wxWidgets/include/wx/msw/registry.h

///////////////////////////////////////////////////////////////////////////////
// Name:        msw/registry.h
// Purpose:     Registry classes and functions
// Author:      Vadim Zeitlin
// Modified by: 
// Created:     03.04.198
// RCS-ID:      $Id$
// Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence:     wxWindows license
///////////////////////////////////////////////////////////////////////////////

#ifndef   _REGISTRY_H
#define   _REGISTRY_H

// ----------------------------------------------------------------------------
// mutable hack (see also registry.cpp)
// ----------------------------------------------------------------------------
#if   USE_MUTABLE
  #define MUTABLE mutable
#else
  #define MUTABLE
#endif

// ----------------------------------------------------------------------------
// forward decl for handle type
// ----------------------------------------------------------------------------
#ifndef   HKEY_DEFINED
  #define HKEY_DEFINED
  #define HKEY unsigned long
#endif

// ----------------------------------------------------------------------------
// class wxRegKey encapsulates window HKEY handle
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxRegKey 
{
public:
  // NB: do _not_ change the values of elements in these enumerations!

  // registry value types (with comments from winnt.h)
  enum ValueType
  {
    Type_None,                       // No value type
    Type_String,                     // Unicode nul terminated string
#ifdef  __WIN32__
    Type_Expand_String,              // Unicode nul terminated string
                                     // (with environment variable references)
    Type_Binary,                     // Free form binary
    Type_Dword,                      // 32-bit number
    Type_Dword_little_endian,        // 32-bit number (same as Type_DWORD)
    Type_Dword_big_endian,           // 32-bit number
    Type_Link,                       // Symbolic Link (unicode)
    Type_Multi_String,               // Multiple Unicode strings
    Type_Resource_list,              // Resource list in the resource map
    Type_Full_resource_descriptor,   // Resource list in the hardware description
    Type_Resource_requirements_list, // ???
#endif  //WIN32
  };

  // predefined registry keys
  enum StdKey
  {
    HKCR,     // classes root
#ifdef  __WIN32__
    HKCU,     // current user
    HKLM,     // local machine
    HKUSR,    // users
    HKPD,     // performance data (@@ NT only?)
#if    WINVER >= 0x0400
    HKCC,     // current config
    HKDD,     // dynamic data
#endif  // Winver
#endif  // Win32/16
  };

  // information about standard (predefined) registry keys
    // number of standard keys
  static const size_t nStdKeys;
    // get the name of a standard key
  static const char *GetStdKeyName(uint key);
    // get the short name of a standard key
  static const char *GetStdKeyShortName(uint key);
    // get StdKey from root HKEY
  static StdKey GetStdKeyFromHkey(HKEY hkey);

  // extacts the std key prefix from the string (return value) and
  // leaves only the part after it (i.e. modifies the string passed!)
  static StdKey ExtractKeyName(wxString& str);

  // ctors
    // root key is set to HKCR (the only root key under Win16)
  wxRegKey();
    // strKey is the full name of the key (i.e. starting with HKEY_xxx...)
  wxRegKey(const wxString& strKey);
    // strKey is the name of key under (standard key) keyParent
  wxRegKey(StdKey          keyParent, const wxString& strKey);
    // strKey is the name of key under (previously created) keyParent
  wxRegKey(const wxRegKey& keyParent, const wxString& strKey);
    //
 ~wxRegKey();

  // change key (closes the previously opened key if any)
  void  SetName(const wxString& strKey);
  void  SetHkey(HKEY  hKey);

  // get infomation about the key
    // get the (full) key name. Abbreviate std root keys if bShortPrefix.
  wxString GetName(bool bShortPrefix = TRUE) const;
    // return TRUE if the key exists
  bool  Exists()   const;
    // return TRUE if the key is opened
  bool  IsOpened() const { return m_hKey != 0;        }
    // for "if ( !key ) wxLogError(...)" kind of expressions
  operator bool()  const { return m_dwLastError == 0; }

  // operations on the key itself
    // explicitly open the key (will be automatically done by all functions
    // which need the key to be opened if the key is not opened yet)
  bool  Open();
    // create the key: will fail if the key already exists and bOkIfExists
  bool  Create(bool bOkIfExists = TRUE);
    // close the key (will be automatically done in dtor)
  bool  Close();

  // deleting keys/values
    // deletes this key and all of it's subkeys/values
  bool  DeleteSelf();
    // deletes the subkey with all of it's subkeys/values recursively
  bool  DeleteKey(const char *szKey);
    // deletes the named value (may be NULL to remove the default value)
  bool  DeleteValue(const char *szValue);

  // access to values and subkeys
    // get value type
  ValueType GetValueType(const char *szValue);

    // assignment operators set the default value of the key
  wxRegKey& operator=(const wxString& strValue)
    { SetValue(NULL, strValue); return *this; }
  wxRegKey& operator=(long lValue)
    { SetValue(NULL, lValue); return *this; }

    // conversion operators query the default value of the key
  operator wxString() const;

    // set the string value
  bool  SetValue(const char *szValue, const wxString& strValue);
    // return the string value
  bool  QueryValue(const char *szValue, wxString& strValue) const;

#ifdef  __WIN32__
    // set the numeric value
  bool  SetValue(const char *szValue, long lValue);
    // return the numeric value
  bool  QueryValue(const char *szValue, long *plValue) const;
#endif  //Win32

    // return TRUE if given subkey exists
  bool  HasSubKey(const char *szKey) const;
    // return TRUE if any subkeys exist
  bool  HasSubkeys() const;

  // enumerate values and subkeys
#ifdef  __WIN32__
  bool  GetFirstValue(wxString& strValueName, long& lIndex);
  bool  GetNextValue (wxString& strValueName, long& lIndex) const;
#endif  //Win32

  bool  GetFirstKey  (wxString& strKeyName  , long& lIndex);
  bool  GetNextKey   (wxString& strKeyName  , long& lIndex) const;

private:
  // no copy ctor/assignment operator
  wxRegKey(const wxRegKey& key);            // not implemented
  wxRegKey& operator=(const wxRegKey& key); // not implemented

  HKEY        m_hKey,           // our handle
              m_hRootKey;       // handle of the top key (i.e. StdKey)
  wxString    m_strKey;         // key name (relative to m_hRootKey)

  MUTABLE long m_dwLastError;   // last error (0 if none)
};

#endif  //_REGISTRY_H