我初學VC++ 2005, 下面這段代碼無法讀取註冊表內容，請各位高手幫忙看看問題出在哪里, 為什么無法打開和讀取失敗?輸出結果是Open false  read false.
註冊表HKEY_LOCAL_MACHINE\SOFTWARE\McNeel\Rhinoceros\4.0下
MostRecent值為2007-01-18 類型為REG_SZ

RegisterPlugin myPlug;
LPCTSTR subKey;
LPCTSTR reName;
subKey=(LPCTSTR)"SOFTWARE\\McNeel\\Rhinoceros\\4.0";
if (myPlug.Open(subKey))
  cout<<"Open True";
else
  cout<<"Open False";
cout<<"\n";
reName=(LPCTSTR)"MostRecent";
CString* lpVal=new CString;
if (myPlug.Read(reName,lpVal))
   cout<< "read True";
else
  cout<< "read False";

RegisterPlugin類如下:
class RegisterPlugin
{
public:
    RegisterPlugin(HKEY hKey=HKEY_LOCAL_MACHINE);
    ~RegisterPlugin(void);
    BOOL Read(LPCTSTR lpValueName, CString* lpVal);
    void Close();
    BOOL Open(LPCTSTR lpSubKey);

protected:
    HKEY m_hKey;
};
RegisterPlugin::RegisterPlugin(HKEY hKey)
{
    m_hKey=hKey;;
}
RegisterPlugin::~RegisterPlugin()
{
    Close();
}

BOOL RegisterPlugin::Open(LPCTSTR lpSubKey)
{
  
    HKEY hKey;
    long lReturn=RegOpenKeyEx(m_hKey,lpSubKey,0L,KEY_ALL_ACCESS,&hKey);
    
    if(lReturn==ERROR_SUCCESS)
    {
        m_hKey=hKey;
        return TRUE;
    }
    return FALSE;
    
}

void RegisterPlugin::Close()
{
    if(m_hKey)
    {
        RegCloseKey(m_hKey);
        m_hKey=NULL;
    }

}

BOOL RegisterPlugin::Read(LPCTSTR lpValueName, CString* lpVal)
{
    
    DWORD dwType;
    DWORD dwSize=200;
    char szString[2550];
    
    long lReturn=RegQueryValueEx(m_hKey,lpValueName,NULL,&dwType,(BYTE *)szString,&dwSize);
    
    if(lReturn==ERROR_SUCCESS)
    {
        *lpVal=szString;
        return TRUE;
    }
    return FALSE;
    
}