C / C++ / MFC Discussion Boards

Snoepie27-Apr-09 8:28

27-Apr-09 8:28

the call doesn't complete..... The bytecount written is correct, but the memory addressed by the call stays empty.
Also in MSDN is stated that a Write call my fail whilst still returning no fail error code.

After doing a sendmessage LVM_GetItemState to listView, the call returns empty as well.

So the memory location seems to be inacessible, which is bizarre because i also have this:

lvi.pszText=_item;
WriteProcessMemory(lView, _lvi, &lvi, sizeof(LVITEM), NULL);
SendMessage(listView, LVM_GETITEMTEXT, NULL, (LPARAM)_lvi);
ReadProcessMemory(lView, _item, item, 512, NULL);

and that returns with the correct itemtext......

Re: WriteProcessMemory error 5

Luc Pattyn27-Apr-09 8:17

Luc Pattyn

27-Apr-09 8:17

GetLastError() returns the last error that occurred, which didn't necessarily happen in the last function call. That is way it is called GetLastError() and not GetError().

You normally want to stop a sequence of operations at the first error, so you could and should structure your code like this:

result=callFunction1();
if (result==OK) result=callFunction2();
if (result==OK) result=callFunction3();
if (result!=OK) log("it went wrong; error = ", GetLastError());

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Re: WriteProcessMemory error 5

Snoepie27-Apr-09 8:29

Snoepie

27-Apr-09 8:29

tnx for the input, but the original code is spiked with GetLastErrors, took some out to shorten code for viewing.

Re: WriteProcessMemory error 5

Luc Pattyn27-Apr-09 8:50

Luc Pattyn

27-Apr-09 8:50

Yeah, great. When the error handling code indicates some problem, show us fictitious code. Someone will make the right guess anyhow?

Unsure | :~

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Re: WriteProcessMemory error 5

CPallini27-Apr-09 22:36

CPallini

27-Apr-09 22:36

They must protect their brilliant code against industrial espionage, my friend.
Roll eyes | :rolleyes:

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: WriteProcessMemory error 5

Snoepie29-Apr-09 5:50

Snoepie

29-Apr-09 5:50

found it:

Microsoft Windows Vista and later. When a message is blocked by UIPI the last error, retrieved with GetLastError, is set to 5 (access denied).

took me a full week to discover this tidbit. Tnx MS

Re: WriteProcessMemory error 5

CPallini29-Apr-09 6:33

CPallini

29-Apr-09 6:33

Good: tenacity wins, eventually.
Smile | :)

Please help with thisBasic C Program

biggiant2200027-Apr-09 5:45

biggiant22000

27-Apr-09 5:45

I need help with a programto keep records and perform statistical analysis for a class of students.
the class has 40 students, there are 5 quizzes, and each student identified by a 4 digit student number

Re: Please help with thisBasic C Program [modified]

CPallini27-Apr-09 6:38

CPallini

27-Apr-09 6:38

This is homework, the rules of the homework game, here, are:

we don't do homework.
Try to do some work yourself.
If you're stuck, try harder.
If point (3) did'n work for you, read carefully post guidelines [^] and then post in this forum.

[added]
Mr.Univoter deadlock on point (3). Poke tongue | ;-P

[/added]

modified on Wednesday, April 29, 2009 12:44 PM

Re: Please help with thisBasic C Program

David Crow27-Apr-09 8:10

David Crow

27-Apr-09 8:10

biggiant22000 wrote:
I need help with a programto keep...

Change this to "program to" and you should be good to go. Thanks for allowing us to help.

"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: Please help with thisBasic C Program

CPallini27-Apr-09 10:46

CPallini

27-Apr-09 10:46

CHTMLEdView hides cursor

William Engberts27-Apr-09 5:33

William Engberts

27-Apr-09 5:33

Hi all,

I have written a CMS that uses the CHTMLEdView class as a HTML editor. The CMS also has a number of additional edit controls for things like a button name, a tooltip etc. When the CHTMLEdView has focus, and I click on one of the other Edit controls, then the cursor is hidden, which is a hassle for editting. When I then click on any of the other edit controls, the cursor re-appears, In other words, I always need to click two different edit controls after using the HTML editor before the cursor appears again. I have tried ShowCursor(TRUE) and ShowCaret() on the edit controls, but nothing seems to help. Has anybody got any ideas on the subject? Would be greatly appreciated.

Regards,
William

How to code a math formula and pass it to a 'weird' function

Episodio127-Apr-09 4:55

Episodio1

27-Apr-09 4:55

hi!

I want to use a C++ function which applies minimization on a math formula ( http://www.codecogs.com/d-ox/maths/optimization/nelder.php ) but I dont understand how to pass my formula as the first parameter.

There is even an example but I dont understand it...

double f(double *x) {
    double r = sqrt(x[0] * x[0] + x[1] * x[1]);
    return ABS(r) < 1E-12 ? 1 : sin(r) / r;
}

I dont know what's the unknown. "x"? "r"? Both?

My formula is: http://personal.telefonica.terra.es/web/episodio1/text3.gif

This is what I've made:

for (i=1;i<=numberOfAnchors;i++)
{
   errorsquare+= pow( abs( x[i] - xestim + y[i] - yestim ) - distance[i]  ) , 2 );
}
errorsquare=errorsquare/numberOfAnchors;

2 unknowns: "xestim" and "yestim".

