dev-cpp-users Mailing List for Dev-C++

Learn about the Windows Message loops and in there you can use a switch - 
case statement. This is a little crude - DirectInput (part of the DirectX 
library) is used a lot these days.


>From: "Cyril Dupuit" <cyr...@ho...>
>To: dev...@li...
>Subject: [Dev-C++] Help me please !
>Date: Mon, 12 Jan 2004 18:15:45 +0100
>
>Hello,
>
>I developed a small "driver" for a game pad connected to LPT1 under DOS. 
>This driver functions very well and it appeared extremely interesting to me 
>to develop this driver under Windows, which will enable me to play with 
>different games. My question is as follows: " How will I be able to create 
>a driver for a game pad connected to LPT1 with Dev-C++? ".
>
>If you have addresses or, examples of codes, could you send me at : 
>cyr...@ho....
>
>Thank you. Cyril.
>
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Hello,

I developed a small "driver" for a game pad connected to LPT1 under DOS. 
This driver functions very well and it appeared extremely interesting to me 
to develop this driver under Windows, which will enable me to play with 
different games. My question is as follows: " How will I be able to create a 
driver for a game pad connected to LPT1 with Dev-C++? ".

If you have addresses or, examples of codes, could you send me at : 
cyr...@ho....

Thank you. Cyril.

_________________________________________________________________
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gratuitement avec vos amis !

On Jan 12, 2004, at 8:11 AM, Maya wrote:

> jme::NewAccountDlg::NewAccountDlg()(int w, int h, const char* t)
> : Fl_Double_Window( w, h, t ){
^^ this line creates a double window and keeps it active for the
    following widgets to be created until you call end
>   Fl_Window* window = new Fl_Window (10,10,300, 180);
^^ This line creates a subwindow in the above window
>    window->show ();
^^ This line show the window inside the double window. But unless
    you show the double window, nothing will appear in the screen
>    window->end ();
> }
>

So either you write this to create a window in a window
> jme::NewAccountDlg::NewAccountDlg()(int w, int h, const char* t)
> : Fl_Double_Window( w, h, t ){
>   Fl_Window* window = new Fl_Window (10,10,300, 180);
>    window->show ();
>    window->end ();
      end(); show();
> }
Or this to create two seperate windows
> jme::NewAccountDlg::NewAccountDlg()(int w, int h, const char* t)
> : Fl_Double_Window( w, h, t ){
     end(); show();
>   Fl_Window* window = new Fl_Window (10,10,300, 180);
>    window->show ();
>    window->end ();
> }
Or this to create one simple window:
> jme::NewAccountDlg::NewAccountDlg()(int w, int h, const char* t)
> : Fl_Double_Window( w, h, t ){
     end();
     show();
> }

I have been looking for in '..../doc/fltk-1.1.4/index.html/ for an 
example that might help me resolve this problem.
If all the GUI operations are within a class, how would the main.cpp 
look like. The code below does not work!!
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Box.H>
#include "NewAccountDlg.H"

int main (int argc, char *argv[])
{
   jme::NewAccountDlg nad(100,100, "Maya");

    return Fl::run();
}

---------------------
#ifndef NEW_ACCOUNT_DLG_H
#define NEW_ACCOUNT_DLG_H


#include <FL/Fl_Window.H>
#include <FL/Fl_Double_Window.H>

#include <string>
namespace jme{
   class NewAccountDlg : public Fl_Double_Window{
      private:
  
      public:
         NewAccountDlg((int, int, const char*));
         ~NewAccountDlg();
   }; //NewAccount
}
#endif
--------------------------------------------------
#ifndef NEW_ACCOUNT_DLG_H
   #include "NewAccountDlg.H"
#endif
jme::NewAccountDlg::NewAccountDlg()(int w, int h, const char* t)
: Fl_Double_Window( w, h, t ){
   Fl_Window* window = new Fl_Window (10,10,300, 180);
    window->show ();
    window->end ();
}
jme::NewAccountDlg::~NewAccountDlg(){}

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Hi David (and Reid),

I should be more careful with my wording; the "server" side is actually =
a
database server. This is really a database app. Now, I CAN install a
script/app on the primary or secondary server (there are several), but =
what
I really need to do is find some way to secure the database passwords
themselves.

