C / C++ / MFC Discussion Boards

Rashid Thadha22-Nov-01 1:19

22-Nov-01 1:19

Use ADO, rather then the ODBC MFC CRecordset Class

See ADO samples here

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ado270/htm/mdmscadocodeexamplesinvisualc.asp

Putting value ...

Hadi Rezaee21-Nov-01 23:16

Hadi Rezaee

21-Nov-01 23:16

Hi all,
I maked instance of CComboBox class (my class name is CMyCombo) !

and i wrote some new functions in new class ...
In one of functions i must put value to the Editbox in my form (dialog).

How can i do that ?
I mean putting value to editbox from my new class !

OMG | :OMG:

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

Re: Putting value ...

Christian Graus22-Nov-01 1:22

Christian Graus

22-Nov-01 1:22

Hadi_Rezaie wrote:
I maked instance of CComboBox class (my class name is CMyCombo) !

and i wrote some new functions in new class ...
In one of functions i must put value to the Editbox in my form (dialog).

How can i do that ?
I mean putting value to editbox from my new class !

Doing this will mean your new Combo will not be reusable, which makes it a bad design. However, all you do is ( assuming your Editbox is a member variable called m_Edit, m_szText is a member variable containing the text to put into it, and your class is called CHadiDlg )

CHadiDlg * pDlg = dynamic_cast<CHaduDlg*>(GetParent());
ASSERT(pDlg);
pDlg->m_Edit.SetWindowText(m_szText);

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Debug Assertion Failed????

Dan Madden21-Nov-01 23:04

Dan Madden

21-Nov-01 23:04

Hi,
I am developing an Aplication to watch/manage my IDS Nodes. It runs fine when I run in Release mode. Once I go to Debug I get the Assertion.

// Dispatch commands specified on the command line
if (!ProcessShellCommand(cmdInfo))
return FALSE;

Any help appreciated...

Thanks in advance,

Dan

Re: Debug Assertion Failed????

Michael Dunn22-Nov-01 0:44

Michael Dunn

22-Nov-01 0:44

Where is the assert that's failing. An assert means you have a bug in your code; look for comments at the assert to tell you what it's checking for.

--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
Heart | [heart]

your

with

and

Sonork - 100.10414 AcidHelm

Re: Debug Assertion Failed????

Dan Madden22-Nov-01 0:59

Dan Madden

22-Nov-01 0:59

I sent you the Assertion I am getting in a seperate mail.

It is failing on...(BTW, this is a SDI Application)

// Dispatch commands specified on the command line
if (!ProcessShellCommand(cmdInfo))
return FALSE;

This doesn't mean it is not my code, but it won't let me debug to find the Assertion...any ideas??

Thanks in advance,

Dan

Re: Debug Assertion Failed????

Michael Dunn22-Nov-01 1:15

Michael Dunn

22-Nov-01 1:15

Click Retry when you get the assert-failed message box to drop into the debugger.

--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
Heart | [heart]

your

with

and

Sonork - 100.10414 AcidHelm

Re: Debug Assertion Failed????

luckylourson22-Nov-01 3:23

luckylourson

22-Nov-01 3:23

It has arrived to me a short time ago. The program crashed at the return of a function. I only checked the "link incrementaly" option in debug mode. If it works in release mode...your code is probably not the probleme.

Network drive UNC?

21-Nov-01 20:45

In the registry is in HKEY_CURRENT_USER/Network
path, where some(!) network drive UNC paths can
be found. Now I wonder where are the rest???

I am trying to make a program that will show the
paths. I have tried it on several computers, and
I have found that not all the network drives are
listed in the registry.

How could I read the UNC path for ALL network drives?
API functions for that??

Re: Network drive UNC?

Bruce Duncan21-Nov-01 21:08

Bruce Duncan

21-Nov-01 21:08

Marko wrote:
API functions for that??

Maybe NetUseEnum is what you're after...

The NetUseEnum function lists all current connections between the local computer and resources on remote servers.

Bruce Duncan | The Digital Delirium | Sonork ID 100.10030 Aythos

Re: Network drive UNC?

22-Nov-01 2:40

Thanks, you showed me the right way. Smile | :)

I started searching information about NetUseEnum and ended up with WNetGetConnection, which does the trick.

