从注册表获取所有的串口[Windows]

if(::RegOpenKeyEx(   HKEY_LOCAL_MACHINE,
_T("Hardware//DeviceMap//SerialComm"),
NULL,
KEY_READ,
&hKey )   ==   ERROR_SUCCESS )   //打开串口注册表对应的键值
{
int i=0;
TCHAR portName[256],commName[256];
DWORD dwLong,dwSize;
while(1)
{
dwLong   =   dwSize   =   sizeof(portName);
if( ::RegEnumValue(hKey,
i,
portName,
&dwLong,
NULL,
NULL,
(PUCHAR)commName,
&dwSize   )   ==   ERROR_NO_MORE_ITEMS )//   枚举串口
break;
pComboBox->AddString(   commName   );   // commName就是串口名字
i++;
}
if(   pComboBox->GetCount()   ==   0   )
{
::AfxMessageBox(_T("在HKEY_LOCAL_MACHINE:Hardware//DeviceMap//SerialComm里找不到串口!!!"));
}
RegCloseKey(hKey);
}