[wdmaudiodev] Re: How can I open my virtual audio driver andsend IOCTL to it?

  • From: Matt Gonzalez <matt@xxxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 09 Jun 2004 18:41:00 -0700

The create handler is there to handle requests such as CreateFile.  It won't work otherwise.

Matt


hollychen wrote:
Hi Matt,
The CreateFile( filename, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL) 
did not work.

I added the ioctl handler, but did not add create handler and close handler.
Would you please tell me why I need to add this two handler and how to implement them?

Thanks a lot.



-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Matt Gonzalez
Sent: Thursday, June 10, 2004 2:02 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: How can I open my virtual audio driver and send IOCTL to it?


Did you also add a create handler, close handler, and ioctl handler to 
your major function table in DriverEntry?

Matt


Mathieu Routhier wrote:

  
It looks like you're doing it the right way.  Try calling CreateFile 
with the following parameters instead:

CreateFile(
filename
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);

Mat

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx 
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of hollychen
(êø™Ô’=Ñаl)
Sent: Wednesday, June 09, 2004 12:35 PM
To: wdmaudiodev
Subject: [wdmaudiodev] How can I open my virtual audio driver and send 
IOCTL to it?

I'm a newbie in WDM. I wanna send IOCTL to my virtual audio driver, but 
I failed to open my driver in user-mode application.

In audio driver side, I registers an interface,

AddDevice
(
IN  PDRIVER_OBJECT          DriverObject,
IN  PDEVICE_OBJECT          PhysicalDeviceObject 
)
{
  ...
   ntStatus = 
       PcAddAdapterDevice
       ( 
           DriverObject,
           PhysicalDeviceObject,
           PCPFNSTARTDEVICE(StartDevice),
           MAX_MINIPORTS,
           0
       );
   ...
   ntStatus = IoRegisterDeviceInterface(PhysicalDeviceObject,
&GUID_DEVINTERFACE_BT_AUDIO, NULL, &ifname);
   ...
  ntStatus = IoSetDeviceInterfaceState(&ifname, TRUE);
}


///////////////////////////////////////////////////////////////////////
/
////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////

In application side,

HDEVINFO info = SetupDiGetClassDevs(&GUID_DEVINTERFACE_BT_AUDIO,
 NULL, NULL, DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);
... 
if (SetupDiEnumDeviceInterfaces(info, NULL, &GUID_DEVINTERFACE_BT_AUDIO,
0, &ifdata))
{   
 ...
 SetupDiGetDeviceInterfaceDetail(info, &ifdata, NULL, 0, &needed,
NULL);  
 
 PSP_INTERFACE_DEVICE_DETAIL_DATA detail =
(PSP_INTERFACE_DEVICE_DETAIL_DATA) malloc(needed);
 SP_DEVINFO_DATA did = {sizeof(SP_DEVINFO_DATA)};  
 detail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
 
 if (!SetupDiGetDeviceInterfaceDetail(info, &ifdata, detail, needed,
NULL, &did))   
 {  ...  }    
 ...
 strcpy(fileName, detail->DevicePath);
 ...
}  

SetupDiDestroyDeviceInfoList(info);

 ////////////////////////////////////////////////////

HANDLE hdevice = CreateFile(fileName, GENERIC_READ | GENERIC_WRITE, 0, 
NULL, OPEN_EXISTING, 0, NULL);

The CreateFile() always return 2 (ERROR_FILE_NOT_FOUND).

What's the problem with my code?
Any suggestions/hints will be much appreciated!

Holly


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