Re: Question about classes in C++ - C / C++ / MFC Discussion Boards

akirilov31-Mar-09 22:49

31-Mar-09 22:49

Hi guys,

I have 2 classes:

 class A{
  virtual void Paint() {...}
}

class B: public A{
  virtual void Paint() {...}
}

Is it possible and what I have to do, so in B.Paint to invoke A.Paint and then some other code

Re: Question about classes in C++

Cedric Moonen31-Mar-09 22:52

Cedric Moonen

31-Mar-09 22:52

akirilov wrote:
so in B.Paint to invoke A.Paint and then some other code

Yes:

void B::Paint() 
{
   A::Paint();
   // Other stuff here...
}

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Question about classes in C++

Stuart Dootson31-Mar-09 22:53

Stuart Dootson

31-Mar-09 22:53

akirilov wrote:
in B.Paint to invoke A.Paint and then some other code

Implement B::Paint like this:

void B::Paint()
{
   A::Paint();
   // Do some B specific stuff.
}

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Question about classes in C++

Code-o-mat31-Mar-09 22:55

Code-o-mat

31-Mar-09 22:55

class A{
  virtual void Paint() {...}
}

class B: public A{
  virtual void Paint() 
  {
    A::Paint();
    ...
  }
}

You can also use __super (if available) like:

class B: public A{
  virtual void Paint() 
  {
    __super::Paint();
    ...
  }
}

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: Question about classes in C++

akirilov31-Mar-09 23:10

akirilov

31-Mar-09 23:10

Thank you guys, the answer of all of you was very helpful.

I tried with A.Paint(), but it didn't work.
I'm going to use __super, thus It will not depend of the base class name.

THANK YOU, again!!!

Re: Question about classes in C++

CPallini31-Mar-09 23:25

CPallini

31-Mar-09 23:25

akirilov wrote:
I tried with A.Paint(), but it didn't work.

Possibly because they suggested A<big>::</big>Paint() instead. Roll eyes | :rolleyes:

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.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Question about classes in C++

akirilov1-Apr-09 0:22

akirilov

1-Apr-09 0:22

Well I tried A.Paint() before I posted here Wink | ;)

so, A::Paint() is working fine.

Re: Question about classes in C++

Stuart Dootson1-Apr-09 3:31

Stuart Dootson

1-Apr-09 3:31

akirilov wrote:
I'm going to use __super, thus It will not depend of the base class name.

But it does tie you to Microsoft's compiler...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Question about classes in C++

Rajesh R Subramanian1-Apr-09 1:38

Rajesh R Subramanian

1-Apr-09 1:38

Along with other answers, see the __super[^] keyword. You could call a parent class function by __super::FuncName()

[EDIT] OK, I just read you already are going to settle on this keyword. [/EDIT]

It is a crappy thing, but it's life -^ Carlo Pallini

visual C++ to 8051F000 micro controller

ruthlesspker31-Mar-09 22:37

ruthlesspker

31-Mar-09 22:37

hi guys..i have a program that require me to input user input by textbox and output it to a label...but my superviosr wants me to do it on silabs...this means i have to use serial comm to link it...i know the serial comm coding..now i need to know how to output the user input to the label..i try printf(""); and "label1->text= " but it doesnt work..any helps? Dead | X|

Re: visual C++ to 8051F000 micro controller

Cedric Moonen31-Mar-09 23:00

Cedric Moonen

31-Mar-09 23:00

Are you using MFC ? If yes you have to provide a specific Id to your static control in the resource editor. Then you can do something like this (in your dialog class):
GetDlgItem(ID_YOURID)->SetWindowText(_T("Your text here"));

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: visual C++ to 8051F000 micro controller

CPallini31-Mar-09 23:29

CPallini

31-Mar-09 23:29

ruthlesspker wrote:
hi guys..i have a program that require me to input user input by textbox and output it to a label...but my superviosr wants me to do it on silabs...this means i have to use serial comm to link it...i know the serial comm coding..now i need to know how to output the user input to the label..i try printf(""); and "label1->text= " but it doesnt work..any helps?

How is it related to the microcontroller?

ruthlesspker wrote:
hi guys..i have a program that require me to input user input by textbox and output it to a label...but my superviosr wants me to do it on silabs...

How is it related to the serial communication?

Could you please state more clearly what do you need to do (have you to send the text of an edit box to the microcontroller via the serial port? Should it be formatted in a special way?)?

Smile | :)

Context menu on non clicnt area

john563231-Mar-09 21:16

john5632

31-Mar-09 21:16

Hi,

I have a list view (Report) with 5 colom, I am using a context menu on clicking on any of the row, but the same context menu is also coming for clicking any of the colom.

How can I prevent it to appear on colom?

Re: Context menu on non clicnt area

Code-o-mat31-Mar-09 22:12

Code-o-mat

31-Mar-09 22:12

I supose you are handling the NM_CLICK or NM_RCLICK notification messages for that, with these you get a NMLISTVIEW[^] structure as parameter, right? I belive in this struct iItem should be -1 if the user did not click on a row.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: Context menu on non clicnt area

Iain Clarke, Warrior Programmer31-Mar-09 22:20

Iain Clarke, Warrior Programmer

31-Mar-09 22:20

You get a different structure, but the idea is the same.

