isalpha, isalnum - C / C++ / MFC Discussion Boards

sstoyan15-Mar-04 3:50

15-Mar-04 3:50

thank you.
now i have to find a way to check if the text is unicode or not - istextunicode() doesnt seem to work correctly

Re: CRichEditCtrl and UNICODE

Steve S15-Mar-04 22:15

Steve S

15-Mar-04 22:15

First off, you can check for a BOM (byte order mark), and if there isn't one, scan for EOL ('\n') BYTE using memchr(). If you find one, and there are NUL ('\0') bytes either side of it, it's almost certainly UNICODE.

If your text contains only one line, this won't work, of course.

Steve S

Re: CRichEditCtrl and UNICODE

sstoyan15-Mar-04 23:15

sstoyan

15-Mar-04 23:15

thank you agan.
i decided not to detect if it is unicode programmatically, but still a have a small problem left - when i display unicode string there is some garbage at the beginning of the text (1-2 bytes, "FF FE" usually), any idea how to avoid it?
may be i should start reading the file with StreamIn from the first ASCII code ?

How can i save a text string as a tga file

Orochi14-Mar-04 3:39

Orochi

14-Mar-04 3:39

How can i save save a text string with formatting to a tga file using GDI??

Rashid

It is necessary once in one's life to put every thing in doubt, so far as possible, in order to reach the truth. DesCartes

Re: How can i save a text string as a tga file

Christian Graus14-Mar-04 15:55

Christian Graus

14-Mar-04 15:55

You can't save a TGA file using GDI, if you can't use GDI+, you need to use another library like Paintlib.

To save the string, you need to draw it onto the bitmap.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

URL Does not use a Recognized protocol

muckmail14-Mar-04 2:44

muckmail

14-Mar-04 2:44

I used a program that accesses the internet form a book called "Sams teach your self Visaul C++ 6
Online in Web time" ( isbn 067231668) The program is at page 496. I also used the sample program off the CD rom and get the same result. Every time I use the program I get "URL Does not use a Recognized protocol" Where do I go from here to solve this problem?
Thank you,
doug@evansville.net

Re: URL Does not use a Recognized protocol

Ravi Bhavnani14-Mar-04 9:20

Ravi Bhavnani

14-Mar-04 9:20

Perhaps you're using a misspelled protocol, eg: htpt://foo.com ?

/ravi

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isalpha, isalnum

nss14-Mar-04 2:17

nss

14-Mar-04 2:17

1.These two are supposed to take int args: Yet I see them being used a as isalpha('t') etc, i.e we are giving it a char arg. Why is that?

2.I did:

  char r[256] ;
  int t;
  cout << " enter string  ";
  char c = cin.peek();
  cin >> r;
  while (c != '\n')


    {
      c = cin.peek();
      if (isalpha(c))cin >> r;
    }
  cout  << " tr" << r << endl;
}

but when I put in 'abc%def' i got back the identical thing, not 'abcdef' which is what I expected...

3.Also I wanted to weed out spl chars using isalnum so that an input like
abd$ef would get fed in and come out like abdef:

char s[256];
cin >>s;

but isalnum wont work either...
Confused | :confused:

thanks,
ns

Re: isalpha, isalnum

Michael Dunn14-Mar-04 4:43

Michael Dunn

14-Mar-04 4:43

nss wrote:
These two are supposed to take int args: Yet I see them being used a as isalpha('t')

The original C library has some, shall we say, "interesting" designs. One of them being that the character-oriented functions (most notably getchar()) actually operate on ints. This is because of EOF, which is a special value that cannot be a legal char value. So the parameter type is something that can hold all legal char values, plus EOF, and they chose int.

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
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Re: isalpha, isalnum

Antti Keskinen14-Mar-04 10:32

Antti Keskinen

14-Mar-04 10:32

As an answer to the first reply:

I wouldn't say 'interesting'. I find it extremely useful that I can use both character symbols and integers to a character stream. Using an integer variable with a character conversion gives me access to symbols that are not normally available in the C/C++ coding syntax, such as scandinavian characters.

Now, for the other questions. Firstly, you should consider using some other stream input function. Read the entire input string in first, then go through the string, removing all invalid characters. The problem with your function above is that when you peek the character, and then test it in against the alphanumeric conversion, you don't explicitly convert the character into an integer. Add an (int) conversion operator before c. This might solve the problem, but an even better implementation is to read the entire string first.

What happens now is that you peek the character, and if it is alphanumeric, it is read into the input stream. If it is not alphanumeric, the character is left into the input stream, and you peek for the next character. As it happens now, the next character is considered alphanumeric, and the cin >> operation executes, and it actually reads everything from the input stream into the buffer, because r has lots of space available.

Here is an alternative implementation that is a bit closer on what you are trying to accomplish:

char buffer[256];
char c;
int nIndex = 0;<DIV>

cout << "Enter string: ";<DIV>

while (c != '\n')
{
   cin >> c; // Alternatively, you could use _getch or cin.read( &c, 1)
   if ( isalpha( (int)c ) )
   {
      buffer[nIndex] = c;
      nIndex++;
   }
}

Not sure if that will work, but test it out & debug if needed.. But you should get the big picture Smile | :)

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

Re: isalpha, isalnum

nss15-Mar-04 12:40

nss

15-Mar-04 12:40

thanks!

