CAccessReports – Class for Printing and Viewing MS Access Reports


This article was contributed by Tom Archer.

Environment: Source will work on VC++ 5 and higher. However, the demo application will only
work on VC++ 6 and higher as it uses the CHtmlView class.

This class (CAccessReports) was created for those of us who have the misfortune of
having to 1) use the MS Access database engine and 2) use the MS Access database engine from a
Visual C++ application. The CAccessReports class uses the Access Automation objects
to open a specified database, run a report (within Access), print the report and save the Access
database in HTML format so that it
can be viewed in a Visual C++ application. You can accomplish each of these tasks with a single
line of code. Here are some examples of how to use the CAccessReports class.

Examples of how to use the CAccessReports class

When you download the source code for the CAccessReports, you will also find a
full-fledged test application. However, it’s always nice to be able to see what you’re getting
before you invest the time in downloading, unzipping and running someone else’s code. Therefore,
here are some code snippets that show how easy the
CAccessReports class is to use.

  • Instantiating a CAccessReports object
  • How you choose to instantiate CAccessReports object depends
    on how you plan to use it in your application. The first argument of the
    CAccessReports is the fully qualified name of the database file.
    The second argument specifies whether you want the CAccessReports
    class to preload all of the report names. An example of when you would want
    the class to retrieve all of the report names is if your application needs to
    display a list of the reports to the end-user. Otherwise, if you are instantiating
    a CAccessReports object in order to run, print or display specific reports whose
    names are known at compile-time, you can pass a value of FALSE for this
    argument.

    // Have the CAccessReports object load the report names
    CAccessReports accessReports(YOUR_ACCESS_DATABASE, TRUE);

    // Simply attach to the specified Access database
    CAccessReports accessReports(YOUR_ACCESS_DATABASE, FALSE);

  • Getting a List of Reports from an Access Database
  • If you specified a value of TRUE for the second argument of the
    CAcessReport constructor, you can then retrieve the list of reports
    for a given Access database. Here's an example of a simple loop to retrieve
    and display all of the report names.

    CAccessReports accessReports(YOUR_ACCESS_DATABASE, TRUE);

    for (int i = 0; i < accessReports.m_reports.GetSize(); i++) { AfxMessageBox(accessReports.m_reports[i]); }

  • Running an Access Report
  • While the CAccessReports class does allow you to display an Access report
    from a Visual C++ application (shown below), there are still valid reasons to run the
    report from within Access. Therefore, the RunReport member function does exactly
    that.

    CAccessReports accessReports(YOUR_ACCESS_DATABASE, FALSE);
    accessReports.RunReport(YOUR_REPORT_NAME);

  • Printing an Access Report
  • The PrintReport function takes as its only argument the name of a report to print.
    This function calls RunReport and then uses Automation to print the report.

    CAccessReports accessReports(YOUR_ACCESS_DATABASE, FALSE);
    accessReports.PrintReport(YOUR_REPORT_NAME);

  • Displaying an Access Report (Visual C++ 6.0)
  • Access Automation doesn't allow for the ability to redirect the output of a report to a
    given window. However, it does allow for a report to be run and then saved in HTML format. That
    combined with the new Visual C++ 6.0 CHtmlView gives you the ability to run an
    Access report and display it in a Visual C++ application. In the example below,
    CAccessReportView is a CHtmlView derived class.

    void CAccessReportView::OnInitialUpdate()
    {
    CHtmlView::OnInitialUpdate();

    CAccessReports accessReports(YOUR_ACCESS_DATABASE, FALSE);
    accessReports.SaveAsHtml(YOUR_REPORT_NAME, DESTINATION_FOLDER);
    Navigate2(FULLY_QUALIFIED_FILE_NAME, NULL, NULL);
    }

  • Displaying an Access Report (Visual C++ 5.0)
  • Unfortunately, Visual C++ 5.0 does not have the CHtmlView class.
    However, you can still display Access reports using the WebBrowser
    control (in the Visual C++ Component Gallery). In order to display the Access
    report in a Visual C++ 5 application, simply instantiate a
    CAccessReports object, call its SaveAsHtml
    member function and then call the WebBrowser control's
    Navigate function specifying the name of the HTML file.

    Notes

    • 1. Access Automation can not be used to get the entire list of
      reports for a an Access database. Therefore, if you
      specify TRUE to the second argument of the
      CAccessReports constructor, the class attempts to use
      the MFC DAO classes to access the msysobjects table of the specified
      database. In order to accomplish this, you must


      give the Admin
      user "read" priveleges to the database's msysobjects table.

      If your application is printing or viewing
      a specific report from a specific database and you don't need the list of
      reports, then this limitation does not apply. If anyone knows of a better
      way of doing this, I'm always open to learning new things :)

    Downloads

    Download source - 38 KB
    Download demo project - 60 KB

    Date Last Updated: October 22, 2000

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