What shall I do about Virtual Serial Port

NTDEV
1

Hi, all

I found something to make a Virtual Serial Port in NewsGroups of Google,
Here are the steps:

  1. Write a bus driver (which would act as a function driver for a USB
    device or some other device that enumlates com ports) and enumerate PDOs
    (raw capable) for each virtual port.
  2. Name the PDO as \Device\XYZ. (XYZ is your company name)
  3. Use a Port Class NULL INF to install the enumerated device.
  4. In the StartDevice, create a symbolic link using the PortName value
    created in the devnode registry by the classinstaller.
  5. Handle all the necessary serial port IRPs in your bus driver to provide
    the required functionality.

The following is what I have done:
1)I Create a bus driver FDO based on the Toaster Bus in NTDDK
2)I modified the
status = IoCreateDevice(FdoData->Self->DriverObject,
sizeof (PDO_DEVICE_DATA),
NULL,
FILE_DEVICE_BUS_EXTENDER,
FILE_AUTOGENERATED_DEVICE_NAME |FILE_DEVICE_SECURE_OPEN,
FALSE,
&pdo);
into
status = IoCreateDevice(FdoData->Self->DriverObject,
sizeof (PDO_DEVICE_DATA),
&deviceName,
FILE_DEVICE_SERIAL_PORT,
FILE_DEVICE_SECURE_OPEN,
TRUE,
&pdo);
and I added codes to create a symbolic link & make sure the child device
is above the bus driver.
…
pdoData = (PPDO_DEVICE_DATA) pdo->DeviceExtension;
pdoData->IsFDO = FALSE;
pdoData->Self = pdo;
pdoData->ParentFdo = FdoData->Self;
pdoData->Self->Flags &= ~DO_DEVICE_INITIALIZING;
…
IoOpenDeviceRegistryKey
IoCreateSymbolicLink
…

All of these in the Bus_PlugInDevice function
I can use “enum -p 1” to create a port driver(displayed a COM port in the
Device Manager), but in HyperTerminal I can’t find any COM port of my own.

I know something was wrong, but I still can not find them, and I still
have no idea to make the Serial(the sample of NTDDK, it has a lot of
hardware configuration) into Virtual device, all of the hardware
configuration should be made by software.

Needs someone’s help

Regards
Daniel

2

I posted a reply to this in microsoft.public.development.device.drivers.

Essentially you need to go back and re-read that Google post, it answers
all of your questions already. In fact Eliyas could not have done a
better job had he held our hand through the process.

–
Bill McKenzie
Compuware Corporation
Watch your IRPs/IRBs/URBs/SRBs/NDIS pkts with our free WDMSniffer tool:
http://frontline.compuware.com/nashua/patches/utility.htm

Hi, all

I found something to make a Virtual Serial Port in NewsGroups of Google,
Here are the steps:

  1. Write a bus driver (which would act as a function driver for a USB
    device or some other device that enumlates com ports) and enumerate PDOs
    (raw capable) for each virtual port.
  2. Name the PDO as \Device\XYZ. (XYZ is your company name)
  3. Use a Port Class NULL INF to install the enumerated device.
  4. In the StartDevice, create a symbolic link using the PortName value
    created in the devnode registry by the classinstaller.
  5. Handle all the necessary serial port IRPs in your bus driver to provide
    the required functionality.

The following is what I have done:
1)I Create a bus driver FDO based on the Toaster Bus in NTDDK
2)I modified the
status = IoCreateDevice(FdoData->Self->DriverObject,
sizeof (PDO_DEVICE_DATA),
NULL,
FILE_DEVICE_BUS_EXTENDER,
FILE_AUTOGENERATED_DEVICE_NAME |FILE_DEVICE_SECURE_OPEN,
FALSE,
&pdo);
into
status = IoCreateDevice(FdoData->Self->DriverObject,
sizeof (PDO_DEVICE_DATA),
&deviceName,
FILE_DEVICE_SERIAL_PORT,
FILE_DEVICE_SECURE_OPEN,
TRUE,
&pdo);
and I added codes to create a symbolic link & make sure the child device
is above the bus driver.
…
pdoData = (PPDO_DEVICE_DATA) pdo->DeviceExtension;
pdoData->IsFDO = FALSE;
pdoData->Self = pdo;
pdoData->ParentFdo = FdoData->Self;
pdoData->Self->Flags &= ~DO_DEVICE_INITIALIZING;
…
IoOpenDeviceRegistryKey
IoCreateSymbolicLink
…

All of these in the Bus_PlugInDevice function
I can use “enum -p 1” to create a port driver(displayed a COM port in the
Device Manager), but in HyperTerminal I can’t find any COM port of my own.

I know something was wrong, but I still can not find them, and I still
have no idea to make the Serial(the sample of NTDDK, it has a lot of
hardware configuration) into Virtual device, all of the hardware
configuration should be made by software.

Needs someone’s help

Regards
Daniel