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Just catching an exception from UNMANAGED code, you are going to lose information.<br />
<br />
Here<br />
&nbsp; &nbsp; <a href="http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/0624f3b3-5244-4cb8-be9c-29d464975d20/" rel="ugc nofollow">http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/0624f3b3-5244-4cb8-be9c-29d464975d20/</a><br />
they show (at the bottom) how to generate a wrapper that translates an exception (in their case, a string exception, but the unsigned would be similar).
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Just catching an exception from UNMANAGED code, you are going to lose information.

Here
    http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/0624f3b3-5244-4cb8-be9c-29d464975d20/ [http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/0624f3b3-5244-4cb8-be9c-29d464975d20/]
they show (at the bottom) how to generate a wrapper that translates an exception (in their case, a string exception, but the unsigned would be similar).

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thanks...<br />
but this hint requires compilation using /clr option.<br />
this is something I need to avoid.<br />
unfortunately...
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thanks...
but this hint requires compilation using /clr option.
this is something I need to avoid.
unfortunately...

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This is not the answer for my question but this is exactly how to solve my problem:-)<br />
Thanks for those ideas...
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This is not the answer for my question but this is exactly how to solve my problem:-)
Thanks for those ideas...

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I need to throw a custom exception in C++ DLL and catch it for further processing in C# code using this DLL. I need to pass a simple STRUCT having few unsigned int member variables. How to manage that?<br />
Of course, I have access to both source codes, C++ and C#, as well...
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I need to throw a custom exception in C++ DLL and catch it for further processing in C# code using this DLL. I need to pass a simple STRUCT having few unsigned int member variables. How to manage that?
Of course, I have access to both source codes, C++ and C#, as well...

HowTo throw custom C++ Exception and catch it in C# ?

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.

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).