Re: Usage of bind() - C / C++ / MFC Discussion Boards

Re: Visual Studio 2005 Beta 2

Mark Salsbery1-Nov-07 6:52

1-Nov-07 6:52

I'm curious why your using the beta... and where the heck did you find it?

I mean, VS 2008 is past beta at this point Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Visual Studio 2005 Beta 2

Larry Mills Sr1-Nov-07 10:52

Larry Mills Sr

1-Nov-07 10:52

Here's the address:
<a href="http://msdn2.microsoft.com/en-us/evalcenter/bb655864.aspx">http://msdn2.microsoft.com/en-us/evalcenter/bb655864.aspx</a>[<a href="http://msdn2.microsoft.com/en-us/evalcenter/bb655864.aspx" target="_blank" title="New Window">^</a>]

A C++ programming language novice, but striving to learn

Re: Visual Studio 2005 Beta 2

Mark Salsbery1-Nov-07 11:11

Mark Salsbery

1-Nov-07 11:11

Larry Mills Sr wrote:
http://msdn2.microsoft.com/en-us/evalcenter/bb655864.aspx

Ohhh, that's 2008 Smile | :)

Makes much more sense!

I've been using the VS 2008 release candidate for a couple weeks
for full time C++ development.

BTW, here's a CLR Wiki[^]

Starting with Visual Studio .NET 2002, C++ code can be compiled to CLR
code which allows access to the .NET framework.

Cheers,
Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Visual Studio 2005 Beta 2

jp-mocs1-Nov-07 7:20

jp-mocs

1-Nov-07 7:20

Glad I'm not the only one thrown by the new interface... I have both installed on my machine. I'm writing a console app right now, so the lack of the neat painter isn't as much of a big deal, but I kept VS 6 in case I want to do that, then I can just bring the app into VS 2005 to do the deep stuff... that's the idea anyway, haven't actually done it yet. Any 'windows' stuff I need to do keeps getting done in VS 6.

Anyone checked out VS 2008 yet to see how they do it?

=->Mocs<-=

Re: Visual Studio 2005 Beta 2

Larry Mills Sr1-Nov-07 8:12

Larry Mills Sr

1-Nov-07 8:12

I don't know where to begin!!!!
I openned what I suppose is a projects dialog and it ask for what type (ie, "CLR" .... "General", etc.) I have no idea what it is asking for. Why can't they keep things simple like VS 6.0?
I loaded a previously written sample from MSDN(6.0) and it immediately didn't know any of the "Stdarg.h" headers.
I just don't see where it is at all comparable to VS 6.0.

A C++ programming language novice, but striving to learn

Creating a email server [modified]

bigdenny20031-Oct-07 12:24

bigdenny200

31-Oct-07 12:24

Hey all,

I wanted to create an SMTP email server in C++. Do you have any recommendations
for nice classes that would help me achieve this ? Or any tutorials ?

Thanks !

-- modified at 5:12 Thursday 1st November, 2007

Usage of bind()

dellthinker31-Oct-07 10:17

dellthinker

31-Oct-07 10:17

Hi all. I have a project that requires me to call bind() for Windows to bind with an address. I went here: http://msdn2.microsoft.com/en-us/library/ms737550.aspx to find out how its used but im a bit confused. It says i need sockaddr() in order to bind. Is that correct? Can someone show me what to do here because im lost. It would be nice if i could see some example code with the bind() function in it. Thanx in advance!

Re: Usage of bind()

JudyL_MD31-Oct-07 10:28

JudyL_MD

31-Oct-07 10:28

dellthinker wrote:
some example code with the bind() function in it.

Here you go:

hostent *     localHost;
char *        localIP;
SOCKADDR_IN   localAddress;

m_hSocket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (m_hSocket == INVALID_SOCKET)
{
    return false;
}

// build our address
memset (&localAddress, 0, sizeof (SOCKADDR_IN));

localHost = gethostbyname ("");
localIP   = inet_ntoa (*((struct in_addr *) *(localHost->h_addr_list)));

localAddress.sin_addr.s_addr = inet_addr (localIP);
localAddress.sin_family      = AF_INET;
localAddress.sin_port        = htons (usPort);

// bind to it
if (bind (m_hSocket, (SOCKADDR *) &localAddress, sizeof (SOCKADDR_IN)) == SOCKET_ERROR)
{
    closesocket (m_hSocket);
    m_hSocket = INVALID_SOCKET;
    return false;
}

// finally, listen on it
if (listen (m_hSocket, SOMAXCONN) == SOCKET_ERROR)
{
    closesocket (m_hSocket);
    m_hSocket = INVALID_SOCKET;
    return false;
}

usPort is a variable that indicates the TCP port number this socket is bound to

Judy

Re: Usage of bind()

Mark Salsbery31-Oct-07 10:43

Mark Salsbery

31-Oct-07 10:43

In addition to Judy's excellent reply....

