Pitfalls in handling the WM_CONTEXTMENU message

Before we continue with our IContextMenu discussion, I need to take a little side trip and discuss the subtleties of the WM_CONTEXTMENU message. First, a correction to the existing <windowsx.h> header file: #undef HANDLE_WM_CONTEXTMENU #define HANDLE_WM_CONTEXTMENU(hwnd, wParam, lParam, fn) \ ((fn)((hwnd), (HWND)(wParam), GET_X_LPAR...