C / C++ / MFC Discussion Boards

Ryan Binns21-Jun-04 18:34

21-Jun-04 18:34

NTense wrote:
//DECLARE_DYNCREATE(CMotionXModelView);

Uncomment this in your derived class, and add IMPLEMENT_DYNCREATE(CMotionXModelView, CMotionXGLView) in your .cpp file

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Obtainining parent process' handle

Anonymous21-Jun-04 6:06

Anonymous

21-Jun-04 6:06

Hi there!

Is there a way to obtain the parent process' handle using Win32 APIs?

One obvious way is to pipe the handle obtained by GetCurrentProcess() to the child process. But, I wanted to know if there's a direct way.

Thanks for your help!

Regards,
Sachin

Re: Obtainining parent process' handle

David Crow21-Jun-04 6:49

David Crow

21-Jun-04 6:49

Anonymous wrote:
Is there a way to obtain the parent process' handle using Win32 APIs?

Have you see the PROCESSENTRY32 structure, specifically the th32ParentProcessID member?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

VC++ and VB

Neelesh K J Jain21-Jun-04 5:40

Neelesh K J Jain

21-Jun-04 5:40

Hello friends,
I had attend some interviews in recent time and faced one common question.
"When a database application can be developed using VB, then whats the advantage for using VC++ for that same application?"

Please tell me the advantage so that I can easily answer if the same question is asked
Thank you,

Re: VC++ and VB

Maximilien21-Jun-04 5:59

Maximilien

21-Jun-04 5:59

none.

except maybe if there's some sort of cross-platform compatibility needed on the front end.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: VC++ and VB

Andrew Quinn AUS21-Jun-04 6:10

Andrew Quinn AUS

21-Jun-04 6:10

There's multi-threading of course.

VC++ clients can be made more UI responsive esp. if talking about large recordsets. Clever usage can help alleviate the annoying UI stalls.

Conversely, VC++ is much more costly to develop than VB (generally)

Cheers,
Andy

Re: VC++ and VB

David Crow21-Jun-04 6:36

David Crow

21-Jun-04 6:36

Neelesh K J Jain wrote:
"When a database application can be developed using VB, then whats the advantage for using VC++ for that same application?"

If the person doing the developing is more fluent in VC++, it will probably result in less cost, and quicker turn-around time.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: VC++ and VB

Kevin McFarlane21-Jun-04 8:23

Kevin McFarlane

21-Jun-04 8:23

Generally speaking, database access is far easier in VB than in VC++. Technologies such as ADO were built with ease-of-use for VB rather than C++.

Kevin

Re: VC++ and VB

palbano21-Jun-04 8:53

palbano

21-Jun-04 8:53

Neelesh K J Jain wrote:
whats the advantage for using VC++ for that same application?"

"whats THE advantage"?

There is no single advantage there are any number of them. Perhaps the most important would be that you were NOT developing in VB. Big Grin | :-D

"for that same application"?

What are the rest of the requirements for the application?

I would seriously doubt the technical merit in that question and suspect a purely bias hidden agenda behind it. If that question is aimed at a technical issue that it is very poorly framed. It's as though the asker is expecting you to be thinking the same way he is. I find that to be an inappropriate question at best.

But, that's just my opinion... I could be wrong.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

How to detect if you are connected to internet?

kfaday21-Jun-04 4:14

kfaday

21-Jun-04 4:14

Hi,
i'm creating a jabber client (a chat tool, like icq or msn). In the app, i send info to a server, and i receive from it. I use MFC CSocket.
Is there any api function that checks if you are connected to internet?

thanks!!!

Re: How to detect if you are connected to internet?

22491721-Jun-04 5:14

224917

21-Jun-04 5:14

InternetGetConnectedState

It's not a bug, it's an undocumented feature.
suhredayan@omniquad.com

messenger :suhredayan@hotmail.com

Re: How to detect if you are connected to internet?

kfaday21-Jun-04 5:35

kfaday

21-Jun-04 5:35

thanks!

i looked it up in msdn ( http://msdn.microsoft.com/library/?url=/library/en-us/wininet/wininet/internetgetconnectedstate.asp) , and i don't understand the following:

lpdwFlags
[out] Pointer to a variable that receives the connection description. This parameter can be one or more of the following values.
Value Meaning
INTERNET_CONNECTION_CONFIGURED Local system has a valid connection to the Internet, but it might or might not be currently connected.
INTERNET_CONNECTION_LAN Local system uses a local area network to connect to the Internet.
INTERNET_CONNECTION_MODEM Local system uses a modem to connect to the Internet.
INTERNET_CONNECTION_MODEM_BUSY No longer used.
INTERNET_CONNECTION_OFFLINE Local system is in offline mode.
INTERNET_CONNECTION_PROXY Local system uses a proxy server to connect to the Internet.
INTERNET_RAS_INSTALLED Local system has RAS installed.

the following code always returns online.. any ideas?

unsigned long *a;
a=(unsigned long *)malloc(sizeof(unsigned long));
if (TRUE==InternetGetConnectedState(a,0))
    AfxMessageBox("online");
else
    AfxMessageBox("offline");

Re: How to detect if you are connected to internet?

David Crow21-Jun-04 6:44

David Crow

21-Jun-04 6:44

kfaday wrote:
I use MFC CSocket.

Over CAsyncSocket? Why?

kfaday wrote:
Is there any api function that checks if you are connected to internet?

See here.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: How to detect if you are connected to internet?

vcplusplus21-Jun-04 7:34

vcplusplus

21-Jun-04 7:34

Check out this article
http://tangentsoft.net/wskfaq/articles/csocket.html

Re: How to detect if you are connected to internet?

