EN_CHANGE and CEdit, simple question - C / C++ / MFC Discussion Boards

Joaquín M López Muñoz29-Aug-02 7:26

29-Aug-02 7:26

Start with a wizard generated SDI app: when selecting the type of view, choose it to be derived from CFormView. Now you've got a CFormView which plays a very similar role to a CDialog, try migrating the code of some of your dialogs to it (ETSManager and all). The data is supposed to live in a CDocument-derived class: this is initially almost empty, but you can easily plug your data management routines there. Views are not meant to hold nor serialize any piece of data, but instead they shouuld be accesing it thru the document class (see CView::GetDocument). By the time you've managed to get this working you'll be familiar enough with the framework to attempt MDI, which allows you to have multiple docs and views open at a time.

Apart from this, try searching any tutorial on SDI/MDI on the net.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: HELP!!!

Nitron29-Aug-02 7:54

Nitron

29-Aug-02 7:54

thanx.

Nitron
_________________________________________--
message sent on 100% recycled electrons.

forcing window repaint

TimWallace29-Aug-02 7:14

TimWallace

29-Aug-02 7:14

This is driving me nuts! In one of my windows, I want to bitblt a particular bitmap when the mouse is over a given region. Everything works except the window repainting itself. The region in question is at one edge of the window. If I mouse over that region, then go off the window and click the window under it and then bring my window back to the front, the bitmap has been blitted. In a nutshell, I do the following:

- in response to WM_MOUSEMOVE I test to see if in the region; if so, I set a flag. I invalidate that rectangle and do an UpdateWindow to force a WM_PAINT

- in response to WM_PAINT, I call my function that does the blitting of the bmp.

Is there something special about drawing on a window that I'm missing?!

things could always be worse...

Re: forcing window repaint

Joaquín M López Muñoz29-Aug-02 7:17

Joaquín M López Muñoz

29-Aug-02 7:17

...I invalidate that rectangle and do an UpdateWindow to force a WM_PAINT

Try (for debugging purposes) invalidating the whole window instead. If this causes the window to be correctly repainted, then probably you're miscalculating the dimensions of the rectangle.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: forcing window repaint

lucy29-Aug-02 9:59

lucy

29-Aug-02 9:59

also, you might want to track WM_MOUSELEAVE message.

here is a snip to how to get this message:

// we want to know when the mouse is leaving
TRACKMOUSEEVENT structEventTrack;
structEventTrack.cbSize = sizeof(structEventTrack);
structEventTrack.dwFlags = TME_LEAVE;
structEventTrack.hwndTrack = this->GetSafeHwnd();
structEventTrack.dwHoverTime = HOVER_DEFAULT; // this is not used, though

_TrackMouseEvent(&structEventTrack); // we want to receive WM_MOUSELEAVE message

and in your handler to WM_MOUSELEAVE message, you might want to clear your flags which was set during mousemove.

Lexical matching - wildcard type

Sayan Mukherjee29-Aug-02 5:54

Sayan Mukherjee

29-Aug-02 5:54

Hi,

I need to get hold of some algorithm for doing lexicographic text
matching - the way it works for wildcard. Could anybody give me
some URL or article extract?

e.g.:
abc* matches abcdef but does not match abdef.

?XYZ matches MXYZ but does not match MNXYZ.

With best regards,
Sayan
Email:sayanmukherjee@indiatimes.com

Re: Lexical matching - wildcard type

C^hris L^osinger29-Aug-02 6:04

C^hris L^osinger

29-Aug-02 6:04

see http://www.codeproject.com/string/wildcmp.asp[^]

For men use, if they have an evil turn, to write it in marble:
and whoso doth us a good turn we write it in dust.
-- Sir Thomas More

image effects!

EN_CHANGE and CEdit, simple question

ns29-Aug-02 5:46

29-Aug-02 5:46

A dilemma:

I want a "done" button to be disabled until the user adds omething to the CEdit. Fine. I trapped the EN_CHANGE, and the button comes alive as soon as the user enters anything. Problem is, I dont ever want this field to be empty, and if after typing a letter in, the user goes back and deletes it, my "done" button is still enabled. It should only be enabled when theres something in the CEdit.
How do I do this?

======================================================================================
My other tactic was to test when the "done' was pressed like this(below) but it freezes my program and doesnt give me a chance to enter something into the CEdit:

void CDlgMineName::OnButtonDone() 
{

	CString UserEntry;

	m_editMineName.GetWindowText(UserEntry);

	while (UserEntry =="")
	{
		m_editMineName.SetFocus();

		m_editMineName.GetWindowText(UserEntry);<code>why cant I enter anything here? </code>
	}

	It freezes  and I have to kill it from task manager. Is it obvious why ?

Thanks,
ns

Re: EN_CHANGE and CEdit, simple question

Tomasz Sowinski29-Aug-02 5:49

Tomasz Sowinski

29-Aug-02 5:49

ns wrote:
I trapped the EN_CHANGE,

So EN_CHANGE isn't sent when user deletes text from edit control?

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

Free your mind and your ass will follow.

Re: EN_CHANGE and CEdit, simple question

ns29-Aug-02 5:58

29-Aug-02 5:58

It probably is, but heres what I do in the function:

void CDlgMineName::OnChangeEditminename() 
{


	m_buttonminename.EnableWindow(TRUE);

}

If the change was of a "negative type" i.e. nothings left in the CEdit, I want to EnableWindow(FALSE), so should I do a GetWindowText in this event and see if its empty?

void CDlgMineName::OnChangeEditminename() 
{
        CString abc;
        m_myEdit.GetWindowText(abc);
        if(abc=="")
        {
            m_buttonminename.EnableWindow(FALSE);
         }
         else
         {
	    m_buttonminename.EnableWindow(TRUE);
          }

}

What do you think about this? Too contrived?

Thanks,
ns Smile | :)

Re: EN_CHANGE and CEdit, simple question

Tomasz Sowinski29-Aug-02 6:07

Tomasz Sowinski

29-Aug-02 6:07

One line does it all:

m_button.EnableWindow(m_edit.GetWindowTextLength() > 0);

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

Free your mind and your ass will follow.

Re: EN_CHANGE and CEdit, simple question

Roger Allen29-Aug-02 5:56

Roger Allen

29-Aug-02 5:56

For the EN_CHANGE you would just write

CString name ;
m_editMineName.GetWindowText(name) ;
GetDlgItem(IDC_BUTTON_DONE)->EnableWindow(name.GetLength() > 0) ;

Roger Allen
Sonork 100.10016

I think I need a new quote, I am on the prowl, so look out for a soft cute furry looking animal, which is really a Hippo in disguise. Its probably me.

Very cool!

ns29-Aug-02 6:03

29-Aug-02 6:03

Thanks! I was going about doing that but I really like your succintness and style!
Thanks,
ns

Re: EN_CHANGE and CEdit, simple question

Sayan Mukherjee29-Aug-02 6:22

Sayan Mukherjee

29-Aug-02 6:22

Hi,

Please find below a possible way to do it using MFC. It is in your lines
of thought and EN_CHANGE does it.

When the application starts the button will be disabled. As you type in the
edit box or delete text EN_CHANGE fires. Keep on measuring the length of the
string.

Code follows:
Class declaration:

<br />
class CEditControlDlg : public CDialog<br />
{<br />
// Construction<br />
public:<br />
 CEdit *m_pEdit; // Added by Sayan<br />
 CButton *m_pButton; // Added by Sayan<br />
<br />
 CEditControlDlg(CWnd* pParent = NULL);	// standard constructor<br />
// ...<br />
// ...<br />
}<br />

Function definition - InitDialog():

<br />
BOOL CEditControlDlg::OnInitDialog()<br />
{<br />
 CDialog::OnInitDialog();<br />
<br />
 // Set the icon for this dialog.  The framework does this automatically<br />
 //  when the application's main window is not a dialog<br />
 SetIcon(m_hIcon, TRUE);			// Set big icon<br />
 SetIcon(m_hIcon, FALSE);		// Set small icon<br />
	<br />
 // TODO: Add extra initialization here<br />
 m_pEdit = (CEdit *)GetDlgItem(EF_TEXT); // Added by Sayan<br />
 m_pButton = (CButton *)GetDlgItem(PB_DONE); // Added by Sayan<br />
<br />
 m_pButton->EnableWindow(FALSE); // Added by Sayan<br />
 return TRUE;  // return TRUE  unless you set the focus to a control<br />
}<br />

Function definition - EN_CHANGE handler function:

<br />
void CEditControlDlg::OnChangeText() <br />
{<br />
 // TODO: If this is a RICHEDIT control, the control will not<br />
 // send this notification unless you override the CDialog::OnInitDialog()<br />
 // function and call CRichEditCtrl().SetEventMask()<br />
 // with the ENM_CHANGE flag ORed into the mask.<br />
	<br />
 // TODO: Add your control notification handler code here<br />
 CString strText;<br />
<br />
 m_pEdit->GetWindowText(strText);<br />
<br />
 if (!strText.GetLength())<br />
 {<br />
 	m_pButton->EnableWindow(FALSE);<br />
 }<br />
 else<br />
 {<br />
 	m_pButton->EnableWindow();<br />
 }<br />
}<br />

With best regards,
Sayan
Email:sayanmukherjee@indiatimes.com

Excel locks up

Zizilamoroso29-Aug-02 5:28

Zizilamoroso

29-Aug-02 5:28

I'm automating Excel from C++ using OLE.

