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110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
#ifndef DLHANDLE_H
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#define DLHANDLE_H
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#ifndef _WIN32
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#include <string>
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#include <stdexcept>
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#include <utility>
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#include <dlfcn.h>
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class Dlhandle {
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void *chandle;
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public:
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class Exception : public std::runtime_error {
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public:
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using std::runtime_error::runtime_error;
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};
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Dlhandle() : chandle(nullptr) {}
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Dlhandle(const std::string& fpath, int flags = RTLD_LAZY | RTLD_LOCAL) {
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chandle = dlopen(fpath.c_str(), flags);
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if (!chandle) {
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throw Exception("dlopen(\""+fpath+"\"): "+dlerror());
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}
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}
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Dlhandle(const Dlhandle& o) = delete;
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Dlhandle(Dlhandle&& o) : chandle(o.chandle) {
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o.chandle = nullptr;
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}
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~Dlhandle() {
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if (chandle) dlclose(chandle);
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}
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auto operator =(Dlhandle&& o) {
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chandle = std::exchange(o.chandle, nullptr);
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}
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bool is_valid() const {
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return chandle != nullptr;
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}
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operator bool() const {
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return is_valid();
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}
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template<typename T>
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T* get(const std::string& fname) const {
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auto fres = reinterpret_cast<T*>(dlsym(chandle, fname.c_str()));
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return (dlerror()==NULL)?fres:nullptr;
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}
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auto get_fnc(const std::string& fname) const {
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return get<void*(...)>(fname);
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}
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};
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#else
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#include <algorithm>
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#include <filesystem>
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#include <string>
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#include <exception>
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#include <stdexcept>
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#define WIN32_LEAN_AND_MEAN
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#ifndef NOMINMAX
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# define NOMINMAX
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#endif
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#include <windows.h>
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#include <libloaderapi.h>
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class Dlhandle {
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HMODULE chandle;
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public:
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class Exception : public std::runtime_error {
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public:
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using std::runtime_error::runtime_error;
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};
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Dlhandle() : chandle(nullptr) {}
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Dlhandle(const std::string& fpath) {
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std::string afpath = std::filesystem::absolute(fpath).string();
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std::replace(afpath.begin(), afpath.end(), '/', '\\');
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chandle = LoadLibraryExA(afpath.c_str(), NULL, LOAD_LIBRARY_SEARCH_DEFAULT_DIRS | LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR);
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if (!chandle) {
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throw Exception("dlopen(\""+fpath+"\"): Error");
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}
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}
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Dlhandle(const Dlhandle& o) = delete;
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Dlhandle(Dlhandle&& o) : chandle(o.chandle) {
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o.chandle = nullptr;
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}
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~Dlhandle() {
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if (chandle) FreeLibrary(chandle);
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}
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bool is_valid() const {
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return chandle != nullptr;
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}
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template<typename T>
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T* get(const std::string& fname) const {
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return reinterpret_cast<T*>(GetProcAddress(chandle, fname.c_str()));
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}
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auto get_fnc(const std::string& fname) const {
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return get<void*(...)>(fname);
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}
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};
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#endif
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#endif // DLHANDLE_H
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