C / C++ / MFC Discussion Boards

Re: String problem

Nemanja Trifunovic4-Feb-02 11:47

Nemanja Trifunovic

4-Feb-02 11:47

What you want to do is:

char StringData[11];

memcpy(StringData, StringBuf, 10);
StringData[10] = '\0';

Anyway, the proper way to handle strings in C++ is to use std::string class, and not to hack with char*

I vote pro drink Beer | [beer]

Re: String problem

Stan Shannon4-Feb-02 12:07

Stan Shannon

4-Feb-02 12:07

strncpy does not insert a null. You have to do that manually. I think that is one we've all been bit by at some time. Nemanja's advice is your best alternative.

"Thank you, thank you very much" Elvis.

Re: String problem

Tom Wright4-Feb-02 12:12

Tom Wright

4-Feb-02 12:12

This is what I ended up doing before I tried Nemanja's advice...which by the way was the best advice.

StringBuf[11] = 0x00;
strcpy(StringData, StringBuf);

but I still got garbage in the front of the string that I wanted.
After switching to Nemanja's advice it worked great.
Thanks everyone.

Tom Wright
tawright915@yahoo.com

Re: String problem

Jon Hulatt4-Feb-02 23:27

Jon Hulatt

4-Feb-02 23:27

Tom Wright wrote:
StringBuf[11] = 0x00;
strcpy(StringData, StringBuf);

but in your first post, you were doing it the other way round...

a handy mnemonic to remember is that strcpy and strncpy are layed out like an equals command:

a="hello ";
b="world";

// a=b can be represented like:-
strcpy(a,b);

and noone complain that that code doesnt work, it was an example of a point and it's not really necessary to allocate memory for a concept Smile | :)

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: String problem

Christian Graus4-Feb-02 16:35

Christian Graus

4-Feb-02 16:35

If you must use C strings, then you should do this:

char StringBuf[32400];
memset(&StringBuf, 0, 32400); // I *think* I have the parameters in the right order

Now your string is FULL of NULL, so whatever you copy into it will be NULL terminated.

It's better to use std::string, or you can use CString if you need to convert to wide strings at any point. Then you get operator =, and the strings will resize themselves to take up as much room as you need, and no more.

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Picture the daffodil. And while you do that, I'll be over here going through your stuff.

Lots of Page Faults

Le centriste4-Feb-02 9:27

Le centriste

4-Feb-02 9:27

I have a NT Service (usually runs on Win2K AS), that accepts requests on sockets, process them, and return a response.

We noticed, using Task Manger, that the service had nearly 50,000,000 page faults (after processing around 500,000 requests). Is this normal? If it is not, what could be the cause?

Tx

Michel

P.S.: The service operations don't seem to be affected.

Re: Lots of Page Faults

Jon Sagara4-Feb-02 9:41

Jon Sagara

4-Feb-02 9:41

Sounds like you need more RAM. Smile | :)

Jon Sagara

What about ?

.Net

Mazdak4-Feb-02 9:20

Mazdak

4-Feb-02 9:20

I want to use some .Net features like GDI+ or some namespace we use in c#,
in VC++.Net,I don't know how ,any suggestion or article or..?(should I import their dll into my project?)

Mazy

You can find a solution (even a foolish one) for all problems (even big ones)

Re: .Net

Jay Beckert4-Feb-02 10:07

Jay Beckert

4-Feb-02 10:07

Mazdak wrote:
I want to use some .Net features like GDI+ or some namespace we use in c#,
in VC++.Net,I don't know how ,any suggestion or article or..?(should I import their dll into my project?)

Check out these articles in the .NET section.

http://www.codeproject.com/dotnet/

See Christian Graus's articles on GDI+. Those were of help in getting me started. Just don't confuse POINT with Point and RECT with Rect (That gets me every time). Smile | :)

Re: .Net

Mazdak4-Feb-02 11:36

Mazdak

4-Feb-02 11:36

Thanks ,It is very useful Smile | :)

Mazy

You can find a solution (even a foolish one) for all problems (even big ones)

Re: .Net

Christian Graus4-Feb-02 16:37

Christian Graus

4-Feb-02 16:37

Jay Beckert wrote:
See Christian Graus's articles on GDI+.

They're going to start up again now that I have a new job. Too bad it's probably a bit late now, but I'm going to do a series on image processing.

Jay Beckert wrote:
Those were of help in getting me started. Just don't confuse POINT with Point and RECT with Rect (That gets me every time).

I don't get why Color is the only class with built in conversion to the old types, if I were to write Rect, operator RECT is the third thing I would include ( after copy constructors and operator=).

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Picture the daffodil. And while you do that, I'll be over here going through your stuff.

Re: .Net

Jon Sagara4-Feb-02 16:50

Jon Sagara

4-Feb-02 16:50

I thought you were on holiday? You're working way too hard. Smile | :)

Congrats again on the new job.

Jon Sagara

What about ?

Re: .Net

Christian Graus4-Feb-02 16:56

Christian Graus

4-Feb-02 16:56

Jon Sagara wrote:
Congrats again on the new job.

