CReg类轻松读取注册表

//========================================================================//TITLE://    CReg类轻松读取注册表//AUTHOR://    norains//DATE://    Sunday  8-April-2007//Environment://        EVC4.0 + Standard SDK//========================================================================

       开篇之处先说说这个类的来历.准确的说,这个类是我垂诞已久的东东,昨天在查看微软的控制面板的代码时,不小心发现的.觉得使用上挺便利的,所以本着"洋为中用"的原则,拷贝出来用吧!         

/**//////////////////////////////////////////////////////////////////////        // Reg.h: interface for the CReg class.////Version://    1.0.0//Date://    2007.04.07/**///////////////////////////////////////////////////////////////////////#ifndef REG_H#define REG_H class CReg  ...{public:    BOOL DeleteKey(LPCTSTR szName);    BOOL DeleteValue(LPCTSTR szName);    BOOL SetMultiSZ(LPCTSTR szName, LPCTSTR lpszValue, DWORD dwLen);    BOOL SetBinary(LPCTSTR szName, LPBYTE lpbValue, DWORD dwLen);    BOOL SetDW(LPCTSTR szName, DWORD dwValue);    BOOL SetSZ(LPCTSTR szName, LPCTSTR szValue);    BOOL SetSZ(LPCTSTR szName, LPCTSTR szValue, DWORD dwLen);    DWORD GetValueDW(LPCTSTR szName, DWORD dwDefault=0);    LPCTSTR GetValueSZ(LPCTSTR szName);    LPBYTE GetValueBinary(LPCTSTR szName);    DWORD GetValueBinary(LPCTSTR szName, LPBYTE lpbValue, DWORD dwLen);    BOOL GetValueSZ(LPCTSTR szName, LPTSTR szValue, DWORD dwLen);    BOOL EnumValue(LPTSTR pszName, DWORD dwLenName, LPTSTR pszValue, DWORD dwLenValue);    BOOL EnumKey(LPTSTR psz, DWORD dwLen);    BOOL IsOK();    operator HKEY();    void Reset();    CReg(HKEY hkRoot, LPCTSTR pszKey);    BOOL Open(HKEY hkRoot, LPCTSTR pszKey, REGSAM sam=KEY_READ);    BOOL Create(HKEY hkRoot, LPCTSTR pszKey);    CReg();    virtual ~CReg();private:    HKEY    m_hKey;    int        m_Index;    LPBYTE    m_lpbValue; // last value read, if any};#endif //#ifndef REG_H//////////////////////////////////////////////////////////////////////// Reg.cpp: implementation of the CReg class.///**///////////////////////////////////////////////////////////////////////#include "stdafx.h"#include "Reg.h"//=======================================================================//Macro define#define MyFree(p)            { if(p) LocalFree(p); }//=======================================================================/**///////////////////////////////////////////////////////////////////////// Construction/Destruction/**///////////////////////////////////////////////////////////////////////CReg::CReg()...{    m_hKey = NULL;    m_Index = 0;    m_lpbValue = NULL;}CReg::CReg(HKEY hkRoot, LPCTSTR pszKey)...{    m_hKey = NULL;    m_Index = 0;    m_lpbValue = NULL;    Open(hkRoot, pszKey);}CReg::~CReg()...{    if(m_hKey)    ...{        RegCloseKey(m_hKey);    }    MyFree(m_lpbValue);}//-------------------------------------------------------------------//Description://    Create the key//-------------------------------------------------------------------BOOL CReg::Create(HKEY hkRoot, LPCTSTR pszKey)...{    DWORD dwDisp;    return ERROR_SUCCESS == RegCreateKeyEx(hkRoot, pszKey, 0, NULL, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &m_hKey, &dwDisp);}//-------------------------------------------------------------------//Description://    Open the key//-------------------------------------------------------------------BOOL CReg::Open(HKEY hkRoot, LPCTSTR pszKey, REGSAM sam)...{    return ERROR_SUCCESS == RegOpenKeyEx(hkRoot, pszKey, 0, sam, &m_hKey);}//-------------------------------------------------------------------//Description://    Reset the value//-------------------------------------------------------------------void CReg::Reset()...{    if(m_hKey)    ...{        RegCloseKey(m_hKey);     }    MyFree(m_lpbValue);    m_hKey = NULL;    m_Index = 0;    m_lpbValue = NULL;}//-------------------------------------------------------------------//Description://    Operator overload//-------------------------------------------------------------------CReg::operator HKEY()...{    return m_hKey;}//-------------------------------------------------------------------//Description://    Test whether is the handle of the key OK for next operate//-------------------------------------------------------------------BOOL CReg::IsOK()...{    return m_hKey != NULL;}//-------------------------------------------------------------------//Description://    Enum the key//-------------------------------------------------------------------BOOL CReg::EnumKey(LPTSTR psz, DWORD dwLen)...{    if(!m_hKey)    ...{        return FALSE;    }        return ERROR_SUCCESS == RegEnumKeyEx(m_hKey, m_Index++, psz, &dwLen, NULL, NULL, NULL, NULL);}//-------------------------------------------------------------------//Description://    Enum registry Value//-------------------------------------------------------------------BOOL CReg::EnumValue(LPTSTR pszName, DWORD dwLenName, LPTSTR pszValue, DWORD dwLenValue)...{    DWORD dwType;    if(!m_hKey)     ...