My question is: how should I code/declare my formula so it is accepted by the C++ function ?

Thanks.

Re: How to code a math formula and pass it to a 'weird' function

CPallini27-Apr-09 6:31

CPallini

27-Apr-09 6:31

Well, supposing both your xestim and yestim are independent, you may rearrange your function such a way:

xestim -> z[0]
yestim -> z[1]

so that you'll get

double f (double * z)
{
  errorsquare = 0.0;
  for (i=1;i<=numberOfAnchors; i++)
  {
    errorsquare+= pow( abs( x[i] - z[0] + y[i] - z[1] ) - distance[i]  ) , 2 );
  }
  return errorsquare;
}

Now you have the f parameter of the nelder function..
dim is 2 (as you may guess).
The starting simplex points p are up to you (you've to provide, as in the example a 2x3 array), like the eps value and the maxit.

Smile | :)

Re: How to code a math formula and pass it to a 'weird' function

Episodio127-Apr-09 7:56

Episodio1

27-Apr-09 7:56

Thanks, Cpallini...

I guess u removed by mistake...

errorsquare=errorsquare/numberOfAnchors ;

)

Re: How to code a math formula and pass it to a 'weird' function

CPallini27-Apr-09 9:25

CPallini

27-Apr-09 9:25

Episodio1 wrote:
I guess u removed by mistake...

Of course I forgot it, but you know, such a operation has no influence in finding minimum (you may drop it). Wink | ;)

Re: Cpallini, do you know about NelderMead algorithm? [modified]

Episodio127-Apr-09 12:39

Episodio1

27-Apr-09 12:39

Cpallini, do you know about NelderMead algorithm?

Cause I dont know what initial points to use. I mean...

In that C++ function Points are 2x3 (3 points x-y).

But this function is payware, so I got this one: http://people.sc.fsu.edu/~burkardt/cpp_src/asa047/asa047.html

In this last one initial points are only 1x2, which I dont know what represents.

Code it's already running but I dont get valid points for any initial points. Frown | :(

EDIT: It's OK now. There would be 1 and only initial point. And it should be close to region in which I want to find a minimum. ^^

modified on Monday, April 27, 2009 7:10 PM

help me!!

yunpil27-Apr-09 4:39

yunpil

27-Apr-09 4:39

Receiving gps coordinate to web browser laziness program

By the way, coordinate is not carried cost

Teach where is done wrongly

source down

Re: help me!!

Cedric Moonen27-Apr-09 4:43

Cedric Moonen

27-Apr-09 4:43

yunpil wrote:
laziness program

At least you are consistent with that...

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: help me!!

David Crow27-Apr-09 4:51

David Crow

27-Apr-09 4:51

I remember walking in the park one day and... Roll eyes | :rolleyes:

Wait, wrong story.

I have sent you the requested code. I wrapped it in a plain brown sack for your privacy. When you are done with it, please mail it back to me. Enjoy.

copy File/Folder

MsmVc27-Apr-09 2:51

MsmVc

27-Apr-09 2:51

Hi All

I have two path source(LPCSTR pF)and destination(LPCSTR pT).I am getting values in pF at the run time like this pF="C:\\Hello\\adaf\\trt" and pT="C:\\Backup."
But when code start to copy cammand then it make backup but it's not make in proper way.It's make like that(C:\\Backup\\Hello,C:\\Backup\\adaf and C:\\Backup\\trt).But i need to copy in full path like that(C:\\Backup\\Hello\\adaf\\trt).I am ueing this code.

CFileOperation fo;
	CString tr=sourcepath;
			
 	int nLen = tr.GetLength();
		LPCSTR lpszBuf = tr.GetBuffer(nLen);
    	tr.ReleaseBuffer();
		LPCSTR pF=lpszBuf;
		
		LPCSTR pT="C:\\Backup";	
if(!fo.Copy(pF,pT));

Plz help me

Re: copy File/Folder

CPallini27-Apr-09 3:02

CPallini

27-Apr-09 3:02

MsmVc wrote:
CFileOperation

What is it?

MsmVc wrote:
int nLen = tr.GetLength();
LPCSTR lpszBuf = tr.GetBuffer(nLen);

Why are you misusing CString::GetBuffer?

Smile | :)

Re: copy File/Folder

KarstenK27-Apr-09 3:12

KarstenK

27-Apr-09 3:12

If you are use ;;ShellFileOperation you need to end the last file buffers with 2 (two) zero bytes. Read the docs from MS D'Oh! | :doh:

Press F1 for help or google it.
Greetings from Germany

Re: copy File/Folder

David Crow27-Apr-09 3:35

David Crow

27-Apr-09 3:35

What's wrong with:

CFileOperation fo;	
if (! fo.Copy(sourcepath, "C:\\Backup"))
    ;

That aside, have you stepped into the Copy() code to see when/how it is failing?

One dought

Deepu Antony27-Apr-09 2:38

Deepu Antony

27-Apr-09 2:38

Hi all

The framework calls OnKillFocus() member function immediately before losing the input focus.

Just like that is there is any function that we can override when the window regains the focus.

Thanks and regards
Deepu

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