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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  16 #pragma interface "registry.h"
  17 #endif
  18
  19 class WXDLLIMPEXP_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 #ifndef __WXWINCE__
  57     ,
  58     HKPD        // performance data (WinNT/2K only)
  59 #endif
  60 #if WINVER >= 0x0400
  61     ,
  62     HKCC,       // current config (starting from Win95/NT 4.0)
  63     HKDD        // dynamic data (Win95/98 only)
  64 #endif  // Winver
  65   };
  66
  67   // access mode for the key
  68   enum AccessMode
  69   {
  70       Read,     // read-only
  71       Write     // read and write
  72   };
  73
  74   // information about standard (predefined) registry keys
  75     // number of standard keys
  76   static const size_t nStdKeys;
  77     // get the name of a standard key
  78   static const wxChar *GetStdKeyName(size_t key);
  79     // get the short name of a standard key
  80   static const wxChar *GetStdKeyShortName(size_t key);
  81     // get StdKey from root HKEY
  82   static StdKey GetStdKeyFromHkey(WXHKEY hkey);
  83
  84   // extacts the std key prefix from the string (return value) and
  85   // leaves only the part after it (i.e. modifies the string passed!)
  86   static StdKey ExtractKeyName(wxString& str);
  87
  88   // ctors
  89     // root key is set to HKCR (the only root key under Win16)
  90   wxRegKey();
  91     // strKey is the full name of the key (i.e. starting with HKEY_xxx...)
  92   wxRegKey(const wxString& strKey);
  93     // strKey is the name of key under (standard key) keyParent
  94   wxRegKey(StdKey keyParent, const wxString& strKey);
  95     // strKey is the name of key under (previously created) keyParent
  96   wxRegKey(const wxRegKey& keyParent, const wxString& strKey);
  97     // dtor closes the key
  98  ~wxRegKey();
  99
 100   // change key (closes the previously opened key if any)
 101     // the name is absolute, i.e. should start with HKEY_xxx
 102   void  SetName(const wxString& strKey);
 103     // the name is relative to the parent key
 104   void  SetName(StdKey keyParent, const wxString& strKey);
 105     // the name is relative to the parent key
 106   void  SetName(const wxRegKey& keyParent, const wxString& strKey);
 107     // hKey should be opened and will be closed in wxRegKey dtor
 108   void  SetHkey(WXHKEY hKey);
 109
 110   // get infomation about the key
 111     // get the (full) key name. Abbreviate std root keys if bShortPrefix.
 112   wxString GetName(bool bShortPrefix = true) const;
 113     // return true if the key exists
 114   bool  Exists() const;
 115     // get the info about key (any number of these pointers may be NULL)
 116   bool  GetKeyInfo(size_t *pnSubKeys,      // number of subkeys
 117                    size_t *pnMaxKeyLen,    // max len of subkey name
 118                    size_t *pnValues,       // number of values
 119                    size_t *pnMaxValueLen) const;
 120     // return true if the key is opened
 121   bool  IsOpened() const { return m_hKey != 0; }
 122     // for "if ( !key ) wxLogError(...)" kind of expressions
 123   operator bool()  const { return m_dwLastError == 0; }
 124
 125   // operations on the key itself
 126     // explicitly open the key (will be automatically done by all functions
 127     // which need the key to be opened if the key is not opened yet)
 128   bool  Open(AccessMode mode = Write);
 129     // create the key: will fail if the key already exists and !bOkIfExists
 130   bool  Create(bool bOkIfExists = true);
 131     // rename a value from old name to new one
 132   bool  RenameValue(const wxChar *szValueOld, const wxChar *szValueNew);
 133     // rename the key
 134   bool  Rename(const wxChar *szNewName);
 135     // copy value to another key possibly changing its name (by default it will
 136     // remain the same)
 137   bool  CopyValue(const wxChar *szValue, wxRegKey& keyDst,
 138                   const wxChar *szNewName = NULL);
 139     // copy the entire contents of the key recursively to another location
 140   bool  Copy(const wxChar *szNewName);
 141     // same as Copy() but using a key and not the name
 142   bool  Copy(wxRegKey& keyDst);
 143     // close the key (will be automatically done in dtor)
 144   bool  Close();
 145
 146   // deleting keys/values
 147     // deletes this key and all of it's subkeys/values
