Re: please help me ineed this - C / C++ / MFC Discussion Boards

Re: please help me ineed this

p_29-Jul-07 22:55

29-Jul-07 22:55

sorry sir
but sir i dont got my solution

Re: please help me ineed this

Hans Dietrich29-Jul-07 23:01

Hans Dietrich

29-Jul-07 23:01

That's no excuse for acting like a whiney brat. If someone with experience sees your question, they will post an answer. If you post over and over, they will get annoyed, and might ignore your question. So be patient.

Best wishes,
Hans

[CodeProject Forum Guidelines] [How To Ask A Question] [My Articles]

Re: please help me ineed this

Jonathan [Darka]30-Jul-07 0:16

Jonathan [Darka]

30-Jul-07 0:16

We already did, he seems unwilling to debug or try anything to identify the problem.

The issue is not the NULL recordset, but a combination of dodgy error handling and a refusal to look into why he is getting NULL from the query.

Jonathan Wilkes
Darka[Xanya.net]

Re: please help me ineed this

Shouvik Das29-Jul-07 23:41

Shouvik Das

29-Jul-07 23:41

I think this is a reposting of your previous query. Is the earlier thread not providing you any solution. I think it is the same problem. Your recordset is not returned instead just NULL is there so you end up with an Access Violation Error.

Have you debugged the application after necessary changes were made to it?

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: please help me ineed this

Jonathan [Darka]30-Jul-07 0:11

Jonathan [Darka]

30-Jul-07 0:11

He's basically ignored everything we suggested in the original question.

I will not help anymore as he could find the problem in 2 seconds using the debugger.

regards,

Jonathan Wilkes
Darka[Xanya.net]

Re: please help me ineed this

Shouvik Das30-Jul-07 0:13

Shouvik Das

30-Jul-07 0:13

if that is the case I go with you. We are not dumb fools replying to people who are deaf.

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: please help me ineed this

Jonathan [Darka]30-Jul-07 0:13

Jonathan [Darka]

30-Jul-07 0:13

So did you try what we suggested in your original question ?

You really should learn how to use the debugger, this would take seconds to find.

I've already told you why it's crashing, try debugging it to see why you are getting no records back.

regards,

Jonathan Wilkes
Darka[Xanya.net]

Re: please help me ineed this

David Crow30-Jul-07 3:46

David Crow

30-Jul-07 3:46

This same "use the debugger" problem has plagued you since 3-July. You don't appear to be trying anything new. When a suggestion is made, it usually narrows the problem down a bit further each time.

When you call a function that returns a value, it would behoove you to check that value to make sure the function call succeeded. Proceeding regardless is just asking for trouble.

http://www.codeproject.com/script/comments/forums.asp?msg=2109077&forumid=1647&mode=all&userid=3075912#xx2109077xx[^]

http://www.codeproject.com/script/comments/forums.asp?msg=2136812&forumid=1647&mode=all&userid=3075912#xx2136812xx[^]

http://www.codeproject.com/script/comments/forums.asp?msg=2139256&forumid=1647&mode=all&userid=3075912#xx2139256xx[^]

http://www.codeproject.com/script/comments/forums.asp?msg=2141720&forumid=1647&mode=all&userid=3075912#xx2141720xx[^]

http://www.codeproject.com/script/comments/forums.asp?msg=2147363&forumid=1647&mode=all&userid=3075912#xx2147363xx[^]

http://www.codeproject.com/script/comments/forums.asp?msg=2157231&forumid=1647&mode=all&userid=3075912#xx2157231xx[^]

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

How this expression get's executed

hari prasad sathpadi29-Jul-07 21:03

hari prasad sathpadi

29-Jul-07 21:03

can any one explain the sequence steps how x value changes.
i.e expand the below expression for easy understanding

x=x++ + ++x + ++x + --x;
printf("%d",x);

y=x++ + ++x + ++x + --x;
printf("%d",x);
printf("%d",y);

I executed this exp in vc++ i got 1st exp values as x=14
and in second exp i got x=4 and y=13.

sorry i got y=13;

Re: How this expression get's executed

Matthew Faithfull29-Jul-07 21:17

Matthew Faithfull

29-Jul-07 21:17

The difference between y = 13 and x = 14 is because of the postfix operator on x, x++
This get evaluated after the result is assigned to y. Simplify the expresion to see what is happening.

x= 4;
x = x++;
x == 5;

x = 4;
y = x++;
x == 5;
y == 4;

4 is assigned to y before x is incremented.

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: How this expression get's executed

Nelek29-Jul-07 21:17

Nelek

29-Jul-07 21:17

And you have no other line modifying or reseting "x" ??? Just this code?

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: How this expression get's executed

Jonathan [Darka]29-Jul-07 22:10

Jonathan [Darka]

29-Jul-07 22:10

Stop reposting.

Jonathan Wilkes
Darka[Xanya.net]

pass multi-byte (or wide) characters to DeleteFile

George_George29-Jul-07 20:58

George_George

29-Jul-07 20:58

Hello everyone,

The prototype of DeleteFile is,

BOOL WINAPI DeleteFile(
LPCTSTR lpFileName
);

I am wondering if the input parameter (string) is multi-byte characters or wide characters, how should I pass them in? Do I need to do any conversions?

thanks in advance,
George

Re: pass multi-byte (or wide) characters to DeleteFile

Matthew Faithfull29-Jul-07 21:12

Matthew Faithfull

29-Jul-07 21:12

George_George wrote:
BOOL WINAPI DeleteFile(
LPCTSTR lpFileName
);

The input parameter is of type const TCHAR*. TCHAR is defined in winnt.h as WCHAR if UNICODE is defined or char otherwise. My advise is therefore to pass a TCHAR pointer and you can't go wrong.

