[PIU] Położenie Okna + Nowe Okno v2

#include <Windows.h>
#include <stdio.h>
//-------Zmienne i funkcje globalne.
//-------Zmienne globalne.
TCHAR EndCaption[] = TEXT("Zamykanie aplikacji");
TCHAR EndText[] = TEXT("Czy chcesz zamknąć aplikację?");
TCHAR WindowText[] = TEXT("Nowa nazwa okna");
TCHAR Class_Name[] = TEXT("KLASA");

HWND NoweOkno;

int windowCount = 0;
RECT rect;
int W, S;

//Komunikaty
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    switch (msg)
    {
    case WM_PAINT:
    {
        PAINTSTRUCT ps;
        hdc = BeginPaint(hwnd, &ps);
        GetClientRect(hwnd, &rect);

        const size_t text_size = 64;

        TCHAR text[64];
        TCHAR text2[64];


        swprintf(text, text_size, TEXT("Rozmiar okna: %i, %i"), rect.right, rect.bottom);
        swprintf(text2, text_size, TEXT("Pozycja: %i x %i "), W, S);

        SetTextColor(hdc, RGB(0, 0, 255));
        SetBkColor(hdc, RGB(255,255, 255));

        TextOut(hdc, 5, 5, text, wcslen(text));
        TextOut(hdc, 5, 50, text2, wcslen(text2));



        //DrawText(hdc, TEXT("TEKST NA ŚRODKU NA GÓRZE"), -1, &rect, DT_SINGLELINE | DT_CENTER);
        //DrawText(hdc, TEXT("TEKST Z LEWEJ STRONY OKNA"), -1, &rect, DT_SINGLELINE | DT_LEFT | DT_VCENTER);
        //DrawText(hdc, TEXT("TEKST NA ŚRODKU OKNA"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
        //DrawText(hdc, TEXT("TEKST Z PRAWEJ STRONY OKNA"), -1, &rect, DT_SINGLELINE | DT_RIGHT | DT_VCENTER);
        //DrawText(hdc, TEXT("TEKST NA ŚRODKU NA DOLE"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_BOTTOM);
        EndPaint(hwnd, &ps);
        break;
    }

    case WM_LBUTTONDOWN:
        hdc = GetDC(hwnd);
        NoweOkno = CreateWindowEx(0, Class_Name, TEXT("Nowe Okno"), WS_OVERLAPPEDWINDOW, 100, 100, 500, 300, 0, 0, GetModuleHandle(0), 0);
        ShowWindow(NoweOkno, SW_SHOW);
        UpdateWindow(NoweOkno);
        //SetWindowText(hwnd, WindowText);
        ReleaseDC(hwnd, hdc);
        break;

    case WM_CREATE:
        ++windowCount;
        UpdateWindow(hwnd);
        break;

    case WM_SIZE:
        InvalidateRect(hwnd, &rect, 1);
        break;

    case WM_MOVE:
        InvalidateRect(hwnd, &rect, 1);
        W = LOWORD(lParam);
        S = HIWORD(lParam);
        break;

    case WM_CLOSE:
        if (MessageBox(hwnd, EndText, EndCaption, MB_YESNO) == IDYES) {
            windowCount--;
            DestroyWindow(hwnd);
        }
        break;

    case WM_DESTROY:
        if (windowCount == 0)
        {
            MessageBox(0, TEXT("Koniec."), TEXT(""), MB_OK);
            PostQuitMessage(0);
        }
        break;

    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
        break;
    }

    return 0;
}

//Main
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR ilCmdLine, int nCmdShow)
{
    WNDCLASSEX window;
    HWND okno1 = NULL;
    HWND okno2 = NULL;
    MSG msg;
    TCHAR Title[] = TEXT("Typowa Aplikacja WinAPI");

    window.cbClsExtra = NULL;
    window.cbSize = sizeof(WNDCLASSEX);
    window.cbWndExtra = NULL;
    window.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    window.hCursor = LoadCursor(NULL, IDC_ARROW);
    window.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    window.hIconSm = NULL;
    window.hInstance = hInstance;
    window.lpfnWndProc = WndProc;
    window.lpszClassName = Class_Name;
    window.lpszMenuName = 0;
    window.style = CS_VREDRAW | CS_HREDRAW;

    if (!RegisterClassEx(&window))
    {
        MessageBox(NULL, TEXT("Nie udało się zarejestrować klasy okna!"), Class_Name, MB_ICONERROR);
        return 0;
    }

    okno1 = ((CreateWindowEx(WS_EX_WINDOWEDGE, Class_Name, Title,
        WS_OVERLAPPEDWINDOW | WS_VISIBLE, 100, 100, 500, 300, 0, 0, hInstance, NULL)));
    ShowWindow(okno1, nCmdShow);
    UpdateWindow(okno1);

    okno2 = ((CreateWindowEx(WS_EX_WINDOWEDGE, Class_Name, Title,
        WS_OVERLAPPEDWINDOW | WS_VISIBLE, 100, 100, 500, 300, 0, 0, hInstance, NULL)));

    ShowWindow(okno2, nCmdShow);
    UpdateWindow(okno2);

    while (GetMessage(&msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    UnregisterClass(Class_Name, hInstance);
    return msg.wParam;
}