C / C++ / MFC

27-Jan-03 19:21

a very high-level try{ } catch(...) block will catch many of these things. but, it's still better to prevent them from happening in the first place.

-c

ILockBytes

Re: Inverse Hyperbolic Sine?

Re: Program crash

Mike Nordell27-Jan-03 21:17

Mike Nordell

27-Jan-03 21:17

Chris Losinger wrote:
a very high-level try{ } catch(...) block will catch many of these things

If he wants to catch SEGV errors he has two choices. SEH or SetUnhandledExceptionFiler. No need to confuse him with C++ and C++ exceptions implemented-in-terms-of-SEH-but-still-not-catchable. Smile | :)

If you use SetUnhandledExceptionFiler, take note that the debugger will swollow this when debugging. But since you get tese SEGV's from running client installation I guess debugging isn't of importance, right?

Re: Program crash

Neville Franks28-Jan-03 0:17

Neville Franks

28-Jan-03 0:17

There are quite a number of articles around about this. eg. http://www.codeproject.com/useritems/crash_report.asp[^]

John Robbins has a good Bugslayer column on MSJ and has a good book on debugging available. See http://msdn.microsoft.com/default.asp[^] and search for Bugslayer. Also see: http://msdn.microsoft.com/msdnmag/issues/02/03/Hood/default.aspx[^].

Also see the "Surviving the Release Build" article here on CP.
And there's more...

But as Chris said, find and fix the problems before they get to the poor old customer.

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

Inverse Hyperbolic Sine?

kbmuri27-Jan-03 18:05

kbmuri

27-Jan-03 18:05

I'm looking for a source code snippet for calculating the inverse hyperbolic sine of a number. I.e. an implementation of "double __cdecl asin(double);". It's not a member of <math.h>. Can anyone help?

C^hris L^osinger27-Jan-03 19:20

27-Jan-03 19:20

found this on Google:

asinh(X) = Log(X + Sqr(X * X + 1))
acosh(X) = Log(X + Sqr(X * X - 1))
atanh(X) = Log((1 + X) / (1 - X)) / 2

-c

ILockBytes

Re: Inverse Hyperbolic Sine?

kbmuri27-Jan-03 19:51

kbmuri

27-Jan-03 19:51

Thanks, Chris!

Setting Mouse cursor

Mahesh Varma27-Jan-03 17:47

Mahesh Varma

27-Jan-03 17:47

hi,

I want to set the mouse cursor to "Hand" when it moves over a button ,placed in a dialog.I did'nt find any mouseover message for button in the class wizard.Can any one help me..please..

Mahesh

Re: Setting Mouse cursor

Rage27-Jan-03 20:52

Rage

27-Jan-03 20:52

There is no OnMouseOver function in MFC like the wellknown one used in another language Poke tongue | ;-P

. Basically, you'll have to create it yourself. Let's go.

Create a class derived from CButton, for example CMyButton (use the class wizard).
Get a control asociated to your button( use again the class wizard - Add Value, do not forget to switch the combo to "Control"), f.e. m_MyButton.

Change the line CButton m_MyButton to CMyButton m_MyButton.

Now, right click on CMyButton in your class browser, and chose Windows Messages. DoubleClick on WM_SETCURSOR so as to create the OnSetCursor function.Then, in CMyButton::OnSetCursor([some stuff i can't rememeber]), load your new cursor, and comment out the line where the base class function is called (i.e. do not return what is originally returned), otherwise your own cursor won'T appear.

To sum up, what you did is :

Create your own CButton derived class named CMyButton.
Create a control, replace the original CButton using your class CMyButton.
In this class, handle the WM_SETCURSOR message with the overriding CMyButton::OnSetCursor() function.
DO not forget to comment the last line out.

Hope this helps.

~RaGE();

Re: Setting Mouse cursor

Mahesh Varma29-Jan-03 16:14

Mahesh Varma

29-Jan-03 16:14

Thanks Rage...Thanks a lot.. Smile | :)

Setting cursor for CRectTracker

Quek Khoo Boon27-Jan-03 16:37

Quek Khoo Boon

27-Jan-03 16:37

Hi :

I have a question on OnSetCursor for CRectTracker. During tracking, it shows the resize arrows when the mouse pointer is at the edges. Such as <->.

How do I overwrite this if I want it to display another icon, maybe a different color hand ?

The CRectTracker->OnSetCursor function returns only a BOOL, so I suppose the cursor is not set there.

Any pointers will be appreciated.

Re: Setting cursor for CRectTracker

Rage27-Jan-03 20:53

Rage

27-Jan-03 20:53

Quek Khoo Boon wrote:
The CRectTracker->OnSetCursor function returns only a BOOL, so I suppose the cursor is not set there.