David Crow21-Jun-04 8:28

David Crow

21-Jun-04 8:28

And your point is? I'm aware of the downfalls of using CSocket, some of which aren't even mentioned in your article, but perhaps the OP is not.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: How to detect if you are connected to internet?

Michael Dunn21-Jun-04 16:57

Michael Dunn

21-Jun-04 16:57

See the FAQ
8.7 How do I tell if the computer is connected to the Internet?[^]

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
"Just because the box has 2 gigabytes of memory doesn't mean you get to use it all!"
-- Rico Mariani, CLR perf guy

Re: How to detect if you are connected to internet?

palbano21-Jun-04 17:24

palbano

21-Jun-04 17:24

You know what would be great is if you could search for stuff on the internet instead of waiting for some nice person like you to provide a link to the page(s) of interest. OMG | :OMG:

But, that's just my opinion... I could be wrong.

Re: How to detect if you are connected to internet?

kfaday22-Jun-04 2:04

kfaday

22-Jun-04 2:04

thanks for the link to the faq

#include <Wininet.h>
.
.
.

BOOL bConnected;
DWORD dwFlags;
 
  bConnected = InternetGetConnectedState ( &dwFlags, 0 );
 
  if ( bConnected )
    if ( dwFlags & INTERNET_CONNECTION_OFFLINE )
      bConnected = FALSE;

i get this error:
error C2065: 'INTERNET_CONNECTION_OFFLINE' : undeclared identifier

any ideas?
thanks!

SetWorldTransform()/SetGraphicsMode() bug in printing?

CodeHead21-Jun-04 4:01

CodeHead

21-Jun-04 4:01

I have an application that produces a calibrated tape. I am tying to impliment the ability to print this in mirror image as well. I call

<br />
void CTransformView::OnDraw(CDC* pDC)<br />
{<br />
  pDC->SetMapMode(MM_LOENGLISH);<br />
  SetGraphicsMode(pDC->GetSafeHdc(), GM_ADVANCED);<br />
  SetWorldTransform(pDC->m_hDC, &XForm);<br />
  ...<br />
  ...<br />
}<br />

with XFORM structure filled out appropriately, and on screen everything is fine, however, with print and print previews, all text is simply rendered upsite down, not mirrored! In fact, simply creating a dummy application that does nothing but print a line of text to screen and draws a single line under it exhibits the same behavior if you make the call to SetGraphicsMode, (without any transform call). You will see your line of text as normal on screen with your line under it, but printing and print previews will show the line under your text printed upside-down. Has anybody come across this bug and found a work-around, or am I missing something? Sheesh, will these MS bugs never cease?
TIA Eric

cbt hook for avoid title bar in all windows

Oscarin21-Jun-04 3:56

Oscarin

21-Jun-04 3:56

hello, I'm interesting in delete the title bar of all windows (title, button minimice, button maximize,...,all thing). I`ve proven with diferent option, trying with case HCBT_CREATEWND OR HCBT_ACTIVATE but i can´t achive it. At the moment only I´ve achived that the hook CBT work´s.

Please can anyone help me?

Sorry for my english.

Re: cbt hook for avoid title bar in all windows

gamitech22-Jun-04 13:31

gamitech

22-Jun-04 13:31

check my firewall done with the CBT function hope it will help you.

gabby

Need a little help guys

mayanxn0321-Jun-04 3:56

mayanxn03

21-Jun-04 3:56

unsigned int GetOtherOffset( int index ) {<br />
	byte array[8];<br />
	unsigned long otherAddress;<br />
	if ( ReadProcessMemory( g_hCurrentProcess, (void *) (g_uiOtherBaseOffset), (void *) array, 8, NULL ) ) {<br />
		otherAddress = GetUnsignedLong( array );<br />
<br />
		if ( ReadProcessMemory( g_hCurrentProcess, (void *) (otherAddress + 152416 + (index * 480)), (void *) array, 8, NULL ) ) {<br />
			return GetUnsignedLong( array );<br />
		}<br />
	}<br />
	return -1;<br />
}

I understand that in the first part, ReadProcessMemory gets the value from g_uiOtherBaseOffset and stores it as an Unsigned Long Labled "otheraddress".

What I have trouble understanding is the second part...this part.

if ( ReadProcessMemory( g_hCurrentProcess, (void *) (otherAddress + 152416 + (index * 480)), (void *) array, 8, NULL ) ) {<br />
			return GetUnsignedLong( array );

So, it takes the value from 'otheraddress' and adds it to 152416.....then what? Where does the 'index' part come from? And why is it multiplied by 480?

Re: Need a little help guys

Johnny ²21-Jun-04 4:53

Johnny ²

21-Jun-04 4:53

'index' is the parameter passed into the GetOtherOffset function

unsigned int GetOtherOffset( int index )

I don't know why 152416 is being added to it, nor why index is multiplied by 480. That all seems very horribly hacky. What is the function used for? Maybe that will provide clues

Disable Special key's

Larsson21-Jun-04 3:47

Larsson

21-Jun-04 3:47

Hi,
I need to disable some special key's.

CTRL+ESC
CTRL+ALT+DEL

That I want to do is disable this key's so you don't be able to open explorer, or the task managen.
Is there anyone how can help me with this?.
PS: I want to use it in a MFC App.

Re: Disable Special key's

V.21-Jun-04 5:11

21-Jun-04 5:11

maybe you can override them?
assign some action (like donothing or something) to it.

don't know how by heart.

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

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