最小化 最大化

// システムコマンド

::PostMessage(hwnd, WM_SYSCOMMAND, SC_CLOSE, 0);

::PostMessage(hwnd, WM_SYSCOMMAND, SC_MAXIMIZE, 0);

::PostMessage(hwnd, WM_SYSCOMMAND, SC_MINIMIZE, 0);

::PostMessage(hwnd, WM_SYSCOMMAND, SC_RESTORE, 0);

::PostMessage(hwnd, WM_SYSCOMMAND, SC_SCREENSAVE, 0);