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Subject: RE: Driver help
Date: Tue, 19 Aug 2003 09:29:13 +0530
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From: "Kiran Bacche" <kiran DOT bacche AT wipro DOT com>
To: "Marcel Telka" <marcel AT telka DOT sk>, <cygwin AT cygwin DOT com>
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Thanks Marcel Telka,
I am now able to successfully do CreateFile(...)..with my loaded driver.

Cheers
  Kiran

-----Original Message-----
From: Marcel Telka [mailto:marcel AT telka DOT sk] 
Sent: Monday, August 18, 2003 6:19 PM
To: cygwin AT cygwin DOT 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 AT telka DOT sk  |
|                homepage: http://telka.sk/ |
|                jabber:   marcel AT jabber DOT sk |
+-------------------------------------------+

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