在前一篇中，我有提到应用程序关联的方法，归根结底就是在注册表中添加了相应的内容。但这样有个不好的地方，就是会在注册表中留下很多垃圾信息。怎样在调试完程序后，自动清除注册表中冗余的信息呢？我在这里提供一个简单的方法，与大家分享哈。
》》》VC文件关联小结
(一)跟大家介绍一个c++的注册表操作的封装类
1.注册表项RegEntry.h
// CRegEntry: interface for the CRegEntry class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(_REGENTRY_H_INCLUDED)
#define _REGENTRY_H_INCLUDED
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
class CRegistry;
class CRegEntry
{
public:
CRegEntry(CRegistry* Owner = NULL);
virtual ~CRegEntry() { if (lpszName) delete [] lpszName; if (lpszStr) delete [] lpszStr; };
/* -----------------------------------------*
* Operators *
* -----------------------------------------*/
CRegEntry& operator =( CRegEntry& cregValue );
CRegEntry& operator =( LPCTSTR lpszValue );
CRegEntry& operator =( LPDWORD lpdwValue );
CRegEntry& operator =( DWORD dwValue ) { return (*this = &dwValue); }
operator LPTSTR();
operator DWORD();
// Data types without implemented conversions
// NOTE: I realize these will only check asserts
// when a value is set and retrieved during the
// same session. But it is better than no check.
REGENTRY_NONCONV_STORAGETYPE(POINT);
REGENTRY_NONCONV_STORAGETYPE(RECT);
// Numeric types with conversions
// If you'd like to add more, follow this form:
// data type, max string length + 1, format specification, from string, from DWORD
REGENTRY_CONV_NUMERIC_STORAGETYPE(__int64, 28, %I64d, _ttoi64(lpszStr), (__int64)dwDWORD)
REGENTRY_CONV_NUMERIC_STORAGETYPE(double, 18, %f, _tcstod(lpszStr, NULL), (double)dwDWORD)
REGENTRY_CONV_NUMERIC_STORAGETYPE(bool, 2, %d, (_ttoi(lpszStr) != 0), (dwDWORD != 0))
REGENTRY_CONV_NUMERIC_STORAGETYPE(int, 12, %d, _ttoi(lpszStr), (int)dwDWORD)
REGENTRY_CONV_NUMERIC_STORAGETYPE(UINT, 11, %d, (UINT)_tcstoul(lpszStr, NULL, NULL), (UINT)dwDWORD)
// Types with conversions: type to/from string, type from unsigned long
REGENTRY_CONV_STORAGETYPE(tstring, _R_BUF(_MAX_REG_VALUE); _tcscpy(buffer, Value.c_str());,
lpszStr, _ultot(dwDWORD, lpszStr, NULL), _T(""))
/* -----------------------------------------*
* Member Variables and Functions *
* -----------------------------------------*/
LPTSTR lpszName; // The value name
UINT iType; // Value data type
void InitData(CRegistry* Owner = NULL);
void ForceStr();
bool Delete();
/* The following six functions handle REG_MULTI_SZ support: */
void SetMulti(LPCTSTR lpszValue, size_t nLen, bool bInternal = false);
void MultiRemoveAt(size_t nIndex);
void MultiSetAt(size_t nIndex, LPCTSTR lpszVal);
LPTSTR GetMulti(LPTSTR lpszDest, size_t nMax = _MAX_REG_VALUE);
LPCTSTR MultiGetAt(size_t nIndex);
size_t MultiLength(bool bInternal = false);
size_t MultiCount();
void SetBinary(LPBYTE lpbValue, size_t nLen);
void GetBinary(LPBYTE lpbDest, size_t nMaxLen);
size_t GetBinaryLength();
bool Convertible() { return __bConvertable; }
__inline SetOwner(CRegistry* Owner) { __cregOwner = Owner; }
template <class T>void SetStruct(T &type) { SetBinary((LPBYTE) &type, sizeof(T)); }
template <class T>void GetStruct(T &type) { GetBinary((LPBYTE) &type, sizeof(T)); }
__inline IsString() { return (iType == REG_SZ); }
__inline IsDWORD() { return (iType == REG_DWORD); }
__inline IsBinary() { return (iType == REG_BINARY); }
__inline IsMultiString() { return (iType == REG_MULTI_SZ); }
__inline IsStored() { return __bStored; }
__inline Exists() { return __bStored; }
__inline MultiClear() { SetMulti(_T("/0"), 2); }
__inline MultiAdd(LPCTSTR lpszVal) { MultiSetAt(MultiCount(), lpszVal); }
protected:
CRegistry* __cregOwner;
bool __bConvertable;
bool __bStored;
private:
/* Create a variable for each prominent data type */
DWORD dwDWORD;
LPTSTR lpszStr;
std::vector<BYTE> vBytes;
std::vector<tstring> vMultiString;
};
#endif
2.注册表节点Registry.h
#if !defined(_REGISTRY_H_INCLUDED)
#define _REGISTRY_H_INCLUDED
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
/* Silence STL warnings */
#pragma warning (disable : 4786)
#pragma warning (disable : 4514)
#pragma warning (push, 3)
#ifdef _UNICODE
#if !defined(UNICODE)
#define UNICODE
#endif
#endif
#include <windows.h>
#include <math.h>
#include <TCHAR.h>
#include <stdlib.h>
#include <stdio.h>
#include <vector>
#include <assert.h>
/* ====================================
* Begin Preprocessor Definitions
*
* - Ugly, but well worth it.
