This message is sent after the size of a window has changed.
wParam
Contains a value that defines the type of resizing requested. It can be one of the following values:
| Value | Description |
| SIZEFULLSCREEN | Window has been maximized. |
| SIZEICONIC | Window has been minimized. |
| SIZENORMAL | Window has been resized, but neither SIZEICONIC nor SIZEFULLSCREEN applies. |
| SIZEZOOMHIDE | Message is sent to all pop-up windows when some other window is maximized. |
| SIZEZOOMSHOW | Message is sent to all pop-up windows when some other window has been restored to its former size. |
lParam
Contains the new width and height of the client area of the window. The width is in the low-order word; the height is in the high-order word.
If the SetScrollPos or MoveWindow function is called for a child window as a result of the WM_SIZE message, the bRedraw parameter should be nonzero to cause the window to be repainted.
MoveWindow, SetScrollPos