C / C++ / MFC Discussion Boards

Re: program cannot execute..

Hamid_RT18-Dec-06 18:13

Hamid_RT

18-Dec-06 18:13

Can you show your code that you writted for triangle and it doesnt work?

WhiteSky

Re: program cannot execute..

cyn818-Dec-06 18:36

cyn8

18-Dec-06 18:36

Here is the code..but this is oni will draw lines.
////////this is testctrl.cpp//////////////////
void testctrl::OnPaint()
{

CPaintDC dc(this); // device context for painting

}

//////////////////////////////////
// Do not call CPropertyPage::OnPaint() for painting messages

void testctrl::Draw(CDC *pDC)
{
CRect rect;
CPen penBlack;
penBlack.CreatePen(PS_SOLID, 0, RGB(0,255,0));
CPen* pOldPen=pDC->SelectObject(&penBlack);
GetClientRect(rect);
int vectorValues[] = {1,1,0,0,1,1}; // for testing
int m_currentXCoord=0;

int width=10;
for(int i = 0; i < 19; i++)
{
if(vectorValues[i] == 1)
{
pDC->MoveTo(m_currentXCoord,10);
pDC->LineTo(m_currentXCoord+width,10);
m_currentXCoord = m_currentXCoord + width;
}

else

{
pDC->MoveTo(m_currentXCoord,20);
pDC->LineTo(m_currentXCoord+width,20);
m_currentXCoord = m_currentXCoord + width;

} // a 0 so only update X coordinate
}

pDC->SelectObject(pOldPen);
}

BOOL testctrl::OnEraseBkgnd(CDC* pDC)
{
// To avoid flickering
return CWnd::OnEraseBkgnd(pDC);
// return TRUE;
}
/////////////////////////////////////////////////

/////////////this is testdlg.cpp/////////////////////
void CTestDlg::OnButton1()
{
// TODO: Add your control notification handler code here
CDC dc;
m_custom.Draw(&dc);
UpdateData(FALSE);
UpdateDialogControls(this,FALSE);
}

void CTestDlg::OnUpdateStart(CCmdUI* pCmdUI)
{
pCmdUI->Enable(TRUE);
}
/////////////////////////////////////////////////
thanks for ur help

Re: program cannot execute..

Hamid_RT18-Dec-06 18:44

Hamid_RT

18-Dec-06 18:44

CDC dc;
m_custom.Draw(&dc);
what happens if you use of this code instead above code

<br />
CDC *dc;<br />
dc=GetDC();<br />
m_custom.Draw(dc);<br />

WhiteSky

Re: program cannot execute.. [modified]

prasad_som18-Dec-06 20:08

prasad_som

18-Dec-06 20:08

cyn8 wrote:
/////////////this is testdlg.cpp/////////////////////
void CTestDlg::OnButton1()
{
// TODO: Add your control notification handler code here
CDC dc;
m_custom.Draw(&dc);
UpdateData(FALSE);
UpdateDialogControls(this,FALSE);
}

You are passing uninitialized CDC object to Draw. What you are doing ? It should call this way in first place. You need to use UpdateWindow like function in combination with Invalidate.

-- modified at 2:21 Tuesday 19th December, 2006

-- modified at 5:04 Tuesday 19th December, 2006

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: program cannot execute..

Hamid_RT18-Dec-06 20:31

Hamid_RT

18-Dec-06 20:31

I think he forgots to set dc Smile | :)

WhiteSky

Re: program cannot execute..

Hamid_RT19-Dec-06 7:25

Hamid_RT

19-Dec-06 7:25

Does your problem solve?

WhiteSky

to reduce footprint

George_George18-Dec-06 15:51

George_George

18-Dec-06 15:51

Hello everyone,

I am wondering how to reduce the footprint of a binary build (C/C++) program generated by gcc.

1. Any ideas of reduce the footprint of a debug version build?
2. Any ideas of reduce the footprint of a release version build?

I think some linker or compiler options may help, what are they? Any other ideas to reduce footprint?

thanks in advance,
George

Re: to reduce footprint

Paul Conrad25-Dec-06 19:01

Paul Conrad

25-Dec-06 19:01

George_George wrote:
I am wondering how to reduce the footprint of a binary build (C/C++) program generated by gcc

Don't use gcc. Even if you optimize for size, it will still be pretty bloated compared to other C++ compilers...

If you try to write that in English, I might be able to understand more than a fraction of it. - Guffa

Re: to reduce footprint

George_George27-Dec-06 6:09

George_George

27-Dec-06 6:09

Thanks PaulC1972!

Do you have more detailed comments or advices (for example, why gcc will generate larger code)? Or some reference documents to read?

regards,
George

Re: to reduce footprint [modified]

Paul Conrad27-Dec-06 6:18

Paul Conrad

27-Dec-06 6:18

George_George wrote:
why gcc will generate larger code?

Not 100% sure. Look at Comparing C++ Compilers, October 2003 Dr. Dobb's Journal[^], and at C/C++ Compiler Optimization, May 2004 Dr. Dobb's Journal[^]. The May issue was a good one about optimization and tuning performance. Both issues are worth looking at.

