sharing constants and variables between dll and exe

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I am writing a program that consists of 3 parts, the main dll, an .exe which runs as a service and a dll with common code and variables. The idea was that both the main dll and the exe call the common dll and share variables/constants. But it turns out they both open a seperate instance of the common dll, thus no sharing the variables. Is there a way to solve this and let them use a single instance of the common dll?
Thanks for any help

Mark

Posted 30-Aug-10 10:28am

Mark Oostveen

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Yusuf · Answer 1 · 2010-08-30T10:42:00

Solution 1

You can not share varibles across dlls. What you can do is, any data you want to share put it in external data storage area such as database, flat file.

Posted 30-Aug-10 10:42am

Yusuf

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Mark Oostveen 31-Aug-10 1:24am

All possible constants I have put already in a configuration file, which is for 99% of my program sufficient. The only thing is I have one component, a videosource, to which I assign a usb webcam. This videosource I want to share across the dll and exe by using the common dll, but since they each open their own instance the videosource is not shared and since most (all?) usb webcams allow only one client, I end up either in the exe or in the main dll with a not connecting player....

Yusuf 31-Aug-10 9:30am

OK then. One possible solution is to look for single instance DLL. They are relatively straight forward to do in C/C++, I am not sure about C#. You may want to look into it. Here is how you do for C/C++ - http://support.microsoft.com/default.aspx?scid=kb;en-us;109619

Chris Trelawny-Ross · Answer 2 · 2010-08-30T11:12:00

Solution 2

You tag your question with "C#", so I'll assume that when you say "DLL" you are implying ".Net assembly".

If that's the case, then any public static fields and/or properties, of public classes or structs, in the shared assemblies will be visible to any assemblies that reference them.

Posted 30-Aug-10 11:12am

Chris Trelawny-Ross

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Mark Oostveen 31-Aug-10 1:25am

no it is an actual dll I created, part of a server console. it indeed uses .net components, but in this case that doesn't matter. the videosource I tend to share is a public static field/property, but it appers not to be shared...