Re: Why do I get warning C4748? [modified] - C / C++ / MFC Discussion Boards

Re: Why do I get warning C4748?

Maximilien23-Sep-10 3:34

Maximilien

23-Sep-10 3:34

I copy/pasted this code and I don get a warning (Level 4).

Even if there's a missing ; at the end of

MyBase (){}

Watched code never compiles.

Re: Why do I get warning C4748?

David Crow23-Sep-10 4:21

David Crow

23-Sep-10 4:21

What compiler did you use?

"One man's wage rise is another man's price increase." - Harold Wilson

"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

"Man who follows car will be exhausted." - Confucius

Re: Why do I get warning C4748?

Maximilien23-Sep-10 4:43

Maximilien

23-Sep-10 4:43

oops forget to say...

VS2010.

Watched code never compiles.

Re: Why do I get warning C4748?

Stefan_Lang23-Sep-10 4:34

Stefan_Lang

23-Sep-10 4:34

Hm, just pasted the code to another location and there it compiles fine.

I originally had it at the location where the original definitions are, that produced the error. This leads me to believe that it's not this code, it is something in the headers or code that comes before.

Thanks for giving me the idea to test this, hadn't thought of checking headers.

P.S.:
The line you quoted is a definition, not just a declaration. I am not aware there is any need for a ';'?

Re: Why do I get warning C4748?

Luc Pattyn23-Sep-10 4:48

Luc Pattyn

23-Sep-10 4:48

in general, compiler messages and run-time exceptions provide filename, classname, linenumber information to avoid any confusion. use them to your advantage.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

Re: Why do I get warning C4748?

Stefan_Lang23-Sep-10 6:55

Stefan_Lang

23-Sep-10 6:55

I am assuming this is meant to be helpful, but it is not. The compiler did not give me any more information than what I offered in the OP, and it did point to what in my obfuscated example is represented by the function sum().

There's nothing wrong I see whith that function, nor with the object that is being instantiated there, and still, the fact that this object is there and the class is being defined as it is somehow contributes to the compiler generating a warning.

I wouldn't be surprised if I eventually find the MS libraries to responsible - I just worked on another problem and after about a half hour of searching I eventually realized it was due to a global #define in winsock.h. Thank you MS! Mad | :mad:

Re: Why do I get warning C4748?

Luc Pattyn23-Sep-10 7:16

Luc Pattyn

23-Sep-10 7:16

When I use VS2010 for native C, I get messages such as
...nativecode.c(13) : warning C4700: uninitialized local variable 'k' used
which clearly points to line 13.

What compiler are you using that doesn't do so?

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

Re: Why do I get warning C4748? [modified]

Stefan_Lang23-Sep-10 23:03

Stefan_Lang

23-Sep-10 23:03

I've found the culprit. It's the external library declarations. Apparently all or most of them contain lines like this:

# ifdef NT
#  ifdef _DEBUG
#   pragma comment( lib, "geomkern70d.lib") /* force link in VC++ */
#  else
#   pragma comment( lib, "geomkern70.lib") /* force link in VC++ */
#  endif
#  pragma optimize("", off)
# endif

Note the #pragma optimize line, that is executed independent of whether or not this is debug code (i. e. it's outside the #ifdef _DEBUG block)! OMG | :OMG:

This will affect every file that directly or indirectly references this external library! (or any other external library with similar DECL headers)

Obviously, this line overrides the project settings, and thus code does not get optimized, no matter what I say Thumbs Down | :thumbsdown:

I will now go and investigate why this line is in there, and whether or not it's safe to remove it. Provided I can still find anyone who was around at the time this code was written...

P.S.: the reason I posted the whole context was that I found a whole bunch of *decl* header files looked exactly like that, so I at first assumed it was generated, either by VS 2003, or whatever IDE was being used at the time these were created. I am still not sure about that...

modified on Friday, September 24, 2010 7:02 AM

Array traversal

T.RATHA KRISHNAN23-Sep-10 1:31

T.RATHA KRISHNAN

23-Sep-10 1:31

Hi!
I've two arrays. One array of strings. Another one of StaticText boxes. I've to read the array from the end and set each string to the StaticText element starting from the beginning(i.e I've to set the last text to the first static text element). Can anyone help me how to traverse these two arrays?

