Re: isdigit(); - C / C++ / MFC Discussion Boards

RChin21-Nov-03 1:48

21-Nov-03 1:48

I don't think CP has a news server... does it?
It does have a few rss xml feeds though.
http://www.codeproject.com/info/stuff.asp[^]

I Dream of Absolute Zero

Re: Does anyone knows this

Michael P Butler21-Nov-03 2:49

Michael P Butler

21-Nov-03 2:49

There is now NNTP support on these forums, they are web-only.

Michael

'Logic, my dear Zoe, merely enables one to be wrong with authority.' - The Doctor: The Wheel in Space

isdigit();

WREY21-Nov-03 0:54

WREY

21-Nov-03 0:54

My understanding of "isdigit()" is that it takes a parameter and checks whether it's a digit. It will then return true or false depending on what the parameter value turns out to be.

Fair enough, I constructed my "if" statement based on this understanding, only to find out that the opposite is what's happening. Here's some code.

string str;
int nbr = atoi(str.c_str());
...
if(isdigit(nbr))
    // do digital processing
else
    // report error

Prior to reaching the "if" statement, "nbr" is assigned a numeric value (by making sure that 'str' is numeric), but instead of doing the digital processing, it does the error reporting routine. Interestingly, if I were to test for "!isdigit(nbr), it does the digital processing. (But then why would it do the digital processing if nbr is not numeric?)

Why is this? Am I using "isdigit()" wrongly?

Thanks for any insight.

Unsure | :~

William

Fortes in fide et opere!

Re: isdigit();

Taka Muraoka21-Nov-03 0:59

Taka Muraoka

21-Nov-03 0:59

isdigit() takes a character value, not an integer.

"Sucks less" isn't progress - Kent Beck [^]

Awasu 1.1.4 [^]: A free RSS reader with support for Code Project.

Re: isdigit();

WREY21-Nov-03 1:11

WREY

21-Nov-03 1:11

Then how come <ctype> and <ctype.h> defines it as:

int isdigit(int c);

William

Fortes in fide et opere!

Re: isdigit();

Taka Muraoka21-Nov-03 1:12

Taka Muraoka

21-Nov-03 1:12

Because passing char's as parameters tends to cause problems.

Just try it Smile | :)

"Sucks less" isn't progress - Kent Beck [^]

Awasu 1.1.4 [^]: A free RSS reader with support for Code Project.

Re: isdigit();

WREY21-Nov-03 1:22

WREY

21-Nov-03 1:22

OK! I did try it. I substituted 'nbr' for a 'char' value and ran the program, and even though I entered a numeric value, the program crashed!

It didn't crash when I was using 'nbr' instead.

William

Fortes in fide et opere!

Re: isdigit();

Michael Dunn21-Nov-03 4:23

Michael Dunn

21-Nov-03 4:23

isdigit() tests whether a character is a digit. Pass in a char, not an int. The parameter is defined as an int because all the functions that operate on characters are defined that way. Yes, it's weird. (The reason is that EOF is -1, which is outside the range of char, so they had to use a larger type instead.)

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber
Laugh it up, fuzzball.

CSV file into Excel Sheet

KKR21-Nov-03 0:42

KKR

21-Nov-03 0:42

I need to convert CSV file into an Excel Sheet. Can I have suggesstions or article where can I get the information.
Thanks in advance

Warm Regards,
KKR

Re: CSV file into Excel Sheet

Adam Gritt21-Nov-03 3:15

Adam Gritt

21-Nov-03 3:15

Assuming through code, just use the Excel COM object and tell it to open the csv file. Then tell it to save as Excel file.

Re: CSV file into Excel Sheet

Peter Molnar21-Nov-03 9:32

Peter Molnar

21-Nov-03 9:32

There are two ways:

1.Using ODBC Excel driver which is available on all Windows PC's even without M$ Office installed, neither on your nor your user's PC.
For an example see this:

http://www.codeproject.com/database/excel_odbc_write.asp[^]

2.Using Excel automation, requires Office both on you and your user's PC
See Adam's message above, and MSDN for Office automation.

Peter Molnar

File's physical address??

andrea_rizzini@yahoo.co.uk21-Nov-03 0:25

andrea_rizzini@yahoo.co.uk

21-Nov-03 0:25

Hi lads, i have a challenging question for you all:

I'm using ReadDirectoryChangesW to monitor the file usage in the system.

Then i'm using the CFile constructor to (GetLenght, GetStatus, GetFilePath, etc) extract the file's informations.

I need a way to find the file physical address... address on the hardisk!!!

Your help is very much appreciated....

Ade

Re: File's physical address??

Peter Molnar21-Nov-03 9:31

Peter Molnar

21-Nov-03 9:31

ReadDirectoryChanges uses a FILE_NOTIFY_INFORMATION struct to give you the paths of changed files.

