C / C++ / MFC Discussion Boards

vs2005 migration issue

sdfkfggh13-Jan-07 4:35

13-Jan-07 4:35

Guys,
I ran into this issue during migration of project from .net2003 to vs2005.
Have you guys encountered something similar and fixed the same?

error LNK2019: unresolved external symbol "public: __thiscall std::exception::exception(char const * const &)" (??0exception@std@@QAE@ABQBD@Z) referenced in function "public: __thiscall std::bad_alloc::bad_alloc(char const *)" (??0bad_alloc@std@@QAE@PBD@Z)

error LNK2001: unresolved external symbol "public: __thiscall std::exception::exception(char const * const &)" (??0exception@std@@QAE@ABQBD@Z)

error LNK2001: unresolved external symbol "public: __thiscall std::exception::exception(char const * const &)" (??0exception@std@@QAE@ABQBD@Z)
SharedMemory.obj : error LNK2001:

Vipin

Re: vs2005 migration issue

sdfkfggh13-Jan-07 5:14

sdfkfggh

13-Jan-07 5:14

issue is solved.

Re: vs2005 migration issue

Hamid_RT15-Jan-07 6:48

Hamid_RT

15-Jan-07 6:48

You find your answer Smile | :)

WhiteSky

Is Transition to .NET The general trend?

YoungYong, Park13-Jan-07 3:03

YoungYong, Park

13-Jan-07 3:03

I originally using Visual Basic 6.0 and .NET.
But, I realized vb is had limited.

so, I'm turning to VC++/MFC.

I knew VB's The general trend is transition to .NET
but, I don't know in VC++.

Is VC++'s trend 6.0? or trend is .NET?

I wandering this problem.
I really appreciate, If i had your reply.

thanks~ Smile | :)

Aim High, life is soaring
but, Aim Low, life is boring!

Re: Is Transition to .NET The general trend?

#realJSOP13-Jan-07 3:25

#realJSOP

13-Jan-07 3:25

Always use the correct tool for the job. Personally, I don't think .Net is appropriate for desktop applications, but if the boss says "Use .Net", guess what I'm going to do. In the end, it's all about keeping your job, and maintaining a marketable skill set. You simply have to learn it all. It's fine to be strong in one particular programming language, but you absolutely MUST be at least conversant in most of them.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

How to put the contain of textBox that related in button event to database access

arif_setyawan13-Jan-07 2:33

arif_setyawan

13-Jan-07 2:33

i need your help....
with the script that can connect the contain of textbox after the button event to access database....

please.....

Re: How to put the contain of textBox that related in button event to database access

Hamid_RT15-Jan-07 6:47

Hamid_RT

15-Jan-07 6:47

Do you want to insert a text(of editbox) to a database?

WhiteSky

XFS API

Ghous Ahmed13-Jan-07 2:33

Ghous Ahmed

13-Jan-07 2:33

Can anyone have the idea of calling XFS API in .net (C#). Smile | :)

Re: XFS API

Hamid_RT13-Jan-07 2:41

Hamid_RT

13-Jan-07 2:41

I think you selected wrong forum here c++ Smile | :)

WhiteSky

Re: XFS API

viewman4-Jul-12 20:54

viewman

4-Jul-12 20:54

Hi,I have met the same confuse like you ? have you found the solution? please give me some help,thank you very much

how to retrieve the application running in a remote computer?

vedhapsg12-Jan-07 22:51

vedhapsg

12-Jan-07 22:51

hi sir..
i am beginner of MFC.so please tell me a possible way to retrieve the applications running in the remote system...please reply me as soon as possible....

Re: how to retrieve the application running in a remote computer?

Don Box12-Jan-07 22:58

Don Box

12-Jan-07 22:58

Do u know how to retrieve the application running on a local computer?
As u r a novice, don't go beyond very advance level, I recommend.

Come online at:-
jubinc@skype

Re: how to retrieve the application running in a remote computer?

vedhapsg12-Jan-07 23:09

vedhapsg

12-Jan-07 23:09

hi sir...
thanks for ur advice...
but i need to implement it in my project...so please give me a suggestion to find the same..please tell me how to retrieve in the local system too..interested in knowing that also.. please reply me sir...

thanking u..

Re: how to retrieve the application running in a remote computer?

Cristian Amarie13-Jan-07 4:29

Cristian Amarie

13-Jan-07 4:29

Check the sample ProcessViewer from Platform SDK. It does exactly what you need.

And, by the way, "please reply me as soon as possible" won't get you many replys. This time you were lucky, but next time you may get flames. Or get ignored.

Nuclear launch detected

OnClose Call Multiple Times

User 1278212-Jan-07 21:16

User 12782

12-Jan-07 21:16

When the user in my application chooses exit from the menu, hits escape, or presses the X, I want my application to cleanup memory before closing. Usually I just put the cleanup code in the OnClose message handler. From a log file the cleanup generates, the OnClose gets called multiple times and my application crashes during the cleanup, attempting to delete the same memory multiple times.

