如何理解kirp::ioctlbuffer???

kirp::ioctlbuffer返回指向接受或写向设备的数据的指针。在主机应用程序的DeviceIoControl(
  HANDLE hDevice,              // handle to device of interest
  DWORD dwIoControlCode,       // control code of operation to perform
  LPVOID lpInBuffer,           // pointer to buffer to  supply input data
  DWORD nInBufferSize,         // size, in bytes, of input buffer
  LPVOID lpOutBuffer,          // pointer to buffer to receive output data
  DWORD nOutBufferSize,        // size, in bytes, of output buffer
  LPDWORD lpBytesReturned,     // pointer to variable to receive byte count
  LPOVERLAPPED lpOverlapped    // pointer to structure for asynchronous operation
);
ioctlbuffer是指向lpInBuffer还是指向lpOutBuffer还是其他？？
谢谢


  :( :( :( :(

到了驱动的BuildVendorRequest其第一个参数为传输缓冲区，给它赋
上面两个缓冲区的哪一个？？