I'm not sure of a good method for doing this, as the client has to have =
the
plaintext passwords to make the connections to the databases. I could
require the user to provide some sort of username and password, of =
course,
but part of the purpose of this program is data-warehousing, meaning =
moving
very large amounts of data between machines; so, I'd like to be able to =
run
it (the update/transfer portion, at least) in off-peak hours, =
automatically.


I'm kind of stuck: the client app has to know how to connect, somehow, =
but I
also need to run the app on off-peak hours, without user input.

So, this is really my question: is there any combination of algorithm =
and
key/salt data which would make it unreasonably difficult to discover the
database connection info, or is that a pipe dream? If not, would =
installing
the update portion as a (automatic/scheduled) server application and the
data mining part on client machines (requiring a username and password =
to
logon) be acceptably secure? What are the pros and cons of this idea?

I should also mention that one of the database systems I have to work =
with
is an old Visual FoxPro system - no, changing that part is not an option =
-
and working with it requires that the clients be on the same LAN as the
server holding the Visual FoxPro files, since FoxPro is not really a =
server.
This LAN is not accessible from outside; security on this project is =
already
a nightmare.

Anyone still reading?

-Ed

=20


-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of David =
McKen
Sent: Sunday, January 11, 2004 9:35 PM
To: Dev-C Mailing List
Subject: Re: [Dev-C++] Simple encryption/obfuscation


By definition of your problem anyone who know your algorithm is going
to be able to decrypt the file. Essentially a hacker has all the info
they need if they get their hands on the algorithm and the file that
has both the e-mail and the encrypted data.=20

Including a bit of randomness is not going to be easy to do as you
have to somehow rember that random value for you to decrypt it every
time.=20

Possibly hide the encrypted data in a file with some other data. And
maybe store the e-mail seperate from the encrypted data. Make it
harder for a hacker to get the data they want, this assumes that a
potential hacker already knows the algorithm.

Hope This Helps
David McKen

--- Ed Cottrell <em...@to...> wrote:
> Hello all,
>=20
> I need help on an algorithm. I need to accept username/password
> combinations
> on the client side of a client-server app, store those on the
> client side,
> and "decrypt" them again without user input, using only the stored
> strings.
> Think the "remember my password" function in MS Outlook, IE, etc.
>=20
> Ideally, I would like to do this:
> On first run:
> 1) Accept email address
> 2) Accept username & password pairs
> 3) "Encrypt" username/password pairs with email address + some
> machine-dependent data as a key
> 4) Write these encrypted pairs and the email address to a text file
>=20
> On future runs:
> 1) Read the encrypted pairs
> 2) "Decrypt" them
> 3) Do stuff.
>=20
> The best idea I have now is some block-and-bit chunking and
> shifting - break
> the string to encrypt into variable-length chunks, shuffle,
> reassemble, bit
> rotate, repeat. The "decrypt" would simply reverse the process. My
> concern
> is that anybody who knows the algorithm will be able to reverse it
> quite
> easily, given access to the text file.
>=20
> Any help is appreciated!
>=20
> -Ed
>=20
>=20
>=20
>=20
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=3D=3D=3D=3D=3D
Signed=20
David Mcken

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Live with it

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Does he have control of the server side?