* ==================================== */
#ifdef _UNICODE
typedef std::wstring tstring;
#else
typedef std::string tstring;
#endif
/* CRegistry Open Flags */
#define CREG_CREATE 1
#define CREG_AUTOOPEN 2
#define CREG_NOCACHE 4
/* CRegistry Behaivor flags */
#define CREG_LOADING 8
#define _MAX_REG_VALUE 2048 // Maximum Value length, this may be increased
#define NOT_ES(func) func != ERROR_SUCCESS
#define IS_ES(func) func == ERROR_SUCCESS
#define _R_BUF(size) _TCHAR buffer[size]
#define REGENTRY_AUTO __cregOwner->GetFlags() & CREG_AUTOOPEN
#define REGENTRY_TRYCLOSE if (REGENTRY_AUTO) __cregOwner->AutoClose()
#define REGENTRY_SZ_SAFE iType == REG_SZ || iType == REG_BINARY
#define REGENTRY_ALLOWCONV(b) __bConvertable = b;
#define REGENTRY_REFRESH_IF_NOCACHE /
if (__cregOwner->GetFlags() & CREG_NOCACHE && /
REGENTRY_NOTLOADING && REGENTRY_KEYVALID( KEY_QUERY_VALUE ))/
__cregOwner->Refresh();
#define REGENTRY_UPDATE_MULTISTRING /
LPTSTR lpszBuffer = new _TCHAR[_MAX_REG_VALUE]; /
REGENTRY_SETLOADING(+); GetMulti(lpszBuffer); REGENTRY_SETLOADING(-); /
SetMulti(lpszBuffer, MultiLength(true), true); /
delete [] lpszBuffer;
#define REGENTRY_KEYVALID(auto_access) /
lpszName && ((REGENTRY_AUTO && __cregOwner->AutoOpen(auto_access)) || (!(REGENTRY_AUTO) && __cregOwner->hKey != NULL))
#define REGENTRY_NOTLOADING /
!(__cregOwner->GetFlags() & CREG_LOADING)
#define REGENTRY_SETLOADING(op) /
__cregOwner->__dwFlags op= CREG_LOADING
#define REGENTRY_BINARYTOSTRING /
if (iType == REG_BINARY) { ForceStr(); lpszStr = *this; }
#define REGENTRY_NONCONV_STORAGETYPE(type) /
CRegEntry& operator=( type &Value ){ REGENTRY_ALLOWCONV(false) SetStruct(Value); return *this; } /
operator type(){ type Return; GetStruct(Return); return Return; }
#define REGENTRY_CONV_STORAGETYPE(type, to_sz, from_sz, from_dw, no_result) /
CRegEntry& operator=( type Value ) { to_sz return (*this = (LPCTSTR)(buffer)); } /
operator type(){ REGENTRY_BINARYTOSTRING return (REGENTRY_SZ_SAFE ? from_sz :(iType == REG_DWORD ? from_dw : no_result)); }
#define REGENTRY_CONV_NUMERIC_STORAGETYPE(type, maxlen, form, from_sz, from_dw) /
REGENTRY_CONV_STORAGETYPE(type, _R_BUF(maxlen); _stprintf(buffer, _T(#form), Value);, from_sz, from_dw, 0)
/* ====================================
* Include CRegEntry Class Definition
* ==================================== */
#include "RegEntry.h"
/* ====================================
* Begin CRegistry Class Definition
* ==================================== */
using namespace std;
class CRegistry {
public:
CRegistry (DWORD flags = CREG_CREATE);
virtual ~CRegistry() { Close(); for (int i=0; i < _reEntries.size(); ++i) delete _reEntries[i]; delete [] _lpszSubKey; }
CRegEntry& operator[](LPCTSTR lpszVName);
CRegEntry* GetAt(size_t n) { assert(n < Count()); return _reEntries.at(n); }
bool Open(LPCTSTR lpszRegPath, HKEY hRootKey = HKEY_LOCAL_MACHINE,
DWORD dwAccess = KEY_QUERY_VALUE | KEY_SET_VALUE, bool bAuto = false);
bool AutoOpen(DWORD dwAccess);
void AutoClose();
void Close();
bool Refresh();
static bool KeyExists(LPCTSTR lpszRegPath, HKEY hRootKey = HKEY_LOCAL_MACHINE);
bool SubKeyExists(LPCTSTR lpszSub);
void DeleteKey();
__inline GetFlags() { return __dwFlags; }
__inline Count() { return _reEntries.size(); }
HKEY hKey; /* Registry key handle */
protected:
DWORD __dwFlags;