A sockaddr is a generic structure since sockets can be used on
any protocol, not just IP protocols.

Therefore, for IP(4) protocols, a sockaddr_in (socket address internet) structure is used
since it specifically defines a complete IP address.

You can also bind to the address INADDR_ANY if you want to let WinSock pick the adapter
to bind to:

localAddress.sin_addr.s_addr = INADDR_ANY;

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Usage of bind()

JudyL_MD1-Nov-07 2:50

JudyL_MD

1-Nov-07 2:50

Mark Salsbery wrote:
In addition to Judy's excellent reply....

How to use this template with varying sizes? [modified]

Devinder31-Oct-07 9:44

Devinder

31-Oct-07 9:44

I have added <> to the code. My compare function works. I want to ask how to set up the input parameters for compare functions, so that Compare works on 2 different sizes.
-- modified at 12:32 Thursday 1st November, 2007

The following is small sample of the template code I am using.

template <unsigned char sz> class MyStringBase<br />
{<br />
	protected:<br />
		unsigned char Len;<br />
		char Data[sz];<br />
};<br />
<br />
template <unsigned char sz> class MyString : MyStringBase<sz><br />
{<br />
	public:<br />
		MyString () { Len = 0; Data[Len] = 0}<br />
		MyString (const char* src);<br />
		bool Compare(MyString??? rhs, int len);<br />
};<br />
<br />
template<unsigned char sz> MyString <sz>::MyString (const char* src)<br />
{<br />
   long len = strlen(src);<br />
   Len = (unsigned char)((len > sz)? sz: len);<br />
   strncpy(Data, src, Len);<br />
}<br />
<br />
template<unsigned char sz> bool MyString <sz>::Compare(MyString??? rhs, int len)<br />
{<br />
	if (len<0)<br />
		len = Len;<br />
	return ((Len==rhs.Len) && (Len<=len) && (strncmp(Data,rhs.Data,len)==0));<br />
}

Compare function has MyString??? which I need to get filled in so I can do the following

MyString<40> a("Test String 1");<br />
MyString<80> b("Testing of String 2 is good") ;<br />
<br />
bool same4 = a.Compare(b,4);

Thank you for your response.

Re: How to use this template with varying sizes?

Stephen Hewitt31-Oct-07 19:45

Stephen Hewitt

31-Oct-07 19:45

Please edit your post so that all "<" and ">" symbols and their contents are visible.

Steve

Re: How to use this template with varying sizes?

John R. Shaw31-Oct-07 23:48

John R. Shaw

31-Oct-07 23:48

I would like to say that I might experiment with that, but I would be lying. Your best bet is to use the strings provided by the STL.

Given that and the fact that you are mixing C++ and C (normal - actually), then internally to your class, use ‘strncmp’ to compare a particular number of characters.

Look if you understand basic programming, then you can write 70% of the C library in a week, including non-standard methods.

int compare(char* s, size_t n)
{
   int i;
   for( i=0; s[i]; ++i )
      if( Data[i] != s[i] )
         return(Data[i] - s[i]);
   return(0);
}

Or something like that.

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

Re: How to use this template with varying sizes?

Stephen Hewitt1-Nov-07 17:50

Stephen Hewitt

1-Nov-07 17:50

template <unsigned char sz> class MyString : MyStringBase<sz>
{
public:
MyString () { Len = 0; Data[Len] = 0}
MyString (const char* src);
template <unsigned char sz>
bool Compare(const MyString<sz2> &rhs, int len);
};
 
template <unsigned char sz>
template <unsigned char sz2>
inline bool MyString<sz>::Compare(const MyString<sz2> &rhs, int len)
{
if (len<0)
len = Len;
return ((Len==rhs.Len) && (Len<=len) && (strncmp(Data,rhs.Data,len)==0));
}

I think VC6 will have trouble with this code and you'll need to move the definition of Compare into the class (in which case drop the bits in italic).

Steve

OnPrint with MFC

mnnca31-Oct-07 7:08

mnnca

31-Oct-07 7:08

Does anyone know why the Print function works in DEBUG mode, but not in RELEASE mode (it is blank)? (Visiual C++ 6.0).

Thanks.

mnnca

Re: OnPrint with MFC

Gofur Halmurat31-Oct-07 7:10

Gofur Halmurat

31-Oct-07 7:10

what is the difference between debug mode and release mode?

