Re: Dialog Boxes - C / C++ / MFC Discussion Boards

Re: How do I get multi-node select in a Tree Control?

Tomasz Sowinski8-Mar-02 3:43

8-Mar-02 3:43

Oct'96 issue of MSJ, C++ QA column by Paul DiLascia contains the code you need. The article may be in the MSDN installed on your disk. If it's not there, go to msdn.microsoft.com and search for CMultiTreeCtrl.

Tomasz Sowinski -- http://www.shooltz.com

Dialog Boxes

Mark Ryall8-Mar-02 2:26

Mark Ryall

8-Mar-02 2:26

Hi.

I have programmed a Dialog box with a progress bar.

But I want the progress bar to run a soon as the dialog opens with no prompt from the user, how do i do this. InitDialog is too early if you get my drift.

I am using VC++ 6.0

Regards

Mark Big Grin | :-D

Re: Dialog Boxes

Tomasz Sowinski8-Mar-02 2:31

Tomasz Sowinski

8-Mar-02 2:31

How are you going to increment the progress bar value? Is it related to some background task?

Tomasz Sowinski -- http://www.shooltz.com

Re: Dialog Boxes

Joaquín M López Muñoz8-Mar-02 2:38

Joaquín M López Muñoz

8-Mar-02 2:38

It is surprising to me that you consider OnInitDialog too early to initiate your progress bar. This handler is on the very brink of the moment when the dialog is shown up!
Anyway you can handle WM_WINDOWPOSCHANGED, which is (if I'm not wrong) the very first message sent right after the dialog appears on the screen.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Dialog Boxes

Carlos Antollini8-Mar-02 2:50

Carlos Antollini

8-Mar-02 2:50

Put a timer in the Dialog box. Start it in the OnInitDialog....
In the OnTimer, Test if the Dialog is Visible and Ready....
Regards.

Carlos Antollini.
Sonork ID 100.10529 cantollini
There are two ways to write error-free programs; only the third one works.

Re: Dialog Boxes

Mark Ryall8-Mar-02 3:02

Mark Ryall

8-Mar-02 3:02

I'm still fairly new to VC++

So do I create a member for a timer, is it a CTimer??

What function(s) do I need in my cpp??

Mark Smile | :)

Re: Dialog Boxes

Carlos Antollini8-Mar-02 3:04

Carlos Antollini

8-Mar-02 3:04

Yes you need to Use the CWnd::SetTimer function and add the message CWnd::OnTimer

Regards...

Carlos Antollini.
Sonork ID 100.10529 cantollini
Beta. Software undergoes beta testing shortly before it's released. Beta is Latin for "still doesn't work."

Re: Dialog Boxes

Jon Newman8-Mar-02 7:27

Jon Newman

8-Mar-02 7:27

Carlos Antollini wrote:
Beta is Latin for "still doesn't work."

Its actually greek if I'm not mistaken. Nice joke anyway.

.NET or not .NET? MFC is the question......

Re: Dialog Boxes

Jonathan Craig8-Mar-02 4:53

Jonathan Craig

8-Mar-02 4:53

You should be able to access any control in a dialog box from the OnInitDialog method. All controls have been created at this point. UNLESS you have subclassed any of the controls (i.e. you created member variables for them with Class Wizard). They do not get connected until the first call to DoDataExchange. But this gets called by CDialog::OnInitDialog(). Use the code snippet below as a reference:

BOOL CCreateReportDlg::OnInitDialog() 
{
  //Can't access subclassed controls yet...
 
  CDialog::OnInitDialog();
  // TODO: Add extra initialization here
 
  //Now you can access subclassed controls...
}

Hope this helps. Smile | :)

Jonathan Craig
www.mcw-tech.com

Re: Dialog Boxes

Ravi Bhavnani8-Mar-02 6:41

Ravi Bhavnani

8-Mar-02 6:41

For modeless dialogs, subclassed controls get created after your overridden OnInitDialog() has finished executing.

When I want to initialize subclassed controls in a modeless dialog, I post a custom WM_COMMAND (like IDC_INIT_GUI) from OnInitDialog() and handle the initialization in the handler OnInitGui().

