WM_GETMINMAXINFO message

Sent to a window when the size or position of the window is about to change. An application can use this message to override the window's default maximized size and position, or its default minimum or maximum tracking size.

A window receives this message through its WindowProc function.

#define WM_GETMINMAXINFO                0x0024

wParam

This parameter is not used.

lParam

A pointer to a MINMAXINFO structure that contains the default maximized position and dimensions, and the default minimum and maximum tracking sizes. An application can override the defaults by setting the members of this structure.

Type: LRESULT

If an application processes this message, it should return zero.

The maximum tracking size is the largest window size that can be produced by using the borders to size the window. The minimum tracking size is the smallest window size that can be produced by using the borders to size the window.

Reference

MoveWindow

SetWindowPos

MINMAXINFO

Conceptual

Windows