It is. Override this function, comment out last line, and set your own cursor in it.

~RaGE();

pointer to CDocument

raner27-Jan-03 15:32

27-Jan-03 15:32

Hi
A beginner here.We always use GetDocument() function of CView class to retrieve a pointer to the CDocument class. However this time, i need to get the pointer from a CObject derived class. But i've no idea how to do that at all. Can anyone help?

Anyway i always wondered whether i should always place my data in the CDocument class. Because OOD seems to dictate that data should be contained in its own relevant classes for encapsulation. However the Document-View architect seem to suggest placing all data in the CDocument class. Any comments to help me resolve this paradox?

thks
moo

C^hris L^osinger27-Jan-03 15:58

27-Jan-03 15:58

raner wrote:
Any comments to help me resolve this paradox?

there's no paradox. the "document" in doc-view is the data. the doc itself can contain other classes to actually hold the data (like arrays or whatnot), but the CDocument class is (theoretically) supposed to be the embodiment of your data. the view is just a way to look at the data.

raner wrote:
i need to get the pointer from a CObject derived class

the easiest way is to just carry around a pointer to your CDocument. but, you can also get a pointer to the current doc via CFrameWnd::GetActiveDocument (and you can get the frame wnd from CWinApp).

-c

Zzzzz...

raner27-Jan-03 16:37

27-Jan-03 16:37

but my class is CObject derived, so how do i make use of CFrameWnd::GetActiveDocument to import the pointer? thks thks

To carry around the pointer, do you mean something like the below codes?

In CView class:

CPgmDoc* pDoc= (CPgmDoc*) GetDocument();
CMyObject *pMyObject= new CMyObject;
pMyObject->SetDocument(pDoc);

In CMyObject:

void CMyObject::SetDocument(CRainAttDoc *pDocument)
{
pDocument=pDoc;

}

thks for the help.Sorry if this seems painfully elementary;P

C^hris L^osinger27-Jan-03 17:23

27-Jan-03 17:23

yeah something like that. (carrying it around).

raner wrote:
so how do i make use of CFrameWnd::GetActiveDocument to import the pointer?

something like this:

// get main frame
CMDIFrameWnd *pFrame = (CMDIFrameWnd*)AfxGetApp()->m_pMainWnd;

// Get the active MDI child window.
CMDIChildWnd *pChild = (CMDIChildWnd *) pFrame->GetActiveFrame();

CDocument *pDoc = pChild->GetActiveDocument();

this only gets the "active" document, so it might not do exactly what you want.

ILockBytes

raner27-Jan-03 18:36

27-Jan-03 18:36

Hi
I'm working on a SDI project.After looking through my program, i still dont know how to adapt it to SDI project, since there's no m_pMainWnd variable in the CWinApp class. And i'm not sure if GetActiveDocument(); is relevant for a SDI?

thks thks

C^hris L^osinger27-Jan-03 19:30

27-Jan-03 19:30

raner wrote:
since there's no m_pMainWnd variable in the CWinApp class

here's it is, more generic :

 CWnd *p = AfxGetMainWnd()->GetActiveWindow();
 if (p->IsKindOf(RUNTIME_CLASS(CFrameWnd)))
 {
    CFrameWnd *pfr = (CFrameWnd *)p;
    CDocument *pdoc = pfr->GetActiveDocument();
}

-c

ILockBytes

raner29-Jan-03 6:27

29-Jan-03 6:27

Hi
i tried the easy method of carrying the pointer around as follows.But it is not working.

In CView class:

CRainAttDoc* pDoc= (CRainAttDoc*) GetDocument();<br />
CMyObject *pMyObject= new CMyObject;<br />
pMyObject->SetDocument(pDoc);<br />
pMyObject->ShowGraph()

In CMyObject.h

private:<br />
CRainAttDoc* pDoc;

In CMyObject.cpp:

void CMyObject::ShowGraph()<br />
{<br />
CSRawDataArray &dataArray = ((CRainAttDoc*)pDoc)->GetRawDataArray();<br />
}<br />
<br />
<br />
void CMyObject::SetDocument(CRainAttDoc *pDocument)<br />
{<br />
pDoc=(CRainAttDoc*) pDocument;<br />
}

where CSRawDataArray is a CArray template and GetRawDataArray() is a function of CRainAttDoc which returns a CSRawDataArray.

While debugging, the SetDocument function is found to record the pDoc pointer correctly.However when the pgm runs to the ShowGraph() function, the pDoc became incorrect.

know what's wrong?

thks alot!

C^hris L^osinger29-Jan-03 12:22

29-Jan-03 12:22

i don't see anything wrong with that code.

??

-c

A | B - it's not a choice.