Prevent exiting maximized window mode

Question

I'm writing window managing code in C. When certain flags are set, I want to have a maximized window that cannot be resized by dragging the window by the title bar. Is there a way to 'lock' a maximized window in its maximized state?

Answer 1

Try this

case WM_SYSCOMMAND:
    if(IsMaximized(hwnd) && ((wParam & 0xFFF0) == SC_RESTORE || (wParam & 0xFFF0) == SC_MOVE)){
        return 0;
    }

    break;

Edit

The complete code

switch(message){ //handle the messages
    ...
    ...
    case WM_SYSCOMMAND:
        ...
        break;
    ....
    default:   //for messages that we don't deal with
        return DefWindowProc(hwnd, message, wParam, lParam);
}

return DefWindowProc(hwnd, message, wParam, lParam);

This is the default WindowProcedure. I thought it was known.

valter