C / C++ / MFC

1-Mar-07 0:28

Dear All;

I have a dialog box hosting a picture control which has a bitmap loaded in it. The bitmap is scrollable (I derived a class from CScrollView to do that).

How do I capture the OnLButtonDown and OnLButtonUp mouse events that happen within the scrollable image (ie. those which happen within the picture control only) ?

Thank you

llp00na

Naveen1-Mar-07 0:37

1-Mar-07 0:37

Derive a class from CStatic and make a control variable for the picture object of tis class. Now you can handle the OnLButtonDown and OnLButtonUp inside this class.

Another way is to overide the PreTranslateMessage() of the main dialog. Inside it check the message is WM_LBUTTONDOWN or WM_LBUTTONUP and the hWnd is the handle of the picture control.

nave

llp00na1-Mar-07 1:12

1-Mar-07 1:12

Thank you for your answer.

I will try our your first suggestion, it sounds feasible.
Another inquiry if you dont mind, the picture control is scrollable (ie. if the loaded image is bigger than the size of the picture control, scroll bars are provided to allow the user to view all parts of the image) and i will need to retrieve the (x,y) of user clicks within the image.

do you think i will have problems getting the coordinates in this case considering the top left corner of the image control as the reference point?

llp00na

Naveen1-Mar-07 1:18

1-Mar-07 1:18

llp00na wrote:
do you think i will have problems

offcourse no. The point you recieve in the WM_LBUTTONDOWN will be a point relative to the top left postion of the image control itself

nave

llp00na1-Mar-07 1:33

1-Mar-07 1:33

But the control image is attached to a scrollable window -a class derived from CScrollView-

llp00na

llp00na1-Mar-07 1:39

opendesktop returning 170 error code (The requested resource is in use. ERROR_BUSY)

1-Mar-07 1:39

I think I have got it. I have added the mouse event handlers to the derived class from CScrollView Smile | :)

.

Thank you very much for your help.

llp00na

Dialog Problems in Vista

NiceNaidu1-Mar-07 0:15

NiceNaidu

1-Mar-07 0:15

Hi friends,

I have two dialogs .
dialog1 has the following styles
DS_MODALFRAME | WS_POPUP |WS_CAPTION |WS_BORDER

dialog2 has the following styles
DS_MODALFRAME | WS_POPUP.

Dialog 1 is placed exactly on the top of Dialog 2.
These two dialogs are aligned in a way that they appear as a single dialog.
Things are working fine in all the windows operating systems(except Vista)

But in Vista,
The alignment is lost.
The top dialog(dialog1) appears little bigger than the dialog2.
Can somebody help me out solving this problem.

Code is written using pure SDK.(no MFC).
Thanks in advance.

Appu..
"My blood group is not B+.But I have it my blood"

Yogish A J28-Feb-07 23:26

Yogish A J

28-Feb-07 23:26

Hi,

We are using opendesktop api in a binary and we ar getting return code
170 (The requested resource is in use. ERROR_BUSY)after executing the
binary for some times . If i restart the box and execute the binary,
the error disappears.

I have not been able to find any documentation describing under what
conditions ERROR_BUSY is returned by OpenDesktop nor how to handle
this condition. For example, should OpenDesktop be retried after a
short sleep?

If anyone can provide any information on this condition, it would be
appreciated.

Regards,
Yogish

Catching the Escape Key (MFC Dialogs)

waxie28-Feb-07 23:16

waxie

28-Feb-07 23:16

Hi guys,

I've been reading some forums about catching the escape key. I have this property page and when I press the escape key, instead of closing (which should have happened by default), does not close.
There were some suggestions like overriding OnClose and OnCancel or using PreTranslateMessage which has this code:

BOOL MFCDigPropPage::PreTranslateMessage(MSG* pMsg)
{
if(pMsg->message==WM_KEYDOWN)
{
if(pMsg->wParam==VK_RETURN || pMsg->wParam==VK_ESCAPE)
MessageBox("Pressed the escape or enter key!");
}
return CDialog::PreTranslateMessage(pMsg);
}

This code worked when I created a simple dialog box with just the OK and Cancel button on it. But when i tried it on my property page, it does not work anymore. Any suggestions/ideas regarding this one??? I would really really really appreciate any help on this.

Thanks! Smile | :)

waxie

Re: Catching the Escape Key (MFC Dialogs)

Naveen28-Feb-07 23:46

Re: Catching the Escape Key (MFC Dialogs)

28-Feb-07 23:46

you need to handle the PreTranslateMessage of the property sheet. if property sheets have a parent then handle the pretranslate of that dialog.

nave

prasad_som28-Feb-07 23:48

prasad_som

28-Feb-07 23:48

waxie wrote:
Any suggestions/ideas regarding this one???

You need to handle this ,message in owner property sheet. e.g.