Re: Array traversal

_AnsHUMAN_ 23-Sep-10 2:02

_AnsHUMAN_

23-Sep-10 2:02

Traverse array with static boxes from top to bottom and use another variable to get the values from the second array.
Ex: NO_OF_ELEMENTS is the number of elements you have in the arrays and number should be the same for both the arrays

<br />
for (i=0;i < NO_OF_ELEMENTS;i++)<br />
{<br />
     // And do something like<br />
     //m_stArray[NO_OF_ELEMENTS-i].SetWindowText (m_strArray[i]);<br />
}<br />

I am a HUMAN. I have that keyword (??? too much) in my name........
Wink | ;-)

_AnsHUMAN_b>

Re: Array traversal

Emilio Garavaglia23-Sep-10 4:11

Emilio Garavaglia

23-Sep-10 4:11

In different format, but sometimes preferable (although it is a matter of taste)

for(int i=0, j=N-1; i<N; ++i,--j)
   a[i].operation_on(b[j]);

use two indexes, but does not recalculate the offsets.

2 bugs found.
> recompile ...
65534 bugs found.
D'Oh! | :doh:

Re: Array traversal

Niklas L23-Sep-10 21:04

Niklas L

23-Sep-10 21:04

for (i=0;i < NO_OF_ELEMENTS;i++)
{
    // And do something like
    m_stArray[NO_OF_ELEMENTS-i -1  ].SetWindowText (m_strArray[i]);
}

home

Re: Array traversal

KarstenK23-Sep-10 3:11

KarstenK

23-Sep-10 3:11

make the IDs of the boxes in order or fetch their handles in an array...

it works fine

Press F1 for help or google it.
Greetings from Germany

Remove Features/components from Windows 7 [modified]

Aabid22-Sep-10 23:13

Aabid

22-Sep-10 23:13

Hello All,

I want to delete "Games" from windows 7. i.e. delete all the installation files from the system, so that if in case user turns the Game feature ON, OS should ask for some media like DVD to copy those installation files.

Turn the Feature OFF & ON does not achieve my target. i have to remove files to make more space available.

NOTE: By default windows 7 contains all the files within its local storage ie HDD

Any suggestion how to approach the problem.

Thanks!

modified on Thursday, September 23, 2010 5:26 AM

Re: Remove Features/components from Windows 7

Maximilien23-Sep-10 0:51

Maximilien

23-Sep-10 0:51

With C/C++ ? or is this a general question ?

Watched code never compiles.

Re: Remove Features/components from Windows 7

Aabid23-Sep-10 1:04

Aabid

23-Sep-10 1:04

it is general discussion. or if there is any API or any way in C, i can go for that too.

View

john563222-Sep-10 21:52

john5632

22-Sep-10 21:52

I have create a SDI application with Doc/View architecture. I have attached a view while creating mainframe (code below).

pDocTemplate = new CSingleDocTemplate(
		IDR_MAINFRAME,
		RUNTIME_CLASS(COptiumDoc),
		RUNTIME_CLASS(CMainFrame),       // main SDI frame window
		RUNTIME_CLASS(CMyView));

I want to access function created in CMyView from the Mainframe.
How can I do that?

Re: View [modified]

mesajflaviu22-Sep-10 22:15

mesajflaviu

22-Sep-10 22:15

CMyView* pView = (CMyView*)GetActiveView()

for further problem to have pointer access look here ^

modified on Friday, September 24, 2010 1:14 AM

Drawing

Benjamin Bruno22-Sep-10 7:29

Benjamin Bruno

22-Sep-10 7:29

hi
I want to draw a perpendicular line from another line.How can it be implemented in VC++(GDI).

thanks Sniff | :^)

Re: Drawing

David Crow22-Sep-10 8:06

David Crow

22-Sep-10 8:06

Have you looked at MoveTo(), LineTo(), et al?

