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Hi.
I would like to limit the number of characters a user make enter at any given time to a finite integer. For example, let say I have an edit box in a dialog box for entering zip code. I would like to limit the number of characters to *exactly five*.
I have tried using DDV verification feature in a dialog box. However, I found that the user can overflow the edit box. For example:
limit: 500
User: 500000
If the user overflow the edit box, for DDV will consider the data entered as being valid. I believe the problem has something to do with overflowing a datatype.
Nonetheless, what is the best way to limit the number of characters/digits entered in an edit box?
Thanks,
Kuphryn
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Have a look at Alvaro Mendez' article Validating Edit Controls. He provides several CEdit-derived controls for limitting user input --I guess they can serve your needs.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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You just go to ClassWizard, go to member variables sheet,
you can see at the bottom of sheet, there is a property:
Maximum character !!!!!!!
Hung Son
A Vietnamese student
i-g.hypermart.net
dlhson2001@yahoo.com
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Look up the CEdit::SetLimitText function
Michael 
Errata 1: p. 154, section 'Defusing'. For 'red wire' read 'blue wire'.
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Okay.
The solution is to use a CString variable holding the value of the edit box. I am referring to the example of the five digit zip code. For example, lets consider that the variable is an int. If the variable is declared as an int, there will be an overflow if the user enters 99999999999999. The solution I came up with is to define it as a CString. Here is the verification part.
-----
void CMyDlg::OnEnChangeMyEditBox()
{
UpdateData(TRUE);
// the length must be exactly five
// the value must be between 10000 and 91000
if (m_EditPortListen.GetLength() == 5 &&
atoi(static_cast<lpctstr>(m_MyEditBox)) >= 10000 &&
atoi(static_cast<lpctstr>(m_MyEditBox)) <= 91000)
SetModified(TRUE);
else
{
m_MyEditBox.Format("%d", 10000);
UpdateData(FALSE);
SetModified(FALSE);
}
}
-----
The code above works well.
Kuphryn
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Any code to deal these answers:
-Set Editbox or Listcontrol's font to Unicode ?
-UpdateData() to get some string in Editbox and ListControl to a CString var ?
-Compare 2 CString vars containing Unicode string ?
Thanks.
Hung Son
A Vietnamese student
i-g.hypermart.net
dlhson2001@yahoo.com
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If you want to create a UNICODE version of a control, you will need to user CreateWindowW instead of the plain CreateWindow which is converted by the preprocessor to a CreateWindowA call if you are using ansi.
You will then have a window that can handle UNICODE fonts, however, if you want to load a font from a different locality you will have other issues to work through. If this is what you want post another question and I will try to help you.
If you are not compiling your application in UNICODE, then you will be out of luck getting UNICODE data into a CString unless you have version 7.0 of the CString class. All versions prior to 7.0 compile with either chars or wchar_t, but you can not use both at the same time. Version 7.0 parameterizes the string and allows you to define the type that you want to create.
Good Luck
Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!
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How can I get coordinates of the current character (in current line) in a rich edit control ?
I'm tired with LineIndex, LineCount, GetCharPos, Get...get..
but cannot find solution.
Hung Son
A Vietnamese student
i-g.hypermart.net
dlhson2001@yahoo.com
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Make sure you are using the correct version of richedit control. Version 1 does not support the character position functions. Use version 2 or above. It should be defined in one of your header files.
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Hi all,
I searching the code for retrieve the data traffic of a computer(of a local network) using IP address, anyone could help me?!
I find the code for retieve computer name and ip address and now i would retrieve the traffic.
Thanks and sorry for may terrible english.
Ciao!
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I don' tknow if this is more than you need, but try looking up Layered Service Providers for winsock 2.0.
Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!
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But is not possible retrieve information about traffic using function like Ping?! I try to create a program like a sniffer but I don't want to retrieve data but only the quantity of data that transit on a IP address, only the traffic.
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I'm trying to make a simple menu, with a Listbox and a butten..
The Listbox will contain a lists of programs, and the button will execute the program selected on the list box..
I created a simple Dialog base App(no mfc)
But I can figure out how to input data in the list box..
Like.
LIST_GAMES
----------
Quake
DOOM
Half-Life
How to do this ? 
Thanks
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For add a string into ListBox try:
ListBox.InsertItem(0,"you string");
If you want scan a directory, find files and add this in the ListBox:
CFileFind finder;
BOOL bWorking;
CString fullpath;
strPath = strPath + "*.*";
bWorking = finder.FindFile(strPath);
while (bWorking)
{
bWorking = finder.FindNextFile();
if ( !finder.IsDirectory())
{
CTime FileTime;
CString strFileName,strFileTime;
strFileName = fullpath+finder.GetFileName();
finder.GetLastWriteTime(FileTime);
strFileTime = FileTime.Format("%Y/%m/%d %H.%M");
SHFILEINFO shinfo;
SHGetFileInfo( strFileName,
0,
&shinfo,
sizeof( shinfo ),
SHGFI_ICON |
SHGFI_SMALLICON );
int j = InsertItem(0,finder.GetFileName());
SetItemText (j,1,strFileTime); //2nd column
}
} //end while
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What file should I add to my project so I can use the ListBox class?
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If you are in a dialog based project just add the control ListBox, create the global variable associted and use it.
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Hi, pals!
I write a simple console application using VC6.0. There are only file read/write tasks in my application. I run the program from the command window of Windows Me. But they have different result when running the program. The debug version has the correct result. And the release version has the wrong result. (I only use FILE, fopen, fclose, fread, fwrite in my application.)
Can you give me suggestions?
Best regards,
George Ma
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Check to make sure all your variables are initialised and that you aren't overflowing any buffers.
Michael
Errata 1: p. 154, section 'Defusing'. For 'red wire' read 'blue wire'.
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Thanks, Michael pal!
Do variable initialization and buffer overflow have anything to do with debug and release versions? Can you give me a simple explanation?
Best regards,
George Ma
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In debug there is usually a bit more space around variables (less optimization) so if you declare a char array followed by an int for example...
<br />
char a[3];<br />
int x;<br />
then do something like:
<br />
x = 0;<br />
for (i=1;i<=3;i++)<br />
a[i] = i;<br />
In debug everything may work perfectly but in release writing 3 to a[3] would probably change the value of x. The legal indexes of a[] are 0, 1, and 2.
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Hi,
Guys, I want to implement TCP/IP stack over TAPI connection - can neone guide
Sameer
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What TSP are you using? I'm assuming you are using a modem which makes it likely that your TSP is the unimodem driver.
Why do you need TCP/IP, won't standard serial communication do the job?
Michael
Errata 1: p. 154, section 'Defusing'. For 'red wire' read 'blue wire'.
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Hi,
No i want to implement TCP/IP
like RAS but they are both Win98
Sameer
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Well, you shoud configure one of the machines (and only one) as a RAS Server. Launch the explorer, go to the Dial-up folder and you'll find a link to the RAS Server configuration dialog in the "Connections" menu.
Once you're done with this, the client app should initiate a RAS connection with RasDial and all that stuff (you can do it non-programmatically, of course). When the connection is established, both programs can communicate with TCP/IP using the regular Winsock procedures.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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