Получить координаты мыши и отобразить их

//
// Get Cursor Position
//
// Copyright (c) Карбид
// (_:_)
//
 
#define _WIN32_WINNT 0x0501
#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
 
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    static TCHAR lpszText[64];
    LRESULT retval = 0;
 
    switch( uMsg ) {
    case WM_CREATE:
    {
        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 = hWnd;
        if( RegisterRawInputDevices(Rid, 1, sizeof(Rid[0]))==0 ) {
            MessageBox(hWnd, TEXT("RegisterRawInputDevices"), TEXT("Error"), MB_ICONERROR | MB_OK);
            SendMessage(hWnd, WM_CLOSE, (WPARAM)0, (LPARAM)0);
        }
    }
    break;
 
    case WM_INPUT:
    {
        UINT dwSize = 40;
        static BYTE lpb[40];
        GetRawInputData((HRAWINPUT)lParam, RID_INPUT, lpb, &dwSize, sizeof(RAWINPUTHEADER));
        RAWINPUT* raw = (RAWINPUT*)lpb;
        if( raw->header.dwType == RIM_TYPEMOUSE ) {
            POINT pt;
            GetCursorPos(&pt);
            wsprintf(lpszText, TEXT("X=%04d\nY=%04d"), pt.x, pt.y);
            InvalidateRect(hWnd, NULL, FALSE);
        }
    }
    break;
 
    case WM_PAINT:
    {
    PAINTSTRUCT ps;
    HDC hdc;
    hdc = BeginPaint(hWnd, &ps);
 
    SetTextColor(hdc, RGB(255, 0, 0));
    SetBkColor(hdc, RGB(0, 0, 0));
 
    RECT rc;
    GetClientRect(hWnd, &rc);
 
    int nWidth, nHeight;
    nWidth = rc.right;      // rc.left is 0
    nHeight = rc.bottom;    // rc.top is 0
    rc.left += ( nWidth / 4 );
    rc.top  += ( nHeight / 4 );
    rc.right -= ( nWidth / 4 );
 
    DrawText(hdc, lpszText, -1, &rc, DT_EXTERNALLEADING | DT_NOPREFIX | DT_WORDBREAK);  
 
    EndPaint(hWnd, &ps);
    }
    break;
 
    case WM_CLOSE:
    DestroyWindow(hWnd);
    break;
    case WM_DESTROY:
    PostQuitMessage(0);
    break;
    default:
    retval = DefWindowProc(hWnd, uMsg, wParam, lParam);
    break;
    }
    return retval;
}
 
//
// WinMain: Entry Point.
//
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    HWND hWnd;
    WNDCLASSEX wcex = {
        sizeof(WNDCLASSEX), CS_VREDRAW | CS_HREDRAW, WndProc, 0, 0, hInstance,
        LoadIcon(NULL, IDI_APPLICATION), LoadCursor(NULL, IDC_ARROW),
        (HBRUSH)GetStockObject(BLACK_BRUSH), NULL, TEXT("MYCLASS"), NULL,
    };
    ATOM atom = RegisterClassEx(&wcex);
    if( atom==NULL ) {
        MessageBox(HWND_DESKTOP, TEXT("Cannot register window class!"),
            TEXT("Error"), MB_ICONERROR | MB_OK);
        return 0;
    }
    hWnd = CreateWindowEx(WS_EX_APPWINDOW,
        MAKEINTATOM(atom), TEXT("Get Cursor Position"),
        WS_SYSMENU | WS_CAPTION | WS_MINIMIZEBOX,
        ((GetSystemMetrics(SM_CXSCREEN) - 200) / 2),
        ((GetSystemMetrics(SM_CYSCREEN) - 100) / 2),
        200, 100, HWND_DESKTOP, NULL, hInstance, NULL);
    if( hWnd==NULL ) {
        MessageBox(HWND_DESKTOP, TEXT("Cannot create window!"),
            TEXT("Error"), MB_ICONERROR | MB_OK);
        return 0;
    }
    
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);
 
    MSG msg;
    while( GetMessage(&msg, NULL, 0, 0)>0 ) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int)msg.wParam;
}