--- Reid Thompson <rei...@at...> wrote:
> Use a key -- implement the key in the server side code.
> If "remember my password" is checked on connection to server,
> generate the file data to be stored on the client side on the
> server and
> fave the server return the file data to the client, which writes it
> to 
> the client host filesystem.  Then, decryption/validation occurs on
> the
> server side on attempted connections and the server binary is the
> only
> place that the key can be found.
> 
> David McKen wrote:
> > By definition of your problem anyone who know your algorithm is
> going
> > to be able to decrypt the file. Essentially a hacker has all the
> info
> > they need if they get their hands on the algorithm and the file
> that
> > has both the e-mail and the encrypted data.
> > 
> > Including a bit of randomness is not going to be easy to do as
> you
> > have to somehow rember that random value for you to decrypt it
> every
> > time.
> > 
> > Possibly hide the encrypted data in a file with some other data.
> And
> > maybe store the e-mail seperate from the encrypted data. Make it
> > harder for a hacker to get the data they want, this assumes that
> a
> > potential hacker already knows the algorithm.
> > 
> > Hope This Helps
> > David McKen
> > 
> > --- Ed Cottrell <em...@to...> wrote:
> >  > Hello all,
> >  >
> >  > I need help on an algorithm. I need to accept
> username/password
> >  > combinations
> >  > on the client side of a client-server app, store those on the
> >  > client side,
> >  > and "decrypt" them again without user input, using only the
> stored
> >  > strings.
> >  > Think the "remember my password" function in MS Outlook, IE,
> etc.
> >  >
> >  > Ideally, I would like to do this:
> >  > On first run:
> >  > 1) Accept email address
> >  > 2) Accept username & password pairs
> >  > 3) "Encrypt" username/password pairs with email address + some
> >  > machine-dependent data as a key
> >  > 4) Write these encrypted pairs and the email address to a text
> file
> >  >
> >  > On future runs:
> >  > 1) Read the encrypted pairs
> >  > 2) "Decrypt" them
> >  > 3) Do stuff.
> >  >
> >  > The best idea I have now is some block-and-bit chunking and
> >  > shifting - break
> >  > the string to encrypt into variable-length chunks, shuffle,
> >  > reassemble, bit
> >  > rotate, repeat. The "decrypt" would simply reverse the
> process. My
> >  > concern
> >  > is that anybody who knows the algorithm will be able to
> reverse it
> >  > quite
> >  > easily, given access to the text file.
> >  >
> >  > Any help is appreciated!
> >  >
> >  > -Ed

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By definition of your problem anyone who know your algorithm is going
to be able to decrypt the file. Essentially a hacker has all the info
they need if they get their hands on the algorithm and the file that
has both the e-mail and the encrypted data. 

Including a bit of randomness is not going to be easy to do as you
have to somehow rember that random value for you to decrypt it every
time. 

Possibly hide the encrypted data in a file with some other data. And
maybe store the e-mail seperate from the encrypted data. Make it
harder for a hacker to get the data they want, this assumes that a
potential hacker already knows the algorithm.

Hope This Helps
David McKen

--- Ed Cottrell <em...@to...> wrote:
> Hello all,
> 
> I need help on an algorithm. I need to accept username/password
> combinations
> on the client side of a client-server app, store those on the
> client side,
> and "decrypt" them again without user input, using only the stored
> strings.
> Think the "remember my password" function in MS Outlook, IE, etc.
> 
> Ideally, I would like to do this:
> On first run:
> 1) Accept email address
> 2) Accept username & password pairs
> 3) "Encrypt" username/password pairs with email address + some
> machine-dependent data as a key
> 4) Write these encrypted pairs and the email address to a text file
> 
> On future runs:
> 1) Read the encrypted pairs
> 2) "Decrypt" them
> 3) Do stuff.
> 
> The best idea I have now is some block-and-bit chunking and
> shifting - break
> the string to encrypt into variable-length chunks, shuffle,
> reassemble, bit
> rotate, repeat. The "decrypt" would simply reverse the process. My
> concern
> is that anybody who knows the algorithm will be able to reverse it
> quite
> easily, given access to the text file.
> 
> Any help is appreciated!
> 
> -Ed
> 
> 
> 
> 
> -------------------------------------------------------
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=====
Signed 
David Mcken

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belvale loic wrote:

> When I begin programming with TCLITE, there was a library containing 
> easy to use graphic functions and named graphics.h. Does such a 
> library exists for Dev-C++ ?

use WebUpdate to get CLGDI DevPak

When I begin programming with TCLITE, there was a library containing 
easy to use graphic functions and named graphics.h. Does such a 
library exists for Dev-C++ ?

Thanks in advance

La meme en Francais : existe-t-il pour Dev-C++ un equivalent de la 
librairie graphics.h du C pour la programmation graphique ?

Merci d'avance
---------------------------------------------
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