Thanks - I'm really stoked. Yes, I am on holiday, but I can't do without my dose of CP every day. Plus I'm on cable here, so I'm downloading lots of videos....

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Picture the daffodil. And while you do that, I'll be over here going through your stuff.

Re: .Net

Jay Beckert5-Feb-02 11:05

Jay Beckert

5-Feb-02 11:05

Christian Graus wrote:
They're going to start up again now that I have a new job. Too bad it's probably a bit late now, but I'm going to do a series on image processing.

Nah, never to late and I'll surely be waiting for the series. I just love all the options that are available in GDI++, though I think maybe they made it to easy. Maybe I'm a control freak.

Christian Graus wrote:
I don't get why Color is the only class with built in conversion to the old types, if I were to write Rect, operator RECT is the third thing I would include ( after copy constructors and operator=).

You think? Confused | :confused:

Just when I get confortable with doing it this way, i have to get used to it another way. The conversions would of been nice.

Re: .Net

Christian Graus5-Feb-02 11:13

Christian Graus

5-Feb-02 11:13

Jay Beckert wrote:
I just love all the options that are available in GDI++, though I think maybe they made it to easy. Maybe I'm a control freak.

I agree - I am VERY glad I learned to do all the stuff GDI+ does 'by hand' before GDI+ came along and started doing it for me.

Jay Beckert wrote:
You think? Just when I get confortable with doing it this way, i have to get used to it another way. The conversions would of been nice.

I'm sorry you misunderstood me - I am saying the same thing, I said the 'third thing' only because I would always write the copy constructor and operator= for a class before pretty much anything else. I thought if I said 'first thing' as a turn of phrase someone might ask me why Smile | :)

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Picture the daffodil. And while you do that, I'll be over here going through your stuff.

Re: .Net

Jay Beckert5-Feb-02 11:44

Jay Beckert

5-Feb-02 11:44

Christian Graus wrote:
I'm sorry you misunderstood me - I am saying the same thing, I said the 'third thing' only because I would always write the copy constructor and operator= for a class before pretty much anything else. I thought if I said 'first thing' as a turn of phrase someone might ask me why

I understood you Christian. I think I confused you; I said "You think?" as in you would think they added the conversions just as Color. Sorry about that. I'll point at some one else and say we're with them. Hows that? Wink | ;)

Better image display and printing

4-Feb-02 8:39

I'm looking for a way of taking an image file (bmp, gif or jpeg) and displaying or printing it with the same sort of quality that MS Word produces when the image has to be strected or shrunk. MS Word does some sort of dithering to make the edges fuzzy, whereas most stretch routines just lose/gain solid pixels.

Anyone got any code to do this or can suggest something?

Thanks,
Keith Worden

Re: Better image display and printing

Shog⁹4-Feb-02 8:47

Shog⁹

4-Feb-02 8:47

This looks like it might work for you:
Two Pass Scaling using Filters

farewell goodnight last one out turn out the lights

Smashing Pumpkins, Tales of a Scorched Earth

Re: Better image display and printing

Joaquín M López Muñoz4-Feb-02 8:56

Joaquín M López Muñoz

4-Feb-02 8:56

For image display, I found in the past that <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/mmfunc_76if.asp">DrawDibDraw</a> does a fairly good job (smooth scaling, dithering...)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Better image display and printing

C^hris L^osinger4-Feb-02 9:15

C^hris L^osinger

4-Feb-02 9:15

i always recommend ImgSource, but i've found you get decent results from SetStretchBltMode(COLORONCOLOR);

-c

Smaller Animals Software, Inc.

use a String ...

magpierre4-Feb-02 7:58

magpierre

4-Feb-02 7:58

I do not know how to create a String , I'd like to do something like
String s = new String("hello");

and I'd like also to know how to compare 2 strings

thanks

Pierre

Re: use a String ...

Jon Sagara4-Feb-02 8:08

Jon Sagara

4-Feb-02 8:08

Look up the class CString in MSDN.

Jon Sagara

What about ?

Re: use a String ...

Carlos Antollini4-Feb-02 8:31

Carlos Antollini

4-Feb-02 8:31

Use the Class CString and the function method Compare or CompareNoCase....

CString str = _T("Hello");

if(str.Compare("Hello") == 0)
{
  AfxMessageBox("Equal");
}

Regards

APATHY ERROR: Don't bother striking any key. Application has reported a "Not My Fault" in module KRNL.EXE in line 0200:103F

Carlos Antollini.
Sonork ID 100.10529 cantollini

netbios name

orcun colak4-Feb-02 7:37

orcun colak

4-Feb-02 7:37

Perhaps this question has been asked before but I could not find it.
How can I get the netbios name of a computer in my lan if I only know its ip number ?

Orcun Colak

Re: netbios name

Igor Sukhov4-Feb-02 10:13

Igor Sukhov

4-Feb-02 10:13

Try these funtions from Windows Sockets API:

getnameinfo,
gethostbyaddr

Best regards,

-----------
Igor Soukhov (Brainbench/Tekmetrics ID:50759)
igor@soukhov.com | ICQ:57404554 | http://soukhov.com

Russian Software Developer Network

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