afb81b8278
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67 lines
1.3 KiB
C++
67 lines
1.3 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include <crl/common/crl_common_config.h>
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#ifdef CRL_USE_WINAPI
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#include <exception>
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#include <crl/winapi/crl_winapi_windows_h.h>
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namespace crl::details {
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class dll {
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public:
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enum class own_policy {
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owner,
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load_and_leak,
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use_existing,
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};
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dll(LPCWSTR library, own_policy policy)
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: _handle((policy == own_policy::use_existing)
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? GetModuleHandle(library)
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: LoadLibrary(library))
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, _policy(policy) {
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}
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template <typename Function>
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bool try_load(Function &function, const char *name) const {
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if (!_handle) {
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return false;
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}
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function = reinterpret_cast<Function>(GetProcAddress(_handle, name));
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return (function != nullptr);
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}
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template <typename Function>
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void load(Function &function, const char *name) const {
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if (!try_load(function, name)) {
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Failed();
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}
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}
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~dll() {
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if (_handle && _policy == own_policy::owner) {
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FreeLibrary(_handle);
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}
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}
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private:
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[[noreturn]] static void Failed() {
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std::terminate();
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}
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HMODULE _handle = nullptr;
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own_policy _policy = own_policy::use_existing;
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};
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} // namespace crl::details
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#endif // CRL_USE_WINAPI
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