C / C++ / MFC

Re: Storing data in a DLL

16-Mar-07 2:44

How about the Win32_TemperatureProbe WMI class?

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Storing data in a DLL

beko16-Mar-07 1:26

beko

16-Mar-07 1:26

Hello,

i need to protect some data (simple txt files). The idea here is just to protect data for wrong manipulation (i dont want to implement encryption at first place, 100 text files, i first thought i could zip/rar and use password but this seems bit unnecessary now)

I remember in one program, the data is stored in a DLL file.

My question is how i can store a simple text file in a DLL? or is it possible?

Thanks in advance.

Bekir.

David Crow16-Mar-07 2:46

Re: Storing data in a DLL

16-Mar-07 2:46

beko wrote:
My question is how i can store a simple text file in a DLL? or is it possible?

How about as a RT_RCDATA resource?

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

beko16-Mar-07 5:40

beko

16-Mar-07 5:40

Hello,

I have seen your article about using RT_RCDATA, thanks for the pointer.
I will give a try.

Thanks.

What's wrong?

_808616-Mar-07 1:05

_8086

16-Mar-07 1:05

void CMFCTest8Dlg::OnBnClickedButton1()
{
CFrameWnd* cfw = new CFrameWnd();
RECT rect;
rect.bottom =300;
rect.right =300;
rect.top=0;
rect.left=0;
LPRECT lprect=(LPRECT)new LPRECT();

this->GetWindowRect(lprect);
//cfw->Create(L"hi",L"hi",SW_NORMAL,(*lprect),this->GetWindow(1),0,0,0);

cfw->Create(L"hi",L"Ex04a Text Output",WS_CHILDWINDOW,CRect(20,30,350,140));

cfw->ShowWindow(SW_NORMAL);
cfw->UpdateWindow(); // Error here
}
Debug trace:

<br />
BOOL CWnd::ShowWindow(int nCmdShow)<br />
{<br />
	ASSERT(::IsWindow(m_hWnd) || (m_pCtrlSite != NULL));<br />
<br />
	if (m_pCtrlSite == NULL)<br />
		return ::ShowWindow(m_hWnd, nCmdShow);<br />
	else<br />
		return m_pCtrlSite->ShowWindow(nCmdShow); <---Threw erro here<br />
}<br />

286? WOWW! Blush | :O

prasad_som16-Mar-07 2:25

prasad_som

16-Mar-07 2:25

_8086 wrote:
cfw->Create(L"hi",L"Ex04a Text Output",WS_CHILDWINDOW,CRect(20,30,350,140));

Whats this API is returning ? I thing this call is failed. And probably, you need to set parent here.

Prasad
Notifier using ATL | Operator new[],delete[][^]

David Crow16-Mar-07 2:48

16-Mar-07 2:48

_8086 wrote:
ASSERT(::IsWindow(m_hWnd) || (m_pCtrlSite != NULL));

This should probably be using the logical AND operator (i.e., you want to assert that both conditions are true, rather than just one of them).

_8086 wrote:
return m_pCtrlSite->ShowWindow(nCmdShow); <---Threw erro here

What error?

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

prasad_som16-Mar-07 3:08

prasad_som

16-Mar-07 3:08

DavidCrow wrote:
_8086 wrote:
ASSERT(::IsWindow(m_hWnd) || (m_pCtrlSite != NULL));

This should probably be using the logical AND operator (i.e., you want to assert that both conditions are true, rather than just one of them).

He is refering to CWnd::ShowWindow code.

Prasad
Notifier using ATL | Operator new[],delete[][^]

David Crow16-Mar-07 3:14

16-Mar-07 3:14

prasad_som wrote:
He is refering to CWnd::ShowWindow code.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

TClarke16-Mar-07 3:10

TClarke

16-Mar-07 3:10

That's an unusual way of creating a pointer to a RECT. May I ask why you did not write?

LPRECT lprect = new RECT();

I'm just curious.

Tom

Philosophy: The art of never getting beyond the concept of life.

cp987616-Mar-07 20:29

cp9876

16-Mar-07 20:29

Tom,

your code also has the benefit of allocating a RECT struct for the GetWindowRect() function to write into - his code allocates a pointer only (a RECT** that he casts to a RECT*) - so GetWindowRect() will corrupt something when it writes to it.

Peter.

_808617-Mar-07 5:44

_8086

17-Mar-07 5:44

Does it look better now?

CFrameWnd* cfw = new CFrameWnd();
cfw->Create(L"hi",L"Ex04a Text Output",WS_CHILDWINDOW,CRect(20,30,350,140));
cfw->ShowWindow(SW_NORMAL);
cfw->UpdateWindow(); // Error here

what's wrong with this? Plz help.

286? WOWW! Blush | :O

cp987617-Mar-07 16:21

cp9876

17-Mar-07 16:21

I suspect that the Create call is failing - did you take Prasad's advice and check the return value?

If it is failing, carefully check the documentation and your parameter list. In particular, have you registered a windows class called "hi"?

Peter.

Dll protection

MinaFawzi16-Mar-07 0:28

MinaFawzi

16-Mar-07 0:28

Dear all

i am developing a dll that will contain some data which has to be protected from reverse engineering,
is there is any ideas to achieve this ?

Thanks

MiNa

Rajesh R Subramanian16-Mar-07 0:36

Rajesh R Subramanian

16-Mar-07 0:36

MinaFawzi wrote:
protected from reverse engineering,

What do you mean by reverse engineering?

Love is like pi - natural, irrational and very important
- Lisa Hoffman

Hamid_RT16-Mar-07 0:40

Hamid_RT

16-Mar-07 0:40

What do you need ?do you have any problem ?

WhiteSky

Rajesh R Subramanian16-Mar-07 1:00

Rajesh R Subramanian

16-Mar-07 1:00

You just posted your 4444th Message. Smile | :)

Cheers

Absence is to love what wind is to fire; it extinguishes the small, it enkindles the great
- Comte Debussy-Rabutin

Hamid_RT16-Mar-07 1:13

Hamid_RT

16-Mar-07 1:13

Oh yeah its round 4444 Big Grin | :-D

at 1 years,6 months I was tring to say good answers to people and I hope my answers was helpfuls;P

WhiteSky

Roger Stoltz16-Mar-07 0:47

Roger Stoltz

16-Mar-07 0:47

MinaFawzi wrote:
a dll that will contain some data which has to be protected from reverse engineering

What do you mean by this?
Do you really mean hardcoded data inside the DLL, or are you talking about code?

Either case I would say that it's not possible to create a water proof protection against reverse engineering since all code can be disassembled.
What you need to decide is how hard you want to make it for anyone that wants to reverse engineer your DLL.

If you actually mean data one way is to not align data in byte boundaries. Use bit fields that encapsulates the data you're using and don't use the first and last bits. This will however make your DLL slower since a lot of illusive code will be created to use the data.
Another way is to store the data outside the DLL, e.g. on a memory stick.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown