C / C++ / MFC

13-Mar-06 2:28

Hi,
I m facing a strange problem.
I have the following code

myclass
{
set<unsigned> m_uniqueCalUIDs;
public:
int AddPoint(unsigned);
...
};
int AddPoint(unsigned uid)
{
try
{
if (m_uniqueCalUIDs.size() &&
m_uniqueCalUIDs.find(pCal->GetUID()) == m_uniqueCalUIDs.end() &&
m_nMode != MM_LINE)
return -1;
m_uniqueCalUIDs.insert(uid);
...
return 0;
}
catch(...)
{
AfxMessageBox("Unknown Exception");
return -1;
}
}

This class is defined in a DLL (and exported ofcourse) and I am instantiating it in my exe. I call this function from exe too. This code is working fine in the debug mode but it is throwing exception in release mode.
I tried to figure out why is it doing that
I have another class too in the dll that is using set and that is working fine
so can anybody help

Monty²13-Mar-06 2:33

Monty²

13-Mar-06 2:33

Farhat Aisha wrote:
_uniqueCalUIDs.find(pCal->GetUID())

what is pCal?

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

Farhat Aisha13-Mar-06 2:37

13-Mar-06 2:37

This is another class pointer and i have already check it before entering the function. It is not null. And i have also replaced with with a constant too like
uniqueCalUIDs.insert((unsigned)11);
but it is still throwing the exception

toxcct13-Mar-06 2:38

toxcct

13-Mar-06 2:38

and the exception is... ?
where does it happen also ?

Farhat Aisha13-Mar-06 3:00

13-Mar-06 3:00

Actually it is throwing the exception on that line. I ccouldn;t get the exception type
I caught it with catch(...)

But i have finally get around with this problem when i changed my variable
from set <unsigned> to set<int>

and type-cast the argument i am passing to it

if (m_uniqueCalUIDs.size() &&
m_uniqueCalUIDs.find((int)pCal->GetUID()) == m_uniqueCalUIDs.end() &&
m_nMode != MM_LINE)
return -1;

m_uniqueCalUIDs.insert((int)pCal->GetUID());

But this is really wierd to me. Any idea why is it behaving like that?

-- modified at 9:01 Monday 13th March, 2006

James R. Twine13-Mar-06 2:59

James R. Twine

13-Mar-06 2:59

Farhat Aisha wrote:
This is another class pointer and i have already check it before entering the function. It is not null.

Not NULL does not necessarily mean valid. You might want to see if the exception is being raised before you call into the STL class, when you dereference the pointer (by accessing a member off of it).

Peace!

-=- James

If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
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Farhat Aisha13-Mar-06 3:01

how to paint a bitmap on client?

13-Mar-06 3:01

I replaced it with a constant value like insert((unsigned) 11) and it still crashed

derek713-Mar-06 2:00

derek7

13-Mar-06 2:00

case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;

hdcMem = CreateCompatibleDC (hdc) ;
SelectObject (hdcMem, hBitmap) ;

BitBlt (hdc, 0, 0, cx , cy, hdcMem, 0, 0, SRCCOPY) ;

DeleteDC (hdcMem) ;
EndPaint (hwnd, &ps) ;
return 0 ;
it is a way,but how to paint without memory device context?
but SelectObject (hdc, hBitmap) does not put bitmap on screen.

C^hris L^osinger13-Mar-06 2:09

C^hris L^osinger

13-Mar-06 2:09

derek7 wrote:
but how to paint without memory device context?

if you can get your image as a DIB, you can use StretchDIBits (and related functions). but if you have an HBITMAP/CBitmap, you'll need to use a memory DC.

Cleek | Image Toolkits | Thumbnail maker

Hamid_RT13-Mar-06 2:16

Hamid_RT

13-Mar-06 2:16

Hi derek7,

CImage m_Image;
m_Image.Load("c:\\picture.bmp");

void CAnswerView::OnPaint()
{
CPaintDC dc(this); // device context for painting
m_Image.BitBlt(dc.m_hDC,CRect(0,0,800,600),CPoint(0,0));
}

-- modified at 9:04 Monday 13th March, 2006

James R. Twine13-Mar-06 3:01

James R. Twine

13-Mar-06 3:01

-Although you do NOT want to keep on loading the image file each time you get a paint message...

Peace!

-=- James