C / C++ / MFC

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

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

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

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

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

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

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

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

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

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

29-Jul-07 21:41

Thanks CPallini!

What do you mean "generic text mapping"?

regards,
George

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

29-Jul-07 23:53

Thanks CPallini,

Good resource.

regards,
George

Mathematics library

Shashi.Shinde29-Jul-07 20:55

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

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?

Shashi.Shinde29-Jul-07 21:31

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

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?

Shouvik Das29-Jul-07 23:43

Shouvik Das

29-Jul-07 23:43

Why not use MATLAB. You can integrate MATLAB very well with C/C++.

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

Shashi.Shinde30-Jul-07 0:06

30-Jul-07 0:06

Dear Sir,
Thanks for suggestion.

With regards,

Shashikant

beko29-Jul-07 23:59

beko

29-Jul-07 23:59

Check MTL (Matrix Template Library)
Check TNT and JAMA

Hope this helps

Shashi.Shinde30-Jul-07 0:06

30-Jul-07 0:06

Dear Sir,
Thanks for suggestion.

With regards,

Shashikant

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer30-Jul-07 1:01

30-Jul-07 1:01

Do you have a URL for the MTL? My google search found lots of academic bits talking about it, but not the home itself.

I've rolled my own, but it would be good to have an external one for use too.

Iain.

Shashi.Shinde30-Jul-07 1:18

30-Jul-07 1:18

Dear Sir,
Thanks for suggestion.

With regards,

Shashikant

Nemanja Trifunovic30-Jul-07 2:40

Nemanja Trifunovic

30-Jul-07 2:40

Boost uBLAS[^] may be what you need.

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