Re: Drawing

sharp prospector23-Sep-10 4:14

sharp prospector

23-Sep-10 4:14

Use analytic geometry this is easy to solve. A line can be defined by two points. You want another line that passes through a point and form a right angle with the first line.

After you find the second line use GDI functions MoveTo() and LineTo() to draw the second line.

CListCtrl Border

john563222-Sep-10 6:50

john5632

22-Sep-10 6:50

Hi,

I have created a CListControl, I want to draw grey border color around it so I write the below code to draw border but all string are not visible.
How to do that?

void CListCtrl::OnPaint()
{
	
	CPaintDC dc(this); // device context for painting
	//CListCtrl::OnPaint();
	// TODO: Add your message handler code here
	// Do not call CListCtrl::OnPaint() for painting messages
	CRect rect;
	GetClientRect(rect);
	CPen pen(PS_SOLID,1,RGB(211,211,211));
	CBrush* pOldBrush = (CBrush*)dc.SelectStockObject( NULL_BRUSH );
	dc.SelectObject(&pen);
	//dc.SetROP2(R2_NOT   );

		dc.Rectangle(&rect);
	pOldBrush->DeleteObject();
	pen.DeleteObject();

	}

Re: CListCtrl Border

Maximilien22-Sep-10 8:46

Maximilien

22-Sep-10 8:46

You need to override the OnNcPaint, not the OnPaint.

And don't forget to call "Default();" to draw the interior
for example (done for a listbox derived class, but you should be able to see how it workd...
void MyListBox::OnNcPaint()
{
// draw the inside.
Default();

// draw over the border.
CRect rc;
GetWindowRect(rc);

CDC *pDC = GetParent()->GetDC();
GetParent()->ScreenToClient( rc );
// do the drawing ...
pDC->FrameRect( rc , brush );
rc.DeflateRect( 1, 1, 1, 1 );
pDC->FrameRect( rc,brush );

}

Watched code never compiles.

Re: CListCtrl Border

john563222-Sep-10 22:42

john5632

22-Sep-10 22:42

Thanks for you reply.

I replied (code below) but getting any border around the window

void CTxListCtrl::OnNcPaint()
{
	// TODO: Add your message handler code here
	// Do not call CListCtrl::OnNcPaint() for painting messages
	// draw the inside.
	Default();

	// draw over the border.
	CRect rc;
	GetWindowRect(rc);

	CDC *pDC = GetParent()->GetDC();
	GetParent()->ScreenToClient( rc );
	CBrush  brush(RGB(255,0,0)); 

	CPen pen(PS_SOLID,1,RGB(211,211,211));
	pDC->SelectObject(&pen);
	pDC->Rectangle(&rc);

	pDC->FrameRect( rc , &brush );
	rc.DeflateRect( 1, 1, 1, 1 );
	pDC->FrameRect( rc,&brush );
}

Re: CListCtrl Border

Rolf Kristensen23-Sep-10 0:49

Rolf Kristensen

23-Sep-10 0:49

Why not set a style that creates a client edge around your CListCtrl:

BEGIN_MESSAGE_MAP(CMyListCtrl, CListCtrl)
	//{{AFX_MSG_MAP(CMyListCtrl)
	ON_WM_CREATE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

void CMyListCtrl::OnCreateStyles()
{
	// Will be called twice when placed inside a CView / CFormView

	// Set slim border
	ModifyStyle(WS_BORDER, 0);
	ModifyStyleEx(WS_EX_STATICEDGE, WS_EX_CLIENTEDGE);
}

void CMyListCtrl::PreSubclassWindow()
{
	CListCtrl::PreSubclassWindow();

	OnCreateStyles();
}

int CMyListCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CListCtrl::OnCreate(lpCreateStruct) == -1)
		return -1;

	OnCreateStyles();
	return 0;
}

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