{
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i = 0;
hDevInfo = SetupDiGetClassDevs((LPGUID) &GUID_DEVCLASS_PORTS, 0, 0,DIGCF_PRESENT);
/*
GUID_DEVCLASS_FDC软盘控制器
GUID_DEVCLASS_DISPLAY显示卡
GUID_DEVCLASS_CDROM光驱
GUID_DEVCLASS_KEYBOARD键盘
GUID_DEVCLASS_COMPUTER计算机
GUID_DEVCLASS_SYSTEM系统
GUID_DEVCLASS_DISKDRIVE磁盘驱动器
GUID_DEVCLASS_MEDIA声音、视频和游戏控制器
GUID_DEVCLASS_MODEMMODEM
GUID_DEVCLASS_MOUSE鼠标和其他指针设备
GUID_DEVCLASS_NET网络设备器
GUID_DEVCLASS_USB通用串行总线控制器
GUID_DEVCLASS_FLOPPYDISK软盘驱动器
GUID_DEVCLASS_UNKNOWN未知设备
GUID_DEVCLASS_SCSIADAPTERSCSI 和 RAID 控制器
GUID_DEVCLASS_HDCIDE ATA/ATAPI 控制器
GUID_DEVCLASS_PORTS端口（COM 和 LPT）
GUID_DEVCLASS_MONITOR监视器
*/
if (hDevInfo == INVALID_HANDLE_VALUE)
{
DWORD dwError = GetLastError();
// Insert error handling here.
return ;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for(i = 0; SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData); i++)
{
DWORD DataT = 0;
char buffer[256] = {0};
DWORD buffersize = sizeof(buffer);
while (!SetupDiGetDeviceRegistryProperty(hDevInfo,
&DeviceInfoData,
SPDRP_FRIENDLYNAME,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if(GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
// Change the buffer size.
//if (buffer) LocalFree(buffer);
}
else
{
// Insert error handling here.
//cout << “Friend Name is ” << buffer << endl;
break;
}
}
cout << “Friend Name is ” << buffer << endl;
if(buffer)
{
LocalFree(buffer);
}
}
if(GetLastError() != NO_ERROR && GetLastError() != ERROR_NO_MORE_ITEMS)
{
return ;
}
// Cleanup
SetupDiDestroyDeviceInfoList(hDevInfo);
}
这段代码可以获取到COM口在设备管理器的端口节点下的描述信息，比如“XXXXXXX （COMXX）”。