I have realised after so long of coding DirectX/OpenGL applications I don't have the faintest of ideas how to create windows with basic form objects like text boxes, labels, command buttons etc.
I can create a window using the CreateWindow
function just fine, how can I add buttons, command prompts and other form objects to it?
Look at Create Window Help. Once you create your main window you can create child windows by providing the parent HWND to the function. For standard controls you use one of the class names defined at the button, like EDIT for an edit box and BUTTON for a button.
As an example:
CreateWindow(L"BUTTON", L"Button", BS_TEXT | WS_CHILD | WS_VISIBLE, 40, 40, 100, 40, hMainWnd, (HMENU)ID_MYBUTTON, hInstance, NULL);
Or you could just create a dialog box instead and edit it with Visual Studio's resource editor (if you have full VS that is).