[TUTORIAL+KB] How to create an EML export mechanism in GW8

Question

Hello there folks!
I'm pretty new to the topic of C3PO, GW and all the Novell stuff and one of my tasks was to "code an export mechanism for GW8 thats lats us save e-mails to our storage system". Ok, that was a hammer. But wrapping my head around it and starting to error out the things got me pretty far and I guessed it was tutorial material. So here we go:
@Moderators: Please don't delete this. I need some time to wrap it all up.
This tutorial is intendend for C# only. I don't like VB and I'm too dumb for C++ so if you need it for another dialect you need to work it out your self.
Agenda:
Needed packages
C3PO wizard
Loading to Visual Studio 2010
Needed Imports/References
Simple MessageBoxing
Get Messages and stuff them into Lists
Export single Messages
Export multiple messages
Registering and caching the .DLL
Testing (please help me with a better way here)
1. Needed packages
the novell-gwc3po-devel-2012.11.15.zip file (unzip this after downloading)
an installed version of Visual Studio 2012 C# (or if you want to work with a different dialect choose another)
cmd access to some of the registering tools:
It may be the best thing to set tose paths up in you env variables. Allthough when running the cmd with administrator privileges you can't use regasm from env variables and need to cd to the directory.
RegAsm (regasm.exe): C:\Windows\Microsoft.NET\Framework\v4.0.30319 (the version depends on the target)
GACUtil (gacutil.exe): C:\Program Files(x86)\Micrsoft SDKs\Windows\v7.0A\Bin\NETFX 4.0 Tools\ (this path is also dependent on your target framework version, I chose .NET4)
StrongName (sn.exe): C:\Program Files(x86)\Micrsoft SDKs\Windows\v7.0A\Bin\NETFX 4.0 Tools\ (this path is also dependent on your target framework version, I chose .NET4)
a good beverage :D (you should obtain multiple of these :D)
2. The C3PO wizard
Loading to Visual Studio 2010
Needed Imports/References
Simple MessageBoxing
Get Messages and stuff them into Lists
Export single Messages
Export multiple messages
Registering and caching the .DLL
Testing (please help me with a better way here)

Answer 1

 can see it in the screenshot8 there is a function called "_Z8AddierenddPd" instead of "Addieren". I copied this name to Labview (see screenshot9) and it worked.
I'm sure that there is a way to compile the shared folder with gcc without decorations (mangling). But I don't know how. If someone has a recommendation I would be very glad!
Prepend each function declaration that you want to be available without name decoration with
extern "C" <your function declaration>
Or if you have multiple functions you want to export you can in the header file where you declare your functions simply use:
#ifdef __cplusplus
extern "C" {
#endif
<all your function declarations>
#ifdef __cplusplus
#endif
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions