status返回值为0x00000103为什么意思？

status = m_Endpoint1IN.SubmitUrb(I, pUrb, LinkTo(ReadComplete), pCompInfo, 0);
    t << "Read: status=" << ULONG(status) << "\n";

程序运行到这里返回值为0x00000103，然后就打住了，不再往下运行。请问怎么回事啊？

知道了0x00000103是STATUS_PENDING
可是下来该怎么办呢？我又迷惑了。m_Interface.Initialize(
m_Lower, //KUsbLowerDevice
0, //InterfaceNumber
1, //ConfigurationValue
0 //Initial Interface Alternate Setting
);

// Initialize each Pipe object
status=m_Endpoint1IN.Initialize(m_Lower, 0x87, 64);
if ( NT_SUCCESS(status) )
t << "Open pipe Endpoint1IN Succeed: status=" << ULONG(status) << "\n";

status=m_Endpoint1OUT.Initialize(m_Lower, 0x08, 64);
if ( NT_SUCCESS(status) )
t << "Open pipe Endpoint1OUT Succeed: status=" << ULONG(status) << "\n";
这两处返回都是succeed，但是startdevice里面又报AC_FAILED_TO_OPEN_PIPE_OBJECT。