle;
};

#endif // !

#include "../Include/Library.h"

CLibrary::CLibrary()
{
m_handle = nullptr;
}

CLibrary::~CLibrary()
{
CloseLibrary();
}

#ifdef _WIN32

bool CLibrary::OpenLibrary(std::string const& strfilePath)
{
std::wstring wfilePath(strfilePath.begin(), strfilePath.end());
m_handle = ::LoadLibrary(wfilePath.c_str());
if (!m_handle)
{
std::cerr << "Failed to open library: " << GetLastError() << std::endl;
return false;
}
return true;
}

void* CLibrary::Solve(std::string const& strFuncName)
{
if (!m_handle)
{
return nullptr;
}
return ::GetProcAddress(m_handle, strFuncName.c_str());
}

void CLibrary::CloseLibrary()
{
if (!m_handle)
{
return;
}
::FreeLibrary(m_handle);
m_handle = nullptr;
}

#elif __linux__

bool CLibrary::OpenLibrary(std::string const& strfilePath)
{
m_handle = dlopen(strfilePath.c_str(), RTLD_LAZY);
if(!m_handle)
{
std::cerr << "Failed to open library: " << dlerror() << std::endl;
return false;
}
return true;
}

void* CLibrary::Solve(std::string const& strName)
{
if (!m_handle)
{
return nullptr;
}
return dlsym(m_handle, strName.c_str());
}

void CLibrary::CloseLibrary()
{
if(!m_handle) 
{
return;
}
dlclose(m_handle);
m_handle = nullptr;
}

#endif

使用

std::string libraryName = "PI_GCS2_DLL.dll";
std::string libraryPath = std::filesystem::current_path().string() + "\\" + libraryName;
m_bOpen = m_Library.OpenLibrary(libraryName);
PI_ConnectRS232 = (PFPI_ConnectRS232)m_Library.Solve("PI_ConnectRS232");
PI_MOV = (PFPI_MOV)m_Library.Solve("PI_MOV");
m_nId = PI_ConnectRS232(1, 115200);

原文地址：https://blog.csdn.net/weixin_45397344/article/details/143613389

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