Re: vsnprintf() - C / C++ / MFC Discussion Boards

Re: ODBC- too long text trnasmition problem

Rafix11114-Sep-09 9:35

14-Sep-09 9:35

It seems to me that the error can cause code (line 1008 in DBRFX.CPP file):

............
pFX->Default(szName, &value, plLength,
SQL_C_CHAR, value.GetLength(), nMaxLength);
..........

While debbuging program nMaxLength has value 255, but I do not know where gets it from.
And what can I do.

Set property of folder?

Arrin14-Sep-09 1:58

Arrin

14-Sep-09 1:58

Hi,
is there any way to set property of a folder as zip-folder?
I create a new folder using CreateDirectory() for some data from my program, and set this folder as compressed, now i need to set this same folder as zipped folder!!
I don't want to create first a zip file and add some files to them, i create a compressed folder with CreateDirectory() and add some files to them,
and now i like to set them as compressed(zipped), is there any way how to do this?? Any idea how to do this??

Thanks for any help!
Arrin

Re: Set property of folder?

Iain Clarke, Warrior Programmer14-Sep-09 2:23

Iain Clarke, Warrior Programmer

14-Sep-09 2:23

Feel free to correct me but...

There is no such thing as a "zip-folder".

There are normal directories, and NTFS can compress files in it. You gain space, and lose time.

There are zip files. Explorer very kindly has an already installed shell extension which makes them look a lot like a directory. Explorer is lieing to you, in the interests of ease of use. This is good.

I can't really help you, as it sounds like you already know how to do this, you just don't like it.

Did that make sense?

Iain.

I have now moved to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), or need cotract work done, give me a job! http://cv.imcsoft.co.uk/[^]

Re: Set property of folder?

Arrin14-Sep-09 3:00

Arrin

14-Sep-09 3:00

Hello Ian,
thanks for answer.
I don't know how to do this, if yes, i will never ask something here, the time is to expensive for that!
You know that, when you make a right mouse click on a folder or file in explorer, its open a menu, and one of choices is "Send to archive" (or similar, sorry about my english),
that is what i mean!!
If this don't work, i know here is a Zip Utils that i can use, but i like to try this first!

I can only show my try, its like this:

DWORD dwFileMask;
long mask;
dwFileMask = GetFileAttributes(csCurFolder);
mask = dwFileMask;
if(!(dwFileMask & FILE_ATTRIBUTE_ARCHIVE)) // set my new createt folder as a archive :)
{
    mask = dwFileMask | FILE_ATTRIBUTE_ARCHIVE;
    SetFileAttributes(csCurFolder, mask);
}

but thanks for your help Smile | :)

Arrin

Re: Set property of folder?

Iain Clarke, Warrior Programmer14-Sep-09 3:20

Iain Clarke, Warrior Programmer

14-Sep-09 3:20

The archive attribute for a folder is used by backup programs - it's not the same thing as a zip file.

There are zip library articles here on CP. I don't know a specific one to recommend, but CP is searchable. Once you've read several, you will know more than me about them.

1/ So, make the files you want. Put them somewhere temporary.
2/ Make a zip file containing those files. <-- this is the hard bit, but look at CP articles.
3/ Delete the original temporary files.

The right-click thing in explorer is a context menu extension, and just does step 2 above.

Good luck,

Iain.

vsnprintf()

shriniwas198514-Sep-09 1:52

shriniwas1985

14-Sep-09 1:52

Hi Guys,
I am having an issue with vsnrpintf() function.
My function posts an error message by formatting it using vsnprintf()
Ex:
void SetErrorInfo(const CHAR* lpzformat, ...)
{
va_list();
va_start(vargs,lpzformat);
_vsntprintf(szbuf,MAX_PATH,lpzformat,vargs);
}
This is crashing when i dont have arguments passed to this function and the formatted string has "%n" or "%s" which are known place holders for BufferOverflow.
Can anyone let me know if i can get a count of vargs argument list and based on that decide whether to use
vsnprintf() or not?

