Re: access violation when trying to use fwrite() - C / C++ / MFC Discussion Boards

Ray Cassick11-Mar-03 10:40

11-Mar-03 10:40

main () {
  for ( ; ; ) {
    printf ("Hung up\t\b\b\b\b\b\b") ;
  }
}

Paul Watson wrote:
"At the end of the day it is what you produce that counts, not how many doctorates you have on the wall."
George Carlin wrote:
"Don't sweat the petty things, and don't pet the sweaty things."
Unknown wrote:
"I love long walks, especialy taken by those that annoy me."
Paraphrased from TMNT:
"Cricket? You have to know what a crumpet is to understand Cricket."

Re: Anyone explain why this causes a BSOD?

Christian Graus11-Mar-03 10:47

Christian Graus

11-Mar-03 10:47

Yeah, this has been discussed many times. I think the backspaces go past the beginning of the line because of a problem with how tabs are accounted for.

Christian

NO MATTER HOW MUCH BIG IS THE WORD SIZE ,THE DATA MUCT BE TRANSPORTED INTO THE CPU. - Vinod Sharma

Anonymous wrote:
OK. I read a c++ book. Or...a bit of it anyway. I'm sick of that evil looking console window.

I think you are a good candidate for Visual Basic. - Nemanja Trifunovic

Re: Anyone explain why this causes a BSOD?

David Wulff11-Mar-03 11:03

David Wulff

11-Mar-03 11:03

No no you've got it all wrong - you are supposed to post it with the title "This is the answer to your homework"... Roll eyes | :rolleyes:

David Wulff

"David Wulff can't live without me, so you shouldn't either" - Paul Watson

Re: Anyone explain why this causes a BSOD?

Ray Cassick11-Mar-03 11:10

Ray Cassick

11-Mar-03 11:10

Um... sorry... wrong... not homework. I found it ont he Internet because I was searching for a way to induce a BSOD for some testing I am doing but did not understand WHY it worked.

I Figured that it had something to do with the way it revereses through the buffer, but I could not understand why the tab had anything to do with it.

Re: Anyone explain why this causes a BSOD?

David Wulff11-Mar-03 11:20

David Wulff

11-Mar-03 11:20

No no no no no no no - not you posting a homework question, but rather you posting an answer to all the people who are posting homework questions. Get it now? Unsure | :~

David Wulff

"David Wulff can't live without me, so you shouldn't either" - Paul Watson

Re: Anyone explain why this causes a BSOD?

Ray Cassick11-Mar-03 11:29

Ray Cassick

11-Mar-03 11:29

Yes I get it.... Smile | :)

I have found it... the elusive registry key that makes Windows crash..

http://support.microsoft.com/?kbid=244139[^]

This is so funny I can't wait to try it out.

access violation when trying to use fwrite()

Kuniva11-Mar-03 9:36

Kuniva

11-Mar-03 9:36

I wrote a function to write an integer to a file (i also wrote a function to write a string to a file, which works almost exactly the same way) but windows gives me an access violation error on it or something (the string function works fine btw, so its not the file mode etc.).
Here's the code:

int WriteInt(int Int, long pos)
{
    if(fseek(npf, pos, SEEK_SET))
    {
        return -1;
    }
    int numwritten = fwrite((void*)Int, sizeof(int), 1, npf);
    if(numwritten!=1)
    {
        return -1;
    }
    return 1;
}

npf is a valid open file stream to which i CAN write strings etc.
Any ideas why this wont work?

Kuniva
--------------------------------------------

Re: access violation when trying to use fwrite()

Dave Bryant11-Mar-03 9:41

Dave Bryant

11-Mar-03 9:41

Kuniva wrote:
int numwritten = fwrite((void*)Int, sizeof(int), 1, npf);

You are converting an integer to a memory address - so it will try to read from the address of the value currently in Int. Try:

int numwritten = fwrite(&Int), sizeof(int), 1, npf);

Dave

Re: access violation when trying to use fwrite()

Kuniva11-Mar-03 9:50

Kuniva

11-Mar-03 9:50

thanks, it solved my problem Wink | ;)

Kuniva
--------------------------------------------

CF_HTML (HTML Format)

Kant11-Mar-03 9:34

Kant

11-Mar-03 9:34

I am looking for a sample where you can paste in HTML format.

