C / C++ / MFC

10-May-06 22:15

((CEchoServerDlg*)m_pDlg)->OnAccept()

Nilesh Korpe

Cedric Moonen10-May-06 22:18

10-May-06 22:18

Nilesh Korpe wrote:
((CEchoServerDlg*)m_pDlg

This is simply a casting: the m_pDlg variable (stored probably as a CDlg* pointer) is casted to the type CEchoServerDlg so you can access functions defined in that class.
Then, with this casted pointer, you call the OnAccept function of the class.

Scorpio10-May-06 22:26

10-May-06 22:26

Where can I find good info on casting I think I am always confused with it.

Sara

-- modified at 4:27 Thursday 11th May, 2006

Cedric Moonen10-May-06 22:32

10-May-06 22:32

Nilesh Korpe wrote:
Where can I find good info on casting

This is C style casting and you won't find a lot of information about that, simply because it is a simple principle: you just 'transform' a variable type into another. What don't you understand here ?

Anyway, if you want a good article on C++ casting, I suggest this one[^] but I think it's no really what you are looking for.

ThatsAlok11-May-06 4:59

ThatsAlok

11-May-06 4:59

Cedric Moonen wrote:
suggest this one[^] but I think it's no really what you are looking for.

Managed in Unmanaged Forum Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Cedric Moonen11-May-06 5:02

11-May-06 5:02

These casting operators are C++ standard Wink | ;)

Dynamic creation of controls

Stephen Hewitt11-May-06 2:41

Stephen Hewitt

11-May-06 2:41

This basically is "saying" the following:
"Regardless of the type of the variable m_pDlg points to treat it as if it was a CEchoServerDlg; call the OnAccept method through this pointer."
This will obviously cause problems if you cast an object into something its not.

For example:

// Bad code.
CRect rc;
CRect *pNotAWindowAtAll = &rc;
DWORD dwStyle = ((CWnd*)pNotAWindowAtAll)->GetStyle();

This code will compile and run. At best it will crash at runtime and at worst it will not: it will not work correctly and it makes no sense whatsoever. A C-style cast like this just pretends that a CRect is a CWnd but the two classes are not related and it will end in tears. A cast like that is saying to the compiler, "just do what I say".

I often go on about this, but in my opinion (and that of most modern C++ programming books) the C-style cast has no place in modern C++ code. You should use something like this instead:

static_cast<CEchoServerDlg*>(m_pDlg)->OnAccept();

A static_cast will limit the type of cast. It will only cast between related classes, perform standard conversions and call user defined conversion operators. If used in my "bad code" example it will not compile - this is good: nonsense shouldn't compile.

Steve

Scorpio10-May-06 22:08

Re: Dynamic creation of controls

10-May-06 22:08

If user create's some Button controls dynamically using create and assign them some perticular function and settings,how to reload this settings after restarting the application.Because If I restart the application all the dynamic controls will be lost.

Nilesh Korpe

Cedric Moonen10-May-06 22:13

Re: Dynamic creation of controls

10-May-06 22:13

Nilesh Korpe wrote:
how to reload this settings after restarting the application

Simply save the data in a file and load the data at application startup.

Scorpio10-May-06 22:18

how tocopy a file to specific folder in ftp

10-May-06 22:18

Thank you
I think that is the only solution ,

Nilesh Korpe

-- modified at 4:19 Thursday 11th May, 2006

Vivek krishna10-May-06 21:36

Vivek krishna

10-May-06 21:36

I checked many functions to do the same but i could not... i want the help to copy a folder and a file to another folder using a FTP connection... can any one help to do the same...awaiting your reply

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer10-May-06 22:44

10-May-06 22:44

You need to look at CFtpConnection::SetCurrentDirectory[^].

Iain.

Vivek krishna10-May-06 22:51

Vivek krishna

10-May-06 22:51

i tried it but unable to copy a file in the specified folder.pls send me example if possible.

Hamid_RT10-May-06 23:04

Hamid_RT

10-May-06 23:04

See Transfer Files to and from an FTP Server[^]

Dialog with background as Image?

Ganesh_T11-May-06 2:13

Ganesh_T

11-May-06 2:13

PLease see MSDN:

CInternetSession and
CFTpConnection
CFtpFileFind

You will get everything in MSDN with the samples....

Cheers
"Peace of mind through Technology"

Andy Rama10-May-06 21:19

10-May-06 21:19

Hi,
   Is there any way to set the backgroud as an Image to a Dialog?

Nishad S10-May-06 21:36

10-May-06 21:36

Sure... you can do it by drawing the image on OnEraseBkgnd or OnPaint, or by placing a picture static control with the same size of the dialog. Smile | :)

- NS -

Andy Rama10-May-06 21:48

10-May-06 21:48

Hi,
   It is working. But when I try to add 'Microsoft FlexGrid Control, Version 6.0' on that dialog & run the application; then FlexGrid Control is not visible on that dialog.

   Do you have any solution to show FlexGrid Control on a Dialog having background image.

Thanks,
  Aniket

Nishad S10-May-06 21:51

10-May-06 21:51

What did you do? I think you used a picture static control, right?

- NS -

Andy Rama10-May-06 22:48

10-May-06 22:48

Hi,
   Yes, you are right. I use Picture Contol with 'Bitmap' Type & on that I place 'FlexGird' Control.
   What is the proper way to do it?
   I dont what to write in OnEraseBkgnd or OnPaint & how to use them.

Thanks,
  Aniket

Nishad S10-May-06 22:52

10-May-06 22:52

Try this
GetDlgItem(IDC_STATIC_BMP)->ModifyStyle( 0, WS_CLIPSIBLINGS );

- NS -

Nishad S10-May-06 23:01

10-May-06 23:01

Try this
GetDlgItem(IDC_STATIC_BMP)->ModifyStyle( 0, WS_CLIPSIBLINGS );

I forgot to say that it should be placed in OnInitDialog Smile | :)

- NS -

Andy Rama10-May-06 23:24

10-May-06 23:24

Hi,
    Thanks for 
       GetDlgItem(IDC_STATIC_BMP)->ModifyStyle( 0, WS_CLIPSIBLINGS );
    What this statement do?

   I add this line in 'OnInitDialog()', but there is no any progress.
   'FlexGrid' control is not visible. Actually it is behind that image. And I am trying to display 'FlexGrid' on that image.
   
Thanks,
 Aniket

Nishad S10-May-06 23:35