怎样异步调用USB的DeviceIoControl输入?

CreateFile以异步方式建立。
有输入数据的话，就可以读出。但没有的话就停下来一直等，其它的通讯则无法完成。通过查看驱动输出的信息，在SubmitUrb（）后的t << "Submit Over\n";已经出现，说明已经执行了return STATUS_PENDING;但我的应用程序还在等待，不知为何。

应用程序：
BOOL CUDK_XP_DEVICE::Endpoint1ListenPipes(UINT Length, void *pBuffer)
{
ULONG nOutput; // Count written to bufOutput

// Call device IO Control interface (THERMOMETER_READ_DATA) in driver
if (!DeviceIoControl(hDevice,
D12_DRIVER_READ,
pBuffer,
Length,
pBuffer,
Length,
&nOutput,
NULL)
  )
{
AfxMessageBox("ERROR: DeviceIoControl returns %d \n", GetLastError());
return 0;
}

TRACE("The DRIVER_READ counter is %d .\n", nOutput);

return 1;
}

驱动程序：
NTSTATUS D12_DriverDevice::D12_DRIVER_READ_Handler(KIrp I)
{
NTSTATUS status = STATUS_SUCCESS;

t << "Entering D12_DriverDevice::D12_DRIVER_READ_Handler, " << I << EOL;
// TODO: Verify that the input parameters are correct
// If not, return STATUS_INVALID_PARAMETER

// TODO: Handle the the D12_DRIVER_READ request, or
// defer the processing of the IRP (i.e. by queuing) and set
// status to STATUS_PENDING.

// TODO: Assuming that the request was handled here. Set I.Information
// to indicate how much data to copy back to the user.
I.Information() = 0;

m_pUrb1In = m_Endpoint1In.BuildInterruptTransfer(
(unsigned char *)I.IoctlBuffer(), // transfer buffer
I.IoctlInputBufferSize(), // transfer buffer size
TRUE, // Short Ok
NULL, // link urb
m_pUrb1In // new urb
);

if ( m_pUrb1In == NULL )
{
return STATUS_INSUFFICIENT_RESOURCES;;
}

PVOID CI = InterlockedCompareExchangePointer( (PVOID*)&CurrentIrp(), PVOID( PIRP(I)), NULL);

// Allow only one request at a time
if ( CI != NULL ) return STATUS_DEVICE_BUSY;

CancelSpinLock::Acquire();
if ( I.WasCanceled() )
{
CurrentIrp() = NULL;
CancelSpinLock::Release();
return STATUS_CANCELLED;
}

I.SetCancelRoutine( LinkTo(Cancel) );
CancelSpinLock::Release();
I.MarkPending();

t << "Submit URB\n";
// submit the URB to USBD
IncrementOutstandingRequestCount();
m_Endpoint1In.SubmitUrb(m_kIrp, m_pUrb1In, LinkTo(ReadCounterComplete),this);
t << "Submit Over\n";
return STATUS_PENDING;

}

NTSTATUS D12_DriverDevice::ReadCounterComplete(KIrp I)
{
t << "Read Completion routine\n";
KIrp Current( CurrentIrp() );
if ( Current == NULL )
{
DecrementOutstandingRequestCount();
return STATUS_MORE_PROCESSING_REQUIRED;
}
CancelSpinLock::Acquire();
if ( Current.WasCanceled() )
{
CancelSpinLock::Release();
DecrementOutstandingRequestCount();
return STATUS_MORE_PROCESSING_REQUIRED;
}
else
{
Current.SetCancelRoutine(NULL);
CancelSpinLock::Release();
CurrentIrp() = NULL;
}
if ( I.Status() != STATUS_SUCCESS )
{
NTSTATUS status = I.Status();
Current.PnpComplete(this, status);
DecrementOutstandingRequestCount();
return STATUS_MORE_PROCESSING_REQUIRED;
}
// find the buffer pointer in the URB
  PUCHAR buffer = (PUCHAR)m_pUrb1In->UrbBulkOrInterruptTransfer.TransferBuffer;

// Dump the buffer
t << "Urb data[0]: " << buffer[0] << "\n";
// Data from the IRP read is stored in the ioctl buffer associated with this
// IRP:
PUCHAR(Current.IoctlBuffer());
// IrpBuffer[0] = buffer[0];
Current.Information() = 1;
Current.PnpComplete(this, STATUS_SUCCESS);
DecrementOutstandingRequestCount();
return STATUS_MORE_PROCESSING_REQUIRED;
}

你的deviceiocontrol是以同步方式调用的，改为异步试试。

我也遇到了类似的问题，createfile和deviceiocontrol都改为了异步方式，但还是进入deviceiocontrol不返回，用softice跟了一下，调用deviceiocontrol的时候没有进入驱动的相应的handler。

各位大侠，这是什么原因呢？

应用程序deviceiocontrol的最后一参数改为了事件后，搞定。
shuzhibuaa可参考我的代码。
但我的输入与输出却不能同时调用，不知为何。

我的deviceiocontrol改为异步怎么不行呢？zhuge36，你其他地方改了吗（比如驱动程序里）？把你修改后的代码贴出来看看好吗？

可以参考《Windows 2000/xp WDM设备驱动程序开发》第五章。
驱动程序要做一定修改。

zhuge36:
我在应用程序这里碰到了一点问题，看了你们的贴子，做了一点改动，但是还是有问题，你能不能帮我看一看，在下面的地址：

http://www.driverdevelop.com/forum/html_60995.html?1077272424

多谢了。