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Try 
 
template &lt;class T&gt; class DllExport ntfNotificationServer {...} 
 
class ivDLLEXPORT imageView : public CView, public 
ivNotificationServer 
{...} 
 
I assume you are indicating what type that ntfNotificationServer shoudl be expanded for in ImageView. &nbsp;Right? &nbsp;If not that is a problem. 

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Try

template <class T> class DllExport ntfNotificationServer {...}

class ivDLLEXPORT imageView : public CView, public
ivNotificationServer
{...}

I assume you are indicating what type that ntfNotificationServer shoudl be expanded for in ImageView.  Right?  If not that is a problem.

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Hi, 
 
&nbsp; Does anyone know how I can get rid of this warning: 
 
warning C4275: non dll-interface class 'ntfNotificationServer&lt;enum ivNOTIFY_TYPE&gt;' used as base for dll-interface class 'imageView' 
 
The problem that I'm having is that the base class is a template class defined in a separate header file with no linkage specification: 
 
template &lt;class T&gt; class ntfNotificationServer {...} 
 
And used as a base for a class exported by the dll: 
 
class ivDLLEXPORT imageView : public CView, public ivNotificationServer 
{...} 
 
ivDLLEXPORT is just a macro used to control dllimport/dllexport for .h &amp;&nbsp;.cpp files. 
 
I get the same warning from CView, but I can get rid of this one by predeclaring it like so: 
 
class __declspec(dllimport) CView; 
 
Unfortunately, if I do this for the template class, I have problems with inconsistant linkage for the member functions. 
 
Thanks for any help, 
Jerry
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</div>

Hi,

 Does anyone know how I can get rid of this warning:

warning C4275: non dll-interface class 'ntfNotificationServer<enum ivNOTIFY_TYPE>' used as base for dll-interface class 'imageView'

The problem that I'm having is that the base class is a template class defined in a separate header file with no linkage specification:

template <class T> class ntfNotificationServer {...}

And used as a base for a class exported by the dll:

class ivDLLEXPORT imageView : public CView, public ivNotificationServer
{...}

ivDLLEXPORT is just a macro used to control dllimport/dllexport for .h & .cpp files.

I get the same warning from CView, but I can get rid of this one by predeclaring it like so:

class __declspec(dllimport) CView;

Unfortunately, if I do this for the template class, I have problems with inconsistant linkage for the member functions.

Thanks for any help,
Jerry

Problem with template classes in DLLs

C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.