<div>
I added them, it didn' t fix the problem.
</div>


<div>
Also, when I don't have the header in there, I can't access the objects in the class that is causing the problems, so I don't think I have multiple inclusion problems. &nbsp;I think it has something to do with the fact that they are all in the COM class perhaps? the .h file is creating global objects. &nbsp;just a thought. &nbsp;
</div>


<div>
This _usually_ fixes the problem you described. Are you sure the #ifndef/#endif part encloses *all* of your file? Could you post the code?
</div>


<div>
&gt;its all in the .H file, there is no cpp file<br />
You have to split them on cpp and h.<br />
There is no good way to solve the problem, if you have a code in your H file not only headers.
</div>


<div>
Other way:<br />
<br />
---myh.h---<br />
void SomeFunc(void);<br />
<br />
#ifndef CODE_ALREADY_DEFINED<br />
void SomeFunc(void)<br />
{<br />
}<br />
#endif<br />
--------------<br />
<br />
---file1.cpp---<br />
#include &quot;myh.h&quot;<br />
----------------<br />
<br />
---file2.cpp---<br />
#define CODE_ALREADY_DEFINED<br />
#include &quot;myh.h&quot;<br />
----------------<br />
<br />
---file3.cpp---<br />
#define CODE_ALREADY_DEFINED<br />
#include &quot;myh.h&quot;<br />
----------------<br />
<br />
...
</div>


<div>
<div class="content wysiwyg-content">
I have a COM dll I am writing with 4 different interfaces / classes. &nbsp;I have some classes, structs and globals defined in a .H file (its all in the .H file, there is no cpp file)<br />
<br />
When I include the .H file in one of the headers for the 4 classes, I have no problem.<br />
<br />
When I include the .H file in two of the headers for the 4 classes, I get all sorts of <br />
<br />
SYMBOLICFucntionName already definien in Object2.obj, where Object2 is the second object I added the #include directive to. &nbsp;There are no errors for Object1, the original object that #included my header with objects and enums. &nbsp;<br />
<br />
Am I not allowed to do this? &nbsp;If not, how do I restrucutre the linking/files so that I can do something like this? &nbsp;<br />
If so, why is this not working?
</div>
</div>


I have a COM dll I am writing with 4 different interfaces / classes.  I have some classes, structs and globals defined in a .H file (its all in the .H file, there is no cpp file)

When I include the .H file in one of the headers for the 4 classes, I have no problem.

When I include the .H file in two of the headers for the 4 classes, I get all sorts of 

SYMBOLICFucntionName already definien in Object2.obj, where Object2 is the second object I added the #include directive to.  There are no errors for Object1, the original object that #included my header with objects and enums.  

Am I not allowed to do this?  If not, how do I restrucutre the linking/files so that I can do something like this?  
If so, why is this not working?

URGENT:  Header Files / Linking Problem

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.