 148   bool  DeleteSelf();
 149     // deletes the subkey with all of it's subkeys/values recursively
 150   bool  DeleteKey(const wxChar *szKey);
 151     // deletes the named value (may be NULL to remove the default value)
 152   bool  DeleteValue(const wxChar *szValue);
 153
 154   // access to values and subkeys
 155     // get value type
 156   ValueType GetValueType(const wxChar *szValue) const;
 157     // returns true if the value contains a number (else it's some string)
 158   bool IsNumericValue(const wxChar *szValue) const;
 159
 160     // assignment operators set the default value of the key
 161   wxRegKey& operator=(const wxString& strValue)
 162     { SetValue(NULL, strValue); return *this; }
 163   wxRegKey& operator=(long lValue)
 164     { SetValue(NULL, lValue); return *this; }
 165
 166     // query the default value of the key: implicitly or explicitly
 167   wxString QueryDefaultValue() const;
 168   operator wxString() const { return QueryDefaultValue(); }
 169
 170     // named values
 171
 172     // set the string value
 173   bool  SetValue(const wxChar *szValue, const wxString& strValue);
 174     // retrieve the string value
 175   bool  QueryValue(const wxChar *szValue, wxString& strValue) const
 176     { return QueryValue(szValue, strValue, false); }
 177     // retrieve raw string value
 178   bool  QueryRawValue(const wxChar *szValue, wxString& strValue) const
 179     { return QueryValue(szValue, strValue, true); }
 180     // retrieve either raw or expanded string value
 181   bool  QueryValue(const wxChar *szValue, wxString& strValue, bool raw) const;
 182
 183     // set the numeric value
 184   bool  SetValue(const wxChar *szValue, long lValue);
 185     // return the numeric value
 186   bool  QueryValue(const wxChar *szValue, long *plValue) const;
 187     // set the binary value
 188   bool  SetValue(const wxChar *szValue, const wxMemoryBuffer& buf);
 189     // return the binary value
 190   bool  QueryValue(const wxChar *szValue, wxMemoryBuffer& buf) const;
 191
 192   // query existence of a key/value
 193     // return true if value exists
 194   bool HasValue(const wxChar *szKey) const;
 195     // return true if given subkey exists
 196   bool HasSubKey(const wxChar *szKey) const;
 197     // return true if any subkeys exist
 198   bool HasSubkeys() const;
 199     // return true if any values exist
 200   bool HasValues() const;
 201     // return true if the key is empty (nothing under this key)
 202   bool IsEmpty() const { return !HasSubkeys() && !HasValues(); }
 203
 204   // enumerate values and subkeys
 205   bool  GetFirstValue(wxString& strValueName, long& lIndex);
 206   bool  GetNextValue (wxString& strValueName, long& lIndex) const;
 207
 208   bool  GetFirstKey  (wxString& strKeyName  , long& lIndex);
 209   bool  GetNextKey   (wxString& strKeyName  , long& lIndex) const;
 210
 211   // export the contents of this key and all its subkeys to the given file
 212   // (which won't be overwritten, it's an error if it already exists)
 213   //
 214   // note that we export the key in REGEDIT4 format, not RegSaveKey() binary
 215   // format nor newer REGEDIT5 one
 216   bool Export(const wxString& filename) const;
 217
 218   // same as above but write to the given (opened) stream
 219   bool Export(wxOutputStream& ostr) const;
 220
 221
 222   // for wxRegConfig usage only: preallocate some memory for the name
 223   void ReserveMemoryForName(size_t bytes) { m_strKey.reserve(bytes); }
 224
 225 private:
 226   // common part of all ctors
 227   void Init()
 228   {
 229     m_hKey = (WXHKEY) NULL;
 230     m_dwLastError = 0;
 231   }
 232
 233   // recursive helper for Export()
 234   bool DoExport(wxOutputStream& ostr) const;
 235
 236   // export a single value
 237   bool DoExportValue(wxOutputStream& ostr, const wxString& name) const;
 238
 239   // return the text representation (in REGEDIT4 format) of the value with the
 240   // given name
 241   wxString FormatValue(const wxString& name) const;
 242
 243
 244   WXHKEY      m_hKey,           // our handle
 245               m_hRootKey;       // handle of the top key (i.e. StdKey)
 246   wxString    m_strKey;         // key name (relative to m_hRootKey)
 247
 248   long        m_dwLastError;    // last error (0 if none)
 249
 250
 251   DECLARE_NO_COPY_CLASS(wxRegKey)
 252 };
 253
 254 #endif // _WX_MSW_REGISTRY_H_
 255