friend void CRegEntry::MultiSetAt(size_t nIndex, LPCTSTR lpszVal);
friend void CRegEntry::MultiRemoveAt(size_t nIndex);
private:
void InitData();
void DeleteKey(HKEY hPrimaryKey, LPCTSTR lpszSubKey);
HKEY _hRootKey;
LPTSTR _lpszSubKey;
std::vector<CRegEntry *> _reEntries;
};
#pragma warning(pop)
#endif
3.Registry.cpp
/*// --- FILE INFORMATION -----------------------------
CRegistry.cpp
Classes: CRegEntry and CRegistry
Author: Stuart Konen
Email: skonen@gmail.com
Date: 12/1/2004 (MM/DD/YYYY)
Version: 1.00
(-!-) If you're going to use these classes please do not
remove these comments... To use these classes, simply #include
Registry.h . In MFC you should also turn off precompiled headers
for this file, in VC++ this can be done by navigating to:
Project->Settings->Project Name->CRegistry.cpp->C/C++->Precompiled Headers
*///----------------------------------------------------
#include "stdafx.h"
#include "Registry.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#pragma warning (disable : 4706)
/* ===================================================
* CONSTRUCTOR
* =================================================*/
CRegEntry::CRegEntry(CRegistry *Owner) {
assert(Owner);
InitData(Owner);
}
/* ===================================================
* CRegEntry::InitData(CRegistry *Owner)
*
* Initializes the entries default values and sets the entries
* owner (CRegistry). This is only called during construction.
*/
void CRegEntry::InitData(CRegistry *Owner) {
dwDWORD = iType = 0;
lpszName = lpszStr = NULL;
__bStored = false;
__bConvertable = true;
__cregOwner = Owner;
}
/* ===================================================
* CRegEntry::ForceStr()
*
* Forces the memory allocation for the entry's string value, if it
* has not already been allocated.
*/
void CRegEntry::ForceStr() {
if (lpszStr == NULL) { lpszStr = new _TCHAR[_MAX_REG_VALUE]; lpszStr[0] = 0; }
}
/* ===================================================
* CRegEntry::operator=(LPCTSTR lpszValue)
*
* OPERATOR: Assigns a const character array to the open
* registry value. The registry value type will be REG_SZ.
*/
CRegEntry& CRegEntry::operator=(LPCTSTR lpszValue) {
size_t nValueLen = (_tcslen(lpszValue) + 1)*sizeof(TCHAR);
assert(nValueLen <= _MAX_REG_VALUE);
ForceStr(); iType = REG_SZ;
_tcsncpy(lpszStr, lpszValue, nValueLen > _MAX_REG_VALUE ? _MAX_REG_VALUE : nValueLen);
REGENTRY_ALLOWCONV(true)
if (REGENTRY_NOTLOADING && REGENTRY_KEYVALID( KEY_SET_VALUE ))
RegSetValueEx(__cregOwner->hKey, lpszName, NULL, REG_SZ, (LPBYTE)lpszValue, nValueLen);
REGENTRY_TRYCLOSE;
__bStored = true;
return *this;
}
/* ===================================================
* CRegEntry::operator=(LPDWORD lpdwValue)
*
* OPERATOR: Assigns a DWORD to the open registry value.
* The registry value type will be REG_DWORD.
*/
CRegEntry& CRegEntry::operator=(LPDWORD lpdwValue) {
iType = REG_DWORD;
memcpy(&dwDWORD, lpdwValue, sizeof( DWORD ));
REGENTRY_ALLOWCONV(true)
if (REGENTRY_NOTLOADING && REGENTRY_KEYVALID( KEY_SET_VALUE ))
RegSetValueEx(__cregOwner->hKey, lpszName, NULL, REG_DWORD, (LPBYTE)&dwDWORD, sizeof( DWORD ));
REGENTRY_TRYCLOSE;
__bStored = true;
return *this;
}
/* ===================================================
* CRegEntry::operator=(CRegEntry& cregValue)
*
* OPERATOR: Copys value information from the specified
* registry entry (CRegEntry) into this entry.
