Zero or One Document Interface (ZODI)

Environment: VC6

What's This?

This article describes how to create a single-document application using a multi-document interface. You may have zero or one documents at a time.

I've written a CMultiDocTemplate-derived class, CZoDocTemplate. It overrides the OpenDocumentFile function. OpenDocumentFile works like CSingleDocTemplate; it reinitializes a created document instead of creating one more document. If there is no opened document, a new document is created as in an MDI case. If you create several document templates, you will have a maximum of one document per template.

To Create Your Own ZODI Application

  1. Create an MDI application with AppWizard.
  2. Add ZoDocTemplate.h and ZoDocTemplate.cpp in your project, named <your app>.
  3. Include ZoDocTemplate.h in <your app>.cpp.
  4. In the InitInstance function, replace:
        CMultiDocTemplate* pDocTemplate;
        pDocTemplate = new CMultiDocTemplate(...);
        CZoDocTemplate* pDocTemplate;
        pDocTemplate = new CZoDocTemplate(...);

Similar Article

Here is a similar article, MSDI. In it, I present another, simpler, way of MSDI implementation. In the MSDI example, when opening a new document, the created one is destroyed and a new one is created. In ZODI, the existing document is reinitialized as in the SDI case.


Download demo project - 21 Kb
Download simple exe - 8 Kb
Download source - 4 Kb


  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Moving from an on-premises environment to Office 365 does not remove the need to plan for disruptions or reduce the business risk requirements for protecting email services. If anything, some risks increase with a move to the cloud. Read how to ease the transition every business faces if considering or already migrating to cloud email. This white paper discusses: Setting expectations when migrating to Office 365 Understanding the implications of relying solely on Exchange Online security Necessary archiving …

  • U.S. companies are desperately trying to recruit and hire skilled software engineers and developers, but there's simply not enough quality talent to go around. In response, companies often resort to inferior solutions -- hiring substandard developers and engineers, recruiting talent on a part-time or temporary basis, poaching people from competitors, or burdening an already stressed IT staff for more of their labor. Fortunately, there's a better solution. Read this white paper to learn the business value of …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date