C / C++ / MFC Discussion Boards

Re: Anit Copy

Max Santos14-Aug-06 10:51

Max Santos

14-Aug-06 10:51

waldermort wrote:
1. Self modifying code
2. Self detecting if exe has been copied

the only thing i can think of is using resources, reate some kind of CRC em embedd it in a resource (ex: image)

However this is easy to crack Frown | :(

waldermort wrote:
PC serial numbers (anything unique to a single computer)

Network card adapter number (MAC address)?
People could allways change the card from one PC to another, but the software only works wher the card is.

Re: Anit Copy

Waldermort14-Aug-06 15:17

Waldermort

14-Aug-06 15:17

Thanks for all the ideas everybody. This project is just something I would like to try in the near future. I guess I have a bit more reading to do before I make a start.

Problem in MSMQEvent.

uday kiran janaswamy14-Aug-06 1:00

uday kiran janaswamy

14-Aug-06 1:00

Hi all,

I have explored the MSMQEvent in VC++. But i can't get a Clear Picture, which is used to Capture the Arrival of any Message from the End User to invoke the MSMQ Service.

I want an example on MSMQEvent, Not all other stuff on MSMQ. please help me out.

Uday kiran

how to set the menu bar???

mimimimilaw13-Aug-06 23:33

mimimimilaw

13-Aug-06 23:33

I want to set the menu bar to be ticked or not to be ticked by code. How to do it...

Photo[^]

Re: how to set the menu bar???

prasad_som13-Aug-06 23:41

prasad_som

13-Aug-06 23:41

have you seen CheckMenuItem

Prasad
Notifier using ATL

Re: how to set the menu bar???

mimimimilaw13-Aug-06 23:50

mimimimilaw

13-Aug-06 23:50

DWORD CheckMenuItem(HMENU hmenu,
UINT uIDCheckItem,
UINT uCheck
);

what is HMENU hmenu?

Re: how to set the menu bar???

prasad_som13-Aug-06 23:58

prasad_som

13-Aug-06 23:58

mimimimilaw wrote:
what is HMENU hmenu?

Its handle to menu,
Have you seen this example

Prasad
Notifier using ATL

Re: how to set the menu bar???

mimimimilaw14-Aug-06 0:41

mimimimilaw

14-Aug-06 0:41

Thx a lot
i can do it

Re: how to set the menu bar???

Hamid_RT14-Aug-06 1:16

Hamid_RT

14-Aug-06 1:16

<br />
(1)<br />
HMENU hmenu=::GetMenu(m_hWnd);<br />
CheckMenuItem(/*Handle from menu(HMENU)*/<br />
			  GetSubMenu(hmenu,0),ID_FILE_OPEN,MF_BYCOMMAND|MF_CHECKED);<br />
---------------------<br />
(2)<br />
	CMenu *menu=GetMenu();<br />
	CMenu *menu22=menu->GetSubMenu(0);<br />
menu22->CheckMenuItem(ID_FILE_OPEN,MF_BYCOMMAND|MF_CHECKED);<br />
<br />

WhiteSky

How can i design, To calculate's the objects in a class

premkamalg13-Aug-06 23:20

premkamalg

13-Aug-06 23:20

Hai,
plz help me ,

1) i want to design a program that should calculate's the objects in a class.
in which way i design that problem .
plz help

-- modified at 5:21 Monday 14th August, 2006

Hi,
Thanks, if u think it's good.
otherwise sorry.

Re: How can i design, To calculate's the objects in a class

Milton Karimbekallil14-Aug-06 1:20

Milton Karimbekallil

14-Aug-06 1:20

U r looking for objects in a class or objects of a class? If it is the later, ie how to track the the number of objects created for a class, u can use below demo.

class InstanceCntDemo{<br />
<br />
private :<br />
	static int nCnt;	<br />
public:<br />
	InstanceCntDemo(){<br />
		nCnt++;<br />
	}<br />
	static int GetCnt()<br />
	{<br />
		return nCnt;<br />
	}<br />
};<br />
int InstanceCntDemo::nCnt =0;<br />
<br />
int main(){<br />
<br />
	InstanceCntDemo ic;<br />
	InstanceCntDemo ic1;<br />
	InstanceCntDemo ic2;<br />
	InstanceCntDemo ic3;<br />
<br />
	int nCnt = InstanceCntDemo::GetCnt(); <br />
};

Does this make sense?

Cheers MiltonKB.

Re: How can i design, To calculate's the objects in a class

premkamalg16-Aug-06 1:27

premkamalg

16-Aug-06 1:27

Thanks Mr.MiltonKB.

Hi,
Thanks, if u think it's good.
otherwise sorry.

Limiting an application to single instance...problem? [modified]

Vinod Sankaranarayanan13-Aug-06 23:16

Vinod Sankaranarayanan

13-Aug-06 23:16

Dear all,

I had one MDI application and I want to limit its execution to single instance.

I had tried source code from lots of articles (i.e Newcomer's, Naughter ...Armen...)

it will work ...but while closing the second instance it raises an exception ...

Abnormal program termination!!!

This exception generated from "WinMain" when the
"pthread->ExitInstance()" get called...

How can I solve this ?

I am using Windows XP SP2 .....and VC++ 6.0

Thanks in advance......