*/
CRegEntry& CRegEntry::operator=(CRegEntry& cregValue) {
if (this == &cregValue)
return *this;
if (lpszName == NULL) {
size_t nNameLen = _tcslen(cregValue.lpszName) + 1;
lpszName = new _TCHAR[nNameLen]; _tcsncpy(lpszName, cregValue.lpszName, nNameLen);
}
switch ((iType = cregValue.iType)) {
case REG_SZ:
return (*this = (ForceStr(), cregValue.lpszStr));
break;
case REG_MULTI_SZ: {
LPTSTR lpszBuf = new _TCHAR[_MAX_REG_VALUE];
SetMulti(cregValue.GetMulti(lpszBuf), cregValue.MultiLength());
delete [] lpszBuf; return *this;
}
break;
case REG_BINARY: {
size_t n = cregValue.vBytes.size(); LPBYTE buf = new BYTE[n];
cregValue.GetBinary(buf, n); SetBinary(buf, n);
delete [] buf; return *this;
}
break;
default:
return (*this = cregValue.dwDWORD);
}
}
/* ===================================================
* CRegEntry::operator LPTSTR()
*
* OPERATOR: Converts (if required) and returns the open registry
* value as a null terminated string.
*/
CRegEntry::operator LPTSTR() {
/* If caching is disabled, refresh the entries */
REGENTRY_REFRESH_IF_NOCACHE
assert(__bConvertable); // Check for conversion implementation
ForceStr();
switch (iType) {
case REG_DWORD:
_stprintf(lpszStr, _T("%lu"), dwDWORD);
break;
case REG_MULTI_SZ:
GetMulti(lpszStr);
break;
case REG_BINARY: {
_tcsncpy(lpszStr, (const _TCHAR*)&vBytes[0], vBytes.size());
lpszStr[vBytes.size()] = 0;
}
break;
}
return lpszStr;
}
/* ===================================================
* CRegEntry::operator DWORD()
*
* OPERATOR: Converts (if required) and returns the open registry
* value as an unsigned 32-bit integer (unsigned long).
*/
CRegEntry::operator DWORD() {
/* If caching is disabled, refresh the entries */
REGENTRY_REFRESH_IF_NOCACHE
assert(__bConvertable); // Check for conversion implementation
REGENTRY_BINARYTOSTRING
return (REGENTRY_SZ_SAFE ? _tcstoul(lpszStr, NULL, NULL) : dwDWORD);
}
/* ===================================================
* CRegEntry::GetBinary(LPBYTE lpbValue, size_t nLen)
*
* Sets the registry value to a binary value (REG_BINARY)
*
* Important Params:
*
* LPBYTE lpbDest: Pointer to the byte array to store *
* size_t nLen: Elements contained within the byte array.
*/
void CRegEntry::SetBinary(LPBYTE lpbValue, size_t nLen) {
if (!nLen) { assert(nLen); return; }
iType = REG_BINARY;
if (REGENTRY_NOTLOADING && REGENTRY_KEYVALID ( KEY_SET_VALUE ) )
RegSetValueEx(__cregOwner->hKey, lpszName, NULL, REG_BINARY, lpbValue, nLen);
REGENTRY_TRYCLOSE;
__bStored = true;
if (vBytes.size() < nLen) vBytes.reserve(nLen);
vBytes.clear();
do { vBytes.push_back(lpbValue[vBytes.size()]); }
while (vBytes.size() < nLen);
}
/* ===================================================
* CRegEntry::GetBinary(LPBYTE lpbDest, size_t nMaxLen)
*
* Gets the binary value of a value stored as REG_BINARY
*
* Important Params:
*
* LPBYTE lpbDest: Pointer to the byte array to fill
* size_t nMaxLen: The maximum bytes to copy to lpbDest
*
* Notes: This will only work for values that were saved
* using the binary registry type specification (REG_BINARY)
*/
void CRegEntry::GetBinary(LPBYTE lpbDest, size_t nMaxLen) {
assert(IsBinary()); // Must be stored as Binary
REGENTRY_REFRESH_IF_NOCACHE
if ((size_t)(&vBytes.back() - &vBytes.at(0)+1) == vBytes.size()*sizeof(BYTE))
memcpy(lpbDest, (LPBYTE)&vBytes.at(0), vBytes.size() > nMaxLen ? nMaxLen : vBytes.size());
else
for (size_t n=0; n < vBytes.size() && n < nMaxLen; n++)
lpbDest[n] = vBytes[n];
}
/* ===================================================
* CRegEntry::GetBinaryLength()
*
* Returns the size of the binary value in bytes.
*/
size_t CRegEntry::GetBinaryLength() {
assert(IsBinary());
REGENTRY_REFRESH_IF_NOCACHE
return vBytes.size();
}
/* ===================================================
* CRegEntry::SetMulti(LPCTSTR lpszValue, size_t nLen, bool bInternal)
*
* Stores an array of null-terminated string, terminated by two null characters.