How do i create window with menu styles

anematollahi14-Mar-04 0:16

anematollahi

14-Mar-04 0:16

i want to create a window that when the application or dialog is deactivated
or when mouse is clicked ont over of menu rect this window automatically
close.
thanks

Re: How do i create window with menu styles

Prakash Nadar14-Mar-04 0:27

Prakash Nadar

14-Mar-04 0:27

you need to add a handler for WM_KILLFOCUS event and then post WM_QUIT message to your application.

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prakashnadar@msn.com

doc-view and database problem

heuriskeinner13-Mar-04 23:59

heuriskeinner

13-Mar-04 23:59

i am making a application which takes input from serial port and stores it in access database, Now i have been asked whether its possible to give user option to choose database to feed data into (through FILE->Open)
Also if it is possible to create a new database ( new .mdb file )in File->new
This is my first professional project and i dont have any other technical inputs except this site. I want to know whether its allowed/possible ( copyright issues ?) to create file in Ms access format ? and if yes how ? which classes will be useful to me ?

Heuriskeinner

Re: doc-view and database problem

Prakash Nadar14-Mar-04 0:25

Prakash Nadar

14-Mar-04 0:25

heuriskeinner wrote:
if it is possible to create a new database ( new .mdb file )in File->new

yes it is possible, you need to use the appropriate sql command i.e "Create database..." to create a new database.

heuriskeinner wrote:
which classes will be useful to me ?

CDaoDatabase and its supporting classes will be usefull for you.

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prakashnadar@msn.com

Required header <conio.h> of C-library

oOomen13-Mar-04 23:48

oOomen

13-Mar-04 23:48

hi,
do someone know witch DLL file can contains all nio functions?
like this one: int _kbhit( void ); //Checks the console for keyboard input.
i want to import this function in my c# application.
thank u in advance!

Re: Required header <conio.h> of C-library

Prakash Nadar14-Mar-04 0:23

Prakash Nadar

14-Mar-04 0:23

LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version

anyways i belive in C# there must be something similar to kbhit.

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Re: Required header <conio.h> of C-library

oOomen14-Mar-04 2:02

oOomen

14-Mar-04 2:02

hi, thank u for ur replay.
i've found this in msvcr71.dll too.

i do not think so.
everything u have in c# is Console class.
best regards!

Re: Required header <conio.h> of C-library

Prakash Nadar14-Mar-04 2:20

Prakash Nadar

14-Mar-04 2:20

oOomen wrote:
i've found this in msvcr71.dll too

you will need msvcr71.lib to use that dll.

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Re: Required header <conio.h> of C-library

oOomen14-Mar-04 3:57

oOomen

14-Mar-04 3:57

Mr.Prakash wrote:
you will need msvcr71.lib to use that dll.

mMmm...
i just know this way!

<br />
[System.Runtime.InteropServices.DllImport("msvcr71.dll")]<br />
		static extern int _kbhit();<br />
<br />
		public bool KeyboardHit<br />
		{<br />
			get<br />
			{<br />
				return System.Convert.ToBoolean(_kbhit());<br />
			}<br />
	        }<br />

Re: Required header <conio.h> of C-library

Prakash Nadar14-Mar-04 6:01

Prakash Nadar

14-Mar-04 6:01

Oh ok, you know the best how to import it in the C# application, coz i dont know anything about C# atleast for now.
Smile | :)

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MFC: Problem using CWnd::SendMessage

Davex_13-Mar-04 17:20

Davex_

13-Mar-04 17:20

Hello all,

I'm presently learning how to use my own message handlers in my MFC application. I read this article: Windows Message Handling - Part 2 here: http://www.codeproject.com/dialog/messagehandling2.asp.

I have a problem with one line of code; when I need to get the CWnd* to send the message.
In my case, I want to send the message to my main view based on CFormView when I'm in another dialog or class.
Here's how I was trying to do it:

pMyMainView = CWnd::FindWindow(_T("CMyMainView"),NULL);
pMyMainView->SendMessage(WM_MYMESSAGE,0,0);

But FindWindow don't find my CMyMainView, so I can't send the message.

I tried "this->SendMessage(WM_MYMESSAGE,0,0);" in my CMyMainView.cpp to verify my message handler and it's working.

It must be so simple! But I started coding in C++ and MFC only 1 month ago. Smile | :)

Thanks,
Dave

Re: MFC: Problem using CWnd::SendMessage

Ravi Bhavnani13-Mar-04 17:28

Ravi Bhavnani

13-Mar-04 17:28

I'm not sure what you mean by "my main view". To get the application's main window, use AfxGetMainWnd(). To get the dialog's parent window, use GetParent(). Hope this helps.

/ravi

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Re: MFC: Problem using CWnd::SendMessage

Davex_14-Mar-04 4:16

Davex_

14-Mar-04 4:16

Thank You Ravi, I knew it was simple, but...! hehe It worked with GetParent();

Property Pages/Sheets/Tab Controls

Anonymous13-Mar-04 14:41

Anonymous

13-Mar-04 14:41

Hi,

I have an existing dialog and I add a tab control from the resource editor. I call the CTabCtrl::InsertItem() function and can add tabs to the control but I cannot put anything in them. I can also create a property sheet and add property pages but my property sheet has an OK, Cancel, Apply and Help button which I don't want. What I really want is to create my tab control and add my property pages to the tab control but I do not know any way to associate property page with tab control.

Please help.

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