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GeezerVison is showing github.com — DynamicModuleLoader/DynamicModuleLoader.cpp at master · HW140701/DynamicModuleLoader

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DynamicModuleLoader.cpp

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#include "DynamicModuleLoader.h"
namespace DynamicModuleLoaderSpace
{
DynamicModuleLoader::DynamicModuleLoader() :m_DynamicModulePtr(NULL), m_ErrorMessage(""), m_DynamicModuleState(DynamicModuleState::DMS_UnLoaded)
{
}
DynamicModuleLoader::~DynamicModuleLoader()
{
}
bool DynamicModuleLoader::IsFileExist(const std::string filePath)
{
std::fstream file;
file.open(filePath, std::ios::in);
if (file)
{
file.close();
return true;
}
else
{
return false;
}
}
bool DynamicModuleLoader::LoadDynamicModule(const std::string dynamicModulePath)
{
if (IsFileExist(dynamicModulePath))
{
#ifdef WINDOWS
m_DynamicModulePtr = LoadLibrary(dynamicModulePath.c_str());
#elif LINUX
m_DynamicModulePtr = dlopen(dynamicModulePath.c_str(), RTLD_NOW | RTLD_GLOBAL);
#endif // WINDOWS
if (m_DynamicModulePtr != NULL)
{
m_DynamicModuleState = DynamicModuleState::DMS_Loaded;
return true;
}
else
{
#ifdef WINDOWS
int errorCode = GetLastError();
#endif
GetInternalErrorMessge(errorCode);
return false;
}
}
return false;
}
void* DynamicModuleLoader::GetFunction(const std::string functionName)
{
if (m_DynamicModulePtr)
{
void* tempFunctionPtr = NULL;
#ifdef WINDOWS
tempFunctionPtr = GetProcAddress(m_DynamicModulePtr, functionName.c_str());
#elif LINUX
tempFunctionPtr = dlsym(m_DynamicModulePtr, functionName.c_str());
#endif // WINDOWS
if (tempFunctionPtr != NULL)
{
return tempFunctionPtr;
}
else
{
#ifdef WINDOWS
int errorCode = GetLastError();
#endif
GetInternalErrorMessge(errorCode);
}
}
return NULL;
}
bool DynamicModuleLoader::UnloadDynamicModule()
{
if (m_DynamicModulePtr)
{
#ifdef WINDOWS
if (FreeLibrary(m_DynamicModulePtr) == 0)
{
int errorCode = GetLastError(); // 得到错误代码
GetInternalErrorMessge(errorCode);
return false;
}
#elif LINUX
dlclose(m_DynamicModulePtr);
#endif
m_DynamicModuleState = DynamicModuleState::DMS_UnLoaded;
return true;
}
return false;
}
#ifdef WINDOWS
#endif
void DynamicModuleLoader::GetInternalErrorMessge(int errorCode)
{
std::string errorMessge = "";
#ifdef WINDOWS
LPVOID lpMsgBuf;
if (FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS |
FORMAT_MESSAGE_MAX_WIDTH_MASK,
NULL,
errorCode,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&lpMsgBuf,
0,
NULL
))
{
errorMessge = (LPCTSTR)(lpMsgBuf);
LocalFree(lpMsgBuf);
}
#elif LINUX
errorMessge = dlerror();
#endif // WINDOWS
m_ErrorMessage = errorMessge;
}
std::string DynamicModuleLoader::GetErrorMessage()
{
return m_ErrorMessage;
}
bool DynamicModuleLoader::GetDynamicModuleState()
{
return (bool)m_DynamicModuleState;
}
}
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