C/C++枚举设备管理器上显示的物理串口（能够枚举出USB转串口等）

      调用EnumPort API可以获取到串口，并口，TCP/IP打印端口等。不过该API获取到的串口有很多不是真实的物理串口。要获取物理串口，我们可以通过串口设备类型的GUID获取设备管理器中的实际串口。如下是实现方式：

      

BOOL WcharIsDigit(WCHAR ch)
{
if(ch >= L'0' && ch <= L'9')
{
return TRUE;
}

return FALSE;
}

// The following define is from ntddser.h in the DDK. It is also
// needed for serial port enumeration.
#ifndef GUID_CLASS_COMPORT
DEFINE_GUID(GUID_CLASS_COMPORT, 0x86e0d1e0L, 0x8089, 0x11d0, 0x9c, 0xe4, \
0x08, 0x00, 0x3e, 0x30, 0x1f, 0x73);
#endif

BOOL EnumPortsWdm()
{
// Create a device information set that will be the container for
// the device interfaces.
GUID *guidDev = (GUID*) &GUID_CLASS_COMPORT;
HDEVINFO hDevInfo = INVALID_HANDLE_VALUE;
SP_DEVICE_INTERFACE_DETAIL_DATA *pDetData = NULL;

hDevInfo = SetupDiGetClassDevs( guidDev,
NULL,
NULL,
DIGCF_PRESENT | DIGCF_DEVICEINTERFACE
);

if(INVALID_HANDLE_VALUE == hDevInfo)
{
return FALSE;
}

// Enumerate the serial ports
BOOL bOk = TRUE;
SP_DEVICE_INTERFACE_DATA ifcData;
DWORD dwDetDataSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA) + 256;
pDetData = (SP_DEVICE_INTERFACE_DETAIL_DATA*)new char[dwDetDataSize];
if(!pDetData)
{
return FALSE;
}
// This is required, according to the documentation. Yes,
// it's weird.
ifcData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
pDetData->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
for (DWORD ii=0; bOk; ii++)
{
bOk = SetupDiEnumDeviceInterfaces(hDevInfo,
NULL, guidDev, ii, &ifcData);
if (bOk)
{
// Got a device. Get the details.
SP_DEVINFO_DATA devdata = {sizeof(SP_DEVINFO_DATA)};
bOk = SetupDiGetDeviceInterfaceDetail(hDevInfo,
&ifcData, pDetData, dwDetDataSize, NULL, &devdata);
if (bOk) {
// Got a path to the device. Try to get some more info.
WCHAR fname[256] = {0};
WCHAR desc[256] = {0};
BOOL bSuccess = SetupDiGetDeviceRegistryProperty(
hDevInfo, &devdata, SPDRP_FRIENDLYNAME, NULL,
(PBYTE)fname, sizeof(fname), NULL);
bSuccess = bSuccess && SetupDiGetDeviceRegistryProperty(
hDevInfo, &devdata, SPDRP_DEVICEDESC, NULL,
(PBYTE)desc, sizeof(desc), NULL);
BOOL bUsbDevice = FALSE;
WCHAR locinfo[256] = {0};
if (SetupDiGetDeviceRegistryProperty(
hDevInfo, &devdata, SPDRP_LOCATION_INFORMATION, NULL,
(PBYTE)locinfo, sizeof(locinfo), NULL))
{
// Just check the first three characters to determine
// if the port is connected to the USB bus. This isn't
// an infallible method; it would be better to use the
// BUS GUID. Currently, Windows doesn't let you query
// that though (SPDRP_BUSTYPEGUID seems to exist in
// documentation only).
bUsbDevice = (wcsncmp(locinfo,L"USB", 3)==0);
}
if (bSuccess)
{
printf("FriendlyName = %S\r\n",fname);
printf("Port Desc = %S\r\n",desc);
}

}
else
{
if (pDetData != NULL)
{
delete [] (char*)pDetData;
}
if (hDevInfo != INVALID_HANDLE_VALUE)
{
SetupDiDestroyDeviceInfoList(hDevInfo);
}
return FALSE;
}
}
else
{
DWORD err = GetLastError();
if (err != ERROR_NO_MORE_ITEMS)
{
if (pDetData != NULL)
{
delete [] (char*)pDetData;
}
if (hDevInfo != INVALID_HANDLE_VALUE)
{
SetupDiDestroyDeviceInfoList(hDevInfo);
}
return FALSE;
}
}
}

if (pDetData != NULL)
{
delete [] (char*)pDetData;
}
if (hDevInfo != INVALID_HANDLE_VALUE)
{
SetupDiDestroyDeviceInfoList(hDevInfo);
}

return TRUE;
}

int main(int argc,char* argv[])
{
setlocale(LC_ALL,"chs");
EnumPortsWdm();

getchar();
return 0;
}

       测试运行如下：

        


        如上，为了printf函数可以打印出中文，这里调用了 setlocale(LC_ALL,"chs") 函数即可正常打印出中文。