Converting a Win32 Application to ATL

In the midst of all this publicity writing ATL-based applications, you will find little in the way of documentation on porting your legacy Win32 applications to ATL. Hopefully, these steps will ease that migration path.

Migration Steps

  1. Include AtlBase.h file in StdAfx.h after AfxWin.h. This is to take advantage to declare a variable for CComModule. Because AtlWin.h file needs, _Module as variable of CComModule.
    #include <atlbase.h>
    #include <objbase.h>
    
    We have to keep extern because we are originally declaring variable in Application main file.
    extern CComModule _Module;
    
    Then include the remaining files which helps for an ATL Application. In the insert Object of ATL uses ATLHost.h which needs to compile atlcom.h as before.
    #include <atlwin.h>
    #include <atlcom.h>
    
  2. In the StdAfx.cpp, Include AtlImpl.cpp file.
  3. In the main Application file, add the following
    //originally declaring the CComModule variable
    CComModule _Module; 
    
    Then, Add the following two lines, which are required to activate ATL Object Wizard, when you choose Insert ATLObject from Insert Menu.
    BEGIN_OBJECT_MAP(ObjectMap)
    END_OBJECT_MAP()
    
  4. Initialize the CComModule variable with ObjectMap and with the current instance in the WinMain function
    _Module.Init(ObjectMap, hInstance);
    
  5. Add the <ProjectName>.idl file into the project and add the library related code:
    library TestLIB
    {
    }
    
  6. If you want to insert a dialog and want to show. Follow the above steps and declare the variable of ur dialog class and call DoModal with that variable (don't forget to include dlg header file).

Additional Notes

This code has been tested with and works fine with the Windows CE environment.

References and Acknowledgments

  • ATL Internals - Rector, Sells (My thanks to the Authors!)


Comments

  • 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  • Your email address will not be published.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

  • Security tools can't inspect what they can't see. To defend against today's advanced threats, IT organizations require real-time visibility across their entire IT infrastructure—including physical, virtual, and cloud environments. In short, they need a security delivery platform. Download this book to discover how to: Eliminate network blind spots — with a security delivery platform that provides pervasive network visibility Optimize security tool performance and scalability — by sending …

  • Are you weighing the benefits of cloud storage versus on-premises storage? If so, the right answer might be to use both — a mix of on-premises and public cloud services with data mobility between the two platforms. Hybrid has piqued interest as more organizations look to the public cloud to augment their on-premises data management. Analyst firm IDC predicts that by 2018, 85% of enterprises will operate in a multi-cloud environment. Check out this easy-to-absorb infographic to explore five reasons to …

Most Popular Programming Stories

More for Developers

RSS Feeds

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