* For Example: First String/0Second/Third/0/0
*
* Important Params:
*
* LPCTSTR lpszValue: The string consisting of the null-terminated string array
* size_t nLen: The number of characters in the string, including null characters
*
* Note: For inserting individual null-terminated strings into the array,
* use MultiAdd or MultiSetAt.
*/
void CRegEntry::SetMulti(LPCTSTR lpszValue, size_t nLen, bool bInternal) {
size_t nCur = 0, nPrev = 0, nShortLen = nLen;
/* When this is internal, there is no need to repopulate the vector. */
if (bInternal) goto SkipNoInternal;
iType = REG_MULTI_SZ; vMultiString.clear();
if (nLen <= 2) goto SkipNoInternal; // The string is empty : /0/0
if (*(lpszValue + nShortLen-1) == '/0')
nShortLen--;
/* Populate a vector with each string part for easy and quick access */
while ((nCur = (int)(_tcschr(lpszValue+nPrev, '/0')-lpszValue)) < nShortLen) {
vMultiString.push_back(lpszValue+nPrev);
nPrev = nCur+1;
}
SkipNoInternal:
if (REGENTRY_NOTLOADING && REGENTRY_KEYVALID ( KEY_SET_VALUE ) )
RegSetValueEx(__cregOwner->hKey, lpszName, NULL, REG_MULTI_SZ, (LPBYTE)lpszValue, nLen*sizeof(TCHAR));
REGENTRY_TRYCLOSE;
__bStored = true;
}
/* ===================================================
* CRegEntry::MultiLength(bool bInternal = false)
*
* Returns the number of characters (including null) stored
* in the full string. Don't confuse this with MultiCount()
* which returns the number of strings stored in the array.
*/
size_t CRegEntry::MultiLength(bool bInternal /*false*/) {
//Ensure correct values with no cache
if (!bInternal) REGENTRY_REFRESH_IF_NOCACHE
for (size_t nLen = 0, nIndex = 0; nIndex < vMultiString.size(); nIndex++)
nLen += vMultiString[nIndex].length() + 1;
return nLen ? nLen+1 : 0;
}
/* ===================================================
* CRegEntry::MultiCount()
*
* Returns the number of strings located within the array.
*/
size_t CRegEntry::MultiCount() {
// Ensure correct values with no cache
REGENTRY_REFRESH_IF_NOCACHE
return vMultiString.size();
}
/* ===================================================
* CRegEntry::MultiRemoveAt(size_t nIndex)
*
* Simply removes the string stored at the zero-based index of nIndex
*/
void CRegEntry::MultiRemoveAt(size_t nIndex) {
// Ensure correct values with no cache
REGENTRY_REFRESH_IF_NOCACHE
assert(nIndex < vMultiString.size());
vMultiString.erase(vMultiString.begin()+nIndex);
// Update the registry
REGENTRY_UPDATE_MULTISTRING
}
/* ===================================================
* CRegEntry::MultiSetAt(size_t nIndex, LPCTSTR lpszVal)
*
* Alters the value of a string in the array located at
* the 0 based index of nIndex. The new value is lpszVal.
* The index must be within the bounds of the array, with
* the exception of being == the number of elements in
* which case calling this function is equal to calling
* MultiAdd.
*/
void CRegEntry::MultiSetAt(size_t nIndex, LPCTSTR lpszVal) {
// Ensure correct values with no cache
REGENTRY_REFRESH_IF_NOCACHE
assert(nIndex <= vMultiString.size());
iType = REG_MULTI_SZ;
// Add a new string element if == elements+1
if (nIndex == vMultiString.size())
vMultiString.push_back(lpszVal);
else
vMultiString[nIndex] = lpszVal;
// Update the registry
REGENTRY_UPDATE_MULTISTRING
}
/* ===================================================
* CRegEntry::MultiGetAt(size_t nIndex)
*
* Returns a constant pointer to the string located in
* the array at the zero-based index of nIndex. Note that
* the return value is not an STL string.
*/
LPCTSTR CRegEntry::MultiGetAt(size_t nIndex) {
// Ensure correct values with no cache
REGENTRY_REFRESH_IF_NOCACHE
assert(nIndex < vMultiString.size() && IsMultiString());
return vMultiString[nIndex].c_str();
}
/* ===================================================
* CRegEntry::GetMulti(LPCTSTR lpszDest, size_t nMax)
*
* Copys the entire null-terminated array string to lpszDest.
* For Example: First String/0Second/Third/0/0
*
* Important Params:
*
* LPCTSTR lpszDest: Pointer to the character array to fill.
* size_t nMax: The maximum characters to read, including null-characters
*
* Note: By default nMax is set to _MAX_REG_VALUE, you can retrieve
* the length of the entire string by calling MultiLength().
