Filling List Box Using MFC's DDX Facility (141498)


The information in this article applies to:

  • The Microsoft Foundation Classes (MFC), when used with:
    • Microsoft Visual C++, 32-bit Editions 4.0
    • Microsoft Visual C++, 32-bit Editions 4.1
    • Microsoft Visual C++, 32-bit Enterprise Edition 4.2
    • Microsoft Visual C++, 32-bit Enterprise Edition 5.0
    • Microsoft Visual C++, 32-bit Enterprise Edition 6.0
    • Microsoft Visual C++, 32-bit Professional Edition 4.2
    • Microsoft Visual C++, 32-bit Professional Edition 5.0
    • Microsoft Visual C++, 32-bit Professional Edition 6.0
    • Microsoft Visual C++, 32-bit Learning Edition 6.0
This article was previously published under Q141498
This is the 32-bit version of this sample.

SUMMARY

The Lstddx32 sample illustrates a technique for filling both an ordinary list box control and the list box portion of a combo box control with data, and using the Microsoft Foundation Class (MFC) Dialog Data Exchange (DDX) facility to return the selection.

The following files are available for download from the Microsoft Download Center:

Visual C++ 6.0

Lstddx32.exe

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.

Visual C++ .NET

DownloadDownload Lstddx32vcnet.exe now

Release Date: June 26, 2002

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.

NOTE: Use the -d option when running LSTDDX32.EXE to decompress the file and recreate the proper directory structure.

MORE INFORMATION

A common misconception with regard to DDX is that assigning a value to a DDX variable will cause that data to be loaded into a control. This does in fact happen for edit controls, but not for list box controls. In order to add items to a list box the dialog class must use the CListBox::AddString() or CComboBox::AddString() functions. Doing this involves several steps which are illustrated by this sample.

The sample itself was initially created as an MDI application using AppWizard from Visual C++ version 1.0. AppStudio was then used to create a dialog which contains OK and Cancel button plus an edit control (IDC_EDIT1), a combo control (IDC_COMBO1), and a list box control (IDC_LIST1). The Class Wizard was used to create a class CDialog1 based on CDialog. The files dialog1.h and dialog1.cpp contain the code for this class. Class Wizard was also used to add DDX member variables m_edit1, m_combo1, and m_list1 to dialog1.h. A menu item was added to the view menu (IDR_LIST_DTYPE) using AppStudio, and a message handler added which will call the dialog when the menu item was selected.

The Readme.txt file included with the sample explains in more detail how the list boxes are initialized and how data is passed between the calling routine and the dialog procedure.
Modification Type:MinorLast Reviewed:8/5/2004
Keywords:kbdownload kbcode kbCtrl kbfile kbinfo kbListBox kbSample KbUIDesign KB141498
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