FILE_NOTIFY_INFORMATION fni[100];
while (ReadDirectoryChangesW(...,&fni,...) //no overlapped
{
if (fni[0].Action == ...added || fni[0].Action == ...removed || fni[0].Action == ...Modified)
   DoSomethingWhenAddedRemovedOrModified(..);

for (int i = 0; !fni[i].NextEntryOffset; i++)
   ShowFileName(fni[i].FileName); //Do something with it   
}

Peter Molnar

Re: File's physical address??

andrea_rizzini@yahoo.co.uk22-Nov-03 2:25

andrea_rizzini@yahoo.co.uk

22-Nov-03 2:25

Hi peter,
thanks for your help, i know how to find a file path,
i just want to know how to find the files physical location / address in main memory (hardisk)!!! example

Sector 123542 Lenght: 3 Block ( or whatever unit: cluster / sector / block / etc )

anyone else ??? !!!!

Frown | :(

Re: File's physical address??

фил27-Nov-03 5:48

фил

27-Nov-03 5:48

hi,

i don't believe you'll ever be able to do that with just ring3 priviledges.
just OSs have access to such data.

Phil

'Assigning' Clients from Threads so API can send to specific Client.

Roland_198020-Nov-03 23:48

Roland_1980

20-Nov-03 23:48

Hi,

Maybe this is a stupid question, but I'm a rookie Hmmm | :|

.

I'm working on a Chat-Server and got it working with threads;

<br />
void __fastcall TMain::ServerSocketGetThread(TObject *Sender,<br />
      TServerClientWinSocket *ClientSocket, TServerClientThread *&SocketThread)<br />
{<br />
  // New connection -> new Thread...<br />
  SocketThread = new TMyServerThread(false, ClientSocket);<br />
}<br />
<br />
// --<br />
<br />
void __fastcall TMyServerThread::ClientExecute(void) <br />
{<br />
   // make sure connection is active...<br />
   while (!Terminated && ClientSocket->Connected)<br />
   {<br />
      try<br />
      {<br />
         // Now, use TWinSocketStream to read or write information<br />
         // over a blocking socket connection...<br />
         TWinSocketStream *pStream = new TWinSocketStream(ClientSocket, CLIENTWAITTIME);<br />
<br />
         try<br />
         {<br />
         etc.<br />

...but now I want to 'assign' each incoming Client... so like in a list. Also want to show all connected Clients in a ListView.

I know how to send text/a buffer in a thread, but how can I send to a specific(assigned) Client from the 'Main' form/api?!

Am a bit lost Sigh | :sigh:

.

Roland(BE).

Re: 'Assigning' Clients from Threads so API can send to specific Client.

l a u r e n21-Nov-03 18:58

l a u r e n

21-Nov-03 18:58

if i understand u right u need to keep a list of users with ip addresses when they connect

then u can route msgs to specific users

or did i misunderstand completely?

"there is no spoon"
biz stuff about me

rounding a float

Jerome Conus20-Nov-03 23:47

Jerome Conus

20-Nov-03 23:47

Hi !

This is I guess a stupid question, but I'm wondering how in C++ I can round a float :

if I do :

int i=1.6;

I get : i=1;

but I'd like instead i=2 !

Is there an easy way to do this, or do I have to do the work by myself ?
Thanks !
Jerome

Re: rounding a float

Ryan Roberts20-Nov-03 23:52

Ryan Roberts

20-Nov-03 23:52

Use ceil(), from math.h.

HTH

Ryan

Re: rounding a float

Jerome Conus20-Nov-03 23:57

Jerome Conus

20-Nov-03 23:57

Ryan Roberts wrote:
Use ceil(), from math.h.

Well, the result is not the one expected.

I'll try to make myself clear :

the float number 1.6 should be rounded to 2
the float number 1.5 should be rounded to 2
the float number 1.2 should be rounded to 1

the ceil() function always round to the upper integer.

I cannot find the function which will round my float number correctly according to mathematic rules. ceil() and floor() are not doing what I want !

Jerome

Re: rounding a float

Ryan Roberts21-Nov-03 0:02

Ryan Roberts

21-Nov-03 0:02

Must listen to question, this is the reason I was always crap at maths.

You actualy want to call.. round().. damn cryptic function names Poke tongue | ;-P

HTH

Ryan

Re: rounding a float

Jerome Conus21-Nov-03 0:54

Jerome Conus

21-Nov-03 0:54

Ryan Roberts wrote:
You actualy want to call.. round()..
But it doesn't exists ! I try to find it in the MSDN, but it is not.....

mmmhh it looks like I'll have to write my own !
Jerome

Re: rounding a float

Roger Allen21-Nov-03 1:19

Roger Allen

21-Nov-03 1:19

// this rounds to nearest whole number
int round = (int)((val < 0) ? (val - 0.5) : (val + 0.5));

Roger Allen - Sonork 100.10016
If your dead and reading this, then you have no life!

Re: rounding a float

Ryan Roberts21-Nov-03 3:13

Ryan Roberts

21-Nov-03 3:13

Its in stlport. Guess they have to be different

Try #define round(x) floor(x+0.5)

Ryan.

Re: rounding a float

jhwurmbach21-Nov-03 1:22

jhwurmbach

21-Nov-03 1:22

Try this one:

<br />
double a=1.6;    <br />
int i = static_cast<int>(a+0.5);

Who is 'General Failure'? And why is he reading my harddisk?!?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.