Plugins

Deian21-Nov-01 20:06

Deian

21-Nov-01 20:06

Hello MFC gurus. I'm looking for some link/source on documentation on how to create/implement application that uses plugins. The only solution that I came up to is making external plugins - by limiting the functions in the dll, and I think that this isn't the way that the plugins should work. If I want external dll - I could simply write a program that does the specified functions. My point is that I want my dll to be the part that does everything but it should get/do/set data inside my main program. It's something like the winamp's general purpose dll's or like the way BO2K is done, but I can't figure out how to implement a plugin technique in my application. Any
help/link/source/book suggestions are welcome.

Greetings,

Deian

Hacking into system Dlls

21-Nov-01 14:30

Hello,

I am creating an application that utilizes CryptoAPI and concerned whether it is possible to hack and extract my DES/RSA keys [which are hard coded in my app. and imported into CryptoAPI using CryptImportKey()] from it using one of the following methods:

(1) replacing the CryptoAPI dll (advapi32.dll) with some dll that will be loaded between the CryptoAPI dll and the executable. This dll will store the keys in some db and then forward the call to the CryptoAPI dll. The user might not even be aware that this is happening.

(2) Since the CryptoAPI methods are exported by name and their addresses are known - it is possible to run the application under a debugger, put a breakpoint in memory in the function CrypyImportKey() and using assmebler knowledge track down the location in memory of the passed parameters and reveal the key.

Anybody got any knowledge whether any of these is possible?
Thanks a lot!

Re: Hacking into system Dlls

Rassman22-Nov-01 2:16

Rassman

22-Nov-01 2:16

I think that you may be confusing the key with the password.

Lets say a hacker virus got onto your compuetr, then it managed to fool your anti-virus into thinking that changing a system dll is ok. Then the hacker finds and passes the key to himself. This part of cause is possible, so I'm not saying it can't be done somehow. We have to assume that not all software users are as aware as us here of how important security on a PC is.

Anyway, all he has then is the key, not the password.

If you were using this program for, say, a secure site, then you would pass the key to your users, depending on your security system it could be
. once only
. on a per day basis
. per log in is not a good one for public traffic because a hacker only has to keep pounding you with login attempts to get a pattern to your security, which is something that I read recently. The hole is this case was blocked. (I refuse to say it was on a Linux site, cos I have mates on there).
. and others

The key is used on the local machine with the users password to create a, erm, dam dam, I've forgotten the proper word for it, lets call it a ReturnValue (I'm sure I'll remember the word in a minute).

From then on, its that ReturnValue that is used to log in the user and identify his traffic (if you intend to go that far, which is wise since if it needs secure users it also needs secure messaging in my book).

The imaginary hacker who stole the key has to still know or hack the password, plus has to work out which of the algorithms you used. He has to be carefull incase your key is date/time related so must keep his computer within a timeframe.

I'm not saying hacking Crypt's can't be done, but unless too much info is given to potential hackers, its a long time consuming process.

What is that word for the returned value? its in my head somewhere.....

We do it for the joy of seeing the users struggle.

Combo Box Problem

mvworld21-Nov-01 14:23

mvworld

21-Nov-01 14:23

Hello,

Well I have this funny problem. I want to add items to my combo box in a child dialog box from my parent dialog box just before the child is shown.

To do this I have the following line

ChildDlg.m_ComboBox.AddString("Some Text");

I even tried

ChildDlg.m_ComboBox.InsertString(0, "Some Text");

I made sure too that the member variable m_ComboBox in the class ChildDlg referred to the contro (not the value) of my Combo box.

What is wrong?

Thanks,
Mike

Re: Combo Box Problem

Sidney Chong21-Nov-01 14:42

Sidney Chong

21-Nov-01 14:42

Hi Mike, you have to tell us what the funny problem is. e.g. the app crashed (hm... thats really helpful), combo box not being updated, etc...

Oh, and in which message handler are you calling the "AddString"/"InsertString" methods?

Re: Combo Box Problem

mvworld21-Nov-01 14:47

mvworld

21-Nov-01 14:47

Well the application crashes.

I have a main dialog box and in one of the functions I create a child dialog box which has the member variable m_ComboBox as public.

So in my main dialog box I have

CChildDialog ChildDlg;
ChildDlg.m_ComboBox.AddString("Some Text");
ChildDlg.DoModal();

And then when I run this application, it crashes.

So to test again I tried to Add a string to the combobox in the constructor of my child dialog but the application still crashed!

What shall I do?