BOOL CMySheet::PreTranslateMessage(MSG* pMsg)
{
 if(pMsg->message==WM_KEYDOWN)
    {
        if(pMsg->wParam==VK_RETURN || pMsg->wParam==VK_ESCAPE)
            MessageBox(L"Pressed the escape or enter key!");            
     }
return CPropertySheet::PreTranslateMessage(pMsg);
}

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: Catching the Escape Key (MFC Dialogs)

Michael Dunn1-Mar-07 5:59

Michael Dunn

1-Mar-07 5:59

What are you trying to do? If you want the dialog to not close when the user presses Enter/ESC, don't use PreTranslateMessage() which is too low-level. Just change OnOK()/OnCancel() so they don't call EndDialog(). In a property page, handle the PSN_APPLY and PSN_QUERYCANCEL notifications.

--Mike--
Visual C++ MVP Cool | :cool:

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Annotation on the Screen

Vissu8928-Feb-07 23:14

Vissu89

28-Feb-07 23:14

I am trying to develop a Annotation tool, with which i should be able to draw, mark on the windows screen.

Can any help me, in pointing to some documentation/APIs where i can get started.

Thanks in advance,
Vissu

Re: Annotation on the Screen

ThatsAlok28-Feb-07 23:21

ThatsAlok

28-Feb-07 23:21

Vissu89 wrote:

Can any help me, in pointing to some documentation/APIs where i can get started.

check CDC class in MSDN!

"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
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how to distribute last column of list control to fit into client area?

rakeshbbaldha28-Feb-07 22:52

rakeshbbaldha

28-Feb-07 22:52

hi ,

how to distribute last column of list control to fit into client area?

thanks
rakesh

Re: how to distribute last column of list control to fit into client area?

Naveen28-Feb-07 23:08

Re: how to distribute last column of list control to fit into client area?

28-Feb-07 23:08

Try the below code.

CRect ClientRect;<br />
      GetClientRect( &ClientRect );<br />
      CRect LastItemRect;<br />
      int nLastitem = GetHeaderCtrl()->GetItemCount() - 1;<br />
      GetHeaderCtrl()->GetItemRect( nLastitem , &LastItemRect );<br />
      int nNewLength = ClientRect.right - LastItemRect.left  ;<br />
      SetColumnWidth( nLastitem , nNewLength );

nave

rakeshbbaldha28-Feb-07 23:14

rakeshbbaldha

28-Feb-07 23:14

thank you,

can you please reproduce this probelm by using

1> press window key + e
2> go to details view of folder

now see last column here in list.
can we get last column by using getheaderctrl() fn,

now i have to re distribute this space into all column at runtime .

thanks
rakesh

Re: how to distribute last column of list control to fit into client area?

Naveen28-Feb-07 23:40

Re: how to distribute last column of list control to fit into client area?

28-Feb-07 23:40

if you want to equally distribute the column width do as follows..

CRect ClientRect;
GetClientRect( &ClientRect );
CRect LastItemRect;
int nCount = GetHeaderCtrl()->GetItemCount();
int nWidth = ClientRect.Width()/nCount;
for( int nIdx = 0;nIdx < ncount; nIdx++)
{
SetColumnWidth( nIdx , nWidth );
}

nave

rakeshbbaldha1-Mar-07 0:58

rakeshbbaldha

1-Mar-07 0:58

thank you very much

Re: how to distribute last column of list control to fit into client area?

Michael Dunn1-Mar-07 6:00

Michael Dunn

1-Mar-07 6:00

The list will do this for you. Call SetColumnWidth() on the last column and use the LVSCW_AUTOSIZE_USEHEADER flag.

--Mike--
Visual C++ MVP Cool | :cool:

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Derive Class from CTime

e-DJ28-Feb-07 21:46

e-DJ

28-Feb-07 21:46

Hi all,

I want to create a new class derived from CTime.

<br />
class XTime : public CTime  <br />
{<br />
public:<br />
	XTime();<br />
	virtual ~XTime();<br />
<br />
};<br />

then I create a new object

XTime m_Date;

and then I want to initialize my object:

m_Date = NULL;

there is an error when compiling. When I create my object from a normal CTime, everything works.
As far as I learned C++, I can derive a new class and it inherits everything from the base class. But why can't I initialize it? It seems, that the = operator is not working.

Any help?

Juergen

Re: Derive Class from CTime

Naveen28-Feb-07 22:32

Re: Derive Class from CTime

28-Feb-07 22:32

This is because CTime have a contrcvtor of type CTime(time_t time);

So in the derived class also declare a constructor which accepts a time_t object and simply pass that object to base class.

class XTime : public CTime <br />
{<br />
public:<br />
XTime();<br />
virtual ~XTime();<br />
<br />
XTime( time_t t ):CTime(t)<br />
{<br />
}<br />
<br />
<br />
};

nave

e-DJ28-Feb-07 23:34

e-DJ

28-Feb-07 23:34

Ahh, that helped a lot.

Now I have to find a way to inherit the = operator.

Thanks a lot

Juergen

Re: Derive Class from CTime

Naveen1-Mar-07 0:21