C / C++ / MFC

10-Sep-07 2:40

I've learned much from this article. But now I got some problem.

How to get client's IP address when it act as a server?

Thanks in advance.

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C++ Learner

baerten10-Sep-07 2:48

10-Sep-07 2:48

Hi,

i made it this way :

SOCKADDR_IN ClientAddress;
int adrlen = sizeof(ClientAddress);

accept(ListenSocket,(LPSOCKADDR)&ClientAddress,&adrlen);

then you get the String of the Client's IP Adresse this way:

inet_ntoa(ClientAddress.sin_addr)

I hope this helps you Smile | :)

maglev_tgv10-Sep-07 3:14

10-Sep-07 3:14

Thanks for your assistance.
I added those lines to my project.
But, when I build the project, there was an error :
error C2065: 'ListenSocket' : undeclared identifier
So I added this line :
SOCKET ListenSocket;
Then I build it again, although I got some warning :
warning C4700: uninitialized local variable 'ListenSocket' used
there was no error.
Then I debug, try to connect from other computer.
It was connected, could read the buffer, but my program shows "0.0.0.0" as client's IP address.

Any suggestion?

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C++ Learner

baerten10-Sep-07 3:20

10-Sep-07 3:20

Ok,

so you have used the CodeProject offered classes "Java-like-Sockets" without
knowing how it works.

The ListenSocket is a part of the source code that you need to etablish a connection.

You need to look into the SourceCode of the "Java-like-Sockets" Classes and check where
the accept(...) is performed. There you can add the line inet_ntoa(...); to get the Clients-IP-Address

If you have questions: i'll look here Wink | ;)

Good luck

maglev_tgv10-Sep-07 4:15

10-Sep-07 4:15

You guess it right. Smile | :)

I've just begin Socket Programming, understand nothing about socket programming, but I found that the article about "Java Style Socket Programming in C++" is easy to use. By just change the example program a bit, I could communicate between two computers.

Anyway, I've tried to find the "Java-like-Sockets",
change something in main source,
but still doesn't work. Frown | :(

I'll try again to understand the source anyway Smile | :)

Thanks for your answers.

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C++ Learner

baerten10-Sep-07 4:24

10-Sep-07 4:24

In sock.cpp you have the following lines :

    SOCKET theClient;
SOCKADDR_IN clientAddr;
int ssz = sizeof(struct sockaddr);
theClient = accept(m_socket,(LPSOCKADDR)&clientAddr,&ssz);
//theClient = accept(m_socket,NULL,NULL);
if (theClient == INVALID_SOCKET) {
    int nret = WSAGetLastError();
    throw CSocketException(nret, "Invalid client socket: Accept()");
}
CSocket *sockClient = new CSocket();
sockClient->SetSocket(theClient);
sockClient->SetClientAddr(clientAddr);

m_socket is the socket which listens on the given Port. So m_socket is a ListenSocket

theClient is also a Socket which will store an Incomming-Connection from a Client.
clientAddr is a structure which will be filled with information during the accept()-function.

After accept was executing, you have the IP and Port into this strucure.

At the end you see that clientAddr is stored inside the class, so you can access from out
your source code, to the CServerSocket class and get the Client-Information-Structure.

You get the IP in plain text with

char TheClientIP[16]="";
strcpy(TheClientIP,inet_ntoa(...->sin_addr));

Good luck

maglev_tgv10-Sep-07 5:09

Re: Java Style Socket Programming in C++ [modified]

10-Sep-07 5:09

Your response is always so fast.

I really appreciated your explanation about the source.
It's really easy to understand.
I think I got what it mean now.

But still doesn't know what is inside (...->sin_addr).
because m_clientAddr is an private object,
so I can't access it.

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C++ Learner

maglev_tgv10-Sep-07 5:38

10-Sep-07 5:38

I solved it, thanks to your assistance.
Your answers really help me.

In main function, I added these lines :

CSocketAddress *addrs = sock->GetAddress();
ClientAddress = addrs->GetSockAddrIn();
buffer2 = inet_ntoa(ClientAddress.sin_addr);

Thanks again for your assistance.

-- modified at 12:15 Monday 10th September, 2007

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C++ Learner

baerten11-Sep-07 4:08

11-Sep-07 4:08

Correct!

No problem for helping, i very glad that the hole CodeProject-Crew helps me with my problems LOL
Without the help of some guys here, i would be no more at my job Roll eyes | :rolleyes:

Writing a .html file

neha.agarwal2710-Sep-07 2:22

neha.agarwal27

10-Sep-07 2:22

Hi all,

Actually i want to write a html file or .html page and i don't know how to do it using MFC. I know how to write a .txt file using CStdioFile class and using WriteString API's. Can any body tell me how to do it.

Thanks in advance

Re: Writing a .html file

Paresh Chitte10-Sep-07 2:38

Paresh Chitte

10-Sep-07 2:38

1. You must know the HTML tags.
2. While saving the file just specify the extension as .htm / .html.

And you are done with writing an .html file.

