Solved

gina

Posted on 2000-03-18
7
186 Views
Last Modified: 2013-12-03
I'm developing a security system using smart cards. I'm also trying  to use these cards to login to Windows NT, so I'm creating a custom GINA library.

I'm working with the original msgina.dll but I have a problem when reading the characters from the smart card because these are stored in ASCII code and GINA is expecting an unsigned short.

I was wondering if you could help me solve this problem. Thank you.

Thiel Fischer
thiel@telcom.net
0
Comment
Question by:thiel
  • 4
  • 3
7 Comments
 
LVL 32

Accepted Solution

by:
jhance earned 30 total points
ID: 2632229
thiel,

All of the GINA functions use UNICODE and not ASCII.  wchar_t is defined as:

#define wchar_t unsigned short

Since a GINA library is NT only, you probably just want to set UNICODE as the default in your project build options.  Otherwise, make sure you are using wchar_t and doing the proper conversions to/from char wherever required.
0
 

Author Comment

by:thiel
ID: 2632379
How I make the convertions from a char[16] to a wchar_t
0
 
LVL 32

Expert Comment

by:jhance
ID: 2633032
Before I do that, please tell me why you need to do it.  If you choose to build this applications as a pure UNICODE project, there should be no need for this.

In an MFC or ATL app, you can include afxpriv.h which include a whole set of character conversion macros.  The A2W macro will convert from char to wchar_t.

Otherwise, there is the MultiByteToWideChar function.
0
Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

 

Author Comment

by:thiel
ID: 2633741
I'm using char types beacuse it is what I receive from the reader and also the Gina project is already builded.

I tried the following

WideCharToMultiByte(CP_ACP,0,pMini->pszUsername,-1,cadena,sizeof(cadena),NULL,NULL);

But when Gina runs returns the following error:

Initialization of the dynamic link library c:\winnt\system32\inetmib1.dll failed. The process is terminatig abnormally.

Then the Winlogon aplication ends and the system automaticaly reboot the machine.
0
 

Author Comment

by:thiel
ID: 2633771
Also I tried to use the following convertions


AsciiToUnicode(pMini->pszUsername,cadena);


void
AsciiToUnicode(PWCHAR dst, char *src)
{
  while (*src)
    *dst++ = (WCHAR)*src++;
  *dst = 0;
}

cadena is a char[16] variable

but the winlogon return the following error:

The Instruction at "0x10001a43" referenced memory at "0x007300069". The memory could not be "written".

0
 
LVL 32

Expert Comment

by:jhance
ID: 2633810
Initialization of the dynamic link library c:\winnt\system32\inetmib1.dll failed

This has nothing that I can think of to do with MultiByteToWideChar().

You have:

WideCharToMultiByte(CP_ACP,0,pMini->pszUsername,-1,cadena,sizeof(cadena),NULL,NULL);

the DESTINATION of the conversion operation is NULL.  That's not good...

You also have 8 arguments to this function, I only count 6:

int MultiByteToWideChar(
  UINT CodePage,         // code page
  DWORD dwFlags,         // character-type options
  LPCSTR lpMultiByteStr, // string to map
  int cbMultiByte,       // number of bytes in string
  LPWSTR lpWideCharStr,  // wide-character buffer
  int cchWideChar        // size of buffer
);


Here is a sample that I put together using this function as well as a manual way similar to what you've done:


#include "stdafx.h"
#include "Ansi2Unicode.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

CWinApp theApp;

using namespace std;

BOOL AnsiToUnicode(wchar_t *dst, char *src)
{
      if(dst == NULL || src == NULL){
            return FALSE;
      }

      memset(dst, 0, (strlen(src)+1) * 2);

      while(*src){
            *dst = (wchar_t)*src;
            dst++;
            src++;
      }

      return TRUE;
}

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{

      // The string to convert
      char *lpszSource = "This is only a test";

      // Destination for MultiByteToWideChar
      wchar_t *wszDest1 = new wchar_t[(strlen(lpszSource)+1) * 2];

      // Destination for AnsiToUnicode function
      wchar_t *wszDest2 = new wchar_t[(strlen(lpszSource)+1) * 2];

      // Have Windows convert it.
      MultiByteToWideChar(CP_ACP, 0, lpszSource, -1, wszDest1, (strlen(lpszSource)+1) * 2);

      // Do it the hard way.
      if(AnsiToUnicode(wszDest2, lpszSource)){
            cerr << "OK" << endl;
      }
      else{
            cerr << "Error" << endl;
      }

      // See if they are the same
      if(wcscmp(wszDest1, wszDest2) == 0){
            cerr << "Same" << endl;
      }
      else{
            cerr << "Different" << endl;
      }

      delete [] wszDest1;
      delete [] wszDest2;


      return 0;
}
0
 
LVL 32

Expert Comment

by:jhance
ID: 2633814
Oops!  I'm sorry, you're using WideCharToMultiByte.  This converts a UNICODE to ASCII.

You want to call MultiByteToWideChar.

That is what I said, isn't it????

Yes, I said:

>>Otherwise, there is the MultiByteToWideChar function.
0

Featured Post

What Should I Do With This Threat Intelligence?

Are you wondering if you actually need threat intelligence? The answer is yes. We explain the basics for creating useful threat intelligence.

Join & Write a Comment

zlib is a free compression library (a DLL) on which the popular gzip utility is built.  In this article, we'll see how to use the zlib functions to compress and decompress data in memory; that is, without needing to use a temporary file.  We'll be c…
This article surveys and compares options for encoding and decoding base64 data.  It includes source code in C++ as well as examples of how to use standard Windows API functions for these tasks. We'll look at the algorithms — how encoding and decodi…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
This video shows how to remove a single email address from the Outlook 2010 Auto Suggestion memory. NOTE: For Outlook 2016 and 2013 perform the exact same steps. Open a new email: Click the New email button in Outlook. Start typing the address: …

708 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now