malte_langkabel
054b8fab17
* use canonical filepath cache in cxx indexer * made constructors of FilePath explicit * use FilePath at more places instead of string * forward declares FilePath wherever possible
69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
#ifndef UTILITY_LIBRARY_H
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#define UTILITY_LIBRARY_H
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#include <iostream>
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#include <functional>
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#include <sstream>
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#include <string>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <dlfcn.h>
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#define __stdcall
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#endif
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#include "utility/file/FilePath.h"
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namespace utility
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{
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template <typename Ret, typename... Args>
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std::function<Ret(Args...)> loadFunctionFromLibrary(
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const FilePath& libraryPath,
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const std::string& functionName,
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std::string& errorString)
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{
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#ifdef _WIN32
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const std::string libraryPathString = libraryPath.getBackslashedString();
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HINSTANCE handle = LoadLibrary(libraryPathString.c_str());
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if (handle == NULL)
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{
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errorString = "Could not load library \"" + libraryPathString + "\"";
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return std::function<Ret(Args...)>();
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}
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FARPROC functionId = GetProcAddress(handle, functionName.c_str());
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if (!functionId)
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{
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errorString = "Could not locate the function \"" + functionName
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+ "\" in library\"" + libraryPathString + "\"";
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return std::function<Ret(Args...)>();
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}
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#else
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void* handle = dlopen(libraryPath.str().c_str(), RTLD_LAZY);
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if (handle == nullptr)
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{
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errorString = "Could not load library \"" + libraryPath.str() + "\"";
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return std::function<Ret(Args...)>();
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}
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void* functionId = (void*) dlsym(handle, functionName.c_str());
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const char *dlsym_error = dlerror();
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if (dlsym_error || !functionId)
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{
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std::stringstream ss;
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ss << "Cannot load symbol '" << functionName << "' from library '" << libraryPath.str() << "': " << dlsym_error;
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errorString = ss.str();
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dlclose(handle);
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return std::function<Ret(Args...)>();
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}
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#endif
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return std::function<Ret(Args...)>(reinterpret_cast<Ret (__stdcall *)(Args...)>(functionId));
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}
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}
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#endif // UTILITY_LIBRARY_H
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