please dont rip this site Prev Next

RegOpenKey info  Overview  Group

The RegOpenKey function opens the specified key. This function is provided for compatibility with Windows version 3.1. Win32-based applications should use the RegOpenKeyEx function.

LONG RegOpenKey(

    HKEY hKey,

// handle of open key

    LPCTSTR lpSubKey,

// address of name of subkey to open

    PHKEY phkResult 

// address of handle of open key



Identifies a currently open key or any of the following predefined reserved handle values:

Windows NT only:
Windows 95 only: HKEY_DYN_DATA 

The key opened by the RegOpenKey function is a subkey of the key identified by hKey.

Points to a null-terminated string containing the name of the key to open. This key must be a subkey of the key identified by the hKey parameter. If this parameter is NULL or a pointer to an empty string, the function returns the same handle that was passed in.
Points to a variable that receives the handle of the opened key.

Return Values

If the function succeeds, the return value is ERROR_SUCCESS.

If the function fails, the return value is a nonzero error code defined in WINERROR.H. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic description of the error.


The RegOpenKey function uses the default security access mask to open a key. If opening the key requires a different mask, the function fails, returning ERROR_ACCESS_DENIED. An application should use the RegOpenKeyEx function to specify an access mask in this situation.

Unlike the RegCreateKey function, RegOpenKey does not create the specified key if the key does not exist in the database.

See Also

RegCloseKey, RegCreateKey, RegCreateKeyEx, RegDeleteKey, RegOpenKeyEx 

file: /Techref/os/win/api/win32/func/src/f73_3.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2024/7/20 08:01,

 ©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=""> RegOpenKey</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 2024 contributors:
o List host: MIT, Site host, Top posters @none found
- 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!