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Dialog Boxes

Jonathan Craig8-Mar-02 7:14

Jonathan Craig

8-Mar-02 7:14

If you are manually subclassing controls then it is completely up to the programer to determine when to subclass and init controls. But if they are done through the Class Wizard they can be accessed from the OnInitDialog method after the base class call CDialog::OnInitDialog for modal or modeless dialogs. Here is some currently working code that works as modal or modeless.

void CMyDlg::DoDataExchange(CDataExchange* pDX)
{
  CDialog::DoDataExchange(pDX);
  //{{AFX_DATA_MAP(CBusyStatusDlg)
  DDX_Control(pDX, IDC_PROG_BAR, m_progBar);
  //}}AFX_DATA_MAP
}
 
BOOL CMyDlg::OnInitDialog() 
{
  CDialog::OnInitDialog();
 	
  m_progBar.ShowWindow(SW_HIDE); //Hide for start.
 
  // TODO: Add extra initialization here
  CenterWindow();
 	
  return TRUE;  // return TRUE unless you set the focus to a control
                // EXCEPTION: OCX Property Pages should return FALSE
}

This code works fine if you are displaying your dialogs the normal way.

CMyDlg dlg;
dlg.DoModal();

CMyDlg *pdlg = new CMyDlg;
pDlg->Create(IDD, pParent);

No need to do any custom messages if they are not needed.

Of course, from the original message it hard to know what the author means by “I want the progress bar to run a soon as the dialog opens.” Writing code to updated a progress bar is a whole other discussion. Smile | :)

Jonathan Craig
www.mcw-tech.com

Re: Dialog Boxes

Gaurika Wijeratne8-Mar-02 6:29

Gaurika Wijeratne

8-Mar-02 6:29

Hi Mark

Try to use WM_SHOWWINDOW , Add a Message Handler to WM_SHOWWINDOW It will Create the Member Function OnShowWindow(BOOL bShow, UINT nStatus)

Start the Progress bar in here..

Smile | :)

Gaurika Wijeratne
www.gaurika.com // gaurika@sltnet.lk

How do I monitor per process CPU usage on Windows 9x?

8-Mar-02 2:24

I want to monitor per process CPU usage on Windows 9x. Now most answers point to writing a device driver (VXD). But what I really want to know is what code has to be written to monitor the per process CPU usage on Windows 9x only.

Wilfred

Re: How do I monitor per process CPU usage on Windows 9x?

Tomasz Sowinski8-Mar-02 2:29

Tomasz Sowinski

8-Mar-02 2:29

You don't need vxd to access the performance data under 9x. Check the KB article Q174631 HOWTO: Access the Performance Registry Under Windows 95.

Tomasz Sowinski -- http://www.shooltz.com

Re: How do I monitor per process CPU usage on Windows 9x?

8-Mar-02 23:44

Sir,
I have noticed that the resitry entries in win95/95 systems only provide the total CPUUsage and not CPUUSAGE PER PROCESS.In WinNT it is done through NtQuery Information function in Kernel.dll. I am not able to find any path to do it in Win95/98 systems.

I require dynamically for some interval of time(say for every 1 minute), the CPU used by every process currently running in the system.

Could you please help as it is very urgent.

Regards
Shankar

Wilfred

Using MFC CStringList as a COM collection with ATL?

Gavin Jerman8-Mar-02 1:03

Gavin Jerman

8-Mar-02 1:03

We have a lot of VC6 legacy code using MFC's CStringList. I've been charged with creating a COM interface for CStringList so that it can be used from within VB. Also the interface needs to support the for each ... VB syntax.

It seems to me that ATL's CComEnum/IEnumVARIANT is the answer, but I can't figure out the implementation. I accept that I should probably be using the STL, but that's not an option at the moment. I've seen a lot of examples of using CComEnum but they all seem to use STL containers or safearrays to hold the data. Does anyone have an example that uses CStringList or any other MFC list/array?

Gavin

Linked list destruction problem

Andrew Hoole8-Mar-02 1:04

Andrew Hoole

8-Mar-02 1:04

Hi
I have some code that contains a linked list of pointers to a class that itself contains a list of items. These are declared as follows:

class CROI : public CObject
{
DECLARE_DYNCREATE(CROI)

.
.
.
CTypedPtrList<cptrlist, coutline*=""> m_lpOutlines;
CTypedPtrList<cptrlist, cvertexlist*=""> m_lpVertexLists;
.
.
.
};

class CVertexList
{
public:
CVertexList();
virtual ~CVertexList();

CList<cpoint, cpoint&=""> m_lVertices;

};

When I need to recreate this list I try and clear the existing list as
follows:

while(!m_lpVertexLists.IsEmpty()){
pVertexList = m_lpVertexLists.RemoveHead();
delete pVertexList;
}

Now this crashes sometime either because the pVertexList that it gets is not pointing to valid memory or because the list of objects at the next level down is corrupted at some point (ie a pNext is incorrect).

