DeviceIoControl的问题！

DeviceIoControl
{
HANDLE hDevice, // 设备句柄
DWORD dwIoControlCode, // I/O请求码            
LPVOID lpInBuffer, // 输入数据缓冲区          <A>              
DWORD nInBufferSize, // 输入数据缓冲区长度    <B>
LPVOID lpOutBuffer, // 输出数据缓冲区         <C>
DWORD nOutBufferSize, // 输出数据缓冲区长度   <D>
LPDWORD lpBytesReturned, // 实际读到的数据量  <E>
LPOVERLAPPED lpOverlapped // 重叠方式
}

驱动中分别指定了METHOD_BUFFERED(缓冲I/O)和METHOD_IN/OUT_DIRECT(直接I/O)方式时，参数ABCDE到底是怎么和DS做的驱动联系上的呀！

在看EzUsb的驱动代码时，看到在NTSTATUS EzUsbDevice::DeviceControl(KIrp I)中有两个用户自定义请求，一个是复位端口，一个是复位管道
case IOCTL_EZUSB_RESET:
{
t << \"IOCTL_EZUSB_RESET \\n\";

ULONG_PTR nInfo = NULL;

status = m_Lower.DeviceIoControl(
IOCTL_INTERNAL_USB_RESET_PORT,
NULL,
0,
NULL,
0,
TRUE,
&nInfo
);

break;
}

/////////////////////////////////////////////////////////////

case IOCTL_EZUSB_RESETPIPE:
{
t << \"IOCTL_EZUSB_RESETPIPE \\n\";

ULONG dwPipeNum = *( reinterpret_cast<PULONG>(pBuffer) );

KUsbPipe* pipe = FindPipe(dwPipeNum);

if(NULL == pipe)
{
status = STATUS_INVALID_PARAMETER;
}
else
{
status = pipe->Reset();
}

break;
}

这两个请求有什么区别吗？

DeviceIoControl
{
HANDLE hDevice, // 设备句柄
DWORD dwIoControlCode, // I/O请求码            
LPVOID lpInBuffer, // 输入数据缓冲区          <A>              
DWORD nInBufferSize, // 输入数据缓冲区长度    <B>
LPVOID lpOutBuffer, // 输出数据缓冲区         <C>
DWORD nOutBufferSize, // 输出数据缓冲区长度   <D>
LPDWORD lpBytesReturned, // 实际读到的数据量  <E>
LPOVERLAPPED lpOverlapped // 重叠方式
}

驱动中分别指定了METHOD_BUFFERED(缓冲I/O)和METHOD_IN/OUT_DIRECT(直接I/O)方式时，参数ABCDE到底是怎么和DS做的驱动联系上的呀！

KIrp::IoctlBuffer
PVOID& IoctlBuffer( void );

Accessor to the buffer for a buffered DeviceIoControl operation.

Returns
Returns a reference to field AssociatedIrp.SystemBuffer.


KIrp::IoctlOutputBufferSize
ULONG& IoctlOutputBufferSize( EStackLocation s );

Returns the size of the output buffer for an IRP whose major function is IRP_MJ_DEVICECONTROL.

Parameters
 s
Either CURRENT or NEXT. The default value is CURRENT.

KIrp::IoctlInputBufferSize
ULONG& IoctlInputBufferSize( EStackLocation s );

Returns the size of the input buffer for an IRP whose major function is IRP_MJ_DEVICECONTROL.

Parameters
 s
Either CURRENT or NEXT. The default value is CURRENT.


KIrp::Information
ULONG& Information( void );

Accessor to the information field.

Returns
Returns a reference to IRP field IoStatus.Information.


不看书的人。

KIrp::IoctlBuffer
PVOID& IoctlBuffer( void );

Accessor to the buffer for a buffered DeviceIoControl operation.

Returns
Returns a reference to field AssociatedIrp.SystemBuffer.


KIrp::IoctlOutputBufferSize
ULONG& IoctlOutputBufferSize( EStackLocation s );

Returns the size of the output buffer for an IRP whose major function is IRP_MJ_DEVICECONTROL.

Parameters
 s
Either CURRENT or NEXT. The default value is CURRENT.

KIrp::IoctlInputBufferSize
ULONG& IoctlInputBufferSize( EStackLocation s );

Returns the size of the input buffer for an IRP whose major function is IRP_MJ_DEVICECONTROL.

Parameters
 s
Either CURRENT or NEXT. The default value is CURRENT.


KIrp::Information
ULONG& Information( void );

Accessor to the information field.

Returns
Returns a reference to IRP field IoStatus.Information.


不看书的人。

呵呵，接受大虾的批评！偶看ing... :D