Re: background bitmaps disappearing - C / C++ / MFC Discussion Boards

Re: how to keep on this program executing when I put it at the backgound?

InOut.NET10-Jul-07 3:14

10-Jul-07 3:14

Sorry - Im was wrong - the fact that it works in foreground i missed. Ignore my posting. I thought you had a code design issue.

Well, other guy suggested the os. I would say the same. And i think it is something you'll find in Linux articles. I don't know C threads and linux in the detail you might need.

Adding Controls in Runtime

InOut.NET10-Jul-07 1:23

InOut.NET

10-Jul-07 1:23

I'm Frustrated. in .NET a easy Control.Add(new TextBox()) will create a textbox during runtime.
Do anyone know of a way to add controls to a panel during runtime? (or form)

And also may someone point me to some litrature that *explains* the advanced methods with respect to controls and control containers in C++ VCL?

Appreciate it

Re: Adding Controls in Runtime

Hamid_RT10-Jul-07 1:36

Hamid_RT

10-Jul-07 1:36

You can use of Create or CreateWindow or you can declare a variable for example CButton m_button; m_Button.Create(...); and after create it declare events for it.

WhiteSky

Re: Adding Controls in Runtime

Mark Salsbery10-Jul-07 6:24

Mark Salsbery

10-Jul-07 6:24

In addition to WhiteSky's reply...

Everything you ever wanted to know (and more) about Windows controls can be found here:

Individual Control Information[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++

This episode brought to you by the letter Z

Re: Adding Controls in Runtime

InOut.NET10-Jul-07 7:01

InOut.NET

10-Jul-07 7:01

Thanks for Info,
I got it.
The Create and CreateWindows seemed to be a bit low level programming.

I found a InsertControl(TWinControl*) on the panel that i missed. It works perfect.

I program in Borland using VCL - so the Create does not exist.

Thanks anyhow.

Re: Adding Controls in Runtime

Mark Salsbery10-Jul-07 7:03

Mark Salsbery

10-Jul-07 7:03

InOut.NET wrote:
I program in Borland using VCL

I missed that Smile | :)

We were referring to Windows APIs, so yes, low level.

Cheers!
Mark

Mark Salsbery
Microsoft MVP - Visual C++

This episode brought to you by the letter Z

background bitmaps disappearing

chaitu_41210-Jul-07 1:09

chaitu_412

10-Jul-07 1:09

Hi,

i have done an mdi application in which all views will have bitmaps as background. I am attaching bitmaps in Onpaint() function of all views.In some view classes i am creating font every time i am calling onpaint function.

this is the code
void CMyView::OnPaint()
{
CPaintDC dc(this); // device context for painting
AttachBitmap(IDB_USERNAME, &dc, CRect(631,23,766,58));
CFont fFont;
CFont *fOldFont;

if(fFont.CreateFont(11,0,0,0, FW_BLACK ,false, false, false, DEFAULT_CHARSET, OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, ANTIALIASED_QUALITY, DEFAULT_PITCH | FF_DONTCARE, "Tahoma")!=NULL)
{
fOldFont = dc.SelectObject(&fFont);
}
}

this is attachbmp function

BOOL AttachBitmap(UINT sBMPFile, CDC *pDC, CRect rect)
{
CDC memDC;
CBitmap cBitmap;
CBitmap* pOldMemBmp = NULL;
if(!cBitmap.LoadBitmap(sBMPFile))
AfxMessageBox("ting");
memDC.CreateCompatibleDC(pDC);
pOldMemBmp = memDC.SelectObject(&cBitmap);
BITMAP bmpInfo;
cBitmap.GetBitmap(&bmpInfo);

TransparentBlt(pDC->GetSafeHdc(), rect.left, rect.top, rect.Width(), rect.Height(),
memDC.GetSafeHdc(), 0, 0, bmpInfo.bmWidth, bmpInfo.bmHeight,COLORREF(RGB(0,255,0)));

if (pOldMemBmp) pDC->SelectObject(pOldMemBmp);

return TRUE;
}

these functions are used in almost all views of my mdi application.

Problem is that after running application for more than oneday.. bitmaps are getting disappeared and system is showing virtual memory of your system is low. and a warning appears as font cannot be created .. what could be the reason? any help is appreciated.

thank you

chaitu

Re: background bitmaps disappearing

Christian Graus10-Jul-07 1:16

Christian Graus

10-Jul-07 1:16

This means you're leaking memory. The GDI memory you're leaking is the bitmap itself, I believe. Why do you load it every time ? Make it a member variable, so you load it only once, that just makes sense.

Either way, I'm not sure if that solves the core issue, but it might, it will sure simplify the code. But, somewhere in your app, you are leaking GDI resources, and you're running out.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: background bitmaps disappearing

chaitu_41210-Jul-07 1:22

chaitu_412

10-Jul-07 1:22

hi graus ,

thanks for your reply, i will try that..

pass values in dsn at runtime

meenakhisjoshi10-Jul-07 0:59

meenakhisjoshi

10-Jul-07 0:59

I have created dsn at runtime but i have to enter the values like- user name, password also at runtime.
So how can i do this in vc++?
plzz help me..

thanks in advance

Re: pass values in dsn at runtime

David Crow10-Jul-07 3:15

David Crow

10-Jul-07 3:15

In the fourth argument to SQLConfigDataSource(), you could try the UID and PWD keywords. Those may be driver specific, however.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

about "round" function in visual C++

mt_samiei10-Jul-07 0:34

mt_samiei

10-Jul-07 0:34

Dear all
I have one double number which i want to round to nearest decimal number in Visual C++.
What is the function to do this
REgards
Monhi

Re: about "round" function in visual C++ [modified]

CPallini10-Jul-07 0:53

CPallini

10-Jul-07 0:53

double d =whatever;
int i = (int)(d + .5);

Please note that, as pointed out by Rage it doesn't work properly with negative numbers See the fix here [^].

