TDI编程,遇到不能解决的问题了,bytessent 返回的值始终为0

TDI编程,遇到不能解决的问题了,bytessent 返回的值始终为0
我写的TDI程序,下面是接收例程,pBytesSent为指向返回的发送的字节数,
我调用这个例程
status = KsSend( pksocket,"senddata",sizeof( "senddata" ),&bytessent );
不知道为什么,bytessent 返回的值始终为0

请高手指点
NTSTATUS KsSend(IN PKSOCKET pKsocket,
                IN PVOID  SendData,
                IN ULONG DataLen,
                IN UINT *pBytesSent)
{
 KEVENT        SendEvent;
 PIRP        pIrp;
 PMDL        pMdl;
 NTSTATUS   status;
 char *     pSendBuffer;

 IO_STATUS_BLOCK             IoStatus = {0};
 
 KeInitializeEvent( &SendEvent, NotificationEvent, FALSE );

 pSendBuffer = ExAllocatePool( NonPagedPool, DataLen );

 memcpy( pSendBuffer, SendData, DataLen );

 // build an IRP to connect to a remote host
 pIrp = TdiBuildInternalDeviceControlIrp(        
                                        TDI_SEND,
                                        pKsocket -> pTcpDevObj,   // TDI driver's device object.
                                        pKsocket -> pConnFileObj, // Connection (endpoint) file object.
                                        &SendEvent,       // Event to be signalled when Irp completes.
                                        &IoStatus     // I/O status block.
                                       );
 if( NULL == pIrp )
 {
    DbgPrint( "Could not get an IRP for TDI_SEND" );
    if( pSendBuffer )ExFreePool( pSendBuffer );
    return( STATUS_INSUFFICIENT_RESOURCES );
 }

  // must run at <= DISPATCH_LEVEL
 ASSERT( KeGetCurrentIrql() <= DISPATCH_LEVEL );
 pMdl = IoAllocateMdl( pSendBuffer, DataLen, FALSE, FALSE, pIrp );

 if( pMdl ==NULL )
 {
    DbgPrint( "Could not get an MDL for TDI_SEND" );
    if( pSendBuffer )ExFreePool( pSendBuffer );
    return( STATUS_INSUFFICIENT_RESOURCES );
 }

 // must run at < DISPATCH_LEVEL for pageable memory
 ASSERT( KeGetCurrentIrql() < DISPATCH_LEVEL );
 __try
 {
  MmProbeAndLockPages(  pMdl,                     // (Try to) fix buffer.
                        KernelMode,
                        IoModifyAccess
                        );
 }
 __except(EXCEPTION_EXECUTE_HANDLER)
 {
    DbgPrint( "Exception calling MmProbeAndLockPages" );
    if( pSendBuffer )ExFreePool( pSendBuffer );
    return ( STATUS_INSUFFICIENT_RESOURCES );
 }

 TdiBuildSend(      pIrp,
                  pKsocket -> pTcpDevObj,                         // TDI driver's device object.
                  pKsocket -> pConnectFileObj,                       // Connection (endpoint) file object.
                  NULL,                               // I/O completion routine.
                  NULL,                               // Context for I/O completion routine.
                  pMdl,                               // MDL address.
                  0,                                  // Flags.  0 => send as normal TSDU.
                  DataLen                      // Length of buffer mapped by MDL.
                 );

  // set our own completion routine
  // must run at PASSIVE_LEVEL
  ASSERT( KeGetCurrentIrql() == PASSIVE_LEVEL );

  IoSetCompletionRoutine( pIrp, TDICompletionRoutine, &SendEvent, TRUE, TRUE, TRUE);

  //make the call
  // must run at <= DISPATCH_LEVEL
  ASSERT( KeGetCurrentIrql() <= DISPATCH_LEVEL );

 // Send the command to the underlying TDI driver
 status = IoCallDriver( pKsocket -> pTcpDevObj, pIrp );

 // wait on the IRP, if required...
 if ( STATUS_PENDING == status )
 {
    DbgPrint( "Waiting on IRP (send)..." );
    status = KeWaitForSingleObject( &SendEvent, Executive, KernelMode, FALSE, 0 );
 

     if (  STATUS_TIMEOUT == status  )
     {
        //something is wrong
        DbgPrint( "STATUS_TIMEOUT (send), status 0x%08X", status );
        
     }

     if (  STATUS_SUCCESS != IoStatus.Status  )
     {
        //something is wrong
        DbgPrint( "Completion of IRP failed (send), status 0x%08X", IoStatus.Status );
    
     }
 }
 *pBytesSent = ( UINT )IoStatus.Information;
 status = IoStatus.Status;
 if(pMdl)
 {
    MmUnlockPages(pMdl);
    IoFreeMdl(pMdl);
 }
 return status;


}

解决了,*pBytesSent = ( UINT ) pIRP -> IoStatus.Information;