两个Bulk in Endpoint，在Read函数中怎样区分？－－－ＤＳ

NTSTATUS UCANDevice::Read(KIrp I)
{
t << "Entering UCANDevice::Read, " << I << EOL;
// TODO: Check the incoming request. Replace "FALSE" in the following
// line with a check that returns TRUE if the request is not valid.

if (FALSE) // If (Request is invalid)
{
// Invalid parameter in the Read request
I.Information() = 0;
return I.PnpComplete(this, STATUS_INVALID_PARAMETER);
}

// Always ok to read 0 elements.
if (I.ReadSize() == 0)
{
I.Information() = 0;
return I.PnpComplete(this, STATUS_SUCCESS);
}

// Declare a memory object
KMemory Mem(I.Mdl());

ULONG dwTotalSize = I.ReadSize(CURRENT);
ULONG dwMaxSize = m_Endpoint1IN.MaximumTransferSize();

// If the total requested read size is greater than the Maximum Transfer
// Size for the Pipe, request to read only the Maximum Transfer Size since
// the bus driver will fail an URB with a TransferBufferLength of greater
// than the Maximum Transfer Size.
if (dwTotalSize > dwMaxSize)
{
ASSERT(dwMaxSize);
dwTotalSize = dwMaxSize;
}

// Allocate a new context structure for Irp completion
USB_COMPLETION_INFO* pCompInfo = new (NonPagedPool) USB_COMPLETION_INFO;
if (pCompInfo == NULL)
{
I.Information() = 0;
return I.PnpComplete(this, STATUS_INSUFFICIENT_RESOURCES);
}

// TODO: Select the correct pipe to read from

// Create an URB to do actual Bulk read from the pipe
PURB pUrb = m_Endpoint1IN.BuildBulkTransfer(
Mem, // Where is data coming from?
dwTotalSize, // How much data to read?
TRUE, // direction (TRUE = IN)
NULL, // Link to next URB
TRUE // Allow a short transfer
);

if (pUrb == NULL)
{
delete pCompInfo;
I.Information() = 0;
return I.PnpComplete(this, STATUS_INSUFFICIENT_RESOURCES);
}

// Initialize context structure
pCompInfo->m_pClass = this;
pCompInfo->m_pUrb = pUrb;

// Submit the URB to our USB device
NTSTATUS status;
status = m_Endpoint1IN.SubmitUrb(I, pUrb, LinkTo(ReadComplete), pCompInfo, 0);
return status;
}

////////////////////////////////////////////////////////////////////////
// UCANDevice::ReadComplete
//
// Routine Description:
// Completion Handler for IRP_MJ_READ
//
// Parameters:
// I - IRP just completed by USB
// pContext - Context structure containing pointer to Urb
//
// Parameters:
// NTSTATUS - STATUS_SUCCESS
//
// Comments:
// This routine is called when USBD completes the read request
//

NTSTATUS UCANDevice::ReadComplete(KIrp I, USB_COMPLETION_INFO* pContext)
{
// Normal completion routine code to propagate pending flag

if (I->PendingReturned)
{
I.MarkPending();
}

NTSTATUS status = I.Status();
PURB pUrb = pContext->m_pUrb;
ULONG nBytesRead = 0;

if ( NT_SUCCESS(status) )
{
nBytesRead = pUrb->UrbBulkOrInterruptTransfer.TransferBufferLength;
if (nBytesRead > 0)
t << "Read() got " << nBytesRead<< " bytes from USB\n";
}

// Deallocate Urb and context structure
delete pUrb;
delete pContext;

// set returned count
I.Information() = nBytesRead;

// Plug and Play accounting
DecrementOutstandingRequestCount();

// allow IRP completion processing
return STATUS_SUCCESS;
}

// BULK Pipe for USB endpoint 1 IN (address 0x81)
KUsbPipe m_Endpoint1IN;
// BULK Pipe for USB endpoint 2 OUT (address 0x2)
KUsbPipe m_Endpoint2OUT;
// BULK Pipe for USB endpoint 3 IN (address 0x83)
KUsbPipe m_Endpoint3IN;

用DS2.7生成了代码，可以对Endpoint1以Bulk方式读，Endpoint2以Bulk方式写，Endpoint3也是Bulk方式的IN端口，怎样在NTSTATUS UCANDevice::Read(KIrp I){}函数中 加入读Endpoint3代码，用来区分是对Endpoint1 ，还是Endpoint3的读操作呢？

设置活动端点就可以了!或者多增加几个这样的函数就可以了!

自己顶一下.

难了好几天的问题,怎么区分呢?