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(...);
    
    with
        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.

Downloads

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


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