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example-displaying-a-dialog-box-via-a-menu-command.md

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description title ms.date helpviewer_keywords ms.assetid
Learn more about: Example: Displaying a Dialog Box via a Menu Command
Example: Displaying a Dialog Box via a Menu Command
09/07/2019
MFC dialog boxes [MFC], examples
MFC dialog boxes [MFC], displaying
modeless dialog boxes [MFC], displaying
dialog boxes [MFC], MFC
modal dialog boxes [MFC], displaying
examples [MFC], dialog boxes
menu items [MFC], examples
e8692549-acd7-478f-9c5e-ba310ce8cccd

Example: Displaying a Dialog Box via a Menu Command

This topic contains procedures to:

  • Display a modal dialog box through a menu command.

  • Display a modeless dialog box through a menu command.

Both sample procedures are for MFC applications and will work in an application you create with the MFC Application Wizard.

The procedures use the following names and values:

Item Name or value
Application DisplayDialog
Menu command Test command on View menu; Command ID = ID_VIEW_TEST
Dialog box Test dialog box; Class = CTestDialog; Header file = TestDialog.h; Variable = testdlg, ptestdlg
Command handler OnViewTest

To display a modal dialog box

  1. Create the menu command; see Creating Menus or Menu Items.

  2. Create the dialog box; see Starting the Dialog Editor.

  3. Add a class for your dialog box. See Adding a Class for more information.

  4. In Class View, select the document class (CDisplayDialogDoc). In the Properties window, click the Events button. Double-click the ID of the menu command (ID_VIEW_TEST). Next, click the down arrow and select <Add> OnViewTest.

    If you added the menu command to the mainframe of an MDI application, select the application class (CDisplayDialogApp) instead.

  5. Add the following include statement to CDisplayDialogDoc.cpp (or CDisplayDialogApp.cpp) after the existing include statements:

    #include "TestDialog.h"

  6. Add the following code to OnViewTest to implement the function:

    CTestDialog testdlg;
testdlg.DoModal();

To display a modeless dialog box

  1. Do the first four steps to display a modal dialog box, except select the view class (CDisplayDialogView) in step 4.

  2. Edit DisplayDialogView.h:

    • Declare the dialog box class preceding the first class declaration:
    class CTestDialog;
    • Declare a pointer to the dialog box after the Attributes public section:
    CTestDialog* m_pTestDlg;

  3. Edit DisplayDialogView.cpp:

    • Add the following include statement after the existing include statements:
    #include "TestDialog.h"
    • Add the following code to the constructor:
    m_pTestDlg = NULL;
    • Add the following code to the destructor:
    delete m_pTestDlg;
    • Add the following code to OnViewTest to implement the function:
    if (NULL == m_pTestDlg)
{
   m_pTestDlg = new CTestDialog(this);
   m_pTestDlg->Create(CTestDialog::IDD, this);
}
m_pTestDlg->ShowWindow(SW_SHOW);

See also

Dialog Boxes
Modal and Modeless Dialog Boxes