C / C++ / MFC

6-Oct-05 21:20

Hello again guys.

As my project is almost finish, I have few bugs and some display problems.
As I created a SDI CHtmlView base class in MFC/VC++. When the application is launched, it works fine. When I select a new IE window or any other window application on top of my project's application and then click the scroll bar from my project's application, my project displayed white background from the remnant of the other window application. I don't know why this is happens. I don't know if it can be fix in program or Windows problem or what?. It only happens when clicking the scroll bar of my project's application that is behind of other window application. If I only click any part of my project's window, that behavior didn't occur. Confused | :confused:

Any idea why this behaviors happen? I tried googling this behavior but can't find any related topic with this.

With great power comes a great responsibility.

KaЯl7-Oct-05 2:02

KaЯl

7-Oct-05 2:02

To be sure all the window is added to the clipping region, you could invalidate all the window (using CWnd::InvalidateRect(NULL)) when it gets the focus, or when the scrolling is activated.

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babyspidy7-Oct-05 4:28

7-Oct-05 4:28

Thanks for your reply.
However, I'm just a newbie with MFC, may I ask how can I do that?
or where part in my code do I put that CWnd::InvalidateRect(NULL)?
Sorry for asking more.

Thanks a lot.

With great power comes a great responsibility.

KaЯl7-Oct-05 4:44

KaЯl

7-Oct-05 4:44

You could do this by catching the messages WM_HSCROLL and WM_VSCROLL

<code>
void CMyView::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	InvalidateRect(NULL);
	<CBaseView>::OnHScroll(nSBCode, nPos, pScrollBar);	
}

void CMyView::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	InvalidateRect(NULL);
	<CBaseView>::OnVScroll(nSBCode, nPos, pScrollBar);	
}

Replace CBaseView by the name of the base class view you use (CHtlmView I presume)
This code will ensure all the window will be marked as to be redrawn.

Hope this work Smile | :)

The great error of nearly all studies of war has been to consider war as an episode in foreign policies, when it is an act of interior politics - Simone Weil
Fold with us! ¤ flickr

babyspidy7-Oct-05 5:00

7-Oct-05 5:00

Thanks again.
I tried your code, but still there's a white remnant when I click the scroll bar. I just delete the '::' from OnVScroll and OnHScroll in order not to catch an error upon compiling. . Confused | :confused:

Ok, I get a handle for WM_HSCROLL and WM_VSCROLL in PreTranslateMessage(MSG* pMsg). I don't know what attributes will I put in OnVScroll(..) and OnHScroll(..).

With great power comes a great responsibility.

-- modified at 11:04 Friday 7th October, 2005

babyspidy7-Oct-05 4:47

Re: MFC Radio Buttons issue

7-Oct-05 4:47

Ok, as you suggested using InvalidateRect(NULL) and as I read from microsoft's site, here's what I did on my project.

At my CMyProjectView.cpp, I made this.

void CMyProjectView.cpp::OnUpdate()
{
InvalidateRect(NULL);
return;
}

but nothing's happened when I run again my project. Confused | :confused:

With great power comes a great responsibility.

MFC Radio Buttons issue

Axonn Echysttas6-Oct-05 21:18

Axonn Echysttas

6-Oct-05 21:18

Hello again people ::- ). My troubles with the MFC radio buttons aren't over. Even though I think I did everything right, something still doesn't work. I put 5 radio buttons and selected the "GROUP" flag only for one of them, as this should be done. Then, to that one radio button, I mapped an m_iSelected member variable using the Class Wizard. The Class Wizard naturally initializes this to -1 and as far as I understood, when the user selects another radio button, in this m_iSelected there should be the index of the selected radio button. If I select the 3rd radio, its value should be 2. Well, it's still -1 no matter what I do. Any idea what's the problem? Thanks ::- ).

-= E C H Y S T T A S =-
The Greater Mind Balance

Roger Stoltz6-Oct-05 21:37

Roger Stoltz

6-Oct-05 21:37

Well, this behaviour is by design.
When you use ClassWizard to add such a variable you let the value of the variable to be updated when DoDataExchange is called. Call UpdateData and m_iSelected is updated since the framework will call DoDataExchange for you.

Perhaps you want to use ON_COMMAND_RANGE instead to have a message handler to be called when you click one of the radio buttons and update your variable in the message handler not using DDX.

Hope this helps
--
Roger

Re: MFC Radio Buttons issue

Mircea Puiu6-Oct-05 21:41

Mircea Puiu

6-Oct-05 21:41

Of course it shows unchanged Smile | :)

Make a call to UpdateData(TRUE)
before useng the value of m_iSelected.

SkyWalker

Re: MFC Radio Buttons issue

Axonn Echysttas6-Oct-05 22:11

Axonn Echysttas

6-Oct-05 22:11

Thanks Roger Stoltz & Mircea Puiu. It works now. Hooray.

-= E C H Y S T T A S =-
The Greater Mind Balance

SetWindowLong throwing ERROR_ACCESS_DENIED

Anonymous6-Oct-05 21:14

Anonymous

6-Oct-05 21:14

Hi everybody, this is the first time Im posting on these boards. I've gotten allot of good information here so I thought Id ask here first.

Im currently hooking into the SHELLDLL_Defview thread of the Program Manager. The hook is of type WH_CALLWNDPROC. Once my callback function kicks in, I use it to call SetWindowLong to replace the Windows process. Everything is fine up till this point. The problem I have is when I try to unhook. Before I extract the hook, I make another call to SetWindowLong to replace the origional Window process. Ive checked the values of my parameters before the call and they are good. I end up getting a ERROR_ACCESS_DENIED. Now, I know that the call in the CallWndProc procedure works fine. Why is it only when I go to put the stuff back that I get the error?

Dialog box Static text

karmendra_js6-Oct-05 20:44

karmendra_js

6-Oct-05 20:44

I have a dialog box with an Editbox.

I just want to have an Static text int he dialog box which will display number of characters present in the Editbox

Thanks a lot for your time and help.

toxcct6-Oct-05 20:59

toxcct

6-Oct-05 20:59

CString str = "";
 
((CEdit*)GetDlgItem(IDC_MY_EDIT))->GetWindowText(str);
str.Format("%d", str.GetLength());
((CStatic*)GetDlgItem(IDC_My_STATIC))->SetWindowText(str);

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[toxcct][VisualCalc]

Cedric Moonen6-Oct-05 21:00

Cedric Moonen

6-Oct-05 21:00

What you can do is set the text of your static control whenever something changes in the EditBox. Here how to do that:

1) Go to class wizzard and add a handler function for the 'change text' message (I don't remember which message exactly.
2) In this handler function Retrieve the text of your EditBox (GetWindowText) and calculate his length (with strlen).
3) Format this value in a new string (with sprintf) and set the text of the static control (SetWindowText)

ThatsAlok6-Oct-05 21:08

ThatsAlok

6-Oct-05 21:08

cedric moonen wrote:
What you can do is set the text of your static control whenever something changes in the EditBox. Here how to do that:

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