*/
LPTSTR CRegEntry::GetMulti(LPTSTR lpszDest, size_t nMax) {
LPCTSTR strBuf;
size_t nCur = 0, nLen = 0;
assert(IsMultiString());
if (!IsMultiString()) return &(lpszDest[0] = 0);
/* If caching is disabled, refresh the entries */
REGENTRY_REFRESH_IF_NOCACHE
for (size_t n=0; n < vMultiString.size() && nCur < nMax; n++) {
strBuf = vMultiString[n].c_str();
nLen = vMultiString[n].length()+1;
_tcsncpy(lpszDest + nCur, strBuf, (nLen >= nMax ? (nMax-nCur) : nLen) * sizeof(_TCHAR));
nCur += nLen;
}
/* Add the final null termination */
*(lpszDest + nCur) = 0;
return lpszDest;
}
/* ===================================================
* CRegEntry::Delete()
*
* Removes the value from the open registry key, returns
* true on success and false on failure.
*/
bool CRegEntry::Delete() {
__bStored = false;
if (REGENTRY_KEYVALID (KEY_SET_VALUE) )
return (__cregOwner->AutoClose(), IS_ES(RegDeleteValue(__cregOwner->hKey, lpszName)));
return false;
}
// BEGIN CREGISTRY FUNCTIONS
/* ===================================================
* CRegistry CONSTRUCTOR
*
* Flags:
*
* CREG_CREATE (default) - When attempting to open a key that
* does not exist, create it.
*
* CREG_AUTOOPEN - Close the open registry key handle
* after an action has been performed with it. Opens the
* key whenever another action needs to be performed.
*
* ===================================================*/
CRegistry::CRegistry(DWORD flags) {
InitData(); __dwFlags = flags;
}
/* ===================================================
* CRegistry::InitData()
* Initializes the variables related to key locations to NULL.
*/
void CRegistry::InitData() {
_lpszSubKey = NULL;
_hRootKey = hKey = NULL;
}
/* ===================================================
* CRegistry::operator []( LPCTSTR lpszVName)
*
* OPERATOR: This will return the Registry Entry (CRegEntry) associated
* with the given value name. If the value name does not exist in
* the open key, it will be created.
*
* Note: If the value name is created, it is only stored in the actual
* registry when the entry's value has been set.
*/
CRegEntry& CRegistry::operator []( LPCTSTR lpszVName) {
size_t nValueNameLen = _tcslen(lpszVName) + 1;
assert(nValueNameLen <= _MAX_REG_VALUE);
for (int i = _reEntries.size()-1; i >=0; i--) {
if (!_tcsicmp(lpszVName, _reEntries[i]->lpszName))
return *_reEntries[i];
}
/* Entry not found */
_reEntries.push_back(new CRegEntry(this));
_reEntries.back()->lpszName = new _TCHAR[nValueNameLen];
_tcsncpy(_reEntries.back()->lpszName, lpszVName, (nValueNameLen > _MAX_REG_VALUE ? _MAX_REG_VALUE : nValueNameLen));
return *_reEntries.back();
}
/* ===================================================
* CRegistry::KeyExists()
*
* Returns true if the key exists and returns false if the key
* does not exist or could not be opened. This may be called
* as a static function.
*
* Example:
* CRegistry::KeyExists("Software//Something", HKEY_LOCAL_MACHINE);
*/
bool CRegistry::KeyExists(LPCTSTR lpszRegPath, HKEY hRootKey) {
CRegistry cregTemp( NULL );
return cregTemp.Open(lpszRegPath, hRootKey, KEY_QUERY_VALUE, true);
}
/* ===================================================
* CRegistry::SubKeyExists()
*
* Returns true if the subkey exists within the currently
* open key and false if not.
*/
bool CRegistry::SubKeyExists(LPCTSTR lpszSub) {
bool bResult;
HKEY hTemp;
if ((__dwFlags & CREG_AUTOOPEN && !AutoOpen(KEY_QUERY_VALUE)) || hKey == NULL) {
assert(hKey);
return false;
}
bResult = (RegOpenKeyEx(hKey, lpszSub, 0, KEY_QUERY_VALUE, &hTemp) == ERROR_SUCCESS);
if (bResult) RegCloseKey(hTemp);
if (__dwFlags & CREG_AUTOOPEN) AutoClose();
return bResult;
}
/* ===================================================
* CRegistry::Open(LPCTSTR lpszRegPath, HKEY hRootKey, bool bAuto)
*
* Opens the key in which values will be read and stored, if the key
* is not already existent in the registry, it will be created (if the
* CREG_CREATE) flag is present while constructing the class.
*
* Upon opening the registry key, all of the REG_DWORD and REG_SZ values
* are loaded into a new corresponding CRegEntry for future access.
*
* Important Params:
*
* LPCTSTR lpszRegPath - A NULL terminated const character array containing,
* the location of the subkey.