{        return FALSE;    }        dwLenValue *= sizeof(TCHAR); // convert length in chars to bytes        return ERROR_SUCCESS == RegEnumValue(m_hKey, m_Index++, pszName, &dwLenName, NULL, &dwType, (LPBYTE)pszValue, &dwLenValue);}//-------------------------------------------------------------------//Description://    Get the string value//-------------------------------------------------------------------BOOL CReg::GetValueSZ(LPCTSTR szName, LPTSTR szValue, DWORD dwLen)...{    if(!m_hKey)    ...{        return FALSE;    }        dwLen *= sizeof(TCHAR); // convert length in chars to bytes        return ERROR_SUCCESS == RegQueryValueEx(m_hKey, szName, NULL, NULL, (LPBYTE)szValue, &dwLen);}//-------------------------------------------------------------------//Description://    Get the binary value//-------------------------------------------------------------------DWORD CReg::GetValueBinary(LPCTSTR szName, LPBYTE lpbValue, DWORD dwLen)...{    if(!m_hKey)     ...{        return FALSE;    }    DWORD dwLenWant = dwLen;    if(ERROR_SUCCESS == RegQueryValueEx(m_hKey, szName, NULL, NULL, lpbValue, &dwLen))    ...{        return dwLen;    }    else    ...{        return 0;    }}//-------------------------------------------------------------------//Description://    Get the binary value//-------------------------------------------------------------------LPBYTE CReg::GetValueBinary(LPCTSTR szName)...{    return (LPBYTE)GetValueSZ(szName);}//-------------------------------------------------------------------//Description://    Get the string value//-------------------------------------------------------------------LPCTSTR CReg::GetValueSZ(LPCTSTR szName)...{    return 0;}//-------------------------------------------------------------------//Description://    Get the DWORD value////Parameters://    szName:[in] The value of registry//    dwDefault:[in] The default value return when failed in getting the //DWORD value.//-------------------------------------------------------------------DWORD CReg::GetValueDW(LPCTSTR szName, DWORD dwDefault)...{    if(!m_hKey)     ...{        return FALSE;    }    DWORD dwValue = dwDefault;    DWORD dwLen = sizeof(DWORD);    RegQueryValueEx(m_hKey, szName, NULL, NULL, (LPBYTE)&dwValue, &dwLen);    return dwValue;}//-------------------------------------------------------------------//Description://    Set the string value//-------------------------------------------------------------------BOOL CReg::SetSZ(LPCTSTR szName, LPCTSTR szValue, DWORD dwLen)...{    //Prefix    if(!m_hKey)     ...{        return FALSE;    }        return ERROR_SUCCESS == RegSetValueEx(m_hKey, szName, 0, REG_SZ, (LPBYTE)szValue, sizeof(TCHAR)*dwLen);}//-------------------------------------------------------------------//Description://    Set the string value//-------------------------------------------------------------------BOOL CReg::SetSZ(LPCTSTR szName, LPCTSTR szValue)...{    return SetSZ(szName, szValue, 1+lstrlen(szValue));}//-------------------------------------------------------------------//Description://    Get the DWORD value//-------------------------------------------------------------------BOOL CReg::SetDW(LPCTSTR szName, DWORD dwValue)...{    //Prefix    if(!m_hKey)     ...{        return FALSE;    }        return ERROR_SUCCESS==RegSetValueEx(m_hKey, szName, 0, REG_DWORD, (LPBYTE)&dwValue, sizeof(DWORD));}//-------------------------------------------------------------------//Description://    Get the binary value//-------------------------------------------------------------------BOOL CReg::SetBinary(LPCTSTR szName, LPBYTE lpbValue, DWORD dwLen)...{    //Prefix    if(!m_hKey)     ...{        return FALSE;    }    return ERROR_SUCCESS == RegSetValueEx(m_hKey, szName, 0, REG_BINARY, lpbValue, dwLen);}//-------------------------------------------------------------------//Description://    Set the Multi value//-------------------------------------------------------------------BOOL CReg::SetMultiSZ(LPCTSTR szName, LPCTSTR lpszValue, DWORD dwLen)...{    return ERROR_SUCCESS == RegSetValueEx(m_hKey, szName, 0, REG_MULTI_SZ, (LPBYTE)lpszValue, sizeof(TCHAR)*dwLen);}//-------------------------------------------------------------------//Description://    Delete the value//-------------------------------------------------------------------BOOL CReg::DeleteValue(LPCTSTR szName)...{    //Prefix    if(!m_hKey)     ...{        return FALSE;    }    //    return ERROR_SUCCESS == RegDeleteValue(m_hKey, szName);} //-------------------------------------------------------------------//Description://    Delete Key//-------------------------------------------------------------------BOOL CReg::DeleteKey(LPCTSTR szName)...{    if(!m_hKey)     ...{        return FALSE;    }        return ERROR_SUCCESS == RegDeleteKey(m_hKey, szName);}

        使用CReg类读取注册表非常方便,至少不用再去翻查platform builder文档上的注册表函数了^_^.
        
        以将注册表中"HKEY_CURRENT_USER/ControlPanel/Volume"的"Screen"(DWORD类型)数值设置为2作例子:  CReg reg(HKEY_CURRENT_USER,TEXT("ControlPanel/Volume"));
 reg.SetDW(TEXT("Screen"),Screen);
        要读取也挺简单:
DWORD dwValue = reg.GetValueDW(TEXT("Screen"));
        其它函数的功能,可以依照函数名推断,并且使用方法也很简单,在此不再赘述.