C / C++ / MFC Discussion Boards

How to get IP Address of the system using MFC

PankajB7-May-09 23:29

7-May-09 23:29

Hi there.

I can find the IP address of current system using below code but that's C++ code...

char* CLogger::GetIPAdd()
{
	WORD wVersionRequested;
	WSADATA wsaData;
	char Name[255];
	PHOSTENT HostInfo;
	wVersionRequested = MAKEWORD( 1, 1 );
	char *IPAdd;
	if ( WSAStartup( wVersionRequested, &wsaData ) == 0 )
	{
		if( gethostname ( Name, sizeof(Name)) == 0)
		{
			//printf("Host name: %s\n", name);
			if((HostInfo = gethostbyname(Name)) != NULL)
			{
				int nCount = 0;
				while(HostInfo->h_addr_list[nCount])
				{
					IPAdd = inet_ntoa(*(struct in_addr *)HostInfo->h_addr_list[nCount]);
 
					++nCount;
				}
			}
		}
	}
  return IPAdd;
}

I want to get an IP Address using MFC. Can any one please help me out to get the same using MFC?

Thanks
PanB

Re: How to get IP Address of the system using MFC

_AnsHUMAN_ 7-May-09 23:51

_AnsHUMAN_

7-May-09 23:51

MFC is just a wrapper over C++ classes functions, but what is the problem with the code above.
Even if you do find a class in MFC to get the IP address it must be using a similar sort of mechanism to get the IP Address of the local machine

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: How to get IP Address of the system using MFC

PankajB7-May-09 23:59

PankajB

7-May-09 23:59

Why MFC? I am getting lots of Windows.h already included related error messages.
But if we can get IP Address in MFC then that will server my requirement.

Thanks

Re: How to get IP Address of the system using MFC

_AnsHUMAN_ 8-May-09 0:06

_AnsHUMAN_

8-May-09 0:06

PankajB wrote:
But if we can get IP Address in MFC then that will server my requirement.

do you apply ointment on your feet if you have an headache Smile | :)

PankajB wrote:
I am getting lots of Windows.h already included related error messages.

figure out why these errors are popping and resolve them. May be you are missing a library to link to or you didn't include a header file.
BTW what are the errors?

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: How to get IP Address of the system using MFC

Stuart Dootson8-May-09 0:02

Stuart Dootson

8-May-09 0:02

PankajB wrote:
I can find the IP address of current system using below code but that's C++ code...

PankajB wrote:
I want to get an IP Address using MFC

MFC doesn't have functionality covering IP address resolution - if it works, your C++ code is as good as anything.

Don't get too hung up about things being in MFC or not in MFC - MFC is, for the most part, a thin veneer over Win32 functions and, overall, has a very old fashioned design , a lot of which was constrained by the deficiencies of C++ compilers in use when MFC was developed.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: How to get IP Address of the system using MFC

David Crow8-May-09 3:05

David Crow

8-May-09 3:05

PankajB wrote:
...but that's C++ code...

Nothing in your code is C++.

PankajB wrote:
return IPAdd;

You are potentially returning an uninitialized pointer.

PankajB wrote:
I want to get an IP Address using MFC.

Then use the same code.

PankajB wrote:
Can any one please help me out to get the same using MFC?

MFC offers no such class.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: How to get IP Address of the system using MFC

Esaias Pech13-Aug-09 16:25

Esaias Pech

13-Aug-09 16:25

Thanks for the code! I just had to add the library Ws2_32.lib and the header Windows.h, works perfectly! Thanks!

Re: How to get IP Address of the system using MFC

Bemali12-Jun-10 21:19

Bemali

12-Jun-10 21:19

Yeah it works perfect. Thanks a lot for the code Smile | :)

Problem with BEGIN_MESSAGE_MAP ( subsublcass..,baseClass)

jensreichert7-May-09 22:43

jensreichert

7-May-09 22:43

Hello,

I get compiler error error C2327: 'CMyGridEdit::OnChar' .symbol' : is not a type name, static, or enumerator..
What's wrong at this declaration ?
I have following declaration in VC++ 6.0

<<<mygrid.cpp>>
BEGIN_MESSAGE_MAP(CMyGrid::CMyGridEdit, CEdit)
ON_WM_CHAR()
END_MESSAGE_MAP()

void CMyGrid::CMyGridEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
}
<<mygrid.h>>
{
class CMyGrid : public CMSHFlexGrid
..
class CMyGridEdit : public CEdit
{

afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);
DECLARE_MESSAGE_MAP()
};
};

Thanks for helps. jr

Re: Problem with BEGIN_MESSAGE_MAP ( subsublcass..,baseClass)

Stuart Dootson7-May-09 23:28

Stuart Dootson

7-May-09 23:28

That pattern works fine in VS2008, so the only thing I can presume is that one of the VC6 compiler's many many deficiencies is biting you.

