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Restricting window size


Handle WM_GETMINMAXINFO, LPARAM of this message points to a MINMAXINFO structure. Fill out necessary information into this structure like minimum and maximum tracking size, maximum position, maximum size.

If you’ve handled and filled out necessary information then return FALSE to so that the changes get’s applied.

If you are using MFC then add a message map entry for ON_WM_GETMINMAXINFO,


// then provide a function whose signature is likewise...
// Declaration
void OnGetMinMaxInfo(MINMAXINFO* MinMaxInfo);

// Implementation will look something like this, I am here restricting minimum size...
void CWnd::OnGetMinMaxInfo(MINMAXINFO* MinMaxInfo)
  MinMaxInfo->ptMinTrackSize.x = GetSystemMetrics( SM_CXSCREEN )/4;
  MinMaxInfo->ptMinTrackSize.y = GetSystemMetrics( SM_CYSCREEN )/4;
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