Hi all

I need to enumarate all COM ports and store their paths. Now I can do almost
everything what I need:
I use SetupDiEnumDeviceInfo to iterate through all ports. By this I find all
ports in the system including LPT and COM.
I add to the list only COM ports, and I have them with path COM1, COM2, etc.
But I know, that in the system they have other real paths, e.g.
\\?\acpi#pnp0501#1#{4d36e978-e325-11ce-bfc1-08002be10318
How to get this type of path?

Please help

Why storing the paths? Not necessary at all. Just re-run
SetupDiGetClassDevs each time you need to open a COM port.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com


"Eugen" <zhenja@zlo.ee> wrote in message
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Use QueryDosDevices to obtain a list of all symbolic links.

"Eugen" <zhenja@zlo.ee> wrote in message
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use SetupDiGetClassDevs with the DIGCF_DEVICEINTERFACE flag, and
specify the GUID for the COM port device interface class,
GUID_DEVINTERFACE_COMPORT. this retrieves a set of COM port
device interfaces.

SetupDiGetClassDevs:
http://msdn.microsoft.com/library/en...tclassdevs.asp

ClassGuid
[in] Pointer to a class GUID for a setup class or an interface class.
If the DIGCF_DEVICEINTERFACE flag is set, ClassGuid represents an
interface class; otherwise, ClassGuid represents a setup class.

enumerate the device info set with SetupDiEnumDeviceInterfaces, also
specifying the GUID_DEVINTERFACE_COMPORT class GUID.

SetupDiEnumDeviceInterfaces:
http://msdn.microsoft.com/library/en...interfaces.asp

for each enumerated device interface (PSP_DEVICE_INTERFACE_DATA ),
you can retrieve the symbolic link to the device with:

SetupDiGetDeviceInterfaceDetail:
http://msdn.microsoft.com/library/en...facedetail.asp

the symbolic link is the DevicePath field of the
SP_DEVICE_INTERFACE_DETAIL_DATA structure.

with SetupDiGetDeviceInterfaceDetail, you can also get the PSP_DEVINFO_DATA
representing the device that the interface is registered against.

if you also want the COM port name, it is stored as a reg value in the
device's hardware key.

Registry Settings for a Plug and Play COM Port:
http://msdn.microsoft.com/library/en...seovr_4unb.asp

All the following registry settings are under the Plug and Play registry
key for a COM port.

PortName
The PortName entry value specifies the name of the COM port. The name of
a COM port is typically COM<n>. However, a COM port name can be set to
any non-NULL string. Serial uses the port name to create a symbolic link
to the COM port that is visible in user-mode. PortName is a REG_SZ and
the default value is an empty string.


use SetupDiOpenDevRegKey and specify the DIREG_DEV key type to open
the device's hardware key.

SetupDiOpenDevRegKey
http://msdn.microsoft.com/library/en...-rtns_8g36.asp

SetupDiOpenDevRegKey opens a registry storage key for device-specific
configuration information and returns a handle to the key.

KeyType
DIREG_DEV -- Open a hardware key for the device.

hope this helps,
jim.

--
This posting is provided "AS IS" with no warranties, and confers no rights.


"Eugen" <zhenja@zlo.ee> wrote in message
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