C / C++ / MFC

will this cause resource leak?

15-Mar-02 3:36

How do you handle WM_PAINT?

Tomasz Sowinski -- http://www.shooltz.com

Re: CreateEx

Carlos Antollini15-Mar-02 3:39

Carlos Antollini

15-Mar-02 3:39

Do you need to overwrite the mesage OnPaint...

Reagards

Carlos Antollini.
Sonork ID 100.10529 cantollini

lucy15-Mar-02 2:56

lucy

15-Mar-02 2:56

Thank you for reviewing my code. Please tell me whether this will cause any resource leak. Thank you a lot for your time and help! Rose | [Rose]

void CMyView::OnDraw(CDC *pDC)
{
    CPen redBeaconPen;
    VERIFY(redBeaconPen.CreatePen(PS_SOLID, 1, RGB(255,0,0)));
    CPen * pOldPen = pDC->SelectObject(&redBeaconPen);
    pDC->SelectStockObject(HOLLOW_BRUSH);

    pDC->Ellipse(1, 1, 10, 10);

    pDC->SelectObject(pOldPen);
    // <== my concern is here, how should I delete redBeaconPen? Or windows will handle that for me in CPen's destructor?
}

Re: will this cause resource leak?

Tomasz Sowinski15-Mar-02 2:53

Re: will this cause resource leak?

15-Mar-02 2:53

redBeaconPen is not selected into pDC when its destructor calls ::DeleteObject. There will be no resource leak. Code is OK.

Tomasz Sowinski -- http://www.shooltz.com

lucy15-Mar-02 3:17

lucy

15-Mar-02 3:17

Thank you for your quick reply! Rose | [Rose]

A strange problem!

Davidlou15-Mar-02 2:18

Davidlou

15-Mar-02 2:18

Who has used the regexp object in system32\vbscipt.dll to parse the text string. I have tried it and make it work!
But i don't know why i can get only one match(that is the matches.GetCount()==1, even there are many exist. The next is my code:

void CInetSessionDlg::ParsePage(CString szPattern, CString szContent)
{
//m_regExp's declaration is on other place link this: IRegExp m_regExp;
//The class IMatchCollection and IMatch are both got from the tlb
//m_regExp = regExp;
try{
if(m_regExp.CreateDispatch(__uuidof(RegExp)) == FALSE)
{
AfxMessageBox("CreateDispatch Failed!");
return;
}
//IMatchCollection2 * temp;
m_regExp.SetIgnoreCase(TRUE);
m_regExp.SetPattern(LPCTSTR(szPattern));
if(m_regExp.Test(LPCSTR(szContent)))
{
//IMatchCollection2 matches=m_regExp.Execute(szContent);
ISubMatches matches = m_regExp.Execute(szContent);
for(long i = 0; i < matches.GetCount(); i++)
{
IMatch2 match = matches.GetItem(i);
//IMatch2 match = temp->GetItem(i);
CString strLink = match.GetValue();
m_cbHref.AddString(strLink);
}
}
}
catch(_com_error& e)
{
AfxMessageBox("Com Error occurred!" + e.Description());
return;
}
}

in this implementation file's header file:
i defined the RegExp(copied from the file RegExp.tlh got from vbscript.dll)
struct __declspec(uuid("3f4daca4-160d-11d2-a8e9-00104b365c9f"))
RegExp;
// [ default ] interface IRegExp2

Why? Who can tell me how to use vbscript.dll in VC++ 6.0

thanks a lot!

Sincerely, Davidlou
davidlou68@hotmail.com

Avoid Moving a window

parker_john15-Mar-02 2:17

parker_john

15-Mar-02 2:17

Hello all,
I'm trying to avoid users to move my window and I've tried to overload the DefWindowproc() and OnWndMsg() in order to catch the WM_MOVING message, but it's doesn't work. Do you have any idea about how to manage this matter?