Regards,
Paresh.

Re: Writing a .html file

Russell^'10-Sep-07 2:39

Russell^'

10-Sep-07 2:39

It is the same. D'Oh! | :doh:

Simply save tha text file as htm (or html) instead txt, then you can open it with a browser.
If you need an example you can look to the source on this page, or surely you can find more simple examples in the net.

Of course, first you need to learn HTML (in the web there are a lot of free manual) Poke tongue | ;-P

Russell

file search problem

david bagaturia10-Sep-07 1:38

david bagaturia

10-Sep-07 1:38

Hi all

I ahev problem, I have code:

<br />
HANDLE  hSearch = INVALID_HANDLE_VALUE; <br />
WIN32_FIND_DATA FileData; <br />
<br />
// .....................<br />
<br />
if(hSearch == INVALID_HANDLE_VALUE)		  <br />
  	 hSearch = FindFirstFile("C:\\Myfolder\\Fi*",&FileData);	// problem point<br />
else<br />
	 FindNextFileA(Search,&FileData);<br />
<br />

when program go to "problem point" I get error message: NTDLL.dll

Cedric Moonen10-Sep-07 1:59

Cedric Moonen

10-Sep-07 1:59

david bagaturia wrote:
when program go to "problem point" I get error message: NTDLL.dll

NTDLL.dll ? That's a very descriptive error message Unsure | :~

If you want some help, you have to provide at least some bit of usefull information. So, what happens exactly ? What does this message say exactly ?

Cédric Moonen
Software developer

Charting control [v1.2]

david bagaturia10-Sep-07 3:51

david bagaturia

10-Sep-07 3:51

I get this error: unhandled exception in cpy_file.exe (KERNEL32.dll):
0xE06D7363: Microsoft C++ Exception.

Cedric Moonen10-Sep-07 4:34

Cedric Moonen

10-Sep-07 4:34

Use your debugger to inspect the variables and see exactly what happens.

Cédric Moonen
Software developer

Charting control [v1.2]

david bagaturia10-Sep-07 19:37

david bagaturia

10-Sep-07 19:37

My windows have some problems.
I restart My PC and now this code works good.

thanks for help.

Font & BkColor

josip cagalj10-Sep-07 1:16

josip cagalj

10-Sep-07 1:16

Hi, I have two question.
First is how I can set bigger font to my list control, i get the font using
CFont* myFont = my_List.GetFont();, can I use this font to enlarge it and than set it back?
And the second question is how to set background color to an a dialog?
Thanks!

Nishad S10-Sep-07 1:31

Nishad S

10-Sep-07 1:31

josip cagalj wrote:
how I can set bigger font to my list control,

You can create font object (member variable) and use SetFont() API of ListCtrl

josip cagalj wrote:
how to set background color to an a dialog

Map the WM_CTLCOLOR and write,

HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
if( nCtlColor == CTLCOLOR_DLG )
{
hbr = (HBRUSH) GetStockObject( BLACK_BRUSH ); // or m_brushDlg.GetSafeHandle();
}
return hbr;

- NS -

josip cagalj10-Sep-07 1:55

josip cagalj

10-Sep-07 1:55

Thanks for replay.
I do this:

<br />
CDC *pDC=GetDC();<br />
CFont VelikiFont;<br />
int nHeight;<br />
nHeight = -MulDiv(10, pDC->GetDeviceCaps(LOGPIXELSY), 72);<br />
VelikiFont.CreateFont(<br />
	nHeight,	// logical height of font <br />
	0,		// logical average character width <br />
	0,		// angle of escapement <br />
	0,		// base-line orientation angle <br />
	FW_BOLD,	// font weight <br />
	FALSE,		// italic attribute flag <br />
	FALSE,		// underline attribute flag <br />
	FALSE,		// strikeout attribute flag <br />
	DEFAULT_CHARSET,// character set identifier <br />
	OUT_DEFAULT_PRECIS,	// output precision <br />
	CLIP_DEFAULT_PRECIS,	// clipping precision <br />
	PROOF_QUALITY,		// output quality <br />
	FIXED_PITCH | FF_MODERN,// pitch and family <br />
	"Courier New"		// pointer to typeface name string <br />
	);<br />
<br />
ReleaseDC(pDC);<br />
m_List.SetFont(&VelikiFont);

But I dont get what I wont. When I change 'nHeight' parameter I don't get bigger font, but more space between rows!

Regarding background color Can I set the color (like RGB value or something) instead of choosing type of stock object!
Once again thanks for replaying!

Nishad S10-Sep-07 2:09

Nishad S

10-Sep-07 2:09

josip cagalj wrote:
CFont VelikiFont;

Font object should be member or global. That is it should not be local.

josip cagalj wrote:
Regarding background color Can I set the color (like RGB value or something) instead of choosing type of stock object!

In my sample I have placed a comment regarding this.

You have to keep a brush as member or global.

- NS -