Re: Combo Box Problem

Masaaki Onishi21-Nov-01 15:05

Masaaki Onishi

21-Nov-01 15:05

Hello, the codegurus around the world.;)

I think that DoModal() must call OnInitDialog() in CChildDialog.
So, the location between ChilDlg and DoModal() will not
create ComboBox yet.

So, I think that you had better put AddString(...) in OnInitDialog()
of CChildDialog.

CChildDialog ChildDlg;
ChildDlg.m_string = _T("Some Text");
ChildDlg.DoModal();

And in OnInitDialog() of ChildDlg

//Already, m_string is updated!
m_ComboBox.AddString (m_string);

Have a nice day!

-Masaaki Onishi-

Re: Combo Box Problem

mvworld21-Nov-01 15:13

mvworld

21-Nov-01 15:13

But there is no OnInitDialog() in my child dialog class!!
Even when I tried to override OnInitDialog (hoping it was there in CDialog) it did not have it already defined in the base class.

Re: WM_INITDIALOG

Masaaki Onishi21-Nov-01 17:33

Masaaki Onishi

21-Nov-01 17:33

Hello, the codegurus around the world.;)

You can manually add OnInitDialog() with WM_INITDIALOG.

Or use WM_INITDIALOG by the class wizard, and this automatically
generates the message and its handler in CChildDlg class. Roll eyes | :rolleyes:

Have a nice day!

-Masaaki Onishi-

Re: Combo Box Problem

Sidney Chong21-Nov-01 15:21

Sidney Chong

21-Nov-01 15:21

Well, here's the problem... the control hasn't been created yet! MFC's UI classes are really wrappers around the Win32 equivalents. Having constructed the class does not imply that the corresponding controls have been created. So what you want to do is the following:

(1) create a data member (a string or an array of strings maybe?) in your child dialog to hold the data thats going into the combo box.
(2) set this data member after you have created the child dialog but before the call to DoModal (DUH!)
(3) override OnInitDialog of the child dialog (or OnCreate if its not a dialog) to pass this data into the combo box using AddString or InsertString, whichever you prefer.

--update--
Oh bugger, Masaaki beat me to it..... Poke tongue | ;-P

my link sux! Mad | :mad:

Re: Combo Box Problem

mvworld21-Nov-01 15:49

mvworld

21-Nov-01 15:49

Hey,

I did as you told me. But now the application still mysteriously crashes.

What I want to do is that just before the child appears, a function in the main dialog box (the parent) provides the child with stuff the child needs to show in the combo box.

Since in the child I have a pointer to the parent, so I used it to call the function which should provide the child with the data for the combo box.
But somehow the application crashes!

Are we allowed to call other functions inside the OnInitDialog/OnInitInstance?

Re: Combo Box Problem

Sidney Chong21-Nov-01 16:46

Sidney Chong

21-Nov-01 16:46

Yes you are allowed to call other functions in those methods. But note that in your particular case, you should be using OnInitDialog instead of OnInitInstance

-- sample pulled from MSDN --
IMPT NOTE: Remember to call the base class' OnInitDialog as shown in the sample!!

// MyDialog.cpp
#include "MyDialog.h"

BOOL CMyDialog::OnInitDialog() 
{
   //call the base implementation first!
   CDialog::OnInitDialog(); 
   
   // TODO: Add extra initialization here
   m_cMyEdit.SetWindowText("My Name"); // Initialize control values
   m_cMyList.ShowWindow(SW_HIDE);      // Show or hide a control, etc.

   return TRUE;   // return TRUE unless you set the focus to a control
                  // EXCEPTION: OCX Property Pages should return FALSE
}

Re: Combo Box Problem

Michael Dunn21-Nov-01 17:47

Michael Dunn

21-Nov-01 17:47

The other replies have been hit-and-miss, so I'll summarize here.

You're confusing the dialog C++ object with the dialog window. The window does not get created until you call DoModal(). There is no dialog, and thus no controls to manipulate, before the DoModal() call.

The proper way is to override OnInitDialog() in your dialog's C++ class. At the time WM_INITDIALOG is sent, the window and all child controls have been created, but not yet shown. So at that time, it's fine to set up the controls.

--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
Heart | [heart]

your

with

and

Sonork ID - 100.10414 AcidHelm

Re: Combo Box Problem

luckylourson21-Nov-01 22:07

luckylourson

21-Nov-01 22:07

I don't understand why you don't fill the combo box after the DoModal()..It's not a properly way but it is sure.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.