Re: How to reload the content in ifstream? - C / C++ / MFC Discussion Boards

Re: help on using VC++ libraries

hareshel27-Jul-09 18:21

hareshel

27-Jul-09 18:21

yes it is 64bit OS.

n-ary tree traversing

DattaMane27-Jul-09 0:56

DattaMane

27-Jul-09 0:56

Hi all,
i want to traverse n-ary tree?
can someone help me please?

Re: n-ary tree traversing

CPallini27-Jul-09 1:31

CPallini

27-Jul-09 1:31

As forum guidelines [^] suggest, please be specific.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: n-ary tree traversing

David Crow27-Jul-09 3:25

David Crow

27-Jul-09 3:25

DattaMane wrote:
can someone help me please?

See here.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

How to reload the content in ifstream?

DevelopmentNoob27-Jul-09 0:09

DevelopmentNoob

27-Jul-09 0:09

Hi,
how to reload the content inside the ifstream file. Below is a part of code i doing now..

ifstream infile("test.txt");
string line2;
while (!infile.eof())
	{
		getline(infile,line2);
		itotalCount++;
	}

Here is ok.i get the total line in that file.
But next when i need find another info in that file,
the while loop din't function.i think is because the previous line is already reach
the eof..

while (!infile.eof())
{
       somework();
}

So, have any ideal can reload the content? Or there is already got function in stl which i dunno?
I'm waiting your answer..Thank you!

Re: How to reload the content in ifstream?

CPallini27-Jul-09 0:17

CPallini

27-Jul-09 0:17

DevelopmentNoob wrote:
But next when i need find another info in that file,
the while loop din't function.i think is because the previous line is already reach
the eof..

infile.seekg(0, ios::beg);

should do the trick (see [^])
Smile | :)

Re: How to reload the content in ifstream?

DevelopmentNoob27-Jul-09 15:08

DevelopmentNoob

27-Jul-09 15:08

i try the method you teach already. but still cannot work.
yes, it can run in while loop, but when i use infile.getline, the content i get is "".

i use infile.seekg(0), because in msdn, it say that in text file dun use the second method...
Any ideal about it?

Re: How to reload the content in ifstream?

CPallini27-Jul-09 20:53

CPallini

27-Jul-09 20:53

You're right using the first member function. I didn't notice the MSDN note.

DevelopmentNoob wrote:
but when i use infile.getline, the content i get is ""

You get all empty lines or some ones (maybe there are empty lines in your file)?
Smile | :)

CStdioFile Creation fails with exception - no error occurred

Deepak.Prahlad26-Jul-09 23:55

Deepak.Prahlad

26-Jul-09 23:55

Hi All,

I am trying to create a CStdioFile using below code. I plan to create the file where the ".exe" is. If the folder happens to be 'read only' the file creation fails as expected but the exception shows "no error occurred" Sniff | :^)

ie. bRet is FALSE (as expected) when tried to open the file. but the szError is "no error occured" (I guess here it should be "no write permission" or something like that)

Am I doing something wrong in the code? Please help.

BOOL CLoggerDlg::OpenFile(CString szFileName)
{
	CFileException ex;
	BOOL bRet = FALSE;
	if(LogFile.m_hFile == INVALID_HANDLE_VALUE)
	{
		bRet = LogFile.Open(szFileName,CStdioFile::modeCreate | CStdioFile::modeReadWrite | CStdioFile::shareDenyWrite | CStdioFile::modeNoTruncate,NULL);
		if ( !bRet )
		{
			TCHAR szError[1024];
			ex.GetErrorMessage(szError, 1024);
			MessageBox(szError);
		}
	}
	return bRet;
}

Re: CStdioFile Creation fails with exception - no error occurred

CPallini27-Jul-09 0:02

CPallini

27-Jul-09 0:02

You should pass (the address of) ex as last argument of LogFile.Open method,
i.e.

bRet = LogFile.Open(szFileName,CStdioFile::modeCreate | CStdioFile::modeReadWrite | 
   CStdioFile::shareDenyWrite | CStdioFile::modeNoTruncate, &ex);

Re: CStdioFile Creation fails with exception - no error occurred

Deepak.Prahlad27-Jul-09 0:11

Deepak.Prahlad

27-Jul-09 0:11

Thank you for the help.
I corrected the code and now it work as expected
Best regards,
Deepak

Re: CStdioFile Creation fails with exception - no error occurred

Adam Roderick J27-Jul-09 0:12

Adam Roderick J

27-Jul-09 0:12

Try this
FormatMessage and GetLastError instead of CFileException.
LPVOID lpMsgBuf;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL );

AfxMessageBox( (LPCTSTR)lpMsgBuf);

Величие Бога не может быть недооценена.

displaying HEX value of any integer.