Re: vsnprintf()

David Crow14-Sep-09 3:35

David Crow

14-Sep-09 3:35

shriniwas1985 wrote:
This is crashing when i dont have arguments passed to this function and the formatted string has "%n" or "%s"...

This is a side effect of variable argument functions like printf(). You can have more arguments than % in the formatting string, but not vice versa.

"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

Re: vsnprintf()

shriniwas198514-Sep-09 4:40

shriniwas1985

14-Sep-09 4:40

Hi,
That is very much true, but cant we have a check on the arguments, as in if there are no arguments and the formatted string has %n or %s, then instead of vsprintf() simple sprintf(buf,"%s",lpsformat); can be called.
Atleast that solves the problem.
But i am not able to find the count for no of arguments.

Re: vsnprintf()

norish14-Sep-09 7:32

norish

14-Sep-09 7:32

I think it is not posible to avoid such error in generally.
Because we cannot detect argument count for function(format, ...) at execution time.

Uncertain ideas here.
1. Always pass some constant which has reserved pattern which indecates the last arg.
2. Use try-catch block defined in c++.
3. Use SEH (__try-__catch) defined by MS.
4. Abandon f(a,...) style function. Dead | X|

Re: vsnprintf()

Joe Woodbury14-Sep-09 8:08

Joe Woodbury

14-Sep-09 8:08

Even if you count them yourself, so what? You still can't pass, say, a 1 for a %s parameter and not have it fail.

I have a safe format function which is basically the following (with more error and exception processing, but this gives the gist):

__try
{
	return _vsnprintf(pBuffer, bufferLen, pFormat, args);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
	Copies raw format string into buffer
}

Re: vsnprintf()

Member 419459314-Sep-09 9:07

Member 4194593

14-Sep-09 9:07

You say that this is YOUR function to post an error message, thus it is assumed that it is YOUR code that is calling this function. I would suggest that you examine all calls to SetErrorInfo in YOUR code to insure that they supply parameters for each '%' in the format string.

There is not a built in way to check the number of arguments pushed on the stack for a call.

There is a messy way to do this, but it involves modifying all code that calls SetErrorInfo, and this amounts to the same effort (only more so) as to examine all the calls to SetErrorInfo. You could drop into ASM and push a flag value (__ASM mov eax,0x012345678 __ASM push eax) just before making the call to SetErrorInfo, make the call, then erase the flag upon return by dropping into ASM again (__ASM add esp,4). Inside SetErrorInfo you could examine the stack by dropping into ASM and check if the flag value immediately followed the format or was found too close to the format argument for the number of '%' characters in the format string. First you have to verify that a format string has actually been passed (and not a NULL argument), then that the string contains % characters, etc, etc, etc. Messy, messy, messy! Just examine all calls to SetErrorInfo.

Dave.

I have to insert value into table at runtime ?

jadhavjitendrar14-Sep-09 0:26

jadhavjitendrar

14-Sep-09 0:26

CSting strid = m_strStringArr.getat(i);
T("INSERT INTO tablename (setid) VALUES('strAnsi')");

This is my query and i get table field and its value at runtime.So how to insert this value.any idea about it..means Setid and stransi i get at runtime..

modified on Monday, September 14, 2009 6:37 AM

Re: I have to insert value into table at runtime ?

«_Superman_»14-Sep-09 0:44

«_Superman_»

14-Sep-09 0:44

Use CString::Format[^] to create the string.

CString cs;
cs.Format(_T("INSERT INTO tablename (%s) VALUES('%s')"), setid, strAnsi);

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

Re: I have to insert value into table at runtime ?

jadhavjitendrar14-Sep-09 0:48

jadhavjitendrar

14-Sep-09 0:48

It Works..