Thanks you,

Confused | :confused:

parker john

Tomasz Sowinski15-Mar-02 2:19

15-Mar-02 2:19

This works for me:

UINT CMainFrame::OnNcHitTest(CPoint point) 
{
	UINT n = CFrameWnd::OnNcHitTest(point);
	if (HTCAPTION == n)
	{
		n = HTNOWHERE;
	}
	return n;
}

Tomasz Sowinski -- http://www.shooltz.com

Prem Kumar15-Mar-02 2:38

Prem Kumar

15-Mar-02 2:38

HI,
It works for a generic window also

if( CWnd::OnNcHitTest(point) == HTCAPTION)
return HTNOWHERE ;

Tomasz Sowinski15-Mar-02 2:43

15-Mar-02 2:43

Yes, it should work for all types of windows. The sample was just taken from main frame window in small SDI app.

Tomasz Sowinski -- http://www.shooltz.com

Drag and Resize ActiveX control in CView

Prem Kumar15-Mar-02 2:33

Prem Kumar

15-Mar-02 2:33

Hi,
I guest windows provides the default action for moving
u cannot stop the moving, but u can get back to the same position
by using some thing ilke that foll code.

In WM_INITDIALOG, take the window rect and on OnMove
code it like the foll.

void CTstNoMoveDlg::OnMove(int x, int y)
{
CDialog::OnMove(m_Rect.left, m_Rect.top);
if( m_Rect.Width() > 100 )
::SetWindowPos(m_hWnd,HWND_NOTOPMOST,m_Rect.left,m_Rect.top,m_Rect.Width(),m_Rect.Height(),/*SWP_NOSENDCHANGING*/SWP_SHOWWINDOW);
}
The reason for the If condition is a WM_MOVE is sent before the dialog is
even properly instantiated at this pt the size might be rather less.

sanskypotov15-Mar-02 1:58

sanskypotov

15-Mar-02 1:58

Hi,
Can someone tell me is there any way to use an ActiveX
control in CView. The intention is to use the ActiveX
with additional facility like drag and resize the ActiveX
control.
Regards,
Sansky Big Grin | :-D

God is Good, all the Time.
All the Time, God is Good.

please help me

15-Mar-02 1:55

i am not understanding how to get the ' key .
for f1 key i have used vk_f1 virtual code .is there any such code for ' key. please do reply Confused | :confused:

Tomasz Sowinski15-Mar-02 2:08

15-Mar-02 2:08

What are you trying to do? Process WM_KEYDOWN message? Creating global keyboard hook for password sniffer? Something else?

Tomasz Sowinski -- http://www.shooltz.com

Tim Smith15-Mar-02 2:10

Tim Smith

15-Mar-02 2:10

VK_OEM_3 on US keyboards.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Tomasz Sowinski15-Mar-02 2:14

15-Mar-02 2:14

Isn't it VK_OEM_7?

Tomasz Sowinski -- http://www.shooltz.com

Tim Smith15-Mar-02 3:14

Tim Smith

15-Mar-02 3:14

You are right, VK_OEM_3 is `~ where VK_OEM_7 is '".

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Christian Graus15-Mar-02 10:30

Christian Graus

15-Mar-02 10:30

You can check the char value with "'".

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm thinking of getting married for companionship and so I have someone to cook and clean." - Martin Marvinski, 6/3/2002

RGB to HSB Conversion..

Neha15-Mar-02 1:12

Neha

15-Mar-02 1:12

Hi,
Does anyone knows how to convert RGB to HSB Value?
Thanks
Neha

Tomasz Sowinski15-Mar-02 1:19

15-Mar-02 1:19

If you want RGB to HSV conversion, check this link:
http://www.cs.rit.edu/~ncs/color/t_convert.html

Tomasz Sowinski -- http://www.shooltz.com

Neha15-Mar-02 1:43

Neha

15-Mar-02 1:43

Thanks for the reply.
But the HSL Value i will get through that function won't match with the value displayed in the window standard color dialog box.

Tomasz Sowinski15-Mar-02 2:06

15-Mar-02 2:06

HSL is slightly different than HSV. Check this for algorithm:

http://www.mpa-garching.mpg.de/MPA-GRAPHICS/hsl-rgb.html

Tomasz Sowinski -- http://www.shooltz.com

Tomasz Sowinski15-Mar-02 2:12