MahaKh26-Jul-09 23:24

MahaKh

26-Jul-09 23:24

i want to get the Hexadecimal value of an integer....what is the syntex to find it in VC++?

Re: displaying HEX value of any integer. [modified]

Adam Roderick J26-Jul-09 23:32

Adam Roderick J

26-Jul-09 23:32

simply Use %X or
1. method 1
int nHex = 0;
int nDec = 20;
CString csData;
csData.Format( _T( "%x" ), nDec );
nHex = _wtoi( csData.operator LPCTSTR());

2. method 2
cout<<hex<<17;
Smile | :)

=""

<div="" class="ForumSig">Величие Бога не может быть недооценена.

modified on Monday, July 27, 2009 5:47 AM

Re: displaying HEX value of any integer.

CPallini26-Jul-09 23:36

CPallini

26-Jul-09 23:36

See [^].
For instance:

int k = 65535;
printf("%x\n", k);

Re: displaying HEX value of any integer.

bilal haider27-Jul-09 0:42

bilal haider

27-Jul-09 0:42

you may try this one.
int x=20;
cout<<hex<<x; //x=14 in hexadecimal
use oct for octal.

Re: displaying HEX value of any integer.

CPallini27-Jul-09 0:54

CPallini

27-Jul-09 0:54

Oh, thank you, I'll try for sure. Anyway, maybe the OP is more interested... Roll eyes | :rolleyes:

bluetooth code

pramoddohre26-Jul-09 23:05

pramoddohre

26-Jul-09 23:05

i want code for bluetooth driver can handle microcontroller.
help of microcontroller recive bluetooth data

Re: bluetooth code

CPallini26-Jul-09 23:17

CPallini

26-Jul-09 23:17

Could you please elaborate?

BTW:

pramoddohre wrote:
i want code for

This isn't the best approach to this forum, please read guidelines [^].
Smile | :)

Re: bluetooth code

killabyte26-Jul-09 23:26

killabyte

26-Jul-09 23:26

u want a bluetooth protocol stack by the sounds

http://www.thewirelessdirectory.com/Bluetooth-Software/Bluetooth-Protocol-Stack.htm[^]

HeaderCtrl

kumar sanghvi26-Jul-09 22:51

kumar sanghvi

26-Jul-09 22:51

Hi,
HOw to increase the width of the item in HeaderCtrl...bcos when the font in the Item is Increased the Text is getting ellipsed...

Re: HeaderCtrl [modified]

Adam Roderick J26-Jul-09 22:54

Adam Roderick J

26-Jul-09 22:54

Please refer the code..
you can see the function that is needed for u Smile | :)

http://www.codeguru.com/cpp/controls/listview/headercontrol/article.php/c903[^]

Smile | :)

Величие Бога не может быть недооценена.

modified on Monday, July 27, 2009 5:06 AM

Re: HeaderCtrl

«_Superman_»26-Jul-09 22:56

«_Superman_»

26-Jul-09 22:56

There is an article on CodeProject called Customizing the header control in a ListView[^] which does this.

«_Superman_»
I love work. It gives me something to do between weekends.

Re: HeaderCtrl [modified]

kumar sanghvi26-Jul-09 23:23

kumar sanghvi

26-Jul-09 23:23

In Onpaint of Header im trying as follows..

CHeaderCtrl* pHeader = GetHeader();
int nCount = pHeader->GetItemCount();
int nItem = nCount;
CDC dcMem;
HDC hDC =dcMem.GetSafeHdc();
HDITEM hdi;
while(nItem--)
{
pHeader->GetItemRect(nItem, rItem);
::GetTextExtentPoint(hDC,sText,sText.GetLength(),&size);
hdi.cxy=size.cx;
pHeader->SetItem(nItem,&hdi);
}
but the item of the headerCtrl is not increased

modified on Monday, July 27, 2009 5:29 AM

Re: HeaderCtrl

kumar sanghvi27-Jul-09 0:20

kumar sanghvi

27-Jul-09 0:20

please let me know how to increase the width of the item of HeaderCtrl...

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