Thanks Superman

Re: I have to insert value into table at runtime ?

jadhavjitendrar14-Sep-09 2:24

jadhavjitendrar

14-Sep-09 2:24

But after set this data to fields,every fields ti goes into new line.i dont want this.I want after new line it goes to next line or next record.So how to solve this problem..

Re: I have to insert value into table at runtime ?

norish14-Sep-09 8:30

norish

14-Sep-09 8:30

When strAnsi has _T("aaa\nbbb\nccc") then want to make 3 records?
Do you mean like this?

If then, you must split strAnsi at first and make and execute sql 3 times.

For example;

TCHAR* strData = strAnsi.GetBuffer(-1);
TCHAR* pToken = _tcstok(strAnsi, _T("\n"));
while (pToken) {
  CString sql;
  sql.Format(_T("INSERT INTO tablename (%s) VALUES('%s')"), setid, pToken);
  // execute SQL here
}
strAnsi.ReleaseBuffer();

Well, I dont feel good VALUES('%s') in above sql because of string
escaping issue or SQL-injection problems.
I usually use prepared statements or parameterized query for this purpose.

Re: I have to insert value into table at runtime ?

CPallini14-Sep-09 0:45

CPallini

14-Sep-09 0:45

Do you really OMG | :OMG:

mean this

CString strTable = _T("MyRuntimeValueForTable");
CString strData = _T("MyRuntimeValueForData");

CString strQuery;
strQuery.Format(_T("INSERT INTO %s VALUES ('%s')"), strTable, strData);

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]

need help for programming PTZ camera

rajapp13-Sep-09 23:09

rajapp

13-Sep-09 23:09

hi,
please anyone help me in programming ptz camera query and response commands. pan tilt zoom functionalities are all done but I dont know how to get the angles from ptz camera.I tryed to give the query command and response but have some problem and I dont know how to use this commands of protoocol in c++.. I am using pelco D protocol. please help Confused | :confused:

Cut Rectangles in images

Game-point13-Sep-09 22:14

Game-point

13-Sep-09 22:14

Hi
How to cut rectangles in images ..in dialog based application

thanks and regards

~~~~~~~~~~~~~Raju~~~~~~~~~~~~~

Re: Cut Rectangles in images

CPallini13-Sep-09 22:55

CPallini

13-Sep-09 22:55

See here.
Smile | :)

Re: Cut Rectangles in images

Game-point13-Sep-09 23:26

Game-point

13-Sep-09 23:26

thanks 4 ...your replay

CImage _cImage;
	_cImage.Load(_T("D:/2009ga.jpg"));
	/*
	x1 = 9175
	y1 = 631
	x2 = 10563
	y2 = 65
	*/
	CRect rect(9175,631,10563,65);
	_cImage.Draw(NULL,rect);
	_cImage.Save(_T("D:/tct.jpg"));

but the result showing the same image of 2009ga.jpg

~~~~~~~~~~~~~Raju~~~~~~~~~~~~~

HOw can run vlc code

anishkannan13-Sep-09 21:23

anishkannan

13-Sep-09 21:23

Hi..

New in c++ application... Now i need play video.. i got Vlc code from corresponding VLC Site.. which have c and c++ code ... I want run that code ... How can i run that project... Which Software we use...

Thanks

Re: HOw can run vlc code

CPallini13-Sep-09 21:48

CPallini

13-Sep-09 21:48

Have a look at [^].
Smile | :)

Re: HOw can run vlc code

Michael Schubert13-Sep-09 21:52

Michael Schubert

13-Sep-09 21:52

anishkannan wrote:
Hi..

New in c++ application... Now i need play video.. i got Vlc code from corresponding VLC Site.. which have c and c++ code ... I want run that code ... How can i run that project... Which Software we use...

Thanks

The only response I could think of:
Liquid-Nitrogen[^]

Re: HOw can run vlc code

enhzflep14-Sep-09 4:18

enhzflep

14-Sep-09 4:18

Outstanding!
Just to let you know where the 5 is from....

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