#include <string>

#include <atlbase.h>
#include <atlwin.h>

class Window : public CWindowImpl<Window>
{
private:
	struct TimerContext {
		std::wstring msg;
	};

protected:
	LRESULT OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled) {
		TimerContext* pCtx = new TimerContext;
		pCtx->msg = L"Timer context message";

		// 注意到，我直接把指针设置成定时器的ID
		SetTimer(UINT_PTR(pCtx), 5000);

		bHandled = FALSE;
		return 0;
	}

	LRESULT OnTimer(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled) {
		// 实际上，我们的定时器ID是一个指针值
		TimerContext* pCtx = reinterpret_cast<TimerContext*>(wParam);

		// 清除定时器
		KillTimer(UINT_PTR(pCtx));

		MessageBox(pCtx->msg.c_str());

		delete pCtx;

		return 0;
	}

	LRESULT OnDestroy(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled) {
		::PostQuitMessage(0);
		return 0;
	}

private:
	BEGIN_MSG_MAP(Window)
		MESSAGE_HANDLER(WM_TIMER, OnTimer)
		MESSAGE_HANDLER(WM_CREATE, OnCreate)
		MESSAGE_HANDLER(WM_DESTROY, OnDestroy)
	END_MSG_MAP()
};

int __stdcall wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR lpCmdLine, int nShowCmd) {
	Window wnd;
	wnd.Create(nullptr, nullptr, nullptr, WS_OVERLAPPEDWINDOW);
	wnd.ShowWindow(SW_SHOWNORMAL);

	MSG msg;
	while (GetMessage(&msg, nullptr, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return (int)msg.wParam;
}