Re: OnPrint with MFC

mnnca31-Oct-07 7:29

mnnca

31-Oct-07 7:29

When I compile it (single document MFC app) in debug mode, the document has the right data (on the view and printer).
When I compile it in release mode, the document is always blank.

mnnca

Re: OnPrint with MFC

Mark Salsbery31-Oct-07 7:16

Mark Salsbery

31-Oct-07 7:16

What Print function? What "is blank"?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: OnPrint with MFC

mnnca31-Oct-07 7:34

mnnca

31-Oct-07 7:34

I use standard code from MFC examples:
void CDISKVERView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo)
{
CDISKVERDoc* pDoc = GetDocument();
CScrollView::OnPrepareDC(pDC, pInfo);
pDC->SetMapMode(MM_ANISOTROPIC);
CSize sizeDoc = pDoc->GetDocSize();
sizeDoc.cy = -sizeDoc.cy;
pDC->SetWindowExt(sizeDoc);
CSize sizeNum, sizeDenom;
sizeNum.cx=1;
sizeNum.cy=1;
sizeDenom.cx=1;
sizeDenom.cy=1;
//debug mode works ok
//release mode doesnt work !!dont know why
// GetZoomFactor(&sizeNum, &sizeDenom); this is not a valid function, why?
int xLogPixPerInch = pDC->GetDeviceCaps(LOGPIXELSX);
int yLogPixPerInch = pDC->GetDeviceCaps(LOGPIXELSY);
long xExt = (long)sizeDoc.cx * xLogPixPerInch * sizeNum.cx;
xExt /= 100 * (long)sizeDenom.cx;
long yExt = (long)sizeDoc.cy * yLogPixPerInch * sizeNum.cy;
yExt /= 100 * (long)sizeDenom.cy;
pDC->SetViewportExt((int)xExt, (int)-yExt);
}
The Print function:
pDC->TextOut(x,y, String1);

When I compile it in debug mode, the output/document is ok.
when I compile it in release mode, the output is a blank page.

Thanks.
Mandy

mnnca

Re: OnPrint with MFC

Mark Salsbery31-Oct-07 8:37

Mark Salsbery

31-Oct-07 8:37

Hmm...besides rendering to coordinates that don't map to a visible
area of the page, I can't see what would cause the page to be blank.

You could try adding debug info to your release build project
C++ and linker settings and step throu in the debugger and see if
maybe there's an improperly used ASSERT() macro somewhere or
check values in your printing code to see if you're getting what you
expect.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: OnPrint with MFC

mnnca31-Oct-07 11:06

mnnca

31-Oct-07 11:06

Hi:
Thanks for the tips.
I inserted lots of debug statements (in release mode) to display the cordinates (x,y), they look ok (within page boundary).
There are differences between the debug and release libraries (MSVCRTD.dll, MFC42D.dll, MFCO42D.dll).
One difference I found is the height of the TEXTMETRIC. I even tried to set it to a fixed value (17, as seen in debug mode), it still doesnt work.

mnnca

mnnca

Re: OnPrint with MFC

Mark Salsbery1-Nov-07 5:32

Mark Salsbery

1-Nov-07 5:32

That's a tough one.

It looks like all your y coordinates (when drawing) should be negative
to be visible. Is that the case?

You can try using a window DC instead of a printer DC (like print-preview).
Saves time debugging and maybe you'll see something that you're not seeing
on the printed pages.

You may want to go through the project settings and compare ALL
settings between the release and debug. Make sure there's not a
release setting that would obviously change behavior.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: OnPrint with MFC

mnnca2-Nov-07 10:16

mnnca

2-Nov-07 10:16

I don't know how to use the "window DC" suggested by you.
The blank page is both on preview (monitor display) and on printer output.
Thanks.

mnnca

Re: OnPrint with MFC

mnnca7-Nov-07 7:58

mnnca

7-Nov-07 7:58

I've just tried something else: I use different code (from an old proj) and it works ok now in both debug and release mode.
In a previous post, the OnPrepareDC is from a MFC sample.

void CDISKVERView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo)
{
CFormView::OnPrepareDC(pDC, pInfo);

CClientDC dcScreen(NULL); //Get the display's device context
pDC->SetMapMode(MM_ANISOTROPIC); //Map aspect ratio
// map 1 screen logical inch to 1 printer (/output) logical inch
pDC->SetWindowExt(dcScreen.GetDeviceCaps(LOGPIXELSX),
dcScreen.GetDeviceCaps(LOGPIXELSY)); //Window is display
pDC->SetViewportExt((2*pDC->GetDeviceCaps(LOGPIXELSX)),
(2*pDC->GetDeviceCaps(LOGPIXELSY))); //Viewport is printer

}

mnnca

Re: OnPrint with MFC

Mark Salsbery7-Nov-07 9:45

Mark Salsbery

7-Nov-07 9:45

mnnca wrote:
// map 1 screen logical inch to 1 printer (/output) logical inch

Aren't you mapping 1 screen logical inch to 2 printer logical inches?

I'm still not sure why the other one worked in one build mode and not the other...

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

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