From: wangxj@i-net.com.cn
Sent: Thursday, July 12, 2001 4:58 AM
To: NT Developers Interest List
Subject: [ntdev] Re: a viatual com port driver

Yea,I have done, my code is the bellow:

   UNICODE_STRING DevName;

    RtlZeroMemory(&DevName, sizeof(UNICODE_STRING));

    DevName.MaximumLength = 128 * sizeof(WCHAR);
    DevName.Buffer = (unsigned short*)ExAllocatePool(PagedPool,
DevName.MaximumLength+sizeof(WCHAR));


    if (DevName.Buffer == NULL) {
      return STATUS_INSUFFICIENT_RESOURCES;
    }

    RtlZeroMemory(DevName.Buffer, DevName.MaximumLength + sizeof(WCHAR));
    RtlAppendUnicodeToString(&DevName, L"\\Device\\VirCom");

 status = IoCreateDevice (DriverObject,
  sizeof(VIRCOM_DEVICE_EXTENSION),
  &DevName,
  FILE_DEVICE_SERIAL_PORT,
  FILE_DEVICE_SECURE_OPEN,
  TRUE,
  &fdo);
 if( !NT_SUCCESS(status))
  return status;

 // Remember fdo in our device extension
 PWDM1_DEVICE_EXTENSION dx = (PWDM1_DEVICE_EXTENSION)fdo->DeviceExtension;
 dx->fdo = fdo;
 DebugPrint("FDO is %x",fdo);


    dx->ifSymLinkName.MaximumLength = DevName.Length + sizeof(WCHAR);
    dx->ifSymLinkName.Buffer = (unsigned short *)
      ExAllocatePool(PagedPool, DevName.MaximumLength + sizeof(WCHAR));


    if(!dx->ifSymLinkName.Buffer)
    {
        DebugPrint("Error: Couldn't allocate memory for
dx->ifSymLinkName!");
        status = STATUS_INSUFFICIENT_RESOURCES;
        return status;
    }

    RtlZeroMemory(dx->ifSymLinkName.Buffer,dx->ifSymLinkName.MaximumLength);
    RtlAppendUnicodeToString(&dx->ifSymLinkName, L"\\DosDevices\\Com");

    status = IoCreateSymbolicLink (&dx->ifSymLinkName,
                                   &DevName);

    if (!NT_SUCCESS(status)) {
        DebugPrint("Error: IoCreateSymbolicLink Failed, ErrCode =
%x",status);
  IoDeleteDevice(fdo);
  return status;
    }

    But it still not work, What wrong with me?

    Thanks in advance!

Best regards
misshome


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