Win32 Mouse Raw Input using wxWidgets for output

wx_mouseraw.cpp

#include <wx/wxprec.h>

#ifndef WX_PRECOMP
	#include <wx/wx.h>
#endif

#define NOMINMAX
#define WIN32_LEAN_AND_MEAN
#define VC_EXTRALEAN
#include <Windows.h>

#ifndef HID_USAGE_PAGE_GENERIC
#define HID_USAGE_PAGE_GENERIC USHORT(0x01)
#endif

#ifndef HID_USAGE_GENERIC_MOUSE
#define HID_USAGE_GENERIC_MOUSE USHORT(0x02)
#endif

class Frame : public wxFrame {
public:
	wxStaticText* text;
	wxTimer* timer;
	struct {
		long x, y, wheel;
	} mousedelta;

	Frame() : 
	wxFrame(
		nullptr,
		wxID_ANY,
		"",
		wxDefaultPosition,
		{85, 103},
		wxCAPTION | wxCLOSE_BOX | wxSTAY_ON_TOP
	) {
		auto main_sizer = new wxBoxSizer(wxVERTICAL);
		
		text = new wxStaticText(
			this,
			wxID_ANY,
			"0",
			wxDefaultPosition,
			wxDefaultSize,
			0
		);
		text->SetFont(wxFont(12, wxFONTFAMILY_TELETYPE, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL));
		main_sizer->Add(text, 0, wxALL | wxEXPAND, 5);
		
		SetSizer(main_sizer);
		Center();

		timer = new wxTimer(this);
		timer->Start(30);
		Bind(wxEVT_TIMER, &Frame::OnUpdate, this, timer->GetId());

		RAWINPUTDEVICE rid[1];
		rid[0].usUsagePage = HID_USAGE_PAGE_GENERIC;
		rid[0].usUsage = HID_USAGE_GENERIC_MOUSE;
		rid[0].dwFlags = RIDEV_INPUTSINK;
		rid[0].hwndTarget = GetHWND();
		RegisterRawInputDevices(rid, 1, sizeof(rid[0]));
	}

	~Frame() {
		delete text;
		delete timer;
	}

	void OnUpdate(wxTimerEvent& e) {
		wxString str = "X:     ";
		str << mousedelta.x;
		str << "\nY:     " << mousedelta.y;
		str << "\nWheel: " << mousedelta.wheel;

		text->SetLabel(str);

		mousedelta.x = mousedelta.y = mousedelta.wheel = 0;
	}

	WXLRESULT MSWWindowProc(WXUINT message, WXWPARAM wparam, WXLPARAM lparam) {
		if (message == WM_INPUT) {
			unsigned size = sizeof(RAWINPUT);
			static RAWINPUT raw[sizeof(RAWINPUT)];
			GetRawInputData((HRAWINPUT)lparam, RID_INPUT, raw, &size, sizeof(RAWINPUTHEADER));

			if (raw->header.dwType == RIM_TYPEMOUSE) {
				mousedelta.x = raw->data.mouse.lLastX;
				mousedelta.y = raw->data.mouse.lLastY;

				if (raw->data.mouse.usButtonFlags & RI_MOUSE_WHEEL)
					mousedelta.wheel = static_cast<short>(raw->data.mouse.usButtonData) / WHEEL_DELTA;
			}

			return 0;
		}

		return wxFrame::MSWWindowProc(message, wparam, lparam);
	}
};

class Main : public wxApp {
public:
	Frame* frame;

	bool OnInit() {
		frame = new Frame();
		frame->Show();
		return true;
	}
};

wxIMPLEMENT_APP(Main);