c++ - DeviceIoControl for SCSI INQUIRY command returns error 50 -

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i trying access usb scanner through ioctl commands. on windows 7. did not deal ioctl coding before, first tried following snippet based on find quick search.

#include "stdafx.h" #include <stddef.h> #include <windows.h> #include <ntddscsi.h> #include <usbscan.h>  typedef struct {     scsi_pass_through spt;     byte sense[18];     byte data[36]; } sptsd;  lptstr errormessage(dword error) {     lptstr errortext = null;      formatmessage(        format_message_from_system        |format_message_allocate_buffer        |format_message_ignore_inserts,          null,        error,        makelangid(lang_neutral, sublang_default),        (lptstr)&errortext,        0,         null);      return errortext; }  int _tmain(int argc, _tchar* argv[]) {     handle h = createfile(l"\\\\.\\usbscan0", generic_read|generic_write, file_share_read|file_share_write, null, open_existing, file_attribute_normal, null);      if (invalid_handle_value != h)     {         sptsd sptsd={0};         sptsd.spt.length = sizeof (sptsd.spt);         sptsd.spt.senseinfolength = sizeof(sptsd.sense);         sptsd.spt.datatransferlength = sizeof(sptsd.data);         sptsd.spt.senseinfooffset = offsetof (sptsd, sense);         sptsd.spt.databufferoffset = offsetof (sptsd, data);         sptsd.spt.timeoutvalue = 30;         sptsd.spt.datain = scsi_ioctl_data_in;         sptsd.spt.cdblength = 6;         sptsd.spt.cdb[0] = 0x12; // scsi inquiry command         sptsd.spt.cdb[1] = 0;         sptsd.spt.cdb[2] = 0;         sptsd.spt.cdb[3] = 0;         sptsd.spt.cdb[4] = sizeof(sptsd.data);         sptsd.spt.cdb[5] = 0;          dword dwreturnedbytes;         bool b;          b = deviceiocontrol(h, ioctl_scsi_pass_through, &sptsd, sizeof(sptsd), &sptsd, sizeof(sptsd), &dwreturnedbytes, null);          if (b == 0)         {             lptstr errortext = errormessage(getlasterror());             wprintf(l"deviceiocontrol(ioctl_scsi_pass_through-inquiry) failed error %d : %s\r\n", getlasterror(), errortext);             localfree(errortext);         }         else         {             wprintf(l"deviceiocontrol(ioctl_scsi_pass_through-inquiry) succeeded\r\n");             (int i=0; i<dwreturnedbytes; i++)             {                 wprintf(l"%02x ", sptsd.data[i]);             }              wprintf(l"\r\nend of returned data\r\n");         }          device_descriptor dd;         b = deviceiocontrol(h, ioctl_get_device_descriptor, &dd, sizeof(dd), &dd, sizeof(dd), &dwreturnedbytes, null);          if (b == 0)         {             lptstr errortext = errormessage(getlasterror());             wprintf(l"deviceiocontrol(ioctl_get_device_descriptor) failed error %d : %s\r\n", getlasterror(), errortext);             localfree(errortext);         }         else         {             wprintf(l"deviceiocontrol(ioctl_get_device_descriptor) succeeded\r\n");             wprintf(l"vendorid = %x, productid = %x, version = %x\r\n", dd.usvendorid, dd.usproductid, dd.usbcddevice);             wprintf(l"end of returned data\r\n");         }          closehandle(h);     }      return 0; }

i tried both 32-bit , 64-bit versions of windows 7 result same on both (error 50 : request not supported.). interestingly, second deviceiocontrol call works , returns vid/pid of device, along firmware version.

based on error message, think ioctl not supported. however, looked , found out ioctl code mandatory devices, there must doing wrong. how should code modified inquiry command succeed?

according http://msdn.microsoft.com/en-us/library/ff548569%28v=vs.85%29.aspx, these ioctl codes recognized kernel-mode still image driver usb buses.

  • ioctl_cancel_io
  • ioctl_get_channel_align_rqst
  • ioctl_get_device_descriptor
  • ioctl_get_pipe_configuration
  • ioctl_get_usb_descriptor
  • ioctl_get_version
  • ioctl_read_registers
  • ioctl_reset_pipe
  • ioctl_send_usb_request
  • ioctl_set_timeout
  • ioctl_wait_on_device_event ioctl_write_registers

my understanding other ioctl code should sent via ioctl_send_usb_request control code. explains why trying send inqury command using above code not work.

edit: matter of using writefile send inquiry command , readfile read response. however, there seems additional issue not understand: device wants byte after 6 bytes of inquiry command send response. otherwise, readfile return single byte (0x3). update reply again if figure out happening here.


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