So some how something is corruptting the memory that is used for these lists and I can't figure it out.

Does anyone know how I can debug it to find out what is fiddling with the memory.

I am using VC++ 6.0 purchased back in 1998 and haven't downloaded any updates that I can remember. Is anyone aware whether they might have been problems with this particular area of VC++.

Any help would be much appreciated.

Puzzled

Confused | :confused:

Andrew

Re: Linked list destruction problem

Tomasz Sowinski8-Mar-02 1:15

Tomasz Sowinski

8-Mar-02 1:15

I don't believe your problem will disappear when you install latest service pack (SP5).

It seems that you're corrupting the heap somewhere. I'd try to reduce the problem - create the sample MFC app with wizard, copy CROI and CVertexList, instantiate one CROI and fill it with multiple lists of vertices. If program will crash, you'll be sure that CROI the source of problems.

To automate this kind of debugging you may consider a special tool, like BoundsChecker or Rational Purify. I'm not sure if you can download demo version of BoundsChecker today; evaluation version of Purify can be downloaded from www.rational.com

Tomasz Sowinski -- http://www.shooltz.com

CTreeCtrl: editing items question

8-Mar-02 0:55

Hi,

I have editing of sub items enabled in a tree control. Is there any way that I can restrict the users input to numbers as you can with a normal CEdit control?

Thanks

Matthew

also, if anyone knows this it would be great. If I activate the IME during editing an item, the input isn't displayed very well at all as the bounding box for the text when editing begins isn't sufficient. Is there are fix for this?

cheers

Matthew

Re: CTreeCtrl: editing items question

Tomasz Sowinski8-Mar-02 1:07

Tomasz Sowinski

8-Mar-02 1:07

You'll probably have to subclass the tree edit control and catch the keystrokes.

Easier, slightly different way is to handle TVN_ENDLABELEDIT notification. In the handler, you can verify the text typed into edit control. If verification fails, you'd display msgbox with appropriate text, then call CTreeCtrl::EditLabel.

Tomasz Sowinski -- http://www.shooltz.com

Re: CTreeCtrl: editing items question

8-Mar-02 1:52

Top idea. Will do. Cheers. Matthew

Layered Controls

Derek Lakin8-Mar-02 0:33

Derek Lakin

8-Mar-02 0:33

I need to get a certain look and feel that involves placing controls on top of each other. IN particular, atm, I'm using a CStatic-derived class to change the background colour to the window colour (usually white), and then it has a client edge on it to make it look like a standard edit box.

On top of these I then need a combination of static controls, bitmaps, buttons, edit boxes and radio buttons.
(The look I'm going for is like the IE search window, but without using HTML).

My problem is that when controls are placed above another control they then don't receive focus, so I can't enter text or click on buttons.

So, what can I do to 'deactivate' the bottom control? I've tried setting it to the bottom of the Z-order and everything else above it, but no joy Frown | :(

Is the answer to just paint it on to the dialog using Draw3DRect and FillSolidRect? In which case should it be in the OnPaint handler and will the controls above it get drawn properly?

Derek Lakin.

I wish I was what I thought I was when I wished I was what I am.

Salamander Software Ltd.

Re: Layered Controls

Tomasz Sowinski8-Mar-02 0:43

Tomasz Sowinski

8-Mar-02 0:43

Where are you going to place the 'layered' controls? In the dialog or CView-derived class?

Tomasz Sowinski -- http://www.shooltz.com

Re: Layered Controls

Derek Lakin8-Mar-02 2:40

Derek Lakin

8-Mar-02 2:40

They're in a dialog-derived class, on a CFormView-derived class.

Basically, I want to reproduce the IE search window on a tab page in a tab control which is displayed on a CFormView-derived class, but I don't want to use an html window.

Derek Lakin.

I wish I was what I thought I was when I wished I was what I am.

Salamander Software Ltd.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.