Re: OnItemChanged() - how to "reset" it? - C / C++ / MFC Discussion Boards

_Theo_18-Mar-03 0:14

18-Mar-03 0:14

You can convert the wchar_t * to char * with one of the following functions:

- wcstombs (include stdlib.h)
- WideCharToMultiByte (include winnls.h)

Re: Real quick question...

Lakitu18-Mar-03 0:16

Lakitu

18-Mar-03 0:16

Use the WideCharToMultiByte() API. It's documented in MSDN. Set the cbMultiByte parameter to 0 to determine the length of the target (ASCII) buffer. Then allocate a char buffer and call the API again to do the actual conversion.

If a train station is where the train stops, what's a workstation...?

Disable overlay for a MCI window ?

squizz17-Mar-03 11:41

squizz

17-Mar-03 11:41

Hi,
I create a MCI control window with 'MCIWndCreate' to play an avi file.
I want to disable overlay to make a bitblt from the video to a static control.
With overlay activated (the default behaviour) I only get a black rectangle.

Is there a way to disable overlay or does another control allow frame grabbing ?

thx.

OnItemChanged() - how to "reset" it?

ns17-Mar-03 10:59

17-Mar-03 10:59

I have a combobox and a clistCtrl. In the listCtrl I have several items that are relevant to all the entries in the combobox. So for example I have file1 and file2 in the combo, and the values iI can set for these files are isted in the listctrl. Now in the OnItemCChanged I go and do stuff. THe only problem is that if the listCtrl had an item selected in it for the first file, file1, then when I switch to file2, and want to set its value for that same list item, the OnChanged doesnt fire since its really not changed. How can I "reset" the listctrl so that it responds to any item I click on when I'm gathering info for file2 , even if it happens to be the same one I last clicked on for file1. I need to start back afresh at the first item in the list....or with nothing as the selected item . How to make it forget soimething wasa selected, and behave as it does when running for the first time?

Appreciate your help,
ns

Re: OnItemChanged() - how to "reset" it?

Ravi Bhavnani17-Mar-03 11:11

Ravi Bhavnani

17-Mar-03 11:11

Seems that when you handle changes to the combo box, you want to repopulate the list control with entries that pertain to the combo box selection. In this case, DeleteAllItems() and add the new ones in the list control.

In the interests of user-friendliness, you may want to also preselect the first (or most appropriate) item in the list control after populating it.

/ravi

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

Re: OnItemChanged() - how to "reset" it?

ns17-Mar-03 11:14

17-Mar-03 11:14

How do you preselect an item?

Re: OnItemChanged() - how to "reset" it?

Ravi Bhavnani17-Mar-03 11:37

Ravi Bhavnani

17-Mar-03 11:37

m_listctrl.SetItemState
  (nIndex,
   LVIS_SELECTED | LVIS_FOCUSED,
   LVIS_SELECTED | LVIS_FOCUSED);

Bug me to send you my collection of handy-dandy list/tree control functions. (They're @ home).

/ravi

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

Re: OnItemChanged() - how to "reset" it?

nss17-Mar-03 12:18

nss

17-Mar-03 12:18

And its great to have you back......

Columns in CListCtrl

MemLeak17-Mar-03 10:26

MemLeak

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

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