C / C++ / MFC Discussion Boards

MemLeak17-Mar-03 10:26

17-Mar-03 10:26

I have a project that use ODBC. I want to use a CListCtrl to represent my database data. When you create an ODBC project, you have an ***view class derived from CRecordView with a dialog attached to it. That's where I want to have my CListCtrl.

So I have putted my CListCtrl in the dialog with the res manager. I added a variable named m_wndListCtrl that is bound to my control in DoDataExchange(). I use the style VS_REPORT.

DDX_Control(pDX, IDC_LISTCTRL_VIEWDATA, m_wndListCtrl);

and I added 3 columns inside my control. in the function
OnInitialUpdate().

CRect rect;
m_wndListCtrl.GetClientRect(&rect);
int nColInterval = rect.Width()/5;

m_wndListCtrl.InsertColumn(0, _T("Item Name"), LVCFMT_LEFT, nColInterval*3);
m_wndListCtrl.InsertColumn(1, _T("Value"), LVCFMT_LEFT, nColInterval);
m_wndListCtrl.InsertColumn(2, _T("Time"), LVCFMT_LEFT, rect.Width()-4*nColInterval);

The problem is that I dont see any column.

Thanks for helping Smile | :)

Everything's beautiful if you look at it long enough...

Re: Columns in CListCtrl

valikac17-Mar-03 11:35

valikac

17-Mar-03 11:35

Weird. Try Invalidate().

Kuphryn

Re: Columns in CListCtrl

Abin17-Mar-03 14:32

Abin

17-Mar-03 14:32

Debug and check the value of nColInterval, see if it's desired.

Re: Columns in CListCtrl

Woody Green17-Mar-03 23:11

Woody Green

17-Mar-03 23:11

Your columns probably get created with a size 0. So as suggested debug your code and watch the nColInterval variable.

Or try creating the listctrl with hard coded values for the nColInterval:

<br />
m_wndListCtrl.InsertColumn(0, _T("Item Name"), LVCFMT_LEFT, 100);<br />
m_wndListCtrl.InsertColumn(1, _T("Value"), LVCFMT_LEFT, 100);<br />
m_wndListCtrl.InsertColumn(2, _T("Time"), LVCFMT_LEFT, 100);<br />

If this works you know its the size parameter

Good luck

Using ConnectNamedPipe in a service (OVERLAPPED)

Paul Farry17-Mar-03 10:22

Paul Farry

17-Mar-03 10:22

I'm building a service that uses named pipes, and I want the connectnamedpipe to return immediately a connection occurs, or to timeout after a period of time.

Is it best to
A) set the timeout period vey small, and be continuosly looping/waiting for a client to connect. THis was if I signal the service to stop, at the end of the loop, I can just bail out.

B) set the timeout period to quite high, and from the main thread, if I want the service to stop, I signal the event that the Connectnamedpipe is waiting on. And then bail, BUT the signal looks just like a client has connected.

I've looked at the PJNaughter articles, but none of these deal with Overlapped operation.

Are there any other options that I may be missing??

Re: Using ConnectNamedPipe in a service (OVERLAPPED)

Paul Farry17-Mar-03 11:30

Paul Farry

17-Mar-03 11:30

Doesn't matter, found this excellent article

http://www.codeproject.com/win32/overlappedio.asp

Adding HTML Help to an existing app

trimtrom17-Mar-03 10:06

trimtrom

17-Mar-03 10:06

Hello,
I am using VC++ .Net Standard on Windows XP Professional, and I have just
written an application for which I now want to create HTML Help. To
shortcut the procedure I have generated another new application with the
application wizard, including the help files. I now want to cut these files
out from the wizard application, and put them into my original app, where I
can develop them.

I have noted that in the .Net IDE, in the Solution Explorer, there are
supposed to be two sections in the tree for HTML Help: one for the project,
contents and index files, and then one for all the help topic .htm files.

But I can't seem to add the help project to my current app so that all the
files are correctly analysed. If I do Project -> Add Existing Item, the
files are not put under the HTML Help section. Come to that, I can't seem
to create the HTML Help section in the Solution Explorer.

I would be very grateful for hints on how to add a complete help project to
an existing app, so that it appears correctly, and runs as it should.

Thanks,
Trimtrom

Question about MFC Message Map

farzadb17-Mar-03 9:57

farzadb

17-Mar-03 9:57

Hi,
I'm kind of new to MFC so I really hope this isn't a stupid question. Anyway I have some code which basically declares a member function for message mapping as:

afx_msg void DoSomething (BOOL bVar = TRUE);

With the corresponding in the cpp file:

ON_BN_CLICKED(IDC_DOSOMETHING, DoSomething)

Now this compiles fine with VC6 but with VS.Net I get a compile error about not being able to do a static_cast and I was wondering if some behaviour about mapping to functions with arguments has changed in MFC 7. The ON_COMMAND macro gives the same error. So I've changed the code and I think it's better now but I wonder if I was just doing it wrong (bad style) all along or if this change caught many people off gaurd.

Thanks.

Re: Question about MFC Message Map

Dave Bryant17-Mar-03 10:01

Dave Bryant

17-Mar-03 10:01

You should not have a parameter in the command handler. All command handlers must take the form afx_msg void OnSomeCmd(); VC.NET has better compile-time checking of these macros, so that's why it reports the error.