* For example: "SOFTWARE//Microsoft//Windows//CurrentVersion//Run"
*
* HKEY hRootKey - An open key handle to the root key. By default
* this value is set as HKEY_LOCAL_MACHINE.
* Another Example: HKEY_CURRENT_USER
*
* Returns true on success and false on failure.
*/
bool CRegistry::Open(LPCTSTR lpszRegPath, HKEY hRootKey, DWORD dwAccess, bool bAuto) {
bool bNew = true;
/* If the key is being auto opened, skip directly to opening */
if (bAuto) goto SkipNoAuto;
/* The key is being opened manually, if the key location differs
from the last opened location, clear the current entries and
store the path information for future auto opening and key
deletion using DeleteKey() */
if (_lpszSubKey){
if (_tcsicmp(lpszRegPath, _lpszSubKey)) {
/* If new key, clear any currently stored entries */
for (size_t n=0; n<_reEntries.size(); n++)
delete _reEntries[n];
_reEntries.clear();
delete [] _lpszSubKey;
} else bNew = false;
}
if (bNew) {
/* Store path information for auto opening */
_lpszSubKey = new _TCHAR[_tcslen(lpszRegPath)+1];
_tcscpy(_lpszSubKey, lpszRegPath);
}
_hRootKey = hRootKey;
SkipNoAuto:
/* This is where the key is actually opened (if all goes well).
If the key does not exist and the CREG_CREATE flag is present,
it will be created... Any currently opened key will be closed
before opening another one. After opening the key, Refresh() is
called and the key's values are stored in memory for future use. */
if (hKey != NULL) Close();
/* If auto opening is set and this is a manual opening
set the appropriate access rights */
if (__dwFlags & CREG_AUTOOPEN && !bAuto) {
dwAccess = CREG_CREATE ? KEY_CREATE_SUB_KEY | KEY_QUERY_VALUE : KEY_QUERY_VALUE;
}
/* When key creation is enabled and auto opening is disabled,
include key creation in the access rights */
else if (__dwFlags & ~CREG_AUTOOPEN && __dwFlags & CREG_CREATE)
dwAccess |= KEY_CREATE_SUB_KEY;
/* Open or create the sub key, and return the result: */
LONG lResult = (__dwFlags & CREG_CREATE ?
RegCreateKeyEx(hRootKey, lpszRegPath, 0, NULL, REG_OPTION_NON_VOLATILE, dwAccess, NULL, &hKey, NULL)
: RegOpenKeyEx(hRootKey, lpszRegPath, 0, dwAccess, &hKey));
return (lResult == ERROR_SUCCESS ? (bAuto ? true : Refresh()) : false);
}
/* ===================================================
* CRegistry::AutoOpen()
*
* If the CREG_AUTOOPEN flag is true, this function is called whenever
* an action needs to be performed involving the registry key.
*
* DWORD dwAccess controls the access required for key use.
*/
bool CRegistry::AutoOpen(DWORD dwAccess) {
assert(_lpszSubKey != NULL);
return (hKey == NULL && __dwFlags & CREG_AUTOOPEN ? Open(_lpszSubKey, _hRootKey, dwAccess, true) : true);
}
/* ===================================================
* CRegistry::AutoClose()
*
* If the CREG_AUTOOPEN flag is true, this function is called whenever
* an action has been performed on an open registry key and the key is no longer
* being accessed.
*/
void CRegistry::AutoClose() {
if (__dwFlags & CREG_AUTOOPEN) Close();
}
/* ===================================================
* CRegistry::Refresh()
*
* Enumerates all the REG_SZ, REG_BINARY and REG_DWORD values within the open
* registry key and stores them in a CRegEntry class for future
* access. Returns true on success and false on failure.
*/
bool CRegistry::Refresh() {
DWORD dwBufferSize;
DWORD dwType;
DWORD dwNameLen;
DWORD dwValueCount;
LPBYTE lpbBuffer;
DWORD dwPrevFlags = __dwFlags;
_TCHAR cValueName[_MAX_PATH];
if ((__dwFlags & CREG_AUTOOPEN && !AutoOpen(KEY_QUERY_VALUE)) || hKey == NULL)
return false;
if (NOT_ES(RegQueryInfoKey(hKey, NULL, NULL, NULL, NULL, NULL, NULL, &dwValueCount, NULL, NULL, NULL, NULL)))
return false;
lpbBuffer = new BYTE[_MAX_REG_VALUE];
/* Halt auto opening and set loading flag */
__dwFlags = (__dwFlags | CREG_LOADING) & ~CREG_AUTOOPEN;
if (dwValueCount > _reEntries.size())
_reEntries.reserve(dwValueCount);
for( DWORD dwIndex = 0; dwIndex < dwValueCount; dwIndex++) {
dwNameLen = sizeof(cValueName); dwBufferSize = _MAX_REG_VALUE;
cValueName[0] = 0;
if (NOT_ES(RegEnumValue(hKey, dwIndex, cValueName, &dwNameLen, NULL, &dwType, lpbBuffer, &dwBufferSize)))
continue;
switch (dwType) {
case REG_DWORD:
this[0][cValueName] = (LPDWORD)lpbBuffer;
break;
case REG_SZ:
this[0][cValueName] = (LPCTSTR)lpbBuffer;
break;
case REG_MULTI_SZ:
this[0][cValueName].SetMulti((LPCTSTR)lpbBuffer, dwBufferSize/sizeof(TCHAR));
break;
case REG_BINARY:
this[0][cValueName].SetBinary(lpbBuffer, (size_t)dwBufferSize);
break;
}
}
if ((__dwFlags = dwPrevFlags) & CREG_AUTOOPEN) AutoClose();
delete [] lpbBuffer;
return true;
}
/* ===================================================
* CRegistry::DeleteKey()
*
* Deletes the key which is currently opened, including any
* subkeys and values it may contain.
