C / C++ / MFC Discussion Boards

David Crow19-Apr-04 5:17

19-Apr-04 5:17

Have you tried commenting out a few lines at a time until the "error" goes away? If I remember, the WM_PAINT message is a very frequent message so doing extraneous stuff in its handler is not usually a good idea.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Anything Wrong

Mike Dimmick19-Apr-04 6:10

Mike Dimmick

19-Apr-04 6:10

In this case, 0x80000003 means STATUS_BREAKPOINT, the exception that Windows raises when it hits an int 3 instruction (on x86). The debugger normally intercepts this exception and stops the program's execution, showing you where it stopped.

If you're getting an unexpected breakpoint, you may have jumped to an incorrect address, or you may have corrupted your heap, or caused one of your other DLLs to ASSERT. The Windows heap code will cause a breakpoint exception if it detects that the program is running under a debugger and has corrupted the heap.

It might be useful to get the OS debugging symbols to determine whether you've landed in a system function. If you're using Visual Studio .NET (2002 or 2003), you can use Microsoft's Symbol Server to download debugging symbols on demand - this is the preferred option. See http://support.microsoft.com/default.aspx?scid=kb;en-us;319037[^] for more information.

Visual Studio 6 can't use the symbol server, so you can try the Debugging Symbols Packages[^], which are a complete set of symbols for a particular OS. However, these are only updated with every service pack; you may well find that the debugger won't load some of them because they don't match the installed binaries (due to security patches and other hotfixes). You could also try using the Windows Debugging Tools[^], although these are a lot harder to use.

Stability. What an interesting concept. -- Chris Maunder

Re: Anything Wrong

monrobot1319-Apr-04 16:06

monrobot13

19-Apr-04 16:06

Thanks for the reply Mike. Well the program is breaking on an int 3 instruction. I don't really know how I could have jumped to an incorrect address or corrupted the heap with the code I have though. I downloaded the symbols, but I'm not sure if there's something I have to do to use them. I ran the program again and it broke on assembly code again. The VC debugger shows that it broke in NTDLL. Any ideas? Thanks for the help. I don't know that much about hardcore debugging so I'm kind of at a loss. Thanks again Mike.

I was just checking some other things. After the program terminates there's a line in the output box that says "Second Chance Assertion Faild" and then gives the file. What's a "second chance assertion"? Thanks.

- Aaron

Re: Anything Wrong

Mike Dimmick20-Apr-04 8:37

Mike Dimmick

20-Apr-04 8:37

I forgot to mention that you need to set _NT_SYMBOL_PATH to tell the debugger where to find the OS symbols. It still may not do any good because

At a guess, I think you've ended up at ntdll!DbgBreakPoint, an internal function in NTDLL - a piece of the OS code has explicitly called the break-point function. I still think this may be heap related.

I've found an article http://www.codeproject.com/debug/cdbntsd3.asp[^] which may be helpful.

Stability. What an interesting concept. -- Chris Maunder

Re: Anything Wrong

monrobot1322-Apr-04 6:31

monrobot13

22-Apr-04 6:31

Thanks again for the help Mike. Read the link and it was informative, but out of my depth. I'll take a harder look at my code though to see if it looks like I'm corrupting the heap anywhere. Thanks again for all the help.

- Aaron

DNS to IP

Irish_GUI19-Apr-04 3:41

Irish_GUI

19-Apr-04 3:41

Hi,
can someone please give me an example of how to
translate a domain name eg. www.codeproject.com

into its IP address.

i have this working for network machine names but
not for domain names.

preferably into CString or unsigned long format.

Thanks

Re: DNS to IP

monrobot1319-Apr-04 4:12

monrobot13

19-Apr-04 4:12

You could try looking at gethostbyname.

- Aaron

Re: DNS to IP

Irish_GUI19-Apr-04 4:47

Irish_GUI

19-Apr-04 4:47

Aaron
i cannot get that to work..

GetHostAddress("http://www.coderproject.com");

unsigned long DialogClass::GetHostAddress(LPCSTR host)
{
struct hostent *phe;
char *p;

phe = gethostbyname(host);

p = *phe->h_addr_list; // Crash here
return *((unsigned long*)p);
}

any ideas ?

Re: DNS to IP

monrobot1319-Apr-04 5:05

monrobot13

19-Apr-04 5:05

Try changing:

p = *phe->h_addr_list;

p = *phe->h_addr;

- Aaron

Re: DNS to IP

RobJones19-Apr-04 5:08

RobJones

19-Apr-04 5:08

Didn't compile it so it may have type-o's...

// Name resolution
struct hostent *hp;
unsigned int addr;
struct sockaddr_in name_ip;
 
// Make sure that strDns is not already an IP Address.	
if(inet_addr(strDns) == INADDR_NONE)
	hp = gethostbyname(strDns);
else
{
	addr = inet_addr(strDns);
	hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET);
}
 
if(hp == NULL)
{
	// Handle the error here..
}
 	
name_ip.sin_addr.s_addr = *((unsigned long*)hp->h_addr);
name_ip.sin_family = AF_INET;
name_ip.sin_port = htons(iPort);
 
// Assign strSocketIP to the IP address...
CString strSocketIP = inet_ntoa(name_ip.sin_addr);

Rob

Whoever said nothing's impossible never tried slamming a revolving door!

