Tech Support > Microsoft Windows > Drivers > Registry entries for a serial port
Registry entries for a serial port
Posted by Lars Birkemose on October 2nd, 2003


Hi gurus

I have a virtual port up and running, seems to install and work fine.

Problem is, that ex HyperTerminal expects an registry entry
HKLM / HARDWARE / DEVICEMAP / SERIALCOMM / COMx

How is this entry generated ?
Do I miss a line in my INF file ?

TIA
Lars


Posted by Doron Holan [MS] on October 2nd, 2003


your driver has to write the value itself. also, are you registering for
the com port device interface as well? if not, you should be.

d

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Posted by Lars Birkemose on October 3rd, 2003


"Doron Holan [MS]" wrote...

Im not sure what you mean "registering for the com port device" ?

The installer places the virtual port under Ports, and creates it as first
available COM port.
Is that it ?

BTW
When installing, Windows automaticly figues out there are ex 2 normal COM
ports available, and names the new port COM3.
Where do I read this information when I want to create my symbolic link ?

TIA
Lars



Posted by Doron Holan [MS] on October 4th, 2003


the port name assigned to your port is under the Device Parameters key in
the registry (IoOpenDeviceRegistryKey). see the serial example, esp
SerialDoExternalNaming. By device interface i mean
IoRegisterDeviceInterface / IoSetDeviceInterfaceState. Again, see the
serial example. If you want things like TAPI to see your device, the
interface is required.

d

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Posted by Bimo on October 4th, 2003


Thanks a lot

"Doron Holan [MS]" <doronh@online.microsoft.com> skrev i en meddelelse
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