Знаю С, написать ничего толкового не могу, нужен совет опытных

HWND hWnd = FindWindow(NULL, "limbo");
DWORD pID;
GetWindowThreadProcessId(hWnd, &pID);
HANDLE hProc = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pID);

int CALLBACK WinMain(
  _In_  HINSTANCE hInstance,
  _In_  HINSTANCE hPrevInstance,
  _In_  LPSTR lpCmdLine,
  _In_  int nCmdShow
);

LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
        case WM_DESTROY:
        {
            PostQuitMessage(0);
            return 0;
        }
    }
    return DefWindowProc(hWnd, message, wParam, lParam);
}

int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    ZeroMemory(&wc, sizeof(WNDCLASSEX));
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor(0, IDC_ARROW);
    wc.lpszClassName = L"WindowClass";
    RegisterClassEx(&wc);
    HWND hWnd = CreateWindowEx(0, L"WindowClass", L"WinForm", WS_SYSMENU | WS_MINIMIZEBOX,
        (GetSystemMetrics(SM_CXSCREEN) - 640) / 2, (GetSystemMetrics(SM_CYSCREEN) - 480) / 2, 640, 480, 0, 0, hInstance, 0);
    ShowWindow(hWnd, nCmdShow);
    MSG msg;
    while (1)
    {
        while (PeekMessage(&msg, 0, 0, 0, 1))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        if (msg.message == WM_QUIT) break;
    }
    return msg.wParam;
}

void label(HWND hWnd)
{
    static HWND hwnd;
    int x, w, y, h;
    y = 10; h = 20;
    x = 10; w = 50;
    hwnd = CreateWindow(L"static", L"",
        WS_CHILD | WS_VISIBLE | WS_TABSTOP,
        x, y, w, h,
        hWnd, (HMENU)(501),
        (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE), NULL);
    SetWindowText(hwnd, L"label");
}

ShowWindow(hWnd, nCmdShow);
label(hWnd);
MSG msg;