I got Rich Edit control and strData contains like this
{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 MS Sans Serif;}}
\viewkind4\uc1\pard\f0\fs17
\par \b Test\b0
\par

What I am expecting is like this:
< HTML > (intended spaces there)

< B >Test < / B> (intended spaces there)

< / HTML> (intended spaces there)

Code from Copy to Clipboard function:

UINT format = ::RegisterClipboardFormat("HTML Format");<br />
<br />
if (strData.IsEmpty())<br />
  return;<br />
<br />
CSharedFile sf(GMEM_MOVEABLE|GMEM_SHARE|GMEM_ZEROINIT);<br />
sf.Write(strData, strData.GetLength() * sizeof(TCHAR));<br />
<br />
if (!OpenClipboard())<br />
  return;<br />
<br />
EmptyClipboard();<br />
	    <br />
SetClipboardData(format, sf.Detach());<br />
<br />
CloseClipboard();

But when I paste into another control(Edit), all I get is RTF only.
Do I need to convert from RTF format to HTML format?? Confused | :confused:

If yes, then what's the use of CF_HTML("HTML Format") parameter??

Kant

Re: CF_HTML (HTML Format)

Brian Shifrin11-Mar-03 16:40

Brian Shifrin

11-Mar-03 16:40

DevStudio includes utility DataObjectViewer to allow you play with Clipboard.... (Enum Formats etc ).

I belive RichEdit does not support CF_HTML.

Decimal Symbol

Haakon S.11-Mar-03 9:12

Haakon S.

11-Mar-03 9:12

In my application there is a choice of two languages, Norwegian or English. They use different locales with comma or periode as decimal symbol, respectively. I'd like the decimal symbol on the numeric keypad to return the symbol which corresponds to the locale, whereas the comma/periode on the main keypad should remain unchanged. Excel has this functionality

I guess I should put an if() statement in OnChar(). I've noticed that the nFlags parameter in OnChar()is different if the decimal symbol is pressed from the numeric keypad or the main keypad, but I can't figure out how to interpret it. MSDN also has a statement that applications can not extract usefull information from nFlags. So, any tips..?

Regards, Haakon S.

Re: Decimal Symbol

brianwelsch12-Mar-03 9:47

brianwelsch

12-Mar-03 9:47

I'm not sure, but the following might work.

in ::PreTranslateMessage()

if((pMsg->Message == WM_CHAR && pMsg->wParam == xx) && m_bNorwegian)
{
AfxGetMainWnd()->PostMessage(WM_CHAR, VK_COMMA);
return true;
}

where:
xx is the number corresponding to numeric period key. You can get this with a quick debug session.
m_bNorwegian is your flag to know which language your in.

I'm new to this stuff, but it seems like it would work.

BW
"We get general information and specific information, but none of the specific information talks about time, place or methods or means..."
- Tom Ridge - US Secretary of Homeland Security

Re: Decimal Symbol

Haakon S.12-Mar-03 11:09

Haakon S.

12-Mar-03 11:09

Well, on my keypad the decimal symbol (numeric period) is comma, not period. But it is an interesting approach, I'll try it. Thank you for your help.

Regards, Haakon S.

Runners live two years longer. But those two years they spend running.

Re: Decimal Symbol

PJ Arends12-Mar-03 10:08

PJ Arends

12-Mar-03 10:08

Haakon S. wrote:
I can't figure out how to interpret it

Every key on the keyboard has a unique scan code. You can retrieve that code from the bits 0 to 15 of the nFlags parameter. IIRC the scan codes for the main keypad are standard, but all other keys are OEM specific, they are not guaranteed to be the same across all systems.

UINT scancode = nFlags & 0xFF;

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: Decimal Symbol

Haakon S.12-Mar-03 10:59

Haakon S.

12-Mar-03 10:59

PJ Arends wrote:
You can retrieve that code from the bits 0 to 15 of the nFlags parameter

But MSDN reads, under OnChar():

"Value 0-15
Specifies the repeat count. The value is the number of times the keystroke is repeated as a result of the user holding down the key."

If you look up under OnKeyDown(), you'll see a description more in line with yours, but it also says that the scan codes are OEM specific. However, I'll try to dig into this. If Excel can do it, so can I.

Thanks alot, anyway.

Haakon S.

Runners live two years longer. But those two years they spend running.

mfc ActiveX control install issue

work_to_live11-Mar-03 9:04

work_to_live

11-Mar-03 9:04

Not sure if this belongs here or in the COM discussion. Since I created an mfc ActiveX control with the mfc ActiveX Wizard, I'll try here...

