Re: Text Encryption for text editor on the save button - C / C++ / MFC Discussion Boards

Joaquín M López Muñoz14-Feb-02 3:20

14-Feb-02 3:20

Yes you can. From the point of view of the local flow within the function, each throw behaves as a return.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: try,throw, catch

Tim Smith14-Feb-02 4:55

Tim Smith

14-Feb-02 4:55

Just an FYI. Throws should never be used as part of normal program flow. The overhead is massive.

Exceptions (i.e. throws) should only be used for that, exceptions to normal program flow.

Tim Smith
Descartes Systems Sciences, Inc.

How you minimize child window in MDI app ?

14-Feb-02 1:39

ShowWindow (hWnd, SW_MINIMIZE) doesn't work in this case and
neither does WM_SYSCOMMAND with wParam = SC_MINIMIZE.

There's no counterpart to WM_MDIMAXIMIZE and I want all the child windows minimized by one command in the menu. Any idea?

Re: How you minimize child window in MDI app ?

Joaquín M López Muñoz14-Feb-02 2:01

Joaquín M López Muñoz

14-Feb-02 2:01

Iterate truough the children window of the frame with EnumChildWindows and call CWnd::ShowWindow(SW_MINIMIZE) on each of them.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

I did it that way

14-Feb-02 2:13

Windows weren't minimized in MDI fashion, that is as small bars with icon, text, close and minimize, maximize buttons.
Instead it was only one small bar in the lower left corner of MDI frame window - for all childs !

Re: I did it that way

Joaquín M López Muñoz14-Feb-02 4:23

Joaquín M López Muñoz

14-Feb-02 4:23

Yep, I've reproduced the behavior you describe. Try putting the command handler in your CMainFrame and passing m_hWndMDIClient as the hwnd parameter or EnumChildWindows (I've just done it and it works, though a little slowly).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Text Encryption for text editor on the save button

14-Feb-02 1:33

I am new to all this and have made a text editor ( one of the most easy things
to start with ) but i want it to save an encrypted file that no other text
editor could read, so when you click save it asks for a password the saves
the encrypted text then when someone tries to load it they have to enter
the password??

Thanks in advance Steven Richardson!

P.S. i have Borland C++ Builder 5

Re: Text Encryption for text editor on the save button

Navier15-Feb-02 14:42

Navier

15-Feb-02 14:42

How long is a piece of string? A really easy way to do it is just to take the raw text and XOR each byte with a constant byte value. That turns the text into garbage. Then you check the password. If it matches you XOR each byte of the garbage with the same constant byte and voila your original text is back.

Example:

Encryption - 101 xor 011 = 110
Decryption - 110 xor 011 = 101

This is really insecure but it's dead easy. It depends on what level of security you need. If you're just looking for something to stop casual observers then this will do the trick but if you expect someone to expend some effort in cracking your encrypted text and it's security is important then you need to look for something more significant than this.

There are plenty of industrial strength algorithms about but I'm no expert on current practices. Just google for 'encryption' for details.

The other potential problem with what you propose is that your security model is trivially broken if the password is revealed. Look for 'public key encryption' to avoid this.

HTH

i1.2sqrt(u).bcos(ur)sec(c)
but
b4.isqrt(u).ru/16

Navier

Question about socket programming

cdehelean14-Feb-02 1:00

cdehelean

14-Feb-02 1:00

Hi, I have following technical question. Maybe someone has the knowhow, so I wouldm´t have to worry about seeking further
I have a server, he receives from somewhare a port number. So I want to find out what process communicates wia this port.

More rigurous:
I would like to find a method about determining a Process ID knowing a port number of a connection opened by this process.

Any hint would be highly appreciated.

Thanx

Bla´bla

Re: Question about socket programming

Navier15-Feb-02 14:47

Navier

15-Feb-02 14:47

I don't know how it's done but Foundstone have a free tool called FPort (in the Intrusion Detection section) that will do it for you. As far as I'm concerned actually doing this is deep voodoo.

i1.2sqrt(u).bcos(ur)sec(c)
but
b4.isqrt(u).ru/16

Navier

Client Area

Stan the man14-Feb-02 0:50

Stan the man

14-Feb-02 0:50

I am trying to print an area of the screen (specifically the VIEW only). I have a Dialog bar on top. When I do a GetClient rect, I get the size of the VIEW. This is fine. However, I grab the DC of the screen which includes the bar. The screen coordinates has the right width and height dimensions but not the offset to take into account the bar which I don,t want. From my view how would I get the dimensions of the View RELATIVE to the entire screen? Any other way? I am putting this in a derived view which ALL my views derive from. Thus, I really do not want to make this specific for this app but instead a general solution without knowing if there is none, one or ... Dialog bars on top.

Thanks in advance.

Re: Client Area

Joaquín M López Muñoz14-Feb-02 2:07

Joaquín M López Muñoz

14-Feb-02 2:07

Hi Stan, maybe

<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcmfc98/html/_mfc_cwnd.3a3a.clienttoscreen.asp">CWnd::ClientToScreen</a>

is the function you're looking for.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

A simple question,can anybody answer me?

Angel Kid14-Feb-02 0:18

Angel Kid

14-Feb-02 0:18

I wrote the codes:
#include <iostream.h>
void main()
{
int flag=0;
int i,j,k;
for(i=2;i>3;i++)
{
for(j=0;j>9;j++)
{
for(k=0;k>9;k++)
{
if(i+j+k==12&&i*j*k==42)
{flag=1;
cout<

Re: A simple question,can anybody answer me?

Angel Kid14-Feb-02 0:20

Angel Kid

14-Feb-02 0:20

sorry , I forgot the header
#include <iostream.h>
but the problem still in

Re: A simple question,can anybody answer me?

