%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Name:        regkey.tex
%% Purpose:     wxRegKey docs
%% Author:      Ryan Norton <wxprojects@comcast.net>, C.C.Chakkaradeep
%% Modified by:
%% Created:     2/5/2005
%% RCS-ID:      $Id$
%% Copyright:   (c) Ryan Norton (C.C.Chakkaradeep?)
%% License:     wxWindows license
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\section{\class{wxRegKey}}\label{wxregkey}

wxRegKey is a class representing the Windows registry. One can create, query and delete registry keys using this class.

The Windows registry is easy to understand. There are five registry keys, namely:

\begin{enumerate}\itemsep=0pt
\item HKEY\_CLASSES\_ROOT (HKCR)
\item HKEY\_CURRENT\_USER (HKCU)
\item HKEY\_LOCAL\_MACHINE (HKLM)
\item HKEY\_CURRENT\_CONFIG (HKCC)
\item HKEY\_USERS (HKU)
\end{enumerate}

After creating a key, it can hold a value. The values can be:

\begin{enumerate}\itemsep=0pt
\item String Value
\item Binary Value
\item DWORD Value
\item Multi String Value
\item Expandable String Value
\end{enumerate}

\wxheading{Derived from}

None

\wxheading{Include files}

<wx/config.h>

\wxheading{Example}

\begin{verbatim}
wxRegKey *pRegKey = new wxRegKey("HKEY_LOCAL_MACHINE\\Software\\MyKey");

//will create the Key if it does not exist
if( !pRegKey->Exists() )
    pRegKey->Create();

//will create a new value MYVALUE and set it to 12
pRegKey->SetValue("MYVALUE",12);

//Query for the Value and Retrieve it
long lMyVal;
wxString strTemp;
pRegKey->QueryValue("MYVALUE",&lMyVal); 
strTemp.Printf("%d",lMyVal);
wxMessageBox(strTemp,"Registry Value",0,this);

//Retrive the number of SubKeys and enumerate them
size_t nSubKeys;
pRegKey->GetKeyInfo(&nSubKeys,NULL,NULL,NULL);

pRegKey->GetFirstKey(strTemp,1);
for(int i=0;i<nSubKeys;i++)
{
     wxMessageBox(strTemp,"SubKey Name",0,this);
     pRegKey->GetNextKey(strTemp,1);
}
\end{verbatim}

\latexignore{\rtfignore{\wxheading{Members}}}

\membersection{wxRegKey::wxRegKey}\label{wxregkeyctor}

\func{}{wxRegKey}{\void}

The Constructor to set to HKCR

\func{}{wxRegKey}{\param{const wxString\&}{ strKey}}

The constructor to set the full name of the key.

\func{}{wxRegKey}{\param{const wxRegKey\&}{ keyParent}, \param{const wxString\&}{ strKey}}

The constructor to set the full name of the key under a previously created parent.

\membersection{wxRegKey::Close}\label{wxregkeyclose}

\func{void}{Close}{\void}

Closes the key.

\membersection{wxRegKey::Create}\label{wxregkeycreate}

\func{bool}{Create}{\param{bool }{bOkIfExists = true}}

Creates the key. Will fail if the key already exists and {\it bOkIfExists} is false.

\membersection{wxRegKey::DeleteSelf}\label{wxregkeydeleteself}

\func{void}{DeleteSelf}{\void}

Deletes this key and all of its subkeys and values recursively.

\membersection{wxRegKey::DeleteKey}\label{wxregkeydeletekey}

\func{void}{DeleteKey}{\param{const wxChar *}{szKey}}

Deletes the subkey with all of its subkeys/values recursively.

\membersection{wxRegKey::DeleteValue}\label{wxregkeydeletevalue}

\func{void}{DeleteValue}{\param{const wxChar *}{szKey}}

Deletes the named value.

\membersection{wxRegKey::Exists}\label{wxregkeyexists}

\constfunc{static bool}{Exists}{\void}

Returns true if the key exists.