Iain.

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job!

Re: Context menu on non clicnt area

john563231-Mar-09 22:56

john5632

31-Mar-09 22:56

I am Handling WM_CONTEXTMENU

Re: Context menu on non clicnt area

Iain Clarke, Warrior Programmer31-Mar-09 23:09

Iain Clarke, Warrior Programmer

31-Mar-09 23:09

Then handle NM_RCLICK instead, as I described.

Alternatively, you can use CTreeCtrl::HitTest to get the item under the mouse, but that's more work.

Iain.

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job!

Re: Context menu on non clicnt area

john563231-Mar-09 23:23

john5632

31-Mar-09 23:23

Thank you

Re: Context menu on non clicnt area

Iain Clarke, Warrior Programmer31-Mar-09 22:19

Iain Clarke, Warrior Programmer

31-Mar-09 22:19

Well, that headers for a list view aren't non-client area - that's like the borders and title bars of your applications.

If you right click (I assume right?), then you get a NM_RCLICK notification. When a list view sends it, you also get a pointer to a NMITEMACTIVATE structure. Looking at that structure, you have a iSubItem member - which is the column number.

Try it, and see for yourself. What if gives you when you click on a header, I don't know.

NM_CLICK gives you the same information on a left click - but it would be a bit unusual for a left click to bring up a menu.

Hope that helps,

Iain.

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job!

Re: Context menu on non clicnt area

Stuart Dootson31-Mar-09 22:24

Stuart Dootson

31-Mar-09 22:24

Iain Clarke wrote:
NM_CLICK gives you the same information on a left click - but it would be a bit unusual for a left click to bring up a menu.

It certainly wouldn't be the most unusual thing ever seen on this forum...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Context menu on non clicnt area

Iain Clarke, Warrior Programmer31-Mar-09 22:27

Iain Clarke, Warrior Programmer

31-Mar-09 22:27

Stuart Dootson wrote:
It certainly wouldn't be the most unusual thing ever seen on this forum...

Talking of which... I haven't seen Carlo yet!

Iain.

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job!

Re: Context menu on non clicnt area

CPallini31-Mar-09 23:40

CPallini

31-Mar-09 23:40

Still wounded Sir, still wounded, indeed... Cry | :((

how to EXPAND or COLLAPSE a CTreeCtrl item?(TVS_SINGLEEXPAND cannot)

kaviniswell31-Mar-09 21:02

kaviniswell

31-Mar-09 21:02

hi,
i want to EXPAND/COLLAPSE an COLLAPSE/EXPAND item when i single-click an item。
and the TVS_SINGLEEXPAND style causes the item being selected to expand and the item being unselected to collapse,but i still want the unselected to keep the old state.

now, i map the NM_CLICK:

<br />
void CTreeControlDlg::OnClickTree1(NMHDR* pNMHDR, LRESULT* pResult) <br />
{<br />
    TRACE("OnClickTree1!\n");<br />
    <br />
    HTREEITEM hItem = m_treeCtrl.GetSelectedItem();<br />
    if ( (hItem != NULL) && m_treeCtrl.ItemHasChildren(hItem))<br />
    {<br />
         ... // but i donot how to do now...<br />
    }<br />
    *pResult = 0;<br />
}<br />

thank u very much!!!

Re: how to EXPAND or COLLAPSE a CTreeCtrl item?(TVS_SINGLEEXPAND cannot)

Stuart Dootson31-Mar-09 22:03

Stuart Dootson

31-Mar-09 22:03

CTreeCtrl::Expand[^]?

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: how to EXPAND or COLLAPSE a CTreeCtrl item?(TVS_SINGLEEXPAND cannot)

kaviniswell31-Mar-09 22:14

kaviniswell

31-Mar-09 22:14

i do like this, but using <bool bexpand=""> is not a good idea.anybody have the right one?thank u!

void CTreeControlDlg::OnClickTree1(NMHDR* pNMHDR, LRESULT* pResult) 
{
    TRACE("OnClickTree1!\n");
 
    CPoint   pt;   
    GetCursorPos(&pt);   
    m_treeCtrl.ScreenToClient(&pt);   
    
    HTREEITEM   hItem   =   m_treeCtrl.HitTest(pt);
//     HTREEITEM hItem = m_treeCtrl.GetSelectedItem();
    if ( (hItem != NULL) && m_treeCtrl.ItemHasChildren(hItem))
    {    
        static BOOL bExpand = FALSE; // problem: when change to another COLLAPSE item, it will 
                                     // still do the Expand(hItem, TVE_COLLAPSE) code, but not
                                     // do the Expand(hItem, TVE_EXPAND) code.how can i change the
                                     // code? thank u!
        if (bExpand)
        {
            m_treeCtrl.Expand(hItem, TVE_COLLAPSE);
            bExpand = FALSE;
        }
        else
        {
            m_treeCtrl.Expand(hItem, TVE_EXPAND);        
            bExpand = TRUE;
        }
    }

	*pResult = 0;
}

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