include/wx/msw/registry.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/msw/registry.h
   3 // Purpose:     Registry classes and functions
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     03.04.1998
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_MSW_REGISTRY_H_
  13 #define _WX_MSW_REGISTRY_H_
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_REGKEY
  18
  19 class WXDLLIMPEXP_FWD_BASE wxOutputStream;
  20
  21 // ----------------------------------------------------------------------------
  22 // class wxRegKey encapsulates window HKEY handle
  23 // ----------------------------------------------------------------------------
  24
  25 class WXDLLIMPEXP_BASE wxRegKey
  26 {
  27 public:
  28   // NB: do _not_ change the values of elements in these enumerations!
  29
  30   // registry value types (with comments from winnt.h)
  31   enum ValueType
  32   {
  33     Type_None,                       // No value type
  34     Type_String,                     // Unicode nul terminated string
  35     Type_Expand_String,              // Unicode nul terminated string
  36                                      // (with environment variable references)
  37     Type_Binary,                     // Free form binary
  38     Type_Dword,                      // 32-bit number
  39     Type_Dword_little_endian         // 32-bit number
  40         = Type_Dword,                // (same as Type_DWORD)
  41     Type_Dword_big_endian,           // 32-bit number
  42     Type_Link,                       // Symbolic Link (unicode)
  43     Type_Multi_String,               // Multiple Unicode strings
  44     Type_Resource_list,              // Resource list in the resource map
  45     Type_Full_resource_descriptor,   // Resource list in the hardware description
  46     Type_Resource_requirements_list  // ???
  47   };
  48
  49   // predefined registry keys
  50   enum StdKey
  51   {
  52     HKCR,       // classes root
  53     HKCU,       // current user
  54     HKLM,       // local machine
  55     HKUSR,      // users
  56     HKPD,       // performance data (WinNT/2K only)
  57     HKCC,       // current config
  58     HKDD,       // dynamic data (Win95/98 only)
  59     HKMAX
  60   };
  61
  62   // access mode for the key
  63   enum AccessMode
  64   {
  65       Read,     // read-only
  66       Write     // read and write
  67   };
  68
  69   // information about standard (predefined) registry keys
  70     // number of standard keys
  71   static const size_t nStdKeys;
  72     // get the name of a standard key
  73   static const wxChar *GetStdKeyName(size_t key);
  74     // get the short name of a standard key
  75   static const wxChar *GetStdKeyShortName(size_t key);
  76     // get StdKey from root HKEY
  77   static StdKey GetStdKeyFromHkey(WXHKEY hkey);
  78
  79   // extacts the std key prefix from the string (return value) and
  80   // leaves only the part after it (i.e. modifies the string passed!)
  81   static StdKey ExtractKeyName(wxString& str);
  82
  83   // ctors
  84     // root key is set to HKCR (the only root key under Win16)
  85   wxRegKey();
  86     // strKey is the full name of the key (i.e. starting with HKEY_xxx...)
  87   wxRegKey(const wxString& strKey);
  88     // strKey is the name of key under (standard key) keyParent
  89   wxRegKey(StdKey keyParent, const wxString& strKey);
  90     // strKey is the name of key under (previously created) keyParent
  91   wxRegKey(const wxRegKey& keyParent, const wxString& strKey);
  92     // dtor closes the key
  93  ~wxRegKey();
  94
  95   // change key (closes the previously opened key if any)
  96     // the name is absolute, i.e. should start with HKEY_xxx
  97   void  SetName(const wxString& strKey);
  98     // the name is relative to the parent key
  99   void  SetName(StdKey keyParent, const wxString& strKey);
 100     // the name is relative to the parent key
 101   void  SetName(const wxRegKey& keyParent, const wxString& strKey);
 102     // hKey should be opened and will be closed in wxRegKey dtor
 103   void  SetHkey(WXHKEY hKey);
 104
 105   // get infomation about the key
 106     // get the (full) key name. Abbreviate std root keys if bShortPrefix.