\membersection{wxRegKey::GetName}\label{wxregkeygetname}

\constfunc{wxString}{GetName}{\param{bool }{bShortPrefix = true}}

Gets the name of the registry key.

\membersection{wxRegKey::GetFirstKey}\label{wxregkeygetfirstkey}

\func{bool}{GetKeyValue}{\param{wxString\&}{ strKeyName}, \param{long\&}{ lIndex}}

Gets the first key.

\membersection{wxRegKey::GetFirstValue}\label{wxregkeygetfirstvalue}

\func{bool}{GetFirstValue}{\param{wxString\&}{ strValueName}, \param{long\&}{ lIndex}}

Gets the first value of this key.

\membersection{wxRegKey::GetKeyInfo}\label{wxregkeygetkeyinfo}

\constfunc{bool}{Exists}{\param{size\_t *}{pnSubKeys}, \param{size\_t *}{pnValues}, \param{size\_t *}{pnMaxValueLen}}

Gets information about the key.

\wxheading{Parameters}

\docparam{pnSubKeys}{The number of subkeys.}

\docparam{pnMaxKeyLen}{The maximum length of the subkey name.}

\docparam{pnValues}{The number of values.}

\membersection{wxRegKey::GetNextKey}\label{wxregkeygetnextkey}

\constfunc{bool}{GetNextKey}{\param{wxString\&}{ strKeyName}, \param{long\&}{ lIndex}}

Gets the next key.

\membersection{wxRegKey::GetNextValue}\label{wxregkeygetnextvalue}

\constfunc{bool}{GetNextValue}{\param{wxString\&}{ strValueName}, \param{long\&}{ lIndex}}

Gets the next key value for this key.

\membersection{wxRegKey::HasValue}\label{wxregkeyhasvalue}

\constfunc{bool}{HasValue}{\param{const wxChar *}{szValue}}

Returns true if the value exists.

\membersection{wxRegKey::HasValues}\label{wxregkeyhasvalues}

\constfunc{bool}{HasValues}{\void}

Returns true if any values exist.

\membersection{wxRegKey::HasSubKey}\label{wxregkeyhassubkey}

\constfunc{bool}{HasSubKey}{\param{const wxChar *}{szKey}}

Returns true if given subkey exists.

\membersection{wxRegKey::HasSubKeys}\label{wxregkeyhassubkeys}

\constfunc{bool}{HasSubKeys}{\void}

Returns true if any subkeys exist.

\membersection{wxRegKey::IsEmpty}\label{wxregkeyisempty}

\constfunc{bool}{IsEmpty}{\void}

Returns true if this key is empty, nothing under this key.

\membersection{wxRegKey::IsOpened}\label{wxregkeyisopened}

\constfunc{bool}{IsOpened}{\void}

Returns true if the key is opened.

\membersection{wxRegKey::Open}\label{wxregkeyopen}

\func{bool}{Open}{\void}

Explicitly opens the key to be opened.

\membersection{wxRegKey::QueryValue}\label{wxregkeyqueryvalue}

\constfunc{bool}{QueryValue}{\param{const wxChar *}{szValue}, \param{wxString\&}{ strValue}}

Retrieves the string value.

\constfunc{bool}{QueryValue}{\param{const wxChar *}{szValue}, \param{long *}{plValue}}

Retrieves the numeric value.

\membersection{wxRegKey::Rename}\label{wxregkeyrename}

\func{bool}{Rename}{\param{const wxChar *}{ szNewName}}

Renames the key.

\membersection{wxRegKey::RenameValue}\label{wxregkeyrenamevalue}

\func{bool}{RenameValue}{\param{const wxChar *}{szValueOld}, \param{const wxChar *}{szValueNew}}

Renames a value.

\membersection{wxRegKey::SetValue}\label{wxregkeysetvalue}

\func{bool}{SetValue}{\param{const wxChar *}{szValue}, \param{long}{ lValue}}

Sets the numeric value.