C / C++ / MFC

28-Jun-06 20:04

Im not sure i think i see in http://www.codeguru.comsee(CComboBox)

whitesky

hi all [modified]

ashish dogra28-Jun-06 19:33

28-Jun-06 19:33

plz tell me

dlg.Create(IDD_DIALOG1);
dlg.ShowWindow(1);
when i rty this to create modeless dialog box after one try it will create error as assertion failureplz
Ashish Dogra
MCA
Noida

-- modified at 1:33 Thursday 29th June, 2006

Hamid_RT28-Jun-06 19:36

28-Jun-06 19:36

yes because you create your dialog and you dont need to create again

whitesky

ashish dogra28-Jun-06 19:41

28-Jun-06 19:41

sir i will try to create it again after cancelling it
but sir as with domaodal() we can try again after cancelling it it will not give any error

Ashish Dogra
MCA
Noida

Sarath C28-Jun-06 19:43

Sarath C

28-Jun-06 19:43

For a modeless dailog, you should define your own constructore,
never let the default constructor to call the base class with template ID.

Here is an article from MSDN[^]

SaRath.

"It is your attitude, not your aptitude, that determines your altitude - Zig Ziglar."
My Blog | Understanding State Pattern in C++

ashish dogra28-Jun-06 20:00

28-Jun-06 20:00

even i use this i will still not solve the problem
CMy dlg;
dlg.Create(IDD_DIALOG1);
dlg.ShowWindow(1);
please tell me some example

Ashish Dogra
MCA
Noida

Hamid_RT28-Jun-06 20:05

28-Jun-06 20:05

ashish dogra wrote:
CMy dlg;
dlg.Create(IDD_DIALOG1);
dlg.ShowWindow(1);

Whats problem with this code

whitesky

ashish dogra28-Jun-06 20:45

28-Jun-06 20:45

sir
the problem is that when i run application the modeless dialog box open a screen after clicking on ok button of fiest dialog box
but when i cancel the modeless dialog and again click on ok button of first dialog box then it will give an assertion error and does not create modeless dialog box again
plz sovle this one

Ashish Dogra
MCA
Noida

Hamid_RT28-Jun-06 20:46

28-Jun-06 20:46

Can you show how to use and you show your code that has error

whitesky

ashish dogra28-Jun-06 21:05

28-Jun-06 21:05

void CGd1Dlg::OnOK()
{
CMy dlg;
dlg.Create(IDD_DIALOG1);
dlg.ShowWindow(1);
}

Ashish Dogra
MCA
Noida

Hamid_RT28-Jun-06 21:32

28-Jun-06 21:32

can you show in

CMy::CtetDlg(CWnd* pParent /*=NULL*/)<br />
: CDialog(CtetDlg::IDD, pParent)

and one suggestion use this function instead your functions and answer to me it work or doesnt work

CMy::CtetDlg(CWnd* pParent /*=NULL*/)<br />
: CDialog(CtetDlg::IDD, pParent)<br />
BOOL o=	Create(IDD,pParent);

-----------

<br />
void CGd1Dlg::OnOK() <br />
{<br />
CMy *dlg;<br />
dlg=new CMy(this);<br />
/*use from breakpoint and debug for see error if you get a error*/<br />
dlg->ShowWindow(1);<br />
}<br />

whitesky

ashish dogra28-Jun-06 21:45

28-Jun-06 21:45

thanks sir it works
thanks a lot ......................HAVE A NICE DAY

Ashish Dogra
MCA
Noida

Re: hi all [modified]

ovidiucucu28-Jun-06 20:31

ovidiucucu

28-Jun-06 20:31

After exiting DoModal, the attached window of CDialog object is destroyed and detached, so there is no problem to call DoModal again.
For a modeless dialog (made with CDialog::Create), unless the CDialog object goes out-of scope or DestroyWindow was called, the window is not destroyed, not even the user pushes OK/Cancel/close button.
So you have to test if the dialog was created before call CDialog::Create.
If yes, then simply show it:

void CFoo::ShowModelessDialog(CDialog& dlg, UINT nResID)
{
   if(!::IsWindow(dlg.m_hWnd)) // thest attached window handle
   {
       // create only if not yet created
      dlg.Create(nResID, this);
   }
   dlg.ShowWindow(SW_SHOW);
}
// ...
// ... somewhere ...
   ShowDialog(m_dlg, IDD_DIALOG1);
// ... and no problem to show again
   ShowDialog(m_dlg, IDD_DIALOG1);

NOTE: You can test m_hWnd against NULL instead of calling ::IsWindow, as well.