 107   wxString GetName(bool bShortPrefix = true) const;
 108     // return true if the key exists
 109   bool  Exists() const;
 110     // get the info about key (any number of these pointers may be NULL)
 111   bool  GetKeyInfo(size_t *pnSubKeys,      // number of subkeys
 112                    size_t *pnMaxKeyLen,    // max len of subkey name
 113                    size_t *pnValues,       // number of values
 114                    size_t *pnMaxValueLen) const;
 115     // return true if the key is opened
 116   bool  IsOpened() const { return m_hKey != 0; }
 117     // for "if ( !key ) wxLogError(...)" kind of expressions
 118   operator bool()  const { return m_dwLastError == 0; }
 119
 120   // operations on the key itself
 121     // explicitly open the key (will be automatically done by all functions
 122     // which need the key to be opened if the key is not opened yet)
 123   bool  Open(AccessMode mode = Write);
 124     // create the key: will fail if the key already exists and !bOkIfExists
 125   bool  Create(bool bOkIfExists = true);
 126     // rename a value from old name to new one
 127   bool  RenameValue(const wxString& szValueOld, const wxString& szValueNew);
 128     // rename the key
 129   bool  Rename(const wxString& szNewName);
 130     // copy value to another key possibly changing its name (by default it will
 131     // remain the same)
 132   bool  CopyValue(const wxString& szValue, wxRegKey& keyDst,
 133                   const wxString& szNewName = wxEmptyString);
 134
 135     // copy the entire contents of the key recursively to another location
 136   bool  Copy(const wxString& szNewName);
 137     // same as Copy() but using a key and not the name
 138   bool  Copy(wxRegKey& keyDst);
 139     // close the key (will be automatically done in dtor)
 140   bool  Close();
 141
 142   // deleting keys/values
 143     // deletes this key and all of it's subkeys/values
 144   bool  DeleteSelf();
 145     // deletes the subkey with all of it's subkeys/values recursively
 146   bool  DeleteKey(const wxString& szKey);
 147     // deletes the named value (may be empty string to remove the default value)
 148   bool DeleteValue(const wxString& szValue);
 149
 150   // access to values and subkeys
 151     // get value type
 152   ValueType GetValueType(const wxString& szValue) const;
 153     // returns true if the value contains a number (else it's some string)
 154   bool IsNumericValue(const wxString& szValue) const;
 155
 156     // assignment operators set the default value of the key
 157   wxRegKey& operator=(const wxString& strValue)
 158     { SetValue(wxEmptyString, strValue); return *this; }
 159
 160     // query the default value of the key: implicitly or explicitly
 161   wxString QueryDefaultValue() const;
 162   operator wxString() const { return QueryDefaultValue(); }
 163
 164     // named values
 165
 166     // set the string value
 167   bool  SetValue(const wxString& szValue, const wxString& strValue);
 168     // retrieve the string value
 169   bool  QueryValue(const wxString& szValue, wxString& strValue) const
 170     { return QueryValue(szValue, strValue, false); }
 171     // retrieve raw string value
 172   bool  QueryRawValue(const wxString& szValue, wxString& strValue) const
 173     { return QueryValue(szValue, strValue, true); }
 174     // retrieve either raw or expanded string value
 175   bool  QueryValue(const wxString& szValue, wxString& strValue, bool raw) const;
 176
 177     // set the numeric value
 178   bool  SetValue(const wxString& szValue, long lValue);
 179     // return the numeric value
 180   bool  QueryValue(const wxString& szValue, long *plValue) const;
 181     // set the binary value
 182   bool  SetValue(const wxString& szValue, const wxMemoryBuffer& buf);
 183     // return the binary value
 184   bool  QueryValue(const wxString& szValue, wxMemoryBuffer& buf) const;
 185
 186   // query existence of a key/value
 187     // return true if value exists
 188   bool HasValue(const wxString& szKey) const;
 189     // return true if given subkey exists
 190   bool HasSubKey(const wxString& szKey) const;
 191     // return true if any subkeys exist
 192   bool HasSubkeys() const;
 193     // return true if any values exist
 194   bool HasValues() const;
 195     // return true if the key is empty (nothing under this key)
 196   bool IsEmpty() const { return !HasSubkeys() && !HasValues(); }
 197
 198   // enumerate values and subkeys
 199   bool  GetFirstValue(wxString& strValueName, long& lIndex);
 200   bool  GetNextValue (wxString& strValueName, long& lIndex) const;
 201
 202   bool  GetFirstKey  (wxString& strKeyName  , long& lIndex);
 203   bool  GetNextKey   (wxString& strKeyName  , long& lIndex) const;
 204
 205   // export the contents of this key and all its subkeys to the given file
 206   // (which won't be overwritten, it's an error if it already exists)
 207   //
 208   // note that we export the key in REGEDIT4 format, not RegSaveKey() binary
 209   // format nor newer REGEDIT5 one
 210   bool Export(const wxString& filename) const;
 211
 212   // same as above but write to the given (opened) stream
 213   bool Export(wxOutputStream& ostr) const;
 214
 215
 216   // for wxRegConfig usage only: preallocate some memory for the name
 217   void ReserveMemoryForName(size_t bytes) { m_strKey.reserve(bytes); }
 218
 219 private:
 220   // common part of all ctors
 221   void Init()
 222   {
 223     m_hKey = (WXHKEY) NULL;
 224     m_dwLastError = 0;
 225   }
 226
 227   // recursive helper for Export()
 228   bool DoExport(wxOutputStream& ostr) const;
 229
 230   // export a single value
 231   bool DoExportValue(wxOutputStream& ostr, const wxString& name) const;
 232
 233   // return the text representation (in REGEDIT4 format) of the value with the
 234   // given name
 235   wxString FormatValue(const wxString& name) const;
 236
 237
 238   WXHKEY      m_hKey,           // our handle
 239               m_hRootKey;       // handle of the top key (i.e. StdKey)
 240   wxString    m_strKey;         // key name (relative to m_hRootKey)
 241
 242   AccessMode  m_mode;           // valid only if key is opened
 243   long        m_dwLastError;    // last error (0 if none)
 244
 245
 246   wxDECLARE_NO_COPY_CLASS(wxRegKey);
 247 };
 248
 249 #endif // wxUSE_REGKEY
 250
 251 #endif // _WX_MSW_REGISTRY_H_
 252