I created my first ActiveX control, and successfully installed it on my machine with
regsvr32 "my controls name"

Then I fired up VB and verified that I could use the control in a VB application. I was fat dumb and happy. To test it, I sent the .ocx file to a friend and had him put it in C:\temp. (The controls name is transponder.ocx)

I had him execute the following from "Start" "Run"...

regsvr32 C:\temp\transponder.ocx

When he executed the command, he got the following error...
Load Library
“C:\temp\transponder.ocx” failed – the specified module could not be found.

Any idea what this is trying to tell me? I set up the project as a static build, so I don't think it's looking for any dlls.

Re: mfc ActiveX control install issue

Dave Bryant11-Mar-03 9:38

Dave Bryant

11-Mar-03 9:38

Use dependancy walker to see what DLLs it does need. Even if it is statically linked to MFC, it may still require the C-runtime DLLs (e.g. msvcrt.dll).

Dave

Re: mfc ActiveX control install issue

work_to_live11-Mar-03 11:59

work_to_live

11-Mar-03 11:59

WOW...
According to dependency walker, it requires the following...
kernel32.dll, user32.dll, gdi32.dll, comdlg32.dll, winspool.drv, advapi32.dll, shell32.dll, comctl32.dll, ole32.dll, olepro32.dll, oleaut32.dll at the first level
Then each of them has a list!

Is it necessary to include all these in an install utility?

Does one of these look like a good candidate for something that's not typically loaded in a Win2000 installation?

Thanks!

Passing Variables from Macromedia Director to C++

moojuice11-Mar-03 9:03

moojuice

11-Mar-03 9:03

Hello,

I was wondering if it was possible to pass variables from Macromedia Director into a C++ programme? It can be done rather easily using Flash (from the look of things) but I need to be able to do it in Director. I have searched the web and very little is mentioned. Any help would be greatly appreciated.

Regards,

Moo

Re: Passing Variables from Macromedia Director to C++

moojuice13-Mar-03 7:24

moojuice

13-Mar-03 7:24

Any one have any ideas about it?

Does this code leaks memory?

Joan M11-Mar-03 8:49

Joan M

11-Mar-03 8:49

Hello,

I'm debugging my last program... and today I've acquired Rational Purify (trial version) in order to receive help on this task...

after running my program under Rational Purify, I've found some memory leaks... but now I'm not sure of which is my name (almost)...

let's see, it says that this code is leaking memory:
-------------------------------------------------------------
-------------------------------------------------------------
// Variables que permeten la construcció del codi HTML.
CString csCodiHTML = "HTML STRING...";
BSTR bstr;

int iWidthAreaClientHTMLCtrl = 0;

// Tractament del SafeArray.
HRESULT hrTractarAmbSafeArray = S_OK;

SAFEARRAY *pSafeArray = NULL;
VARIANT *pElement = NULL;

extern CTCCApp TCCApp;

//------------------------------------------------
// Obtenir accés al control HTML via ATL.
//------------------------------------------------
CComQIPtr<IHTMLDocument2> spHTMLDocument = this->m_HTMLCtrl.GetHtmlDocument();

if(spHTMLDocument)
{
CComQIPtr<IHTMLElement> spHTML;

spHTMLDocument->get_body(&spHTML);

if (spHTML)
{
bstr = csCodiHTML.AllocSysString();

spHTML->put_innerHTML(bstr);

spHTML.Release();

SysFreeString(bstr);
csCodiHTML.ReleaseBuffer();
csCodiHTML.FreeExtra();
}
else
{
pSafeArray = ::SafeArrayCreateVector(VT_VARIANT, 0, 1);

if (pSafeArray)
{
hrTractarAmbSafeArray = ::SafeArrayAccessData(pSafeArray,(LPVOID*) &pElement);

pElement->vt = VT_BSTR; // HERE!
pElement->bstrVal = csCodiHTML.AllocSysString();

hrTractarAmbSafeArray = ::SafeArrayUnaccessData(pSafeArray);

hrTractarAmbSafeArray = spHTMLDocument->write(pSafeArray);

::SafeArrayDestroy(pSafeArray);

csCodiHTML.ReleaseBuffer(); // HERE TOO!
csCodiHTML.FreeExtra();
}
}
}

if (spHTMLDocument) spHTMLDocument.Release();
-------------------------------------------------------------
-------------------------------------------------------------
Where you can see HERE! and HERE TOO! is where that program Rational purify is detecting some memory leaks... do you think that the code is leaking memory?

and if so... why? I thought that if I have not called new I should'nt call delete and that whenever the function goes out of scope the local variables are destructed automatically... isn't it true?

Thank you in advance...

Re: Does this code leaks memory?

Tim Smith11-Mar-03 8:56

Tim Smith

11-Mar-03 8:56