Ovidiu Cucu
Microsoft MVP - Visual C++

Nawal K Gupta28-Jun-06 21:03

Nawal K Gupta

28-Jun-06 21:03

In you use this code
void OnSomeFunction()
{
CMy dlg;
dlg.Create(IDD_DIALOG1);
dlg.ShowWindow(1);
}
this is not safe, because the dlg object is created in Stack and it will get destroyed
as soon as the function is out of scope.

Create ModeLess Dialogs in Heap or Make Sure that the Object is not out of scope by making is
static or Global/Top Clsss Variale Like.
One Way of Doing It is:
void OnSomeFunction()
{
static CMy * Dlg =NULL;
if (!m_Dlg)
{
Dlg= new CMy();
Dlg->Create(IDD_DIALOG1);

}

dlg.ShowWindow(1);
}

Problem with wizard type application

ovidiucucu28-Jun-06 22:21

ovidiucucu

28-Jun-06 22:21

Hey, hey, dear Indian Idol!
To be clear.
I didn't suggest to declare a CDialog object locally in a function. Did you see that in may example?
If you pay a little bit more attention, can observe that I prefixed with m_ which suggest that m_dlg is a member of class CFoo.
And your static CMy *Dlg locally declared in OnSomeFunction() smells a C.
And by the way... where you think it's possible to delete *Dlg in order to get rid of memory leaks?

Ovidiu Cucu
Microsoft MVP - Visual C++

regarding CFile

happy_ram28-Jun-06 19:29

happy_ram

28-Jun-06 19:29

i want to clear the dats which is present in file.
how should i can do this.
because if i use Remove() method file is deleted.
so want to clear the data not to delete the file.
sree.

Re: regarding CFile

Naveen28-Jun-06 19:33

Naveen

28-Jun-06 19:33

use CFile::SetLength()

SetLength( 0 ); // Will clear all the datas

nave

Re: regarding CFile

David Crow29-Jun-06 3:19

David Crow

29-Jun-06 3:19

Just open the file with CFile::modeCreate flag.

"The largest fire starts but with the smallest spark." - David Crow

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

rajeevktripathi28-Jun-06 19:10

rajeevktripathi

28-Jun-06 19:10

HI All
Working on a wizard type dilaog application and taken the idea of creating wizard from the below link

http://www.codeproject.com/dialog/wizard2000.asp

Here having one problem:
what I am doing is that Suppose right now on property page number 3 and performing some operaion, after finishing operation want to jump on the next page (number 4) automatically, without clicking on the Next Button.
For this using SetActivePage(int i) function. but this function throws exception.

One more thing that when I jump from Page 3 to Page 2 it jumps successfully, problem is with the pages ahead.

So Please tell me that how to jump over the next page in the wizard automatically

Please help.
Thanks

Re: Problem with wizard type application

Blake Miller29-Jun-06 4:56

Blake Miller

29-Jun-06 4:56

You get exception because dialog for the 'next' page has not been created yet.
I usually send a 'faked' next button press to the parent of wizard pages and it 'thinks' the user has pressed next button. That seems to always work out well.

I've seen better runs in my shorts! - Patches O'Houlihan

Printing [modified]

RockyJames28-Jun-06 18:38

RockyJames

28-Jun-06 18:38

Hi,I have taken FormView,in which i have created ListControl,The client area, "rect" of the FormView is taken is taken as i/p for ListControl Creation.I have handled WM_CONTEXTMENU in the formview,in the ContextMenu,there are two items one is "Print" another is "PntView"..ON_COMMAND of both ID_PRINT and ID_PRIVIEW i have handled in formview.in the respective functions i have called CFormView::OnFilePrint,CFormView::OnFilePrintPriview,i have overriden "Onprepareprinting" and "OnPrint".When i click print in the context menu , it is printing,when i click priview in the context preview is coming,but in the preview when i print button,it is not printing , what could be the reason...

Thanks in before

James

-- modified at 0:40 Thursday 29th June, 2006

Re: Printing

Hamid_RT28-Jun-06 19:29