void CUsbHidDemoDlg::OnSend()
{
   char send_buf[1024];
   char recv_buf[1024;
   char seps[]   = " ,\t\n";
   char *token;
   int  status;
   int  i, idx = 0;
   CString str;

   int n;
   unsigned long size, myidx = 0, k;
   unsigned char *buf;
   size_t bsize = (sizeof(unsigned char) * myidx) + 1;
   FILE *f = fopen("hex.txt", "r");
   if(!f) exit(10);

   myidx = 0;
   while(!feof(f)) { fscanf(f, "%02x ", &n); myidx++; }
   fseek(f, 0, SEEK_SET);

   buf = (unsigned char *) malloc(bsize);
   memset(buf, 0, bsize);

   myidx = 1;
   buf[0] = (unsigned char) m_csOutputReportID.GetBuffer(0)[0]; /* report id */
   while(!feof(f)) {
    fscanf(f, "%02x ", &n);
    buf[myidx++] = (unsigned char) n;
   }

   printf("idx: %d\n", myidx);

   for(k = 0; k < bsize; k += mdevices.m_WriteSize)
   {
     if(mdevices.Write(buf+k) == 0) {
       printf("write #%d failed\n", k);
       free(buf); fclose(f);
       exit(5);
       m_csStatus += "Write Failed:  ";

       LPVOID lpMsgBuf;

       FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER |
           FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,    NULL,
           GetLastError(),
           MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
           (LPTSTR) &lpMsgBuf,    0,    NULL ); // Process any inserts in lpMsgBuf.

       m_csStatus += (LPCTSTR)lpMsgBuf;
       m_csStatus += "\r\n";


       // Free the buffer.
       LocalFree( lpMsgBuf );

       UpdateData(FALSE);
       return;
     }
     else
       printf("write #%d succeeded\n", k);

     memset(send_buf, 0, sizeof(send_buf));
     Sleep(100);

     status = mdevices.Read(recv_buf);
     if(status != 0) exit(6);
     if (status == 0)
     {
         m_csStatus += "Read Failed:  ";

         LPVOID lpMsgBuf;

         FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER |
             FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,    NULL,
             GetLastError(),
             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
             (LPTSTR) &lpMsgBuf,    0,    NULL ); // Process any inserts in lpMsgBuf.

         m_csStatus += (LPCTSTR)lpMsgBuf;
         m_csStatus += "\r\n";

         // Free the buffer.
         LocalFree( lpMsgBuf );

         UpdateData(FALSE);

         return;
     }
   else
   {
       m_csReadBuffer.Empty();

       // The first byte is the report ID
       str.Format("%02x", (unsigned char)recv_buf[0]);
       m_csInputReportID = str;

       // Extract and display the byte(s)
       for (i=1; i<status; ++i)
       {
          str.Format("%02x  ", (unsigned char)recv_buf[i]);
          m_csReadBuffer += str;
       }

       m_csStatus += "Read completed successfully!\r\n";
   }


   }

   printf("everything succeeded\n");

   free(buf);
   fclose(f);

   UpdateData(TRUE);

   m_csStatus.Empty();
   UpdateData(FALSE);
   UpdateWindow();

   UpdateData(FALSE);
}