asked on

CreateFile to open a filter driver

Hi,
I am using the Filemon code available on net and I am trying to write an application, of
my own to make IOCTL calls into the Filemon driver. When my application calls CreateFile()
i get an error ERROR_FILE_NOT_FOUND

if((SysHandle = CreateFile( "\\\\.\\FILEMON", // lpFileName        GENERIC_READ | GENERIC_WRITE,            // dwDesiredAccess
              FILE_SHARE_READ | FILE_SHARE_WRITE,      // dwShareMode
NULL,       // lpSecurityAttributes
OPEN_EXISTING,       // dwCreationDistribution
FILE_ATTRIBUTE_NORMAL,             // dwFlagsAndAttributes
NULL      // hTemplateFile
)) == INVALID_HANDLE_VALUE

Could someone please help !!

Regards,
Lib
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ASKER CERTIFIED SOLUTION

AlexFM

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SOLUTION

jkr

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lib7

ASKER

Hi ,
Thanx for your replies.

I am using the entire code of filemon as it is !
I am just writting an application of my own which will make IOCTL calls into the filemon driver. To communicate with the driver i am getting the handle to it through the CreateFile() call.

To test the application -- i am first running the Filemon.exe (GUI part) which should install the driver. And then i am running my application. And i am getting the error code 5 this time ie ACCESS DENIED.!

Is it true that two applications cannot get a handle to the same driver at the same time?
This could be happening in this case ?

Lib7
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jkr

>>Is it true that two applications cannot get a handle to the same driver at the same time?

Depends on the driver design. In case of FileMon, it would make sense. So, I suggest you load and start filemon.sys from your own application.