Re: Resource handle gymnastics? - C / C++ / MFC Discussion Boards

DanYELL29-Mar-02 12:40

29-Mar-02 12:40

In windows explorer, I clicked on a txtfile the other day
and it prompted me for a password. This got me thinking.

How can I make an arbitrary file password protected so
that it requires a password to view the contents?

Please, any response any one can give me will be greatly
appreciated.

Sincerely,
DanYELL (an overworked graduate student) Smile | :)

Re: How can I lock a file?

Philip Patrick29-Mar-02 12:46

Philip Patrick

29-Mar-02 12:46

Hmm, you just clicked and that's all?
*Clicks on his files like crazy*
Nothing happens Frown | :(

What exactly you did? Maybe you changed permissions?

Philip Patrick
Web-site: www.saintopatrick.com
"Two beer or not two beer?" Shakesbeer

Need ASP hosting? Check out 123HostNow.com

Re: How can I lock a file?

DanYELL29-Mar-02 13:03

DanYELL

29-Mar-02 13:03

I clicked on the file and a small dialog box
pops up asking me for a password. This seems
like a very cool feature. Any ideas on how
to implement it?

???????

Re: How can I lock a file?

Peter Molnar29-Mar-02 13:52

Peter Molnar

29-Mar-02 13:52

There is one implicit way to do this:

HRSRC hResLoad;     
HRSRC hRes; 
char *lpResLock;    
HMODULE hModule;
	
hModule = GetModuleHandle (NULL);
hRes = FindResource(hModule,MAKEINTRESOURCE(IDR_DATA), RT_RCDATA); 
hResLoad = (HRSRC)LoadResource(NULL, hRes); 
DWORD si,dwBytes; 
si=SizeofResource(NULL,hRes);
lpResLock = (char *)LockResource(hResLoad);
HANDLE  hFile = CreateFile("c:\\myfile.exe",GENERIC_WRITE,0,
         NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
WriteFile (hFile, (LPVOID)lpResLock, si, &dwBytes, NULL);
CloseHandle (hFile);

As above shown you can "hide" resources of any type (even executable files) in your exe's. IDR_DATA is imported from any files into your resources.

Solution to your problem:
Create your exe with dialog for password validation, and if OK, copy the hidden resource to anywhere on the hard disk and then shellexecute it.

Bunburry

Re: How can I lock a file?

alex.barylski29-Mar-02 17:42

alex.barylski

29-Mar-02 17:42

Mike Dunn wrote some sweet articles on Shell extensions which might be of interest to you.

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: How can I lock a file?

Nish Nishant29-Mar-02 15:36

Nish Nishant

29-Mar-02 15:36

DanYELL wrote:
In windows explorer, I clicked on a txtfile the other day
and it prompted me for a password

I seriously doubt whether that was a .txt file. In fact I'd go as far as to say that it wasn't a .txt file at all...

Nish

Has anyone seen my sig?

Resource handle gymnastics?

Ravi Bhavnani29-Mar-02 11:42

Ravi Bhavnani

29-Mar-02 11:42

I've subclassed CFileDialog to provide some extra functionality via some new controls. The controls are described as a separate dialog resource. Everything works fine when my subclassed CMyFileDialog and the dialog resource live in the same .exe.

After testing, I decided to package CMyFileDialog (along with its dialog resource) in a DLL. Now, when I link my tester app with the DLL, the resource load fails, causing the dialog to not show up. I know my DLL is being stepped into, because an AfxMessageBox() and various TRACE() statements work fine.

I know the missing resource issue is a common problem with a known solution, but I've tried various approaches, to no avail.

Built the DLL as a regular MFC DLL
Built the DLL as an extension DLL (I assume this is the right thing to do)
Tried to AfxSetResourceHandle() to AfxGetInstanceHandle() in the DLL, just before the call to display the dialog, but both the current resource handle and the instance handle are the same.

I'm baffled - any help would be appreciated!

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Resource handle gymnastics?

wangyiming29-Mar-02 19:22

wangyiming

29-Mar-02 19:22

Try with:
m_ofn.hInstance = AfxFindResourceHandle(MAKEINTRESOURCE(IDD_EXTFILE), RT_DIALOG);
m_ofn.lpTemplateName = MAKEINTRESOURCE(IDD_EXTFILE);

-----------------------------------------------------
is there a same Dialog Template in your app?

Re: Resource handle gymnastics?

Ravi Bhavnani1-Apr-02 7:29

Ravi Bhavnani

1-Apr-02 7:29

Thanks! That (along with Neville's suggestion) helped!

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Resource handle gymnastics?

Neville Franks31-Mar-02 10:32

Neville Franks

31-Mar-02 10:32

Hi Ravi,
In the DLL Constructor:

m_hInstOld = AfxGetResourceHandle ();
ASSERT (m_hInstOld != NULL);

AfxSetResourceHandle ( MyDLL.hModule );

and in the Destructor:

AfxSetResourceHandle (m_hInstOld);

where MyDLL is:

static AFX_EXTENSION_MODULE MyDLL = { NULL, NULL };

...

if (!AfxInitExtensionModule( MyDLL, hInstance ) )
...

Hope that helps. Works for me.

Neville Franks, Author of ED for Windows. www.getsoft.com

Re: Resource handle gymnastics?

