This is a brief guide for integrating a Java-written model into C# source code.
For developing a model in C#, or rather the interface between the model and APSIM, see
Developing Models for APSIM.
Once you have the C# framework you'd need to do the following:
1. Convert the Java Bean into a COM object dll. See
ActiveX Bridge2. Use the COM object in the C# source code. See
Invoking COM Components from C#Tips from my personal experience: • ActiveX Bridge - VCVARS32.bat contents (in case you don't have it)
echo off
rem Root of Visual Developer Studio Common files.
set VSCommonDir=C:\PROGRA~1\MICROS~3\Common
rem
rem Root of Visual Developer Studio installed files.
rem
set MSDevDir=C:\PROGRA~1\MICROS~3\Common\msdev98
rem
rem Root of Visual C++ installed files.
rem
set MSVCDir=C:\PROGRA~1\MICROS~3\VC98
rem
rem VcOsDir is used to help create either a Windows 95 or Windows NT specific path.
rem
set VcOsDir=WIN95
if "%OS%" == "Windows_NT" set VcOsDir=WINNT
rem
echo Setting environment for using Microsoft Visual C++ tools.
rem
if "%OS%" == "Windows_NT" set PATH=%MSDevDir%\BIN;%MSVCDir%\BIN;%VSCommonDir%\TOOLS\%VcOsDir%;%VSCommonDir%\TOOLS;%PATH%
if "%OS%" == "" set PATH="%MSDevDir%\BIN";"%MSVCDir%\BIN";"%VSCommonDir%\TOOLS\%VcOsDir%";"%VSCommonDir%\TOOLS";"%windir%\SYSTEM";"%PATH%"
set INCLUDE=%MSVCDir%\ATL\INCLUDE;%MSVCDir%\INCLUDE;%MSVCDir%\MFC\INCLUDE;%INCLUDE%
set LIB=%MSVCDir%\LIB;%MSVCDir%\MFC\LIB;%LIB%
set VcOsDir=
set VSCommonDir=
• Invoking COM Components from C#
Early Bound Access to COM, as described in the article (2.) is great in the IDE. But when running it issued an error message which I couldn't sort out quickly. So eventually I reverted to the
Late Bound Access to COM which looks a bit more complex to write but works perfectly in run-rime.
• Events - Haven't dealt yet with passing events generated by the Java Bean through the C# wrapper. I'm not sure there is an elegant way of doing this. I imagine the "last resort" solution would be to poll the Java Bean for any happenings in
OnProcess() and generate required events in the C# code.
Hemda Levy
email: hemda.levy@dairynz.co.nz
