minimal classic win32 application

main.cpp

#include <Windows.h>
#include <cstdint>

inline LRESULT CALLBACK main_window_proc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
	if (message == WM_CREATE) {
		::OutputDebugStringW(L"WM_CREATE\n");
	}

	if (message == WM_PAINT) {
		::OutputDebugStringW(L"WM_PAINT\n");
	}

	if (message == WM_DESTROY) {
		::OutputDebugStringW(L"WM_DESTROY\n");
		::PostQuitMessage(EXIT_SUCCESS);
	}

	/// DefWindowProcW calls DestroyWindow(), which sends WM_DESTROY by default
	return ::DefWindowProcW(hWnd, message, wParam, lParam);
}

int WINAPI wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPWSTR lpCmdLine, _In_ int nShowCmd) try {
	static const WNDCLASSEXW wnd_class {
		.cbSize = sizeof(WNDCLASSEXW),
		.style = CS_HREDRAW | CS_VREDRAW,
		.lpfnWndProc = &main_window_proc,
		.cbClsExtra = 0,
		.cbWndExtra = sizeof(std::uintptr_t),
		.hInstance = ::GetModuleHandle(NULL),
		.hIcon = NULL,
		.hCursor = ::LoadCursorW(NULL, IDC_ARROW),
		.hbrBackground = NULL,
		.lpszMenuName = NULL,
		.lpszClassName = L"main_window",
		.hIconSm = NULL
	};
	const ATOM cls = ::RegisterClassExW(&wnd_class);

	HWND hWnd = ::CreateWindowEx(0, MAKEINTRESOURCEW(cls), L"Main Window", WS_OVERLAPPEDWINDOW | WS_VISIBLE,
		CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, nullptr);

	MSG msg;
	BOOL bRet;
	while ((bRet = ::GetMessage(&msg, NULL, 0, 0)) != 0) {
		::TranslateMessage(&msg);
		::DispatchMessage(&msg);
	}

	return static_cast<int>(msg.wParam);
} catch (...) {
}