Can I lock the width or height of an MFC dialog during resizing?

Question

Is there a way to lock a dialog box's size in one direction (restrict only width or only height) in MFC?

Answer 1

You need to override OnGetMinMaxInfo. In OnInitDialog you can capture the current height, and then use it for both minimum and maximum height. Call __super::OnGetMinMaxInfo first and then only change the height members. Note that the window may not exist the first couple times OnGetMinMaxInfo are called.

Here's a detailed article on GetMinMaxInfo.