-- modified at 5:17 Monday 14th August, 2006

vinsankar

Re: Limiting an application to single instance...problem?

prasad_som13-Aug-06 23:44

prasad_som

13-Aug-06 23:44

how you are limiting its instances ?

Prasad
Notifier using ATL

Re: Limiting an application to single instance...problem?

Vinod Sankaranarayanan14-Aug-06 0:01

Vinod Sankaranarayanan

14-Aug-06 0:01

Hi,
Try these links......

1.
http://www.codeproject.com/threads/singleinstancemfc.asp

2.
http://www.codeproject.com/library/PlgInArchSingInst.asp

3.
http://www.codeproject.com/threads/singleinstance.asp

4.

http://www.codeproject.com/cpp/csingleinst.asp

vinsankar

Re: Limiting an application to single instance...problem?

prasad_som14-Aug-06 0:15

prasad_som

14-Aug-06 0:15

I tried first link only. But cant get second instance.
Can you explain it in detail?

Prasad
Notifier using ATL

Re: Limiting an application to single instance...problem?

Vinod Sankaranarayanan14-Aug-06 1:08

Vinod Sankaranarayanan

14-Aug-06 1:08

Hi ,

How will u get second instance?

those articles tell u abt preventing the second instance from running when there is already one instance running on ur desktop....

ok.........

vinsankar

Re: Limiting an application to single instance...problem?

Milton Karimbekallil14-Aug-06 1:42

Milton Karimbekallil

14-Aug-06 1:42

There are no direct APIs or functions to identify which is second instance or third instance and so on.
Why do u need second instance?
What exactly is the problem u r facing?

If something is crashing in the ExistInstance in the second time, you have to find out which statement is crashing.

It may be because, u r trying to access an un initialized variable there which may get initialized in the first instance as InitInstance will execute completely in the first instance.

But in the second instance you may bypass those initializations and exits after the 'previous instance' checking. Then when control reaches ExitInstance it will crash as what ever u r accessing is not initialized. Just a thought. chk it out.

Cheers..Milton KB.

Re: Limiting an application to single instance...problem?

Vinod Sankaranarayanan14-Aug-06 2:34

Vinod Sankaranarayanan

14-Aug-06 2:34

Hi,

Sorry.......

I don't need the second instance......I want to prevent all other instances while one is there..

then.....

I fix it .....

I made a mistake in the "return statement" after finding the previous instance of that program in the 'InitInstance()' of my App class.

I was written like this...
BOOL CMyApp::InitInstance()
{
if(IsthereApreviousInstance(....GUID))
{
AfxMessageBox("Already one Instance");
return FALSE; // This is wrong
}

}

The above code will work but an exception will raised...

So I put it like this....

exit(0); // in place of "return FALSE"

Ok.............Thanks....to all

vinsankar

Re: Limiting an application to single instance...problem?

Waldermort14-Aug-06 2:10

Waldermort

14-Aug-06 2:10

When the first instance starts execution, the very first thing it should do is check for a mutex, if not found it should create one. When the second instance starts, it should check for the mutex, when it finds it it should terminate.

Look at the CreateMutex() and GetLastError() functions.

I'm not sure where to do this in MFC, but in Win32 these routines are the first to be executed in WinMain(). Also note all of this should be done before creating/reading any other variables.

I have a header file containing all these functions and a few more like handling Command line paramaters, and handling MultiUser/MultiDesktop environments. (A modified combination of CP examples). If you like I will send it to you.

Re: Limiting an application to single instance...problem...solution [modified]

Vinod Sankaranarayanan14-Aug-06 2:36

Vinod Sankaranarayanan

14-Aug-06 2:36

Hi,

I solve it ....
See my previous message....

Thanks....

-- modified at 11:31 Monday 14th August, 2006

vinsankar

Re: Limiting an application to single instance...problem?

prasad_som15-Aug-06 18:49

prasad_som

15-Aug-06 18:49

Vinod A Sankaranarayanan wrote:
How will u get second instance?

that's why I wanted you to explain in detail.
Anyway you solve your problem, and shared,too.Thats good.

Prasad
Notifier using ATL

How to vopy data pointed by a "Void* " pointer to "CString" object

VCSharp00713-Aug-06 23:15

VCSharp007

13-Aug-06 23:15

Hi,
I have to copy the data pointed by "void*" to a CString object.
Which is the best way?

code:

void* pVoid = 0;
CString csData;
pVoid = new BYTE(100);

// Do some thing

// ??? (Here I have to copy data from void* to CString.)
delete[] pVoid;
AfxMessageBox( csData );

Thnx in advance.

Re: How to vopy data pointed by a "Void* " pointer to "CString" object

Waldermort14-Aug-06 1:59

Waldermort

14-Aug-06 1:59

Use a typecast i.e.

csData = (char*)pVoid;

You should probably validate the data in pVoid first, not sure how CString would respond if the data wasn't NULL terminated.

Re: How to vopy data pointed by a "Void* " pointer to "CString" object

ajisthekingofpop14-Aug-06 5:45

ajisthekingofpop

14-Aug-06 5:45

void* pVoid = 0;
CString csData;
pVoid = new BYTE(100);

I would do the following:

memcpy(&csData, pVoid, 100);

//I would use a #define for the 100 tho because it make sit easier to understand

Now this has copied the data from one object to another WITHOUT using a reference.

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