please dont rip this site Prev Next

GetWindowLong info  Overview  Group

The GetWindowLong function retrieves information about the specified window. The function also retrieves the 32-bit (long) value at the specified offset into the extra window memory of a window.

LONG GetWindowLong(

    HWND hWnd,

// handle of window

    int nIndex 

// offset of value to retrieve

   );

Parameters

hWnd
Identifies the window and, indirectly, the class to which the window belongs.
nIndex
Specifies the zero-based offset to the value to be retrieved. Valid values are in the range zero through the number of bytes of extra window memory, minus four; for example, if you specified 12 or more bytes of extra memory, a value of 8 would be an index to the third 32-bit integer. To retrieve any other value, specify one of the following values:

Value

Action

GWL_EXSTYLE

Retrieves the extended window styles.

GWL_STYLE

Retrieves the window styles.

GWL_WNDPROC

Retrieves the address of the window procedure, or a handle representing the address of the window procedure. You must use the CallWindowProc function to call the window procedure.

GWL_HINSTANCE

Retrieves the handle of the application instance.

GWL_HWNDPARENT

Retrieves the handle of the parent window, if any.

GWL_ID

Retrieves the identifier of the window.

GWL_USERDATA

Retrieves the 32-bit value associated with the window. Each window has a corresponding 32-bit value intended for use by the application that created the window.

The following values are also available when the hWnd parameter identifies a dialog box:

Value

Action

DWL_DLGPROC

Retrieves the address of the dialog box procedure, or a handle representing the address of the dialog box procedure. You must use the CallWindowProc function to call the dialog box procedure.

DWL_MSGRESULT

Retrieves the return value of a message processed in the dialog box procedure.

DWL_USER

Retrieves extra information private to the application, such as handles or pointers.

Return Values

If the function succeeds, the return value is the requested 32-bit value.

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

Remarks

Reserve extra window memory by specifying a nonzero value in the cbWndExtra member of the WNDCLASS structure used with the RegisterClass function.

See Also

CallWindowProc, GetWindowWord, RegisterClass, SetParent, SetWindowLong, SetWindowWord, WNDCLASS 


file: /Techref/os/win/api/win32/func/src/f42_16.htm, 5KB, , updated: 2000/4/7 11:19, local time: 2024/11/22 19:06,
TOP NEW HELP FIND: 
3.139.67.228:LOG IN

 ©2024 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://ecomorder.com/techref/os/win/api/win32/func/src/f42_16.htm"> GetWindowLong</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?

 

Welcome to ecomorder.com!

 

Welcome to ecomorder.com!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .