[WinAPI] Pobranie pozycji kursora myszy

#include <windows.h>
#include <windowsx.h>
#include <iostream>

using namespace std;

LPSTR NazwaKlasy = "Klasa Okienka";
MSG Komunikat;
LRESULT CALLBACK proc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam );


int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow )
{
   
    WNDCLASSEX wc;
   
    wc.cbSize = sizeof( WNDCLASSEX );
    wc.style = CS_DBLCLKS;
    wc.lpfnWndProc = proc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
    wc.hCursor = LoadCursor( NULL, IDC_ARROW );
    wc.hbrBackground =( HBRUSH )( COLOR_WINDOW + 1 );
    wc.lpszMenuName = NULL;
    wc.lpszClassName = NazwaKlasy;
    wc.hIconSm = LoadIcon( NULL, IDI_APPLICATION );
   
    HWND hwnd;
    hwnd = CreateWindowEx( WS_EX_CLIENTEDGE, NazwaKlasy, "Oto okienko", WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT, CW_USEDEFAULT, 240, 120, NULL, NULL, hInstance, NULL );
   
    ShowWindow( hwnd, nCmdShow );
    UpdateWindow( hwnd );
    while( GetMessage( & Komunikat, NULL, 0, 0 ) )
    {
        TranslateMessage( & Komunikat );
        DispatchMessage( & Komunikat );
    }
    return 0;
   
}
LRESULT CALLBACK proc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    POINT point;
    GetCursorPos( & point );
    HDC dc = GetDC( NULL );
    COLORREF color = GetPixel( dc, point.x, point.y );
    ReleaseDC( NULL, dc );
    cout << point.x << "|" << point.y << "|" << color << endl;
    switch( msg )
    {
    case WM_CLOSE:
        DestroyWindow( hwnd );
        break;
       
    case WM_DESTROY:
        PostQuitMessage( 0 );
        break;
       
    case WM_MOUSEMOVE:
        {
        }
       
        default:
        return DefWindowProc( hwnd, msg, wParam, lParam );
    }
    return 0;
}