I'd suggest you pre-process the C++ file (with CL /P) and see if anything looks untoward in the BEGIN_MESSAGE_MAP code after pre-processing (don't look for BEGIN_MESSAGE_MAP in the .i file you get out of the pre-processor - it won't be there - look for CMyGrid::CMyGridEdit::GetMessageMap instead.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Problem with != operator of CString

vijith.squadz7-May-09 22:41

vijith.squadz

7-May-09 22:41

The following is the code fragment which I used in my application,

CStringb csFilePath = _T("C:\\MyFolder\\");
if(csFilePath != "\\")
{
DWORD dwError = GetLastError();
}

And i am getting an error code of 122(The data area passed to a system call is too small) in VS2008.
But in VC6.0, there is no such problem, the error code i am getting is 0.The application is with UNICODE supported.

Please help me to find out the cause of this problem. Frown | :(

Thanks & Regards
VIJITH VIJAYAN

Re: Problem with != operator of CString

CPallini7-May-09 23:00

CPallini

7-May-09 23:00

VIJITH VIJAYAN wrote:
if(csFilePath != "\\")

this should probably be

if(csFilePath != _T("\\"))

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Problem with != operator of CString

vijith.squadz7-May-09 23:05

vijith.squadz

7-May-09 23:05

Thanks for the quick response .But at the compilation time this code didnt shown any errors or warnings . Do have any idea ,why it had happened like this ?

Thanks & Regards
VIJITH VIJAYAN

Re: Problem with != operator of CString

CPallini7-May-09 23:28

CPallini

7-May-09 23:28

Because the CStringT == operator is overloaded to handle PCYSTR.

Re: Problem with != operator of CString

David Crow8-May-09 3:12

David Crow

8-May-09 3:12

VIJITH VIJAYAN wrote:
And i am getting an error code of 122(The data area passed to a system call is too small) in VS2008.

Possibly because that's the last value that was set (with SetLastError()). In other words:

SomeWindowsFunctionThatFailsWithCode122();
CString csFilePath = _T("C:\\MyFolder\\");
if (csFilePath != _T("\\"))
{
    DWORD dwError = GetLastError();
}

If nothing calls SetLastError(0), then its internal value will stay 122.

Question on boost weak pointers

minkowski7-May-09 22:35

minkowski

7-May-09 22:35

Hi,

Have a quick question on Boost weak pointers. Hope this is the place to ask. I found the article

Smart Pointers to boost your
code[^]

and on the paragraph "cyclic references" in the code there is the line

<br />
child->myDad = dad;<br />

where does the dad come from? Can't seem to see it defined anywhere in the code.

Thanks for any information.

Re: Question on boost weak pointers

tolw7-May-09 22:56

tolw

7-May-09 22:56

I think it's just a typo. Should be:

child->myDad = parent;

EDIT: You can download the sources just to be certain Smile | :)

Re: Question on boost weak pointers

minkowski7-May-09 23:02

minkowski

7-May-09 23:02

Ha ha, yes I did think it should be parent.

Thanks!

Re: Question on boost weak pointers

minkowski7-May-09 23:23

minkowski

7-May-09 23:23

Actually, if it was a typo then why does the diagram underneath refer to "dad" and the dad.reset() ? Surely that can't be a typo as well?

Re: Question on boost weak pointers

tolw8-May-09 0:10

tolw

8-May-09 0:10

As I said before - you really should download the sources first. The code will probably clear things up Smile | :)

Re: Question on boost weak pointers

Stuart Dootson7-May-09 23:05

Stuart Dootson

7-May-09 23:05

Why not post this message on that article rather than here?

Looking at the article, I think that's a typo - dad should be parent

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Question on boost weak pointers

minkowski7-May-09 23:17

minkowski

7-May-09 23:17

Hmmm, if it was a typo to put "dad" instead of "parent", then is the diagram showing dad pointing to the CDad struct a mistake as well?

Re: Question on boost weak pointers

Stuart Dootson7-May-09 23:32

Stuart Dootson

7-May-09 23:32

He probably used dad and son or boy throughout, then tried to remove the gender specificness as it could be seen as discriminatory? Smile | :)

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Question on boost weak pointers

minkowski7-May-09 23:39

minkowski

7-May-09 23:39

Hmmm, thats confusing! Confused | :confused:

I'll try and email the author (if thats possible) as it is a good article and I want to get my head round it.

Thanks !

Debug Assertion Failed!

susanne17-May-09 21:51

susanne1

7-May-09 21:51

Hallo i have the following prbolem:

i need to modify the CFont Dialog, and by using this
code got the following Error: Debug Assertion Failed!

Hier is the code:

UpdateData(TRUE); // Debug Assertion Failed

LOGFONT lf;

CFont *pFont = GetFont();// Debug Assertion Failed

pFont->GetLogFont(&lf);

...

Any help would be appriciated thanks in advance.

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