C-based DLL with P/Invoke

[fyderniX]

Hey;

First things first: I'm an ignorant student and have no clue what I'm
doing.

I'm trying to compile the open source fitz/muPDF library (C) used in
the Sumatra PDF Viewer (http://blog.kowalczyk.info/software/
sumatrapdf/) into a dll for use via P/Invoke (C#).

I'm using Visual C++ Express 2005. Everything seemed to work
fine,
and the plethora of .c and .h files compiled/linked with the following
options:

/Od /I "c:\Documents and Settings\eric\Desktop\AUCAS\AUCAS
\sumatra-06March2007\fitz\include" /I "c:\Documents and Settings\eric
\Desktop\AUCAS\AUCAS\sumatra-06March2007\ext\jpeg" /I "c:\Documents
and Settings\eric\Desktop\AUCAS\AUCAS\sumatra-06March2007\ext\zlib" /I
"c:\Documents and Settings\eric\Desktop\AUCAS\AUCAS
\sumatra-06March2007\ext\freetype231\include" /D "_WIN32" /D "WIN32" /
D "_WINDOWS" /D "_DEBUG" /D "DEBUG" /D "NEED_MATH=1" /D
"NEED_STRLCPY=1" /D "NEED_STRSEP=1" /D "_MBCS" /Gm /RTC1 /MTd /GR- /
Fo"Debug-fitz\\" /Fd"C:\Documents and Settings\eric\Desktop\AUCAS
\AUCAS
\sumatra-06March2007\Debug-fitz\fitzlib_d.pdb" /W3 /nologo /c /ZI /
TC /
wd4996 /wd4244 /wd4267 /wd4995 /FC /errorReport:prompt

However, when I try to call functions from the dll, the library is
loaded but the function is never found. Running 'Dumpbin.exe /
EXPORTS' on it shows a very short output and no method names.

Any help, or at least pointers to someplace which might help get me
started? Google never yields much on intermediate programming topics.

SigmaX