I've tried hackish solutions that include setting a flag the first time the function is called and just returning the next time, but then the window never closes. There is nothing in my cleanup that would call OnClose() again.

Any ideas on how to approach fixing this? The debugger isn't being terribly useful.

Thanks

modified 12-Jul-20 21:01pm.

Re: OnClose Call Multiple Times

CPallini12-Jan-07 21:48

CPallini

12-Jan-07 21:48

Aaron Stubbendieck wrote:
the OnClose gets called multiple times

Have you missing the call of the base class OnClose() in your handler, haven't you?

Aaron Stubbendieck wrote:
crashes during the cleanup, attempting to delete the same memory multiple times.

Use the following behaviour when performing cleanup:

if ( pSomeObject )
{
   delete pSomeObject;
   pSomeObject = NULL;
}

At least, this avoids program crashes due to multiple delete calls.

Smile | :)

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: OnClose Call Multiple Times

Hadi Dayvary12-Jan-07 21:49

Hadi Dayvary

12-Jan-07 21:49

Hi Why you don't put your cleanups in your destructor function?

Re: OnClose Call Multiple Times

#realJSOP12-Jan-07 23:39

#realJSOP

12-Jan-07 23:39

Because some objects need to be cleaned up in OnClose. I have a perfect example of that - we have a timer thread that runs from program start to program end. We have to kill and delete the thread in OnClose because the thread needs to delete an array that uses pointers to statusbar panes which have already been "cleaned up" by the app by the time the destructor is called for CMainFrame.

So you see, everybody's needs are different. Asking why a programmer needs to do something does NOT help him. If you don't know the answer, or can't otherwise contribute something useful to the thread, at least resist the urge to ask stupid questions.

Re: OnClose Call Multiple Times

Don Box12-Jan-07 22:09

Don Box

12-Jan-07 22:09

"From a log file the cleanup generates"?????
What's happening, mention clearly? How OnClose is getting called more than once?

Anyway, the other way is, Override CWinApp::ExitInstance(). Here, u can place clean up codes.

Come online at:-
jubinc@skype

Re: OnClose Call Multiple Times

#realJSOP12-Jan-07 23:53

#realJSOP

12-Jan-07 23:53

Are you putting the OnClose handler in each view or in CMainFrame?

If it's just in CMainFrame, it will only be called once. If it's in your view class, it will be called for every instance of your view object.

If you're cleaning up poointers that are global to your app or that are instantiate in your app or mainframe class, you should handle the OnClose only in CMainFrame. If you need to cleanup pointers that are local to your view object, you need to handle OnClose in the view as well.

Re: OnClose Call Multiple Times

User 1278217-Jan-07 10:31

User 12782

17-Jan-07 10:31

Sorry, forgot to mention, I'm doing this in a dialog application. So it was in the CMyDlg::OnClose().

As somebody else mentioned, I have set the pointer to NULL after deleting it, but that doesn't seem to work either:

if(pPtr!=NULL)
{
delete pPtr;
pPtr=NULL;
}

Any ideas?

modified 12-Jul-20 21:01pm.

Re: OnClose Call Multiple Times

Gary R. Wheeler13-Jan-07 2:52

Gary R. Wheeler

13-Jan-07 2:52

One other thing, which no one has mentioned: When you delete an object, reset the pointer to NULL:

void MyApp::OnClose()
{
    delete MyObj;
    MyObj = NULL;
}

It's perfectly legal to issue a delete against a NULL pointer. This also removes the need to check the pointer value first as well.

Software Zen: delete this;

Fold With Us![^]

Re: OnClose Call Multiple Times

#realJSOP13-Jan-07 3:31

#realJSOP

13-Jan-07 3:31

A long time ago, I got in the habit of checking to make sure the pointer needed to be deleted before deleting it, and then setting it to null (even in the destructor of the container class). The old ways are the best ways. Smile | :)

Re: OnClose Call Multiple Times

Gary R. Wheeler13-Jan-07 4:02

Gary R. Wheeler

13-Jan-07 4:02

Yeah, I know. I was in the same habit from my 'C' days. The 'delete NULL' thing only works in C++ AFAIK. In C, calling free(NULL); had unpredictable results, depending upon the run-time library implementor. I would imagine it's part of the standard, now.

Software Zen: delete this;

Fold With Us![^]

How to change the Dialog's caption

Mushtaque Nizamani12-Jan-07 19:59

Mushtaque Nizamani

12-Jan-07 19:59

Hi,

How to change the dialog's caption at run time, I tried this by calling
(GetDlgItem(IDD_DIALOGiID))->SetWindowText("Test Dialog Caption") in OninitDialog method, but it is not working.

Warm Regards,
Mushq

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