Solved

combobox

Posted on 2002-04-13
8
917 Views
Last Modified: 2013-11-20
Hi!
i currently use a combobox control, and some code is executed on the "onchange" event. well, now i want to dynamicly change the selection of the combo. so i call the SetCurSel method, but the "onchange" event isn't sent anymore. (i tyed combo->PostMessage(CBN_SELCHANGE), it doesn't work (i think the message is pending).

regards, Ralph
0
Comment
Question by:ralph78
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 2
8 Comments
 
LVL 6

Expert Comment

by:Triskelion
ID: 6939127
Call the onchange yourself after calling the SecCurSel.
0
 
LVL 6

Expert Comment

by:Triskelion
ID: 6939142
Don't post the message.
Add a function to the  CBN_SELCHANGE message in ClassWizard.
Then call it from the other function you use to SetCurSel();

I made a CFormView app for this test.
// Here is the message map showing the trapping of the CBN_SELCHANGE message
// The app also has a button that I use to set the current
// selection to offset #2.

BEGIN_MESSAGE_MAP(CMy20288603View, CFormView)
     //{{AFX_MSG_MAP(CMy20288603View)
     ON_CBN_SELCHANGE(IDC_COMBO_CHANGE_ME, OnSelchangeComboChangeMe)
     ON_BN_CLICKED(IDC_BUTTON_CHANGE, OnButtonChange)
     //}}AFX_MSG_MAP
END_MESSAGE_MAP()


/////////////////////////////////////////////////////////////////////////////
// CMy20288603View message handlers

void CMy20288603View::OnSelchangeComboChangeMe()
{
     // TODO: Add your control notification handler code here
     AfxMessageBox("Changed");
}

void CMy20288603View::OnButtonChange()
{
     m_cboChangeMe.SetCurSel(2);
     OnSelchangeComboChangeMe();
}
0
 

Author Comment

by:ralph78
ID: 6941301
well... there is a little problem:
i can't use this method because i only get a CWnd* (so i cast it to CComboBox* when i'm sure it's a combobox, but i can't call a function defined in one particular dialog)...
any idea?
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 6

Expert Comment

by:Triskelion
ID: 6941772
The function is defined in whatever holds the control (View or Dialog).
If you're using a modeless dialog, I believe you can still call public functions defined in it.

What is the action that you want to trigger the change?
0
 

Author Comment

by:ralph78
ID: 6942038
well, actually, i'm working with the viavoice sdk. so when i got a vocal event (a user message is sent to the dialog), i would like to change the value of a combo box. however, i can't use directly this combo. for instance, i can receive the vocal message "setcombo 1015 2" (i'm notified when this sentence is told). so i want the combobox which has the id 1015 change its selected item to its 2sd element.
((CComboBox *)curdlg->GetDlgItem(1015))->SetCurSel(2);
//curdlg is the current dialog box

this way, i cant change the value of the selected item in my combobox, exactly as if i had clicked on it, but the "OnSelChange" function isn't called.
0
 
LVL 6

Expert Comment

by:Triskelion
ID: 6943266
I sincerely don't believe you will be able to force that foreign dialog to recognize the change.
0
 
LVL 4

Accepted Solution

by:
AmitAgarwal earned 50 total points
ID: 6961923
Hi ralph78
try out this
i have created a dialogbased application.


void CTempDlg::OnButton1()
{
     CComboBox* pCombo = (CComboBox*)GetDlgItem(IDC_COMBO1);
     pCombo->SetCurSel(2);


     WPARAM wParam;
     LPARAM lParam;
     wParam = MAKEWPARAM(IDC_COMBO1,CBN_SELCHANGE);
     lParam = (LPARAM)pCombo->m_hWnd;
     ::SendMessage(this->m_hWnd,WM_COMMAND,wParam,lParam);
     
     
}

void CTempDlg::OnSelchangeCombo1()
{
     AfxMessageBox("Sel Change");    
}

hope this will help you
0
 
LVL 6

Expert Comment

by:Triskelion
ID: 6962902
Ralph, you may want to reject my proposed answer if it's not what you're looking for.
If you do, your question will get more exposure and a maybe a better answer.
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Introduction: Hints for the grid button.  Nested classes, templated collections.  Squash that darned bug! Continuing from the sixth article about sudoku.   Open the project in visual studio. First we will finish with the SUD_SETVALUE messa…
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 …
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.
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…

615 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