Nish Nishant14-Feb-02 0:45

Nish Nishant

14-Feb-02 0:45

Actually you didnt forget the header.
The < and > are taken as html tags.
Tick the no-html check box and re-post it.
Also put it as pre tagged.

Nish

Nish was here, now Nish has gone;
He left his soul, to turn you on;
Those who knew Nish, knew him well;
Those who didn't, can go to hell.

I like to Jig | [Dance]

on the Code Project

Sonork ID 100.9786 voidmain
www.busterboy.org

Re: A simple question,can anybody answer me?

Jon Hulatt14-Feb-02 0:56

Jon Hulatt

14-Feb-02 0:56

Your linker error is not really anything to do with your code. i suspect that either cl.exe is missing, broken, or not in the PATH.

One observation of your code though,

for(i=2;i>3;i++)

means that your code actually won't run. every time execution meets the for statement, it evaluates your condition (i>3) and only continues if it is True.

On the first iteration, i=2. Therefore, i>3 is false, and it will skip the entire for {..} block.

Note that this is not the cause of your linker error, just a problem i noticed.

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: A simple question,can anybody answer me?

Angel Kid14-Feb-02 2:39

Angel Kid

14-Feb-02 2:39

Jon Hulatt wrote:
One observation of your code though,

for(i=2;i>3;i++)

means that your code actually won't run. every time execution meets the for statement, it evaluates your condition (i>3) and only continues if it is True.

YES,you are right.
the right codes are that:
for(i=2;i<=3;i++);

I forgot that,thanks for your help.

Re: A simple question,can anybody answer me?

Carlos Antollini14-Feb-02 2:50

Carlos Antollini

14-Feb-02 2:50

Alpha_No1 wrote:
Error spawning cl.exe

What is the error code?

Regards....

Carlos Antollini.
Sonork ID 100.10529 cantollini

Re:Error spawn...

Atul Dharne14-Feb-02 3:04

Atul Dharne

14-Feb-02 3:04

Here cl.exe is the MS 32-bit C/C++ compiler. The reason for the error may be that the path to this compiler has not been set. Go to Tools -> Options -> Directories in your VC IDE and check your paths to Executable Files.
The cl.exe file is normally in your bin directory.

Atul

Sonork 100.13714 netdiva

Re:Error spawn...

Angel Kid14-Feb-02 4:07

Angel Kid

14-Feb-02 4:07

Thank you,I have solved the problem.I reinstalled the VC++.

OLE automation

Gérald Mercet13-Feb-02 22:54

Gérald Mercet

13-Feb-02 22:54

If i want to use automation in my application because a part of input data are in excel, it will be arrays, and as i want to return my result into excel's cells, i believe that i could use this method. But, now i have a question about how i could consider an array which is in excel? Could i use naturally regular pointers, or should i use others types?

thanks in advance for your answers.

gerald

Trying to call an ATL Com Object from MFC

Braulio Dez13-Feb-02 22:52

Braulio Dez

13-Feb-02 22:52

Hi,

I have an MFC application, that runs Ms Word, I want to paste in that instance of Ms Word an ActiveX control that I have created, to make that I call this: COleVariant

// m_pWord is just the instance of Word Running
vClassType = "GrAxProof.GDIGraphics";  
IDispatch *pDispatch = m_pWord->GetSelection()->InlineShapes->AddOLEObject(vClassType);      
IGDIGraphics Control(pDispatch);

Then I want to execute some method from that ActiveX control that I already created on Word ( to make that I imported the dispatch interface into my word App, and I call the following code):

IGDIGraphics Control(pDispatch);

COleVariant x((long) 10, VT_I4);
COleVariant y((long) 10, VT_I4);
COleVariant title(TEXT("Method called from the App"));
Control.DrTextSimple(x, y, title);

But when I call the DrTextSimple method ( or any other), the program crashes... Frown | :-(

Any help ?, Thanks in advance, Bye !
Braulio

Please help on Error LNK2001

DengJW13-Feb-02 22:06

DengJW

13-Feb-02 22:06

After successful compilation, While I was trying to link and build the executable using VC++ 6, I got error messages like:

Linking...
ScreenSaver.obj : error LNK2001: unresolved external symbol _DefScreenSaverProc@16
ScreenSaver.obj : error LNK2001: unresolved external symbol __imp__KillTimer@8
ScreenSaver.obj : error LNK2001: unresolved external symbol __imp__TextOutA@20
ScreenSaver.obj : error LNK2001: unresolved external symbol __imp__SetTextColor@8
ScreenSaver.obj : error LNK2001: unresolved external symbol __imp__SetBkColor@8
ScreenSaver.obj : error LNK2001: unresolved external symbol __imp__ReleaseDC@8

Does that mean some Dll or head files had not been included in the program which were supposed to?

Thanks,

DJ

Re: Please help on Error LNK2001

Paul M Watt13-Feb-02 22:18

Paul M Watt

13-Feb-02 22:18

It does mean that a dll or actaull a .lib file was not correctly linked to your project. This can be solved by finding which library these functions and sometimes variables reside in. In your case, DefScreenSaverProc resides in scrnsave.lib, KillTimer is in user32.lib, and the others are in GDI32.lib.

You can fix this by adding these filenames to your project settings. Go to the Project | Settings menu, then click on the Link tab. Change the Category tab to Input, and enter these library files in the Object/Library Modules line separated by a space.

The next time you compile, the linker will attmept to link these modules to your application and everything should be ok.

Re: Please help on Error LNK2001

DengJW13-Feb-02 23:03

DengJW

13-Feb-02 23:03

I got it.

Thanks, Kilowatt.

DJ

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