vtable Table for CLASS [modified] - C / C++ / MFC Discussion Boards

Re: SOCKET MESSAGES

led mike14-Jul-06 6:09

led mike

14-Jul-06 6:09

They hide that information in the DOCUMENTATION[^]

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

doubt on Activex control

sunita ramesh14-Jul-06 0:34

sunita ramesh

14-Jul-06 0:34

Hello all,

I have an activex control,which is a video player plays .cam files.I run this activex control using IE.Everything is working good.

The problem is, if i open two windows(IE) at a time,one is crashing and showing error.how to overcome this problem..

Giv me some ideas..

Thanks in advance

Sunita

Re: doubt on Activex control

David Crow14-Jul-06 2:31

David Crow

14-Jul-06 2:31

What does your video player do when a second instance is started?

"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

Re: doubt on Activex control

sunita ramesh15-Jul-06 1:06

sunita ramesh

15-Jul-06 1:06

hi,

when the second instance gets started,a new player will be downloaded again.As soon as the new player downloads,the older player is crashed and the new player starts playing the old cam file.

Any solution for this..

thanks in advance

sunita

Re: doubt on Activex control

Zac Howland14-Jul-06 5:56

Zac Howland

14-Jul-06 5:56

This question would probably be better answered in the COM forum ... but here goes:

Is this an OCX, DLL, or EXE? Specifically, is it running in process or out of process? If it is running in process, you shouldn't have this problem ... but if you do, chances are it is due to holding onto the sound or video resources so that another instance cannot access them. If it is out of process, are you starting a new instance for each time it is instantiated, or are you trying to use the same instance?

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: doubt on Activex control

sunita ramesh15-Jul-06 1:23

sunita ramesh

15-Jul-06 1:23

hi Zac,

Thanks for ur reply..

I am using dll of the activex control.I give its classId in <object> in HtmlPage(IE).
So whenver i open the IE page,Activex control Dll is downloded and then player starts downloading cam file and plays it.
So if i again open IE page,a new instance is instantiated and new player opens.This player uses the same Dll and starts downloading the cam file.

The problem is,as soon as 2nd player opens,the first player is crashing.

Any solution for this..

Thanks in advance

sunita

Re: doubt on Activex control

Hamid_RT14-Jul-06 8:14

Hamid_RT

14-Jul-06 8:14

Can you explain how you to use your activex

whitesky

vtable Table for CLASS [modified]

AmarnathSujji14-Jul-06 0:33

AmarnathSujji

14-Jul-06 0:33

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 1:18

_AnsHUMAN_

14-Jul-06 1:18

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 1:38

Sarvan AL

14-Jul-06 1:38

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 2:30

Stephen Hewitt

14-Jul-06 2:30

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_master13-Jul-06 23:48

zeus_master

13-Jul-06 23:48

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 0:03

Farhat Aisha

14-Jul-06 0:03

use AfxGetApp()->CloseAllDocuments(FALSE)

Resizing an image to a Thumbnail

racing5713-Jul-06 23:42

racing57

13-Jul-06 23:42

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 0:18

Farhat Aisha

14-Jul-06 0:18

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 1:21

Hamid_RT

14-Jul-06 1:21

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

MessageBox Without any Button

Manjunath S13-Jul-06 23:39

Manjunath S

13-Jul-06 23:39

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

Re: MessageBox Without any Button

zeus_master13-Jul-06 23:44

zeus_master

13-Jul-06 23:44

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

Re: MessageBox Without any Button

Aqueel14-Jul-06 1:06

Aqueel

14-Jul-06 1:06

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

Re: MessageBox Without any Button

Hamid_RT14-Jul-06 1:22

Hamid_RT

14-Jul-06 1:22

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

whitesky

Re: MessageBox Without any Button

David Crow14-Jul-06 2:34

David Crow

14-Jul-06 2:34

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

how can list box display other language?

mimimimilaw13-Jul-06 23:09

mimimimilaw

13-Jul-06 23:09

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: