Solved

How to get a handle to edit control of CComboBox ???

Posted on 2001-08-31
7
2,972 Views
Last Modified: 2013-11-20

 Hello there,
   I created an object of CComboBox with CBS_DROPDOWN style which allows to edit the text.Now I have to implement UNDO functionality in it.But there is no undo method associated with CComboBox.Is there any way to get the handle of Edit Control of it,using which UNDO is possible. If it is not possible.please tell me how to use CComboBoxEx.I tried with that , but it doesn't shows the dropdown list.
please do reply soon.
0
Comment
Question by:Narendra_bt
7 Comments
 
LVL 2

Expert Comment

by:BogdyPtr
ID: 6445782
I don't think it's posible.
To use CComboBoxEx declare a CComboBoxEx var in your window class and after the window was created call Create method for the combobox like in the code below:

m_cbxMyCombo.Create( CBS_DROPDOWN | WS_CHILD | WS_VISIBLE, CRect( 100, 100, 200, 200), this, 1 );    

This should do it.
0
 
LVL 7

Expert Comment

by:jimwasson
ID: 6445832
I think you're looking for GetDlgItem (the MFC version prototype is):
void CWnd::GetDlgItem( int nID, HWND* phWnd ) const

and associated functions GetDlgItemText() and SetDlgItemText.

You can look up the article "Retrieving Data from the Dialog Object" in the Visual Studio help for complete details.
0
 
LVL 1

Expert Comment

by:guoching
ID: 6446709
Since the edit box is a child window of ComboBox,we can use ::ChildWindowFromPoint(HWND,POINT) to get the Handle of Edit.

eg.
POINT ptn;
ptn.x = 2;
ptn.y = 2; //ComboxBox must be larger than two pixel
HWND hEdit = ::ChildWindowFromPoint(combox.m_hWnd,ptn);
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 4

Accepted Solution

by:
jtwine100697 earned 50 total points
ID: 6447069
It is undocumented, but ComboBoxes create their edit control with an ID of 1001, so you should be able to use GetDlgItem(...) to get the handle of the edit control:

    CWnd *pCBEdit = m_cbComboBox.GetDlgItem( 1001 );

-=- James.
0
 

Author Comment

by:Narendra_bt
ID: 6447087

Hello James,
 Thanks,it works perfectly.

Narendra
0
 
LVL 2

Expert Comment

by:BogdyPtr
ID: 6447186
I don't know if it's recomanded to use a undocumented facility. It's undocumented because it my change and may not be avable in the next versions of window. But I think that it's a nice solution. jtwinwe where do u find out this ?
0
 
LVL 4

Expert Comment

by:jtwine100697
ID: 6447703
> I don't know if it's recomanded to use a undocumented facility. It's undocumented because it my change [...]
> and may not be avable in the next versions of window.

With regard to APIs, that is very true.  But this particular behaviour is not likely to change: it has been this way since at least Windows 3.1.  Changing it risks breaking existing apps.

> But I think that it's a nice solution. jtwinwe where do u find out this ?

You can use Spy to determine the IDs of child windows.  It is also documented in an MFC FAQ somewhere.

-=- James.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction: Dialogs (1) modal - maintaining the database. Continuing from the ninth article about sudoku.   You might have heard of modal and modeless dialogs.  Here with this Sudoku application will we use one of each type: a modal dialog …
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
This is used to tweak the memory usage for your computer, it is used for servers more so than workstations but just be careful editing registry settings as it may cause irreversible results. I hold no responsibility for anything you do to the regist…

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now