Creating a Window in WinAPI after pressing a button - c++

Question

I'm making an auto clicker for a game in WinAPI and I have 4 simple buttons on the main window. When the user presses the 'start' button I want another window to open asking them for settings such as number of times to click and time between clicks. When I try to create a new window, nothing is happening, but everything else works perfectly.
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DESTROY:
{
PostQuitMessage(0);
return 0;
}
case WM_COMMAND:
{
switch (wParam)
{
case ID_START:
{
HINSTANCE hInstance = GetModuleHandle(CLASS_NAME);
HWND settings = CreateWindowEx(
0,
L"Settings",
L"Settings",
WS_OVERLAPPEDWINDOW | WS_VISIBLE | WS_CHILD,
100, 100, 600, 200,
NULL,
(HMENU) ID_SETTINGS,
hInstance,
NULL
);
MSG msg = { };
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
case ID_QUIT:
{
PostQuitMessage(0);
return 0;
}
case ID_CALIB:
{
if (MessageBox(hwnd, L"You pressed Calibrate", L"Calibrate", MB_OK))
{
return 0;
}
}
case ID_INFO:
{
if (MessageBox(hwnd, L"You pressed about", L"About", MB_OK))
{
return 0;
}
}
}
}
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW+1));
EndPaint(hwnd, &ps);
return 0;
}
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
I just started WinAPI today, so I am extremely new. Thanks for any help in advance!

Answer 1

The second parameter to CreateWindowEx must be a class name that you registered earlier by calling RegisterClass.
You are specifying WS_CHILD. But a child must have a parent. Pass the parent HWND into the hwndParent parameter.