Last modified: 1hr 48mins after originally posted -- Clickities added to referenced articles...

Some people have a memory and an attention span, you should try them out one day. - Jeremy Falcon

Re: to reduce footprint

George_George30-Dec-06 7:18

George_George

30-Dec-06 7:18

Very good reference, thanks PaulC1972!

regards,
George

Re: to reduce footprint

Paul Conrad30-Dec-06 7:27

Paul Conrad

30-Dec-06 7:27

No problem, George. After this thread started, I ended up rereading those articles I referred you to Big Grin | :-D

Re: to reduce footprint

George_George4-Jan-07 18:42

George_George

4-Jan-07 18:42

Wow... Could you briefly describe the main idea of the articles in your words? Articles are long...

regards,
George

Validate and Invalidate in RedrawWindow() [modified]

rp_suman18-Dec-06 15:22

rp_suman

18-Dec-06 15:22

For what purpose do we need VALIDATE and INVALIDATE flags in RedrawWindow()?
What is the difference between them?
Thanks & Regards,
Suman

-- modified at 23:02 Monday 18th December, 2006

Re: Validate and Invalidate in RedrawWindow()

Stephen Hewitt18-Dec-06 15:41

Stephen Hewitt

18-Dec-06 15:41

InvalidateRect and friends just marks a region of a window as "dirty" and it will be repainted at some time in the future. RedrawWindow causes a redraw to happen on the spot; even so, depending on the flags passed, only the "dirty" regions may be redrawn.

Steve

Re: Validate and Invalidate in RedrawWindow() [modified]

prasad_som18-Dec-06 17:59

prasad_som

18-Dec-06 17:59

rp_suman wrote:
For what purpose do we need VALIDATE and INVALIDATE

Invalidate flags adds specified windows rect , regn to window to be repainted.
Validate flags removes specified windows rect , regn from window to be repainted.(In short it removes dirty flag).

-- modified at 0:06 Tuesday 19th December, 2006

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: Validate and Invalidate in RedrawWindow()

rp_suman18-Dec-06 19:21

rp_suman

18-Dec-06 19:21

Thanks for great help from you both!!
Thanks & Regards,
Suman

Re: Validate and Invalidate in RedrawWindow()

rp_suman19-Dec-06 21:31

rp_suman

19-Dec-06 21:31

RDW_NOCHILDREN flag should be used with which one, RDW_INVALIDATE or RDW_VALIDATE.
Is it meaningful to use with RDW_INVALIDATE.
Thanks & Regards,
Suman

Re: Validate and Invalidate in RedrawWindow()

prasad_som27-Dec-06 18:08

prasad_som

27-Dec-06 18:08

rp_suman wrote:
Is it meaningful to use with RDW_INVALIDATE

Yes, ofcourse.

If you have new question, start new thread, users here usually doesn't turn back to to old posts( but I do in this case Smile | :)

) , unless got any email notification.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: Validate and Invalidate in RedrawWindow()

rp_suman2-Jan-07 5:19

rp_suman

2-Jan-07 5:19

Thanks for help!
Wishing you a Happy New Year!!
Thanks & Regards,
Suman

Tab Control in existing dialog box

acerunner31618-Dec-06 14:07

acerunner316

18-Dec-06 14:07

I am using MFC. I want to add a tab control in an existing dialog box. I found this example:
http://www.codeproject.com/useritems/Simple_Tab_Control.asp
but it seems that you have to create a window for each tab, with the main Window having just the tab control. How can I add a tab control without having to redo what I already have?

Re: Tab Control in existing dialog box

Mark Salsbery18-Dec-06 15:01

Mark Salsbery

18-Dec-06 15:01

The Windows tab common control provides the tabs but you still need to provide a window for each
tab.

What is it you are trying to do by adding a tab control without additional windows?

Re: Tab Control in existing dialog box

acerunner31618-Dec-06 15:11

acerunner316

18-Dec-06 15:11

Well, not necessary WITHOUT additional windows, but place my existing dialog window inside a tab.

The reason I want to do that is because my app really will be performing the task of two related apps. So instead of having two seperate executables, I was thinking use two tabs, one for each "app".

Re: Tab Control in existing dialog box

Mark Salsbery18-Dec-06 15:30

Mark Salsbery

18-Dec-06 15:30

Cool. You could make the dialogs modeless child dialogs if they aren't already (they could
even be the same class).
Instead of making the tab control a child of the dialog, make it a child of a simple frame
window. The frame window can hold the tab control and the dialogs and handle all the
associated resizing/repositioning. That gives you the option of a common toolbar and status
bar as well.

Just a thought.

Re: Tab Control in existing dialog box [modified]

acerunner31618-Dec-06 15:35

acerunner316

18-Dec-06 15:35

how do I change my existing dialog (which is the main dialog window for the project) to a child? And how to I set another window (frame window) to be the new parent of the project?
Thanks

Also, would it be necessary for the main window to have OnInitDialog, OnSysCommand, OnPaint, and OnQueryDragIcon. In which case, I would have to add those functions in the new main window, and remove them from what is now the child window? And also transfering the system menu (including the about...)?

-- modified at 22:10 Monday 18th December, 2006

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