This has been discussed repeatedly on this list. Please search the archives; you need to handle IRP_MJ_CREATE and IRP_MJ_CLOSE.
Vipin Kumar wrote:
Hi,
since i am writing an virtual microphone driver, i definitely want it to
take data from usermode,( ofcourse via IOCTL).
i have written few drivers but never a WDM audio one
However when i call createfile, it fails.
This is code
in the DriverEntry
DriverObject->MajorFunction [IRP_MJ_DEVICE_CONTROL] =
IoCtlHandler;
in ADD device
Status = IoRegisterDeviceInterface( PhysicalDeviceObject, &AD_COMM_GUID
, NULL , &InstanceString);
DbgPrint(" Registered Device Status %d Name Length %d \n" ,
Status,InstanceString.Length);
if(NT_SUCCESS( ntStatus)){
Status = IoSetDeviceInterfaceState(&InstanceString,TRUE); //
make it ready for communication
DbgPrint(" Ready for Communication Status %d \n" , Status);
}
All the status are STATUS_SUCCESS.
I use SetupDiEnumDeviceInterfaces, SetupDiGetDeviceInterfaceDetail to get
my instance
i even get it in the Registry in Control\DeviceClasses .
My IOCTL handler gives me few IOCTLS while recording.
but when i call createfile on it fails
Device_Handle = CreateFileW(Device_Name, GENERIC_READ,
0,NULL, OPEN_EXISTING,0,NULL);
if(Device_Handle == INVALID_HANDLE_VALUE){
printf("Error Occured while Opening Device GetLastError Code
%d\n",GetLastError());
Error_Code = 1;
}
i get err code 2 , means file not found, However, i can see the symbolic
link using winobj in the Global Directory.
So what's WRONG !!!!
Sorry for the BIG POST..
But can somebody tell what's wrong with my approach.I am just not able to
figure it out.Hope somebody from MS will clearify what's required to get it
working.
It would be better gives a code snippet.
Waiting for your help.
Thanks.
Regards,
Vipin
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