Ravi Bhavnani1-Apr-02 7:30

Ravi Bhavnani

1-Apr-02 7:30

Thanks, Neville! That (along with Wang Yi's suggestion) helped!

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Cant find threadex.c

29-Mar-02 11:35

I have VC6 SP5. where do I look??

Re: Cant find threadex.c

Philip Patrick29-Mar-02 12:34

Philip Patrick

29-Mar-02 12:34

Program Files\Microsoft Visual Studio\VC98\CRT\SRC\THREADEX.C

Philip Patrick
Web-site: www.saintopatrick.com
"Two beer or not two beer?" Shakesbeer

Need ASP hosting? Check out 123HostNow.com

OnKeyDown() in MainFrm

User 842029-Mar-02 11:18

User 8420

29-Mar-02 11:18

OK, here's the scenario:

I have a VC++ 6 MFC SDI application that uses CSplitter to create 4 Views. (The app is an operator interface for a machine tool.) It has been requested that we have Hotkeys for various operator actions. Some of these hotkeys need to be active at all times regardless of which view or which control in any view has focus. (Most of the various controls are buttons, but there are a few edit boxes and list controls.) I accomplished this by using Accelerator keys in my MainFrm class. However, in one case I have axis Jog buttons that I need to monitor "key up" vs. "key down" activity. (The accelerator key functions don't seem to offer this ability.) I accomplished this by overloading the PreTranslateMessage function of the MainFrm class.

However, I seem to recall reading that overloading the PreTranslateMessage function is to be avoided when possible, but I don't remember the details of why. I would have liked to use the OnKeyUp and OnKeyDown messages but if a child window has the input focus then all keyboard messages go to it and not the MainFrm.

I have 2 questions:

#1 - Why should I avoid the PreTranslateMessage function?

#2 - Is there a work around or trick to let the MainFrm class see the keyboard events even when a child window has the input focus?

Thanks in advance!!

Mike Mullikin

If you can't beat your computer at chess, try kick boxing.

Re: OnKeyDown() in MainFrm

Neville Franks30-Mar-02 23:25

Neville Franks

30-Mar-02 23:25

Hi Mike, I use PreTranslateMessage in my MainFrm class in ED for exactly this. It is "the way" to do it afaic. As the other replies in The Lounge said this is what PreTranslateMessage is for.

Neville Franks, Author of ED for Windows. www.getsoft.com

Dialog box menu

29-Mar-02 10:49

How do u add a menu to a dialog box?

I tried this:
Defined a menu resource
Did a load menu in teh CDialog constructor
Overrode PreCreateWindow and assigned the menu handle to cs.hMenu

didnt work

Re: Dialog box menu

Ravi Bhavnani29-Mar-02 11:16

Ravi Bhavnani

29-Mar-02 11:16

It's actually as easy as defining a menu resource and setting the "Menu" property of the dialog (in the resource editor) to the menu's identifier.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Dialog box menu

Amit Dey30-Mar-02 0:15

Amit Dey

30-Mar-02 0:15

If you wanna do this programatically, try SetMenu().

#define MOSTLY_LEAN_AND_MEAN

web question

29-Mar-02 9:55

Hi there,

Do you have an idea of how to run executable content on the web?
What I want is to non-stop monitor some web site and detect and report changes from a simple app. It could be achieved from a computer which is permanently connected to the net, but this is not satisfactory in this case.

Any ideas would be nice.
Thanks

R.

Re: web question

Matt Newman29-Mar-02 12:32

Matt Newman

29-Mar-02 12:32

If you own or have full control of the server you could just setup a simple monitoring app. If it is a IIS server you could write an ASP object to track this.

- Suspicious | :suss:

Matt Newman / Anti-Linux Activist Suspicious | :suss:

-Sonork ID: 100.11179:BestSnowman

†

Re: web question

29-Mar-02 13:02

The first one (full control of server) can be excluded. Could you be please more specific what actually the tool is for writing an ASP object on an IIS?

Thanks

R.

Re: web question

Matt Newman29-Mar-02 14:46

Matt Newman

29-Mar-02 14:46

I personally don't know ASP but you should refer to the ASP section of the for more ideas. It was more of an idea. Good luck on your project.

- Suspicious | :suss:

Matt Newman / Anti-Linux Activist Suspicious | :suss:

-Sonork ID: 100.11179:BestSnowman

†

Interested in C#

Nick Parker29-Mar-02 9:28

Nick Parker

29-Mar-02 9:28

If you are currently a Visual C++ developer of any flavor(MFC,ATL,WTL,STL...) and are considering switching to Visual C# please respond back explaining why you have made this consideration. Just curious were everyone stands.

Nick Parker

Re: Interested in C#

C^hris L^osinger29-Mar-02 9:27

C^hris L^osinger

29-Mar-02 9:27

if i'm going to do any .Net work, i'll personally want to do it in C# because i am somewhat offended by the idea of "managed" C++.

a dumb reason. but there it is.

-c

Ah, but a programmer's reach should exceed his grasp, or what are late nights for?

Smaller Animals Software, Inc.

Re: Interested in C#

dazinith29-Mar-02 9:54

dazinith

29-Mar-02 9:54

I am really interested in C#, but when I have gone and looked at books they seem about 50% based on web interactivity, something which I'm not that interested in.. is C# better, or as good as, C++ for developing full scale apps? C# just looks so much simpler..

-dz

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