Dave

Re: Question about MFC Message Map

farzadb17-Mar-03 10:59

farzadb

17-Mar-03 10:59

Dave Bryant wrote:
You should not have a parameter in the command handler. All command handlers must take the form afx_msg void OnSomeCmd(); VC.NET has better compile-time checking of these macros, so that's why it reports the error.

Dave

Thanks Dave. That's what I suspected but I just wanted to make sure I was doing it wrong all along. Smile | :)

Overlapped windows

Gleb17-Mar-03 9:37

Gleb

17-Mar-03 9:37

Hello.
Does anyone know how can i retrieve window area that closed by other window.

Ex:First window is a calculator and second window is "Registry Editor" ,and "Registry Editor" is partialy on top of the calculator.
I need to retrieve the area of the calculator that is currently under the "Registry Editor".
The area that the user is not seeing because the "Registry Editor" is on top of it.
Thank you.

Re: Overlapped windows

Ravi Bhavnani17-Mar-03 11:06

Ravi Bhavnani

17-Mar-03 11:06

I think you can use GetWindowRgn() to get the region that corresponds to the window's visible portion.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Toolbar question?

User 988517-Mar-03 9:34

User 9885

17-Mar-03 9:34

Have you guys seen the toolbar that poups up when you move the mouse over an image on IE? Is there any code that I can get to make one like that in my application? ie, a floating toolbar that can be repositioned?

My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers

modified 29-Aug-18 21:01pm.

OnCommand() override

ns17-Mar-03 9:32

17-Mar-03 9:32

I wrote my own handler for OnCommand in my CDialog class. In it I I did this:

if (LOWORD(wParam)==IDOK && lPAram==0)

{
  CWnd* p = GetFocus();

  if( *p == m_combo)
  {
    stuff
  } 

return OnCommand etc
}

When I hit enter after entering some text in the editpart of the combobox, and try to debug, the code never goes into the if (*p block....

How do I fix this? What am I doing wrong?

Appreciate your help,
ns

Re: OnCommand() override

Michael Dunn17-Mar-03 10:48

Michael Dunn

17-Mar-03 10:48

You need to compare HWNDs, not CWnd objects.

if ( p->GetSafeHwnd() == m_combo.GetSafeHwnd() )

--Mike--
THERE IS NO THERE IS NO BUT THERE IS MAGIC PIXIE DUST BUSINESS GENIE CODE PROJECT

Homepage | RightClick-Encrypt | 1ClickPicGrabber
"Which comes first, the bug or the stress?" -- Chris Maunder

many thanks!

ns17-Mar-03 10:49

17-Mar-03 10:49

Thank you!

Appreciate your help,
ns

Re: OnCommand() override

ns18-Mar-03 2:17

18-Mar-03 2:17

Well,
I did compare the safeHWnds like you said, but it still never says they are equal and never goes into the if. What I want to do is do something after I hit enter in a combobox edit part. SO I was overriding OnCommand:

OnCommand(..)
{
  if(LOWORD(wParam==IDOK &&lParam ==0)
  {
    CWnd* p = GetFocus();

    if ( p->GetSafeHwnd() == m_combo.GetSafeHwnd() )
    {......
      <code> never goes in  here when I hit Enter in combo</code>
    }
  }
}

Appreciate your help,
ns

SetFocus() problem

ns17-Mar-03 9:28

17-Mar-03 9:28

On My CDialog I have a CListCtrl and a combobox. When I click on an item in the listCtrl, in the OnItemChanged handler I put in m_combo.SetFocus().

Now while I am holding the selection down in the listCtrl, the focus cursor blinbks in the editbox part of the combobx. As soon as I let the mouse go, the focus shifts back to the listCtrl where the selection I just made gets highlighted. How do I keep the focus on the combo?

Appreciate your help,
ns

Re: SetFocus() problem

Ravi Bhavnani17-Mar-03 11:09

Ravi Bhavnani

17-Mar-03 11:09

Try replacing the m_combo.SetFocus() in the OnItemChanged() handler with PostMessage (WM_COMMAND, CMD_SET_FOCUS_TO_COMBO). Then write a handler for the hidden CMD_SET_FOCUS_TO_COMBO command which simply does m_combo.SetFocus().

This should allow the OnItemChanged() to complete normally and then cause focus to be set to the combo box.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

aha!

ns17-Mar-03 11:13

17-Mar-03 11:13

Shall check it out!

Re: aha!

Ravi Bhavnani17-Mar-03 11:38

Ravi Bhavnani

17-Mar-03 11:38

Damn, it feels good to be hacking again. Smile | :)

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

darn!

ns19-Mar-03 1:52

19-Mar-03 1:52

I tried your slick trick, but couldnt convince the focus to stay put. It momentarily flickers in the editpart of the combo but then returns to the listctrl and highlights the item I selected....

Appreciate your help,
ns

Re: darn!

Ravi Bhavnani19-Mar-03 2:26

Ravi Bhavnani

19-Mar-03 2:26

Try calling GotoDlgCtrl (GetDlgItem (IDC_MyCombo)).

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: darn!

ns19-Mar-03 2:45

19-Mar-03 2:45

stubborn thing - still no luck! Thanks for trying though.....

Appreciate your help,
ns

tree ctrl vertical scroll bar

Dave Bryant17-Mar-03 9:01

Dave Bryant

17-Mar-03 9:01

Does anyone know if it is possible to place the vertical scrollbar within the tree control on the left-hand side of the window, rather than the right (while still displaying left-to-right text)?

Dave

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