WINDOWPOS structure

Applies to: desktop apps only

Contains information about the size and position of a window.

Syntax

typedef struct tagWINDOWPOS {
  HWND hwnd;
  HWND hwndInsertAfter;
  int  x;
  int  y;
  int  cx;
  int  cy;
  UINT flags;
} WINDOWPOS, *LPWINDOWPOS, *PWINDOWPOS;

Members

hwnd

Type: HWND

A handle to the window.

hwndInsertAfter

Type: HWND

The position of the window in Z order (front-to-back position). This member can be a handle to the window behind which this window is placed, or can be one of the special values listed with the SetWindowPos function.

x

Type: int

The position of the left edge of the window.

y

Type: int

The position of the top edge of the window.

cx

Type: int

The window width, in pixels.

cy

Type: int

The window height, in pixels.

flags

Type: UINT

The window position. This member can be one or more of the following values.

Value	Meaning
SWP_DRAWFRAME 0x0020	Draws a frame (defined in the window's class description) around the window. Same as the SWP_FRAMECHANGED flag.
SWP_FRAMECHANGED 0x0020	Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window's size is being changed.
SWP_HIDEWINDOW 0x0080	Hides the window.
SWP_NOACTIVATE 0x0010	Does not activate the window. If this flag is not set, the window is activated and moved to the top of either the topmost or non-topmost group (depending on the setting of the hwndInsertAfter member).
SWP_NOCOPYBITS 0x0100	Discards the entire contents of the client area. If this flag is not specified, the valid contents of the client area are saved and copied back into the client area after the window is sized or repositioned.
SWP_NOMOVE 0x0002	Retains the current position (ignores the x and y members).
SWP_ NOOWNERZORDER 0x0200	Does not change the owner window's position in the Z order.
SWP_NOREDRAW 0x0008	Does not redraw changes. If this flag is set, no repainting of any kind occurs. This applies to the client area, the nonclient area (including the title bar and scroll bars), and any part of the parent window uncovered as a result of the window being moved. When this flag is set, the application must explicitly invalidate or redraw any parts of the window and parent window that need redrawing.
SWP_NOREPOSITION 0x0200	Does not change the owner window's position in the Z order. Same as the SWP_NOOWNERZORDER flag.
SWP_NOSENDCHANGING 0x0400	Prevents the window from receiving the WM_WINDOWPOSCHANGING message.
SWP_NOSIZE 0x0001	Retains the current size (ignores the cx and cy members).
SWP_NOZORDER 0x0004	Retains the current Z order (ignores the hwndInsertAfter member).
SWP_SHOWWINDOW 0x0040	Displays the window.

 

Requirements

See also

Reference

EndDeferWindowPos

SetWindowPos

WM_NCCALCSIZE

Conceptual

Windows

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Build date: 2/3/2012