win_shared_object_loader.h

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 // Copyright (C) 2018-2019 Intel Corporation


 // SPDX-License-Identifier: Apache-2.0


 //


 


 /**


  * @brief WINAPI compatible loader for a shared object


  * @file win_shared_object_loader.h


  */


 #pragma once


 

 #include "../../ie_api.h"


 #include "../ie_exception.hpp"


 

 // Avoidance of Windows.h to include winsock library.


 #define _WINSOCKAPI_


 // Avoidance of Windows.h to define min/max.


 #ifndef NOMINMAX


 #define NOMINMAX


 #endif


 #include <direct.h>


 #include <windows.h>


 

 namespace InferenceEngine {

 namespace details {

 


 /**


  * @brief This class provides an OS shared module abstraction


  */


 class SharedObjectLoader {

 private:

     HMODULE shared_object;

 

 public:


     /**


      * @brief Loads a library with the name specified. The library is loaded according to the


      *        WinAPI LoadLibrary rules


      * @param pluginName Full or relative path to the plugin library


      */


     explicit SharedObjectLoader(LPCTSTR pluginName) {

         char cwd[1024];

         // Exclude current directory from DLL search path process wise.


         // If application specific path was configured before then


         // current directory is alread excluded.


         // GetDLLDirectory does not distinguish if aplication specific


         // path was set to "" or NULL so reset it to "" to keep


         // aplication safe.


         if (GetDllDirectory(0, NULL) <= 1) {

             SetDllDirectory(

 #if defined UNICODE

                 L"");

 #else


                 "");

 #endif


         }

         shared_object = LoadLibrary(pluginName);

         if (!shared_object) {

             THROW_IE_EXCEPTION << "Cannot load library '" << pluginName << "': " << GetLastError()

                                << " from cwd: " << _getcwd(cwd, 1024);

         }

     }

     ~SharedObjectLoader() {

         FreeLibrary(shared_object);

     }

 


     /**


      * @brief Searches for a function symbol in the loaded module


      * @param symbolName Name of function to find


      * @return A pointer to the function if found


      * @throws InferenceEngineException if the function is not found


      */


     void* get_symbol(const char* symbolName) const {

         if (!shared_object) {

             THROW_IE_EXCEPTION << "Cannot get '" << symbolName << "' content from unknown library!";

         }

         auto procAddr = reinterpret_cast<void*>(GetProcAddress(shared_object, symbolName));

         if (procAddr == nullptr)

             THROW_IE_EXCEPTION << "GetProcAddress cannot locate method '" << symbolName << "': " << GetLastError();

 

         return procAddr;

     }

 };

 

 }  // namespace details


 }  // namespace InferenceEngine