02. 画笔画刷和弹出菜单

static HMENU hMenu=nullptr;
    case WM_CREATE: {
        hMenu = LoadMenu(GetModuleHandle(nullptr), MAKEINTRESOURCE(IDR_MENU1));
        hMenu = GetSubMenu(hMenu, 0);
        break;
    }
    case WM_RBUTTONUP: {
        int nX = GET_X_LPARAM(lParam);
        int nY = GET_Y_LPARAM(lParam);
        POINT pt = { nX,nY };
        ClientToScreen(hWnd, &pt);
        TrackPopupMenu(hMenu, TPM_LEFTALIGN, pt.x, pt.y, 0, hWnd, nullptr); 
        break;
    }