枚举计算机的串口函数

这个函数是读注册表的

void FindCommPort(CComboBox   *pComboBox )   
{   
       HKEY   hKey;   
#ifdef   _DEBUG   
       ASSERT(   pComboBox   !=   NULL   );   
       pComboBox->AssertValid();   
#endif 
       if(::RegOpenKeyEx(   HKEY_LOCAL_MACHINE,   
              "Hardware\\DeviceMap\\SerialComm",   
              NULL,   
              KEY_READ,   
              &hKey )   ==   ERROR_SUCCESS )   //打开串口注册表对应的键值   
              {   
              int   i=0;   
              char   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("在HKEY_LOCAL_MACHINE:Hardware\\DeviceMap\\SerialComm里找不到串口!!!");   
              }   
               
              RegCloseKey(hKey);   
       }   
}