Sometimes, I give a command to excel. Excel handles the command and finishes it, BUT excel doesn't return back to my c++ app.

In my c++ app, I'm calling pDispatch->Invoke(...), the method or property is indeed invoked, you can see the result in the excel sheet. But the invoke method never returns and hangs...

My guess is that it's wndmessage-related.
btw. my app is in fact an mfc-dll. InitInstance() is called but Run() is never called.

Anybody knows why? Do I have to override the excel messagepump?

PLEASE, any suggestions are fine...
tnx

[VISUAL STUDIO 6.0] [MFC] [WIN98/2]

Bluute tette! Dead | X|

Can Visual C++ (6.0) print the whole List Box contents?

Anonymous29-Aug-02 5:09

Anonymous

29-Aug-02 5:09

Hi,

I would like to print all the contents of a List Box from the Start to the End (some time the list is very long & it shows only protion of it in the screen) including its Header columns titles

Is there any samples about this?

I appreciate any help & guideline here!

Thanks,

Timer IDs

JohnnyG29-Aug-02 4:39

JohnnyG

29-Aug-02 4:39

Are they global (Windows) scope or application scope? Just curious about that but I have a view with a timer in it. My application creates two instances of this view in splitter window panes. Of course for now, each view has the same timer ID which is effecting what I'm doing. But, I was wondering if I pick two random numbers or two different hard coded values will they be effected by any other timers running in different applications if a developer of those "other" applications used the same ID.

Re: Timer IDs

C^hris L^osinger29-Aug-02 4:42

C^hris L^osinger

29-Aug-02 4:42

i believe they are application scope. otherwise, your app would be receiving timer messages from every other app out running on your system - this would be a tremendous waste of CPU cycles, IMO.

-c

For men use, if they have an evil turn, to write it in marble:
and whoso doth us a good turn we write it in dust.
-- Sir Thomas More

image effects!

Re: Timer IDs

Tomasz Sowinski29-Aug-02 4:45

Tomasz Sowinski

29-Aug-02 4:45

Not global. IDs must be unique per HWND.

"If the hWnd parameter is not NULL and the window specified by hWnd already has a timer with the value nIDEvent, then the existing timer is replaced by the new timer. When SetTimer replaces a timer, the timer is reset. Therefore, a message will be sent after the current time-out value elapses, but the previously set time-out value is ignored." (from MSDN docs on SetTimer).

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

Free your mind and your ass will follow.

Re: Timer IDs

JohnnyG29-Aug-02 4:45

JohnnyG

29-Aug-02 4:45

Wow! That was quick. OMG | :OMG:

Thanks, Guys.

CRecordView has no DoModal function

gate7ole29-Aug-02 3:51

gate7ole

29-Aug-02 3:51

Working with VC++ 6.0 I have a problem. The CRecordView class has no DoModal() function.So I don't know how to call a dialog based on CRecordView from another dialog (based on CView for example).

E.g I tried to call a dialog with class name CRecView (based on CRecordView):

void CTestDlg::OnButton1()
{
CRecView m_Dlg1;
m_Dlg1.DoModal();
}

but without the DoModal function I can't do it.

Re: CRecordView has no DoModal function

Tomasz Sowinski29-Aug-02 4:14

Tomasz Sowinski

29-Aug-02 4:14

This article demonstates how to use CHtmlView in dialog, but the solution should work with other view classes as well. You may use it as a start point:

http://www.microsoft.com/msj/0100/c++/c++0100.asp[^]

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

Free your mind and your ass will follow.

CRecordView has no DoModal function

Anonymous29-Aug-02 3:51

Anonymous

29-Aug-02 3:51

Redistribution question

ns29-Aug-02 2:36

29-Aug-02 2:36

I will be packaging my MFC app with Wise.Theres a third party control that requires that olepro32 and oleaut32 be registered and installed on the users machine. I guess my question is, that if I ship the version they suggest, they are older than whats already on my win2k. If the user has newer dlls too, then these older ones I distribute wont overwrite them right? (In which case, the app should still work, I hope.).

If my shipped dlls are newer than the users dlls, then it wont mess up their machine to install mine - is that right?

Thanks,
ns

Re: Redistribution question

Tomasz Sowinski29-Aug-02 2:54

Tomasz Sowinski

29-Aug-02 2:54

ns wrote:
If the user has newer dlls too, then these older ones I distribute wont overwrite them right?

Well, it depends on the installer. I don't know Wise, but I'm pretty sure you can control the way files are copied - there should be an option 'leave existing file if its version is more recent'. At least there's something like this in InstallShield.

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

Free your mind and your ass will follow.

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