枚举 pc 上的串口设备

void Cdemo_print_win32_cDlg::OnBnClickedButton1()
{
// TODO: Add your control notification handler code here
//m_ComboBox
CString strCom;
int nCom = 5;
int count = 0;
HANDLE hCom;
do{
nCom++;
strCom.Format( L"COM%d ", nCom);

hCom = CreateFile(strCom, 0, 0, 0,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

if(INVALID_HANDLE_VALUE == hCom )
break;
m_ComboBox.AddString(strCom);
CloseHandle(hCom);
} while(1);
}