C / C++ / MFC

vtable Table for CLASS [modified]

14-Jul-06 9:14

Can you explain how you to use your activex

whitesky

AmarnathSujji14-Jul-06 1:33

AmarnathSujji

14-Jul-06 1:33

Hi,

If I have classes like this
class A
{
virtual void fun();
void gun(int);
int i, j;
}
class B : public A
{
virtual void fun1();
virtual void fun();
void gun(int);
virtual void run(int);
int i, j;
}

main()
{
A a;
B b;
}

Now how many vtable will create here.

-- modified at 2:17 Monday 17th July, 2006

Re: vtable Table for CLASS

_AnsHUMAN_ 14-Jul-06 2:18

_AnsHUMAN_

14-Jul-06 2:18

Where is the class B?
If you have mistyped it , it should be like
class B:public A
Then In this case two VTABLEs will be created one for each class .
A VTABLE is created for each class containing a virtual function and for each of the class that is derived from it.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: vtable Table for CLASS

Sarvan AL14-Jul-06 2:38

Sarvan AL

14-Jul-06 2:38

Hi Anshuman,

In this case, how many v-tables will be crated? (Means, the derived class doesn't have its own virtual fn.s.)

class A
{
virtual void fun();
void gun(int);
int i, j;
}

class B : public A
{
void gun(int);
int i, j;
}

Thanks in advance,
Sarvan AL

Re: vtable Table for CLASS

Stephen Hewitt14-Jul-06 3:30

Stephen Hewitt

14-Jul-06 3:30

In this example only one vtable will be created which (ignoring RTTI) will contain a pointer to the single virtual function A::fun. The constructor (implicitly generated by the compiler) will set the vtable pointer in class A's instance data to point to this table. If B had overridden this method then there would be another vtable for class B and B's constructor would replace the vtable pointer (set in A) with a pointer to B's vtable.

Steve

close all child windows in MDI

zeus_master14-Jul-06 0:48

zeus_master

14-Jul-06 0:48

how to close all child windows in MDI?

like the VC->windows->Close All Sniff | :^)

Re: close all child windows in MDI

Farhat Aisha14-Jul-06 1:03

Farhat Aisha

14-Jul-06 1:03

use AfxGetApp()->CloseAllDocuments(FALSE)

Resizing an image to a Thumbnail

racing5714-Jul-06 0:42

racing57

14-Jul-06 0:42

Hi everyone, i need to resize an image(sizes vary) to a thumbnail so that i can add it to an image list for a list box, what is the best way to do it.... any help would be much appreciated.

the image list and the list box work fine, but i am unable to resize the image. so when it is displayed you just see the top left hand corner of the image.

Thanks in advance

Lee

Re: Resizing an image to a Thumbnail

Farhat Aisha14-Jul-06 1:18

Farhat Aisha

14-Jul-06 1:18

You have to create a thumbnail image by your self. Here is the code snippet for that

//lets say your original image is in BitmapOrg
BITMAP BmpInfo;
BitmapOrg.GetBitmap(&BmpInfo);

CDC *pDC=GetDC();
CDC MemDC,MemDC2;
if (MemDC.CreateCompatibleDC(pDC) && MemDC2.CreateCompatibleDC(pDC))
{
CBitmap Bitmap;
CSize szThumbnail(32,32);
if (Bitmap.CreateCompatibleBitmap(pDC,szThumbnail.cx,szThumbnail.cy))
{
CBitmap* pbmpOld=MemDC.SelectObject(&Bitmap);
CBitmap* pbmpOld2=pDC->SelectObject(&BitmapActual);
MemDC.StretchBlt(0,0,szThumbnail.cx,szThumbnail.cy,0,0,BmpInfo.bmWidth,BmpInfo.bmHeight,SRCCOPY); //this function will create a thumbnail

MemDC.SelectObject(pbmpOld);
MemDC2.SelectObject(pbmpOld2);
}
MemDC.DeleteDC();
MemDC2.DeleteDC();
}
ReleaseDC(pDC);

Re: Resizing an image to a Thumbnail

Hamid_RT14-Jul-06 2:21

MessageBox Without any Button

14-Jul-06 2:21

I think if you use StretchBltfor change size not good
see (of course its a suggestion)

<br />
	CRect			rect;<br />
	Image			*img ;<br />
	ImageAttributes	imAttrib; <br />
<br />
	Graphics graphics(GetDC()->m_hDC) ;<br />
	GetWindowRect(rect);<br />
	ScreenToClient(rect);<br />
img = Image::FromFile(L"D:\\0.bmp") ;<br />
graphics.DrawImage(img,Rect(0,0,rect.right/2,rect.bottom/2),<br />
0,0,img ->GetWidth(),img ->GetHeight(),<br />
UnitPixel,&imAttrib);<br />

whitesky

Manjunath S14-Jul-06 0:39

Manjunath S

14-Jul-06 0:39

Hi,
I Have used
MessageBox(NULL,"Please wait","Information",MB_OK).
to display message box in win32 DLL.

But now i need display a Message Box without any button ,i.e This message box should disappear itself after few seconds ...

Manjunath S
GESL
Bangalore

zeus_master14-Jul-06 0:44

zeus_master

14-Jul-06 0:44

;Pcreate a dialog, and use time event......

Aqueel14-Jul-06 2:06

Aqueel

14-Jul-06 2:06

Make a dialog box as you want. Now create this dialog using DoModal() in a thread function. Just initiate that thread when you want to show that dialog and kill the thread when you want to make the dialog disappeared.
Good luck

We Believe in Excellence
www.aqueelmirza.cjb.net

Hamid_RT14-Jul-06 2:22

14-Jul-06 2:22

for this purpose i think you need to create your dialog instead messagebox

whitesky

how can list box display other language?

David Crow14-Jul-06 3:34

David Crow

14-Jul-06 3:34

See here.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

mimimimilaw14-Jul-06 0:09

mimimimilaw

14-Jul-06 0:09

Dear all,
I am doing a list box project but it need to show non-english word such as Japanese and German. How can the list box support on it???? Because it show "$de2&" now... D'Oh! | :doh:

THx a lot

Maxwell Chen14-Jul-06 0:39

Maxwell Chen

14-Jul-06 0:39

Unicode .... :->

Maxwell Chen

eusto14-Jul-06 1:05

eusto

14-Jul-06 1:05

Add unicode support for your application

Hamid_RT14-Jul-06 2:30

14-Jul-06 2:30

See http://www.codeproject.com/file/ANSI-UNICODE_conversion.asp[^] maybe it is some helpful to you

whitesky

mimimimilaw14-Jul-06 19:04

mimimimilaw

14-Jul-06 19:04

my word is unicode already.....I don't know why it can't display in the list box???? Frown | :(

Hamid_RT15-Jul-06 6:08