-- modified at 8:10 Tuesday 10th July, 2007

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: about "round" function in visual C++

Rage10-Jul-07 1:59

Rage

10-Jul-07 1:59

d=-5.6 => i=-5, not -6. Is this ok ?

http://www.readytogiveup.com/[^] - Do something special today.

Re: about "round" function in visual C++

toxcct10-Jul-07 2:05

toxcct

10-Jul-07 2:05

he probably should take the absolute value, and then apply it the original sign...

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: about "round" function in visual C++

CPallini10-Jul-07 2:09

CPallini

10-Jul-07 2:09

Rage wrote:
d=-5.6 => i=-5, not -6. Is this ok ?

No, of course. I (naively) assumed d > 0.
But there is an easy fix to account for negative numbers:

i = (int) ( d < .0 ? d -.5 : d + .5 );

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.

LVN_BEGINDRAG

baerten9-Jul-07 21:51

baerten

9-Jul-07 21:51

Hi everybody,

i put a ListControl on a dialog and want to catch the LVN_BEGINDRAG Handler.
I know that LVN_BEGINDRAG is a notify message.

I tried already :

ON_NOTIFY_REFLECT(LVN_BEGINDRAG,OnBeginDrag)

and via :

OnNotify(WPARAM w,LPARAM l, ...
{
if(((LPNMHDR)l)->code == LVN_BEGINDRAG)
int ok = 1; --> breakpoint

but i can't catch it Unsure | :~

I tried also directly to add a handler via the ressource editor by adding a new handler,
but there i can't find the LVN_BEGINDRAG handler, only DoubleClick, Set & KillFocus ...

How should i catch it?

Big thanks Smile | :)

Re: LVN_BEGINDRAG

Aamir Butt9-Jul-07 23:35

Aamir Butt

9-Jul-07 23:35

Try this:

ON_NOTIFY(LVN_BEGINDRAG, IDC_LISTVIEW1, OnLvnBeginDrag)

This should work.

"Some people believe football is a matter of life and death.
I'm very disappointed with that attitude.
I can assure you it is much, much more important than that. -- Bill Shankly"

Re: LVN_BEGINDRAG

baerten10-Jul-07 0:02

baerten

10-Jul-07 0:02

Thanks for your answer Smile | :)

Is it necessairy to create a class from this Listbox from which i want to catch the Drag?

Because it won't work Frown | :(

Re: LVN_BEGINDRAG

Hamid_RT10-Jul-07 1:22

Hamid_RT

10-Jul-07 1:22

Dont need to it.Maybe you want to see Drag and Drop between and within a CListCtrl[^].(if you want to listctrl on your previous message)

WhiteSky

Re: LVN_BEGINDRAG

baerten10-Jul-07 3:38

baerten

10-Jul-07 3:38

Thanks for the tutorial,

but i really don't find where i can add the LVN_BEGINDRAG-handler via the classwizard.
I tried a lot of things, but no way to find a LVN_BEGINDRAG.

Unsure | :~

Re: LVN_BEGINDRAG

Mark Salsbery10-Jul-07 6:28

Mark Salsbery

10-Jul-07 6:28

You may actually have to type it in by hand Smile | :)

For the handler prototype(s), see ON_NOTIFY and WM_NOTIFY Messages[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++

This episode brought to you by the letter Z

Re: LVN_BEGINDRAG

Hamid_RT10-Jul-07 8:34

Hamid_RT

10-Jul-07 8:34

Insert this code to your program

///On the cpp file insert these codes
BEGIN_MESSAGE_MAP(CDialogDlg, CDialog)
	ON_NOTIFY(LVN_BEGINRDRAG, IDC_LIST2, OnLvnBeginrdragList2)
END_MESSAGE_MAP()


void CDialogDlg::OnLvnBeginrdragList2(NMHDR *pNMHDR, LRESULT *pResult)
{
	LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
	// TODO: Add your control notification handler code here
	*pResult = 0;
}

///And on the header file insert this code
	afx_msg void OnLvnBeginrdragList2(NMHDR *pNMHDR, LRESULT *pResult);

WhiteSky

Re: LVN_BEGINDRAG

baerten10-Jul-07 21:11

baerten

10-Jul-07 21:11

Big thanks Smile | :)

,

my code was completely correct, but probably the CListbox don't support drag&drop,
with CListCtrl it works fine

Re: LVN_BEGINDRAG

Hamid_RT10-Jul-07 21:28

Hamid_RT

10-Jul-07 21:28

I suggest use of CListCtrl on your program its better and very flexible than CListBox.;)

WhiteSky

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