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The CPrintDialog class encapsulates the services provided by the Windows common dialog box for printing. Common print dialog boxes provide an easy way to implement Print and Print Setup dialog boxes in a manner consistent with Windows standards.

If you wish, you can rely on the framework to handle many aspects of the printing process for your application. In this case, the framework automatically displays the Windows common dialog box for printing. You can also have the framework handle printing for your application but override the common Print dialog box with your own print dialog box. For more information on using the framework to handle printing tasks, see the article in Visual C++ Programmer’s Guide.

If you want your application to handle printing without the framework’s involvement, you can use the CPrintDialog class “as is” with the constructor provided, or you can derive your own dialog class from CPrintDialog and write a constructor to suit your needs. In either case, these dialog boxes will behave like standard MFC dialog boxes because they are derived from class CCommonDialog.

To use a CPrintDialog object, first create the object using the CPrintDialog constructor. Once the dialog box has been constructed, you can set or modify any values in the m_pd structure to initialize the values of the dialog box’s controls. The m_pd structure is of type . For more information on this structure, see the Win32 SDK documentation.

If you do not supply your own handles in m_pd for the hDevMode and hDevNames members, be sure to call the Windows function GlobalFree for these handles when you are done with the dialog box. When using the framework’s Print Setup implementation provided by CWinApp::OnFilePrintSetup, you do not have to free these handles. The handles are maintained by CWinApp and are freed in CWinApp’s destructor. It is only necessary to free these handles when using CPrintDialog stand-alone.

After initializing the dialog box controls, call the DoModal member function to display the dialog box and allow the user to select print options. DoModal returns whether the user selected the OK (IDOK) or Cancel (IDCANCEL) button.

If DoModal returns IDOK, you can use one of CPrintDialog’s member functions to retrieve the information input by the user.

The CPrintDialog::GetDefaults member function is useful for retrieving the current printer defaults without displaying a dialog box. This member function requires no user interaction.

You can use the Windows CommDlgExtendedError function to determine whether an error occurred during initialization of the dialog box and to learn more about the error. For more information on this function, see the Win32 SDK documentation.

CPrintDialog relies on the COMMDLG.DLL file that ships with Windows versions 3.1 and later.

To customize the dialog box, derive a class from CPrintDialog, provide a custom dialog template, and add a message map to process the notification messages from the extended controls. Any unprocessed messages should be passed on to the base class. Customizing the hook function is not required.

To process the same message differently depending on whether the dialog box is Print or Print Setup, you must derive a class for each dialog box. You must also override the Windows AttachOnSetup function, which handles the creation of a new dialog box when the Print Setup button is selected within a Print dialog box.

For more information on using CPrintDialog, see in Visual C++ Programmer’s Guide.

#include <afxdlgs.h>

Class MembersBase ClassHierarchy Chart


See Also   CPrintInfo