RE: Driver help

["Kiran Bacche" <kiran dot bacche at wipro dot com>]

Thanks Marcel Telka,
I am now able to successfully do CreateFile(...)..with my loaded driver.

Cheers
  Kiran

-----Original Message-----
From: Marcel Telka [mailto:marcel@telka.sk] 
Sent: Monday, August 18, 2003 6:19 PM
To: cygwin@cygwin.com
Cc: Kiran Bacche
Subject: Re: Driver help


Hi Kiran.

On 2003.08.18 07:43, Kiran Bacche wrote:
> The ioperm package was very helpful. Thanks for that.
> U was now able to compile a sample driver into a .sys file.
> I used the SCOpenManager and CreateProcess to get it loaded.

Try use CreateService() to install the driver and StartService() to 
start it. And please see admin directory in ioperm sources.

> 
> So in effeect, when a write an application program
> ││hPort = CreateFile(
> │                       "\\DosDevices\\mydevice",
> │                       0,
> │                       0,
> │                       NULL,
> │                       0,
> │                       0,
> │                       NULL);
> │
> │if (hPort == (HANDLE)-1)
> │    {
> │    printf("Open failed :%lx\n",hCommPort);
> │    return -1;
> │    }
> 
> I thought it would succeed. But CreateFile failed!
> 
> What may be the reason? A snippet of the CYGWIN code for win driver is
> as follows:
> 
>  RtlInitUnicodeString( &DeviceName, L"\\Device\\mydevice" );
>  RtlInitUnicodeString( &SymbolicLinkName, L"\\DosDevices\
> \mydevice" );
>  IoCreateDevice( DriverObject, 0, &DeviceName, ...
>  IoCreateSymbolicLink( &SymbolicLinkName, &DeviceName...


Regards.

-- 
+-------------------------------------------+
| Marcel Telka   e-mail:   marcel@telka.sk  |
|                homepage: http://telka.sk/ |
|                jabber:   marcel@jabber.sk |
+-------------------------------------------+

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