C / C++ / MFC Discussion Boards

Re: C code

Hamid_RT14-Jan-09 3:39

Hamid_RT

14-Jan-09 3:39

Hey how do you know its a secret? it seems you knew this secret!
Big Grin | :-D

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Re: C code

CPallini14-Jan-09 8:46

CPallini

14-Jan-09 8:46

Do you know the secret too? Are you a 'Senior Developer' too?
Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: C code

Hamid_RT14-Jan-09 18:44

Hamid_RT

14-Jan-09 18:44

Oh no you revealed my secrect who knows this secrect except you and 5,804,125 members ?
Big Grin | :-D

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Re: C code

CPallini14-Jan-09 21:31

CPallini

14-Jan-09 21:31

Uhmmm, CIA, FBI,....
Big Grin | :-D

BTW: Good Hijacking activity, here! Smile | :)

Re: C code

Hamid_RT15-Jan-09 1:34

Hamid_RT

15-Jan-09 1:34

You can refresh my name on the group.
Laugh | :laugh:

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Re: C code

CPallini15-Jan-09 2:10

CPallini

15-Jan-09 2:10

Done [^].

Re: C code

CPallini13-Jan-09 7:37

CPallini

13-Jan-09 7:37

MZonaid wrote:
How program identify negative number from input while I entering negative number?

Possibly looking up the negative sign you enter before the first digit...

BTW: you really need a good C tutorial.
Smile | :)

Application Block

GudduRanchi13-Jan-09 5:41

GudduRanchi

13-Jan-09 5:41

one method i know about application block by pooling process table and if it matches then terminateprocess() . but is their any method to close the application before getting launch. if it is their how to get this.

Re: Application Block

Hamid_RT13-Jan-09 6:49

Hamid_RT

13-Jan-09 6:49

Im not sure Im undrestood your question or no but do you need to WM_CLOSE?

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

Desktop Window Class name [modified]

Sauce!13-Jan-09 3:03

Sauce!

13-Jan-09 3:03

I need to know what the Desktop Window Class Name is. I am using an application called Winspector (similar to spy++, which I don't have) to find the handle to the desktop. Winspector requires a class name in order to do a search. I've searched around MSDN and found this article[^] which states that

The window class name for the desktop window is "#32769".

I punched this into Winspector but it's search came up with nothing. Same goes for "32769". Even typing in "#" on it's own didn't prompt the auto-complete feature. Is this information incorrect, or out of date? What is the correct windows class name?

I'm using windows vista home premium 64bit.

modified on Tuesday, January 13, 2009 9:12 AM

Re: Desktop Window Class name

«_Superman_»13-Jan-09 3:47

«_Superman_»

13-Jan-09 3:47

I'm using Windows Vista Enterprise 64 bit.
Spy shows the desktop class as #32769 (Desktop)
Try giving the complete name including the text within brackets and the space before that.

«_Superman_»

Re: Desktop Window Class name

David Crow13-Jan-09 3:49

David Crow

13-Jan-09 3:49

Sauce! wrote:
I am using an application called Winspector (similar to spy++, which I don't have) to find the handle to the desktop.

What about GetDesktopWindow()?

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: Desktop Window Class name

Sauce!13-Jan-09 4:11

Sauce!

13-Jan-09 4:11

No luck with superman's suggestion.

David I'm not sure what you're getting at. Are you suggesting I make my own application to find out this information? I don't think that will work anyway. I was under the impression that that function returned the desktop window, but not the desktop window I'm looking for :P I want to find the window that the wallpaper is rendered to. Currently I can get the handle to the SysListView32 which covers the same client area as the background, however this window sits on top of the desktop wallpaper, as well as the desktop icons.

I think a bit of background info is necessary. I'm following along with this[^] I am attempting to run a screensaver on my desktop with the render target set to the window handle for the desktop in order to emulate a Vista ultimate-only feature. This can be done easily enough, however you cannot access the icons on your desktop when you do this. I know it's got to be possible to render to the window behind the icons, where the wallpaper is rendered, I just don't know HOW.

Surely someone around here can work out a way?

Re: Desktop Window Class name

David Crow13-Jan-09 4:29

David Crow

13-Jan-09 4:29

Sauce! wrote:
David I'm not sure what you're getting at.

I was simply suggesting GetDesktopWindow() as a way to get a handle to the desktop window.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: Desktop Window Class name

Sauce!13-Jan-09 22:59

Sauce!

13-Jan-09 22:59

That's what I thought. It's easily doable, but the problem is it gets me nowhere, as that's not the desktop window I'm looking for Frown | :(

Surely someone knows what window the OS draws the actual WALLPAPER to?

