please dont rip this site Prev Next

RedrawWindow info  Overview  Group

The RedrawWindow function updates the specified rectangle or region in a window’s client area.

BOOL RedrawWindow(

    HWND hWnd,

// handle of window

    CONST RECT *lprcUpdate,

// address of structure with update rectangle

    HRGN hrgnUpdate,

// handle of update region

    UINT flags 

// array of redraw flags

   );

Parameters

hWnd
Identifies the window to be redrawn. If this parameter is NULL, the desktop window is updated.
lprcUpdate
Points to a RECT structure containing the coordinates of the update rectangle. This parameter is ignored if the hrgnUpdate parameter identifies a region.
hrgnUpdate
Identifies the update region. If both the hrgnUpdate and lprcUpdate parameters are NULL, the entire client area is added to the update region.
flags
Specifies one or more redraw flags. This parameter can be a combination of flags that invalidate or validate a window, control repainting, and control which windows are affected by RedrawWindow.

The following flags are used to invalidate the window:

Flag (invalidation)

Description

RDW_ERASE

Causes the window to receive a WM_ERASEBKGND message when the window is repainted. The RDW_INVALIDATE flag must also be specified; otherwise, RDW_ERASE has no effect.

RDW_FRAME

Causes any part of the nonclient area of the window that intersects the update region to receive a WM_NCPAINT message. The RDW_INVALIDATE flag must also be specified; otherwise, RDW_FRAME has no effect. The WM_NCPAINT message is typically not sent during the execution of RedrawWindow unless either RDW_UPDATENOW or RDW_ERASENOW is specified.

RDW_INTERNALPAINT

Causes a WM_PAINT message to be posted to the window regardless of whether any portion of the window is invalid.

RDW_INVALIDATE

Invalidates lprcUpdate or hrgnUpdate (only one may be non-NULL). If both are NULL, the entire window is invalidated.

The following flags are used to validate the window:

Flag (validation)

Description

RDW_NOERASE

Suppresses any pending WM_ERASEBKGND messages.

RDW_NOFRAME

Suppresses any pending WM_NCPAINT messages. This flag must be used with RDW_VALIDATE and is typically used with RDW_NOCHILDREN. RDW_NOFRAME should be used with care, as it could cause parts of a window to be painted improperly.

RDW_NOINTERNALPAINT

Suppresses any pending internal WM_PAINT messages. This flag does not affect WM_PAINT messages resulting from a non-NULL update area.

RDW_VALIDATE

Validates lprcUpdate or hrgnUpdate (only one may be non-NULL). If both are NULL, the entire window is validated. This flag does not affect internal WM_PAINT messages.

The following flags control when repainting occurs. RedrawWindow will not repaint unless one of these flags is specified.

Flag

Description

RDW_ERASENOW

Causes the affected windows (as specified by the RDW_ALLCHILDREN and RDW_NOCHILDREN flags) to receive WM_NCPAINT and WM_ERASEBKGND messages, if necessary, before the function returns. WM_PAINT messages are received at the ordinary time.

RDW_UPDATENOW

Causes the affected windows (as specified by the RDW_ALLCHILDREN and RDW_NOCHILDREN flags) to receive WM_NCPAINT, WM_ERASEBKGND, and WM_PAINT messages, if necessary, before the function returns.

By default, the windows affected by RedrawWindow depend on whether the given window has the WS_CLIPCHILDREN style. Child windows that are not the WS_CLIPCHILDREN style are unaffected; non-WS_CLIPCHILDREN windows are recursively validated or invalidated until a WS_CLIPCHILDREN window is encountered. The following flags control which windows are affected by the RedrawWindow function:

Flag

Description

RDW_ALLCHILDREN

Includes child windows, if any, in the repainting operation.

RDW_NOCHILDREN

Excludes child windows, if any, from the repainting operation.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

When RedrawWindow is used to invalidate part of the desktop window, the desktop window does not receive a WM_PAINT message. To repaint the desktop, an application uses the RDW_ERASE flag to generate a WM_ERASEBKGND message.

See Also

GetUpdateRect, GetUpdateRgn, InvalidateRect, InvalidateRgn, RECT, UpdateWindow

See also:


file: /Techref/os/win/api/win32/func/src/f72.htm, 8KB, , updated: 2000/4/7 12:19, local time: 2022/5/17 06:36,
TOP NEW HELP FIND: 
34.204.174.110:LOG IN

 ©2022 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF="http://www.piclist.com/techref/os/win/api/win32/func/src/f72.htm"> RedrawWindow</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2022 contributors:
o List host: MIT, Site host massmind.org, Top posters @20220517
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
 

Welcome to www.piclist.com!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .