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The EntryPoint field of the DllImport attribute can be used to import functions by ordinal (prefix the ordinal with a #).
It can also be used to import functions by their mangled name.
If you really have pure "extern C" wrappers for all of the functionality exposed by the C++ library, that makes this easy.
If you do not, you can construct C++/CLI wrappers to bridge between managed and unmanaged.

undname.exe in the vc\bin folder can be used to demangle compiled C++ names:

class inxight::summarization_interface * __cdecl inxight::make_summarization(
   class inxight::summarizer_interface &,
   class inxight::byte_stream_interface &,
   class inxight::summarization_input_options const &,
   class inxight::summarization_sentence_output const &, 
   class inxight::summarization_phrase_output const &,
   char const *, unsigned int , char const *)

andras 2010-04-07 13:53:13

OK, I see that the whole mess at ordinal 3 is the last function I call for this functionality and that what I thought were other functions are the parameters, which are all class objects. The first parameter I can construct (and have done so) because it's constructor is exported as ordinal 4 (it works fine using ordinal or mangled name). How do I get at the other constructors? They are available in C. Am I stuck?How does JNI make them visible? Is it how the dll is loaded?

Jim Jones 2010-04-07 14:42:02

@Jim: probably the cleanest way to do this is to create a C++/CLI library to wrap the native functionality. This is - kind of - similar to what you have to do with JNI (in that you can work in native (unmanaged) code and expose objects/functions to the managed world.)

andras 2010-04-07 14:50:28

Any good references as to how this is done?

Jim Jones 2010-04-07 14:55:24

@Jim: Hmmm. I was just searching. Found a few, but this one seems to be the most useful (subjectively): http://www.sharpoblunto.com/News/2007/09/16/the-trip-to-c2b2bcli-with-unexpected-results

andras 2010-04-07 14:59:08

OK thanks much for your time.

Jim Jones 2010-04-07 15:04:56

@Jim: Another, in case you do not have the necessary import headers for the library. It gets tedious and IMHO fragile, though: http://entribute.com/usingcppdll.htm

andras 2010-04-07 15:52:41

Thanks, will read in case I get in that situation. Now however, I do have headers, documentation, full binary SDK.Jim

Jim Jones 2010-04-07 19:55:08

@Jim: If you ever need to make it portable (i.e. to run on Mono), you are better off creating a C wrapper and consuming that through P/Invoke. (Mono is not working and will probably not work even in the distant future with C++/CLI.)

andras 2010-04-09 11:24:51

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