*
* NOTE: Use extreme caution when calling this function
*/
void CRegistry::DeleteKey() {
OSVERSIONINFO osvi;
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
if (GetVersionEx(&osvi) && osvi.dwPlatformId == VER_PLATFORM_WIN32_NT)
DeleteKey(_hRootKey, _lpszSubKey);
else
RegDeleteKey(_hRootKey, _lpszSubKey);
Close();
}
/* ===================================================
* CRegistry::DeleteKey(HKEY hPrimaryKey, LPCTSTR lpszSubKey)
*
* Private member function which is called by DeleteKey()
* This function is designed for NT based systems as it recursively
* deletes any subkeys present.
*/
void CRegistry::DeleteKey(HKEY hPrimaryKey, LPCTSTR lpszSubKey) {
DWORD dwKeyLen;
FILETIME ftTemp;
HKEY hTempKey;
LONG lResult = ERROR_SUCCESS;
LPTSTR lpszKey = new _TCHAR[_MAX_PATH];
if (!_tcslen(lpszSubKey) || !hPrimaryKey) { assert(hPrimaryKey != NULL); goto cleanup; }
if (IS_ES(RegOpenKeyEx(hPrimaryKey, lpszSubKey, 0, KEY_ENUMERATE_SUB_KEYS | KEY_WRITE, &hTempKey))){
while (IS_ES(lResult)) {
dwKeyLen = _MAX_PATH;
lResult = RegEnumKeyEx(hTempKey, 0, lpszKey, &dwKeyLen, NULL, NULL, NULL, &ftTemp);
if (lResult == ERROR_SUCCESS) DeleteKey(hTempKey, lpszKey);
else if (lResult == ERROR_NO_MORE_ITEMS) RegDeleteKey(hPrimaryKey, lpszSubKey);
}
RegCloseKey(hTempKey); hTempKey = NULL;
}
cleanup: delete [] lpszKey;
}
/* ===================================================
* CRegistry::Close()
*
* If a key is currently open, it will be closed. This should
* be called when you no longer need to access the registry key
* and the CREG_AUTOOPEN flag is not true. However, Close() is
* called on class deconstruction so it is not required.
*/
void CRegistry::Close() {
if (hKey != NULL) {
RegCloseKey(hKey); hKey = NULL;
}
}
(二)具体实施方案
1.把以上的三个文件加入到你的工程中去;
2.在MainFrm.cpp中包含相关的头文件
#include "Registry.h"
#include "RegEntry.h"
3.在MainFrm的析构函数中执行注册表的信息清理工作:
首先，获取本程序自定义的文档类型。我在网上没找着相应的解决方案，于是自己根据mfc的api自己编了一个，希望大家不要见笑，更希望大家能够提供更好的解决方案。
POSITION doc_position;
doc_position = AfxGetApp()->GetFirstDocTemplatePosition();
CString type;
AfxGetApp()->GetNextDocTemplate(doc_position)->GetDocString(type,CDocTemplate::filterExt);
然后，使用上述的封装类类删除由EnableShellOpen();RegisterShellFileTypes(TRUE);自动生成的注册表信息。主要有两项：一个以自定义的文档类型名称来命名的节点，另一个是以前一个节点的具体值来命名的节点。具体代码如下:
CRegistry reg(0 & ~CREG_CREATE),reg2(0 & ~CREG_CREATE);
CString info;
if(reg.Open(type,HKEY_CLASSES_ROOT)){
if (reg.GetAt(0)->Exists()){
if(reg.GetAt(0)->IsString())
info.Format("%s",reg.GetAt(0)->operator LPTSTR());
}
if(reg2.Open(info,HKEY_CLASSES_ROOT)){
reg2.DeleteKey();
reg.DeleteKey();
}
}
OK，现就到这里吧。有什么问题希望大家能够留下宝贵的意见。