Re: DNS to IP

Irish_GUI19-Apr-04 9:36

Irish_GUI

19-Apr-04 9:36

Rob,
thanks for that
but
in flow of execution

strDns = "www.codeproject.com";

hp = gethostbyname(strDns); executes fine

name_ip.sin_addr.s_addr = *((unsigned long*)hp->h_addr); // crash occurs
name_ip.sin_family = AF_INET;
name_ip.sin_port = htons(iPort);

any ideas?

Re: DNS to IP

Irish_GUI19-Apr-04 9:39

Irish_GUI

19-Apr-04 9:39

i am using winsock 1.1
if that might be a problem

in the struct hostent *hp;

i only have the following members:

hp->h_addr_list
hp->h_addrtype
hp->h_aliases
hp->h_length
hp->h_name

i do not have a hp->h_addr member

Re: DNS to IP

RobJones19-Apr-04 10:24

RobJones

19-Apr-04 10:24

I'm not 100% sure, I have only had experence in WinSock2.. you may lookup gethostbyname in google or msdn and see if you can find any Winsock 1.1 examples.. you could snoop through the articles here too.. I'm sure it can't be too hard.

If you still have problems let me konw and I'll see what I can find.

Rob

Whoever said nothing's impossible never tried slamming a revolving door!

Re: DNS to IP

RobJones19-Apr-04 10:27

RobJones

19-Apr-04 10:27

I just did a google search and found this right off the bat...

The macro h_addr is defined to be h_addr_list[0] for compatibility with older software.

Rob

Whoever said nothing's impossible never tried slamming a revolving door!

CTreeCtrl question ( image )

Maximilien19-Apr-04 3:24

Maximilien

19-Apr-04 3:24

I have a tree control inserted, in which I assigned an imagelist.

When I insert some items, some of them have images assigned to them, even if I don't assign one to them.

This is how I insert my Item in the tree :

TVINSERTSTRUCT tv;
tv.hParent = m_hRootItem;
tv.hInsertAfter = TVI_SORT;
tv.item.mask = TVIF_TEXT | TVIF_PARAM;
CString sText;
sText.LoadString ( IDS_OBJECT_CONSTRUCTED );
tv.item.pszText = (LPTSTR)(LPCTSTR)sText;    

tv.item.lParam = NULL;

m_hMyItem = InsertItem( &tv );

but this item use the an image ( index 0 ) from the image list, even if the item does not have the TVIF_IMAGE and TVIF_SELECTEDIMAGE ...

any insights ?

Thanks.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: CTreeCtrl question ( image )

Ravi Bhavnani19-Apr-04 3:48

Ravi Bhavnani

19-Apr-04 3:48

Try fully initializing tv by doing this:

TVINSERTSTRUCT tv;
ZeroMemory (&tv, sizeof (tv));
...

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Re: CTreeCtrl question ( image )

Maximilien19-Apr-04 5:26

Maximilien

19-Apr-04 5:26

Thanks, I always forget about that, but, it doesn't seem to do anything special, the item will use the first image in the image list; maybe the tree doesn't like to have items with images and items without.

anyway, I created an "empty" image in the imagelist for those items .

Thanks!

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: CTreeCtrl question ( image )

Ravi Bhavnani19-Apr-04 7:19

Ravi Bhavnani

19-Apr-04 7:19

Hi Maximilien, when your tree control has an associated image list (as your does), you need to specify -1 for the image index of items that aren't supposed to show an image.

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Re: CTreeCtrl question ( image )

Maximilien19-Apr-04 7:44

Maximilien

19-Apr-04 7:44

Thanks !!

Maximilien Lincourt
Your Head A Splode - Strong Bad

Message map problem?

BlackDice19-Apr-04 3:24

BlackDice

19-Apr-04 3:24

during execution of the debug build of my .exe I keep getting this in the debug window ( a lot of them):

Warning: no message line prompt for ID 0x800B.

I removed some edit boxes from my dialog, but I also deleted the message map entries for these controls and their variables. Does anyone know what this might be, or how I can find out? Thanks in advance!!!

If it's broken, I probably did it

bdiamond

Re: Message map problem?

Antony M Kancidrowski19-Apr-04 3:45

Antony M Kancidrowski

19-Apr-04 3:45

It is likely that you have missed the prompt for menu item(s) that you have added (in the resource editor).

These prompts show in the status bar at the bottom of the application when you hover over the menu item(s).

Note: Toolbar items will have the same prompt as their corresponding menu items.

Ant.

Re: Message map problem?

toxcct19-Apr-04 4:29

toxcct

19-Apr-04 4:29

and how do we do to display such promt in the status bar ?
(i know, get the string into the string table, then write it in the correct statusBar Pane...)
But how, could you give me some short code lines (mt problem is more to get smth in the string table actually)
thanks

TOXCCT >>> GEII power

Re: Message map problem?

jmkhael19-Apr-04 5:42

jmkhael

19-Apr-04 5:42

CString::LoadString
Be sure that resource exist in the string table

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Message map problem?

BlackDice19-Apr-04 4:36

BlackDice

19-Apr-04 4:36

thanks! that helped a lot!!

If it's broken, I probably did it

bdiamond

How can i modify the net-data packets ahead of the applications?

Hendy_So19-Apr-04 3:05

Hendy_So

19-Apr-04 3:05

I want to modify the net-data pacekts before they are passed to the applications. can raw socket or winpcap do?
someone said that SPI can do. but it is only for winsock 2. i hope it also work for the lower version winsock such as winsock 1.1.

Thanks.

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