C / C++ / MFC

Re: how does a CDialog derived window notify the parent it was closed?

30-Mar-06 9:39

Ok, so then why are you wanting/needing to assign NULL to the dialog pointer?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

ns30-Mar-06 10:12

30-Mar-06 10:12

I have code like

               if(!m_tgtInfo)
{
    m_tgtInfo = new CTargetInfo(this);
    if(!m_tgtInfo) return CDialog::OnCommand(wp, lp);
    m_tgtInfo->Create(IDD_DLGTGTINFO, (CWnd*)this);
    m_tgtInfo->ShowWindow(SW_SHOW);
}

so if someone does away with the m_tgtInfo window then the next time I enter this function, I want to pop up a new CTargetInfo window. If m_tgtInfo is not set to null by somebody I'll never enter the block to create a new window.
Hope this makes sense.
APpreciate your input!
sb

Re: how does a CDialog derived window notify the parent it was closed?

David Crow30-Mar-06 10:27

Re: how does a CDialog derived window notify the parent it was closed?

30-Mar-06 10:27

In the modeless dialog's PostNcDestroy() method, right before deleting the this pointer, send the parent a UDM indicating that the dialog is just about to be destroyed. In the parent's handler for the UDM, assign NULL to m_tgtInfo.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

ns30-Mar-06 10:41

30-Mar-06 10:41

Will do. Thanks.

'buffer' was corrupted?

Yonggoo30-Mar-06 8:50

Yonggoo

30-Mar-06 8:50

Hi,
I am having this run time error message.
Run-Time Check Failure #2 - Stack around the variable 'buffer' was corrupted.
It makes sense for me, but
Anybody could give me some detail ideas about this error message?
Thanks!

Yonggoo

Re: 'buffer' was corrupted?

David Crow30-Mar-06 9:32

Re: 'buffer' was corrupted?

30-Mar-06 9:32

Yonggoo wrote:
It makes sense for me, but
Anybody could give me some detail ideas about this error message?

If it makes sense for you, what further explanation do you require?

See here for possibilities.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Sam Hobbs20-Jun-07 10:30

Sam Hobbs

20-Jun-07 10:30

See where?

I am not the person that asked this question, but I have done many searches. I find a few questions in other sites and many in this site about this specific error message, but there is nothing that provides a diagnostic solution. In other words, nowhere is there something explaining how to diagnose this problem. It is easy to say to search for answers and I have provided that answer to to others many times before in other forums. Yet in this situation, the answer is not easy to obtain by simply searching. So did you look to see if your answer is any help? I think not. I think you were stuck in the mode of saying to search, but you don't really know the answer and did not look to see if searching has any value for this problem.

Is it safe to perform "delete this" in class member functions.

Ajax9530-Mar-06 8:39

Ajax95

30-Mar-06 8:39

I see "delete this" in a lot of code. For example, in an SDI application, when user clicks on a button on the view, the application needs to swap to a different view. so it will delete the current view and create a new view, "delete this" will be performed somewhere near to the end of the message handler of the button, which is a member function. What is the life time of all member variables at this point? Are they all destructed? Does this mean if I'm trying to acces those variables right after the "delete this", the application might crash?

Thanks!

Re: Is it safe to perform "delete this" in class member functions.

David Crow30-Mar-06 9:29

Re: Is it safe to perform "delete this" in class member functions.

30-Mar-06 9:29

You'll also see delete this in the context of modeless dialog boxes.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Stephen Hewitt30-Mar-06 11:16

Stephen Hewitt

30-Mar-06 11:16

You can call delete this from a member function: After doing so you can't access any member variables or call any non-static member functions that do as the memory for the class instance has been returned to the heap from whence it came and the class invariants have no doubt been invalidated by the destructor.

Steve

Add items in list box

celllllllll30-Mar-06 7:28

30-Mar-06 7:28

Hi All,

I am creating a list box with multiple selection at a time.
I would appreciate if someone let me know how to add items in LIST BOX using MFC.

For example: I need to add USA, CANADA, MEXICO, ENGLAND, INDIA, CHINA in my list.
How to add these itmes?
Do I need to write code or just can do it other way?

Thanks in advance

MFC

David Crow30-Mar-06 7:34

30-Mar-06 7:34

Preeti9 wrote:
I would appreciate if someone let me know how to add items in LIST BOX using MFC.

Use CListBox::AddString() or CListBox::InsertString().

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

celllllllll30-Mar-06 7:59

30-Mar-06 7:59

Thanks for your help.

Should it be like this:

[\code]
CListBox::AddString()
{
AddString("USA");
AddString("CANADA");
.....

..
}

C++Prog

David Crow30-Mar-06 8:06

30-Mar-06 8:06

No. You will need a CListBox control variable (use ClassWizard for this), then call AddString() in the context of that variable.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

celllllllll30-Mar-06 8:09

30-Mar-06 8:09

O okay, Thanks...I got it.

Thanks once again

MFC

Maximilien30-Mar-06 7:37

Maximilien

30-Mar-06 7:37

if the content is static ( will be filled once with constant values ) then, you can add them directly in the resource editor ( no code needed for that ).

if the contenct is dynamic, you can use CListBox::AddString or CListBox::InsertString ( you need to code this ).

Maximilien Lincourt
Your Head A Splode - Strong Bad

celllllllll30-Mar-06 8:07

30-Mar-06 8:07

Thanks for your reply.

Yes, the content is Static. Can you please give me some idea how to add this in resource editor.

Thanks Once Again

MFC

David Crow30-Mar-06 9:09

30-Mar-06 9:09

Preeti9 wrote:
Yes, the content is Static. Can you please give me some idea how to add this in resource editor.

While it might be considered a neat idea, this solution has many drawbacks. In fact, it is only useful if the items in the control are language independent, and are insensitive to sorting.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

celllllllll30-Mar-06 10:45

30-Mar-06 10:45

Hmmm, Thanks I got it.

MFC

Hamid_RT30-Mar-06 17:44

Hamid_RT

30-Mar-06 17:44

Like this
CListBox m_List;
m_List.AddString("123");
m_List.InsertString(1,"2323");

Testing if a file exists

Rage30-Mar-06 7:08

Rage

30-Mar-06 7:08

What is the best way to do it (VC++6.0 + MFC +Dialogapp) ?

~RaGE();

David Crow30-Mar-06 7:35

30-Mar-06 7:35

I use _access(), which is really just a wrapper around GetFileAttributes().

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Ajax9530-Mar-06 8:41

Ajax95

30-Mar-06 8:41

You can use CFile::GetStats() to retirve the status of a file, if it exist.

David Crow30-Mar-06 9:11

30-Mar-06 9:11

Ajax95 wrote:
You can use CFile::GetStats()...

From whence does this method exist? Confused | :confused:

Perhaps you meant CFile::GetStatus() instead.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb