From: xuye [xu_ye@genius-soft.com]
Sent: Thursday, July 12, 2001 6:56 AM
To: NT Developers Interest List
Subject: [ntdev] Re: a viatual com port driver

try this:

 UNICODE_STRING DevName;
 RtlInitUnicodeString(&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);

 RtlInitUnicodeString(&dx->ifSymLinkName, L"\\DosDevices\\Com");

    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;
 }


----- Original Message ----- 
From: <wangxj@i-net.com.cn>
To: "NT Developers Interest List" <ntdev@lists.osr.com>
Sent: Thursday, July 12, 2001 4:57 PM
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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