Strange dumpbin export table

Am interoping a c++ dll and am attempting to access it's functions. Below is the dumpbin /exports output from the dll:

Dump of file C:\C#Processes\SummarizerApp\SummarizerApp\lib\summarizer37.dll
File Type: DLL
Section contains the following exports for summarizer37.dll

00000000 characteristics
458962FF time date stamp Wed Dec 20 11:21:19 2006
    0.00 version
       1 ordinal base
       4 n开发者_如何学编程umber of functions
       4 number of names

ordinal hint RVA      name

      1    0 00002960 ?delete_summarization@inxight@@YAXPAVsummarization_interface@1@@Z
      2    1 00016240 ?delete_summarizer@inxight@@YAXPAVsummarizer_interface@1@@Z
      3    2 000105E0 ?make_summarization@inxight@@YAPAVsummarization_interface@1@AAVsummarizer_interface@1@AAVbyte_stream_interface@1@ABVsummarization_input_options@1@ABVsummarization_sentence_output@1@ABVsummarization_phrase_output@1@PBDI5@Z
      4    3 0001BC40 ?make_summarizer@inxight@@YAPAVsummarizer_interface@1@PBD00@Z

Summary

    4000 .data
    B000 .rdata
    4000 .reloc
   2E000 .text

Take note of ordinal #3. It includes several methods I need to call, specifically:

make_summarization

summarization_input_options

summarization_sentence_output

summarization_phrase_output

Have done a JNI wrap of this dll and know that the functions above (which are all class contructors) are available from "extern C" which JNI uses, in unmangled form. Can I use the calling convention property of dllimport to access them undecorated?

In the C++ world what does it mean when multiple functions are exported under the same ordinal and what is the method of accessing them? Thanks, Jim

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 *)