From: Eric W Hanson [ehanson@microsoft.com]
Sent: Tuesday, March 19, 2002 2:50 PM
To: NT Developers Interest List
Subject: [ntdev] Re: tdi SetEventHandler

Your code is missing a couple of things.  One is a call to
TdiBuildReceiveDatagram the other is a call to SetNextIrpStackLocation.


1) set *BytesTaken = 0
2) Allocate an IRP
3) Pass the IRP to the TdiBuildReceiveDatagram() macro
4) Call SetNextIrpStackLocation() on the IRP.
5) Assign the IRP to *IoRequestPacket
6) return STATUS_MORE_PROCESSING_REQUIRED


Some pseudo code would look like:

PIRP irp;
irp=IoAllocateIrp(...,False);
TdiBuildReceiveDatagram(...);  //  Set the completion routine for the
IRP here.
SetNextIrpStackLocation(irp);  //  Necessary to advance the stack
pointer.
*IoRequestPacket=irp;
*BytesTaken=0;
return STATUS_MORE_PROCESSING_REQUIRED;

Below is a sample completion routine for the above pseudo code.  

NTSTATUS
IoCompletionAsync(PDEVICE_OBJECT DeviceObject, PIRP Irp, PVOID Context)
{
    IoFreeIrp(Irp);
    return STATUS_MORE_PROCESSING_REQUIRED;
}

Now the only thing missing would be a buffer to receive the data into.
If your TDI Client allocates the buffer then it will be responsible for
either freeing the buffer or reusing the buffer.  This would be done in
the completion routine before calling IoFreeIrp().

For the case where BytesIndicated == BytesAvailable you can still do
steps 1-6 above or you can do the following steps:

1) Copy the data at Tsdu for the BytesIndicated
2) Set *BytesTaken = BytesAvailable
3) return STATUS_SUCCESS
   
- Eric

This posting is provided "AS IS" with no warranties, and confers no
rights.


-----Original Message-----
From: sampo [mailto:jd1970@voila.fr] 
Sent: Tuesday, March 19, 2002 9:15 AM
To: NT Developers Interest List
Subject: [ntdev] Re: tdi SetEventHandler


I try this but windows crash.
Have you an example ?
 Thanks for your help.

This is my code :

///////////
///  Install Event Handler (Work Fine)

	
pIrp=TdiBuildInternalDeviceControlIrp(TDI_RECEIVE_DATAGRAM,pDeviceObject
,pTdiTransportObject,NULL,NULL);
	if(pIrp==NULL)
		dStatus=STATUS_INSUFFICIENT_RESOURCES;
	else
	{
	
TdiBuildSetEventHandler(pIrp,pDeviceObject,pTdiTransportObject,NULL,NULL
,TDI_EVENT_RECEIVE_DATAGRAM,RcvDatagram,NULL);
		dStatus=TdiCall(pIrp,pDeviceObject,&IoStatusBlock);
	}

///////////////////
// Event Handler (crash)

NTSTATUS RcvDatagram(IN PVOID TdiEventContext,IN LONG
SourceAddressLength,IN PVOID SourceAddress,IN LONG OptionsLength,
					 IN PVOID Options,IN ULONG
ReceiveDatagramFlags,IN ULONG BytesIndicated,IN ULONG BytesAvailable,
					 OUT ULONG *BytesTaken,IN PVOID
Tsdu,OUT PIRP *IoRequestPacket) {

static int BytesRcv=0;

	BytesRcv+=BytesIndicated;
	DbgPrint("BytesIndicated=%lu\n\r",BytesIndicated);
	DbgPrint("BytesAvailable=%lu\n\r",BytesAvailable);

if(BytesRcv<10000)
{
//PIRP Test (global)
	
Test=TdiBuildInternalDeviceControlIrp(TDI_RECEIVE_DATAGRAM,IoGetRelatedD
eviceObject(pTdiTransportObject),
	
pTdiTransportObject,NULL,NULL);
	if(Test==NULL)
	{
		DbgPrint("ERROR IoRequestPacket\n\r");
		return STATUS_DATA_NOT_ACCEPTED;
	}
	else
	{
		IoRequestPacket=&Test;
		*BytesTaken=BytesIndicated;
		return STATUS_MORE_PROCESSING_REQUIRED;
	}
}
else
   return STATUS_SUCCESS;



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