How to Register a Program

const bool CRegistryAccess::CreateKey(const CString &cstrBranch, const CString &cstrKeyName)
// This is to create a variable in the registry (without setting it). Return T on success and F if not.
{
	TRY
	{
		HKEY hKey = (HKEY)NULL;
		TCHAR szName[MAX_KEY_LENGTH] = _T("");
		::wsprintf(szName, TEXT("%s\\%s"), (LPCTSTR)cstrBranch, (LPCTSTR)cstrKeyName); 
		DWORD dwDisp = 0;
		bool bResult = (::RegCreateKeyEx(
			m_hKeyCurrentUser, 
			szName, 
			0, 
			NULL, 
			REG_OPTION_NON_VOLATILE, 
			KEY_FULL_ACCESS, 
			NULL, 
			&hKey, 
			&dwDisp) == ERROR_SUCCESS);
		if(!bResult)
		{
			#ifdef _DEBUG
			if(m_bHiddenKey)
				bResult = (::GetLastError() == 0);
			else
				::ShowLastError(_T("RegCreateKeyEx"));
			#endif
		}
		// Return T on success and F if not.
		return bResult;
	}
	CATCH_ALL(e)
	{
		WNDTRACEEXCEPTION_USERDLG("CRegistryAccess", "CreateKey", "", e);
		THROW_LAST();
	}
	END_CATCH_ALL
	return false;
}

const bool CRegistryAccess::EnumKey(CONST DWORD dwIndex, HKEY &hKey, CString &cstrKeyName)
// Enum one key on a open key handle.
{
	TRY
	{
		LONG lResult = ERROR_SUCCESS;
		TCHAR szName[MAX_KEY_LENGTH] = _T("");
		DWORD dwSize = MAX_KEY_LENGTH;
		FILETIME ftWrite;
		cstrKeyName.Empty();
		lResult = ::RegEnumKeyEx(
			hKey, 
			dwIndex, 
			szName, 
			&dwSize, 
			NULL, 
			NULL, 
			NULL, 
			&ftWrite);
		if(lResult == ERROR_SUCCESS)
		{
			// Got the one we wanted.
			cstrKeyName.Format(TEXT("%s"), szName);
			return true;
		}
		#ifdef _DEBUG
		if(!m_bHiddenKey)
			::ShowLastError(_T("RegEnumKeyEx"));
		#endif
		return false;
	}
	CATCH_ALL(e)
	{
		WNDTRACEEXCEPTION_USERDLG("CRegistryAccess", "EnumKey", "", e);
		THROW_LAST();
	}
	END_CATCH_ALL
	return false;
}

const void CRegistryAccess::EnumKeys(const CString &cstrBranch, CStringArray &sarrKeys)
// Return keys under this branch as string array.
{
	TRY
	{
		HKEY hKey = (HKEY)NULL;
		sarrKeys.RemoveAll();
		sarrKeys.SetSize(0, 1);
		if(OpenKey(cstrBranch, hKey))
		{
			CString cstrKeyName(_T(""));
			for(DWORD dwIndex = 0; EnumKey(dwIndex, hKey, cstrKeyName); dwIndex++)
				// Collect it.
				sarrKeys.Add(cstrKeyName);
			CloseKey(hKey);
		}
	}
	CATCH_ALL(e)
	{
		WNDTRACEEXCEPTION_USERDLG("CRegistryAccess", "EnumKeys", "", e);
		THROW_LAST();
	}
	END_CATCH_ALL
}