Re: Desktop Window Class name

David Crow14-Jan-09 3:17

David Crow

14-Jan-09 3:17

Have you used Spy++ to see the parent/child relationship of the windows in question? It may be different in Vista, but in XP the desktop is the topmost window, and the icons are actually 4 "generations" removed from that.

Desktop
  Program Manager
    SHELLDLL_DefView
      SysListView32
        icons

I know this does not answer your question, but it may open a door you had previously not considered.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: Desktop Window Class name

Sauce!14-Jan-09 4:12

Sauce!

14-Jan-09 4:12

Thanks for the response.

I was just looking around in Spy++ tonight (after finally having found a legit download link) and came across the parent/child windows. Funny you should mention it right after I find it.

Setting the render target to the handle for SHELLDLL_DefView seems to do the trick, as the icons show through, however they flicker between frame updates on the screensaver. For example I can see the screensaver and no icons behind it, until I move my cursor over one of the icons (where it should be). The icon then flickers, and disappears until I move the mouse over it again.

Surely there's a way around this! :P

Re: Desktop Window Class name

Emilio Garavaglia14-Jan-09 22:45

Emilio Garavaglia

14-Jan-09 22:45

Actually the wallpaper is not displayed by the desktop, but by a desktop child that is the list control (syslistview) that shows the icons.
Another child is - for example - the taskbar...

Re: Desktop Window Class name

Sauce!14-Jan-09 23:18

Sauce!

14-Jan-09 23:18

well that's what I thought, but why then, does it render on top of the icons? Frown | :(

I would have thought that the icons and the wallpaper were rendered to seperate controls. Is there any way to keep the icons rendering on top of the wallpaper?

Re: Desktop Window Class name

Emilio Garavaglia14-Jan-09 23:26

Emilio Garavaglia

14-Jan-09 23:26

Sauce! wrote:
does it render on top of the icons?

er... not in that sense...
A list control displays icons, text and can have a background.
The order the rendering depends on the WM_PAINT implementation of the control's window procedure (that's a Win32 common control).
The fact they flicker or not depends also on that.

2 bugs found.
> recompile ...
65534 bugs found.
D'Oh! | :doh:

Showing a CDialog from within a CButton class

johanlich13-Jan-09 2:02

johanlich

13-Jan-09 2:02

Hi
I have been trying to create my own CButton class. The Button is its own project and is compiled in to the main project as a dependency (win32 project, Static Library, Common header file for: MFC).

Everything worked fine (it reacted when it got pressed and I could start and stop timers). But then I tried to show a dialog from inside the class something went wrong.

The code below shows what I'm trying to do. When I double-click on the button a simple dialog should pop-up. But that does not happen, dlg.DoModal() just returns -1.

// h-files
class CmyButton : public CButton
{
	DECLARE_DYNAMIC(CmyButton)
...

class CmyDialog : public CDialog
{
	DECLARE_DYNAMIC(CmyDialog)

...
// cpp-file
void CmyButton::OnLButtonDblClk(UINT nFlags, CPoint point)
{
	CmyDialog dlg;
	dlg.DoModal();

	CButton::OnLButtonDblClk(nFlags, point);
}

The project compiles without warnings and everything seems to be found, but the dialog just wont pop-up. But I can show a message-window using AfxMessageBox(_T()).

// Johan

Re: Showing a CDialog from within a CButton class

Naveen13-Jan-09 2:28

Naveen

13-Jan-09 2:28

johanlich wrote:
CmyDialog dlg; dlg.DoModal();

If you copy the above code and paste it in the InitInstance of the app, does it shows the dialog correctly?

nave

[OpenedFileFinder] [My Blog]

Re: Showing a CDialog from within a CButton class

David Crow13-Jan-09 2:46

David Crow

13-Jan-09 2:46

Did you use ClassWizard, or equivalent, to create CmyDialog?

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: Showing a CDialog from within a CButton class

johanlich13-Jan-09 3:09

johanlich

13-Jan-09 3:09

I used the ClassWizard to create CmyDialog, and the “Add Resource” tool to create the dialog-window (using MS Visual Studio 2005).

When I copy “CmyDialog dlg; dlg.DoModal()” to InitInstance the main window locks up as if there were a modal window, but the window does not show up on the screen (had to add some #includes into my main apps cpp-file since the CmyButton class is in another catalogue).

Thanks for the quick replies.

// Johan

Re: Showing a CDialog from within a CButton class

Iain Clarke, Warrior Programmer13-Jan-09 5:09

Iain Clarke, Warrior Programmer

13-Jan-09 5:09

In that case the button-thing is irrelevant. It's a problem with your dialog box.

Is the visible style set?

Can you put a breakpoint in the OnInitDialog and see it fire?

You can also set a no-fail-create flag, which is very useful. If there is a problem with a control on the dialog, the whole dialog creation would fail. (Mind you, DoModal should just return almost immediately...)

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

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