wconsd

Look at http://msdn2.microsoft.com/en-us/library/ms535797.aspx

also, this example code: http://www.lookrs232.com/com_port_programming/api_enumports.htm

I have done some research and this appears to be more difficult than it should be.

• PORT_INFO_2 doesn't provide much information (http://msdn2.microsoft.com/en-us/library/ms535509(VS.85).aspx)

nrports=12
Port       Monitor         Desc            Type Reserved
Microsoft Document Imaging Writer Port: Local Monitor   Local Port         1        0
COM1:      Local Monitor   Local Port         1        0
COM2:      Local Monitor   Local Port         1        0
COM3:      Local Monitor   Local Port         1        0
COM4:      Local Monitor   Local Port         1        0
FILE:      Local Monitor   Local Port         1        0
LPT1:      Local Monitor   Local Port         1        0
LPT2:      Local Monitor   Local Port         1        0
LPT3:      Local Monitor   Local Port         1        0
COM5:      Local Monitor   Local Port         1        0
COM6:      Local Monitor   Local Port         1        0
IcePortER: Ice Monitor E   Black Ice Port     1        0

• SetupDiEnumDeviceInterfaces (http://forum.sysinternals.com/forum_posts.asp?TID=4544 and http://msdn2.microsoft.com/en-us/library/ms793116.aspx) doesnt find enough interfaces:

DevicePath=\\?\acpi#pnp0501!#1#{4d36e978-e325-11ce-bfc1-08002be10318}
DevicePath=\\?\acpi#pnp0501!#2#{4d36e978-e325-11ce-bfc1-08002be10318}

• There is an entire library for doing this (http://www.naughter.com/enumser.html) that checks seven different methods for com ports, but its licence may be incompatible with GPL