<br />
LPCTSTR lpFileName = _T( "C:\\Temp\\someFile" );<br />
::DeleteFile( lpFileName );<br />

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: pass multi-byte (or wide) characters to DeleteFile

George_George29-Jul-07 21:31

George_George

29-Jul-07 21:31

Thanks Matthew,

I think in my situation I do not need to care whether I passed multi-byte character or wide character to DeleteFile, since LPCTSTR is adaptive to multi-byte character or wide character according to the settings of UNICODE macro. Right?

regards,
George

Re: pass multi-byte (or wide) characters to DeleteFile

CPallini29-Jul-07 21:24

CPallini

29-Jul-07 21:24

LPCTSTR is a generic-taxt-mapping type:
(1) if your build is UNICODE (_UNICODE symbol defined) then the string is a wide-character one.
(2) On the other hand, if your build in ANSI or DBCS then LPTCSTR is defined as const char *.

N.B.
Visual Studio .NET, as default, targets its builds to UNICODE (Visual Studio 6 has the opposite default behaviour).

Hope that helps
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.

Re: pass multi-byte (or wide) characters to DeleteFile

George_George29-Jul-07 21:30

George_George

29-Jul-07 21:30

Thanks CPallini,

I think in my situation I do not need to care whether I passed multi-byte character or wide character to DeleteFile, since LPCTSTR is adaptive to multi-byte character or wide character according to the settings of UNICODE macro. Right?

regards,
George

Re: pass multi-byte (or wide) characters to DeleteFile

CPallini29-Jul-07 21:36

CPallini

29-Jul-07 21:36

Right only if you use generic text mapping strings, as suggested by Matthew Faithfull.
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.

Re: pass multi-byte (or wide) characters to DeleteFile

George_George29-Jul-07 21:41

George_George

29-Jul-07 21:41

Thanks CPallini!

What do you mean "generic text mapping"?

regards,
George

Re: pass multi-byte (or wide) characters to DeleteFile

CPallini29-Jul-07 21:51

CPallini

29-Jul-07 21:51

Basically, follow Matthew Faithfull suggestion, for an example, see here http://msdn2.microsoft.com/en-us/library/4t912wf5(vs.80).aspx[^].
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.

Re: pass multi-byte (or wide) characters to DeleteFile

George_George29-Jul-07 23:53

George_George

29-Jul-07 23:53

Thanks CPallini,

Good resource.

regards,
George

Mathematics library

Shashi.Shinde29-Jul-07 20:55

Shashi.Shinde

29-Jul-07 20:55

Hello masters,
I've to do some mathematical operations on Matrices & arrays on large number of elements using C++. I like to mention some of main functions which I've to use -
matrix multliplication,
matrix inverse,
sorting on arrays,
Finding min / max from the list / arrays, etc.

I find there are number of libraries on the internet. So that I like to use some maths libraries.

So request you to suggest me the neccessary information about the higher performance maths library.

Thanks & regards,
Shashikant

Re: Mathematics library

Nelek29-Jul-07 21:15

Nelek

29-Jul-07 21:15

The best option is check those libs out and choose the one that has what you need. But I thing there is not any operation you need in the standard "math.h" and "math.lib". Anyways... they are not difficult. Every operation from the list can be solved programmng your own functions with in a short code. I.E.

Matrix Multiplication

double A[M1][N1];
double B[M2][N2];
double C[M3][N3];

//I suppose A and B are already with datas inside
//(m1 x n1) x (m2, n2) = (m1 x n2) dimension of matrix, where n1 and m2 have to be the same
void Mult_Matrix (int m1, int n1, int m2, int n2) 
{	int i = 0, j = 0, k = 0;
	if (n1 != m2) //Matrix can't be multiplied
		return; 

	for (i = 0; i < m1; i++)
	{
		for (j = 0; j < n2; j++)
		{
			while (k < n1)
				C[i][j] += A[i][k] * B[k][j];
		}
	}
}

And the rest are to be not difficult. By the way... I have done it in the samplest way. You can give a pointer to your class CMatrix as return, give error messages and so on... It depends on what you need/want to do. Try it and ask if you have problems, we'll help you.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: Mathematics library

Shashi.Shinde29-Jul-07 21:31

Shashi.Shinde

29-Jul-07 21:31

Thnaks U Nelek,

As per ur suggestion, I had already implemented & verified listed operations, but our client wanna standard libraries about the same. So that I requires the libraries for the same routine.

Client is interested in libraries coz there are lacs of data elements in matrices & we've to operate on it.

So request you to inform me about higher performance math libs.

Thanks & regards,

Shashikant

Re: Mathematics library

Nelek29-Jul-07 21:46

Nelek

29-Jul-07 21:46

Sorry but i can not help you with it. I usually made my own functions, because the most of the times there are always some particularities that made the libs useless for me. So I don't know much about libs and so on.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

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