How to call Function from an C# dll in Java?

Question

i have a SAP-DLL to enable communication between a Programming interface and the SAP Programm.

I have following example Code for c# in combination with the dll-File:

var loggerService = LoggerService.GetLoggerService("FileLogger");
var itasProxy = SapProxyFactory.CreateSapProxy(SapSystem.Example, loggerService, "Example_User", StringExtension.CreateSecureString("Example_Password")); 
var funcResult = sapProxy.SearchSapAddress(clientNo);

if (funcResult.Successfull)
{
    funcResult.ReturnValue = withFormatting
        ? AddressFormatter.SplitStreetHouseNo(funcResult.ReturnValue)
        : funcResult.ReturnValue;
}

Now i want the same functionality to be transferred to java. I have absolutely no clue how to do that. I tried the following with Loggerservice as a starter, but it doesn't work:

public class SAPConnector {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        connectSAP();
    }
    public void connectSAP()
    {
        System.load("C://Temp//SapConnector.dll");
        Object loggerService = getLoggerService("FileLogger");
    }
    public native Object getLoggerService(String lcLogger);
}

i just need some kind of information how to call the Functions from the dll or an example how to transfer the C# Code to working Code in Java.

Greetings,

Kevin

@john: no it isn't the thread you posted is based on an entirely different dll-Problem — Kevin Barz
– Kevin Barz, Commented Dec 15, 2017 at 8:11
Fine, I'll delete my duplicate suggestions. You are, however, looking for a way to call C# code from Java, are you not? If that is not the case, you should re-word your question. — ProgrammingLlama
– ProgrammingLlama, Commented Dec 15, 2017 at 8:13
I can´t see what those two snippets have in common. From my opinion they are completely different. Anyway when you write "doesn´t work", what does that mean? Show exactlx what you´ve tried and what problems you got on doing so. This includes your current cide and every error/exception/unexpected behaviour/unexpected results you get. — MakePeaceGreatAgain
– MakePeaceGreatAgain, Commented Dec 15, 2017 at 8:16
yes, i am, but you have to read my text. It is a special case, i already tried several things that i read at stackoverflow, nothing work, because i can't get the right syntax for the native support. My dll uses it's own classes and data types and i have no idea how to get java to recognize these functions and data types, i just need one example from my code i posted so that i can find a solution — Kevin Barz
– Kevin Barz, Commented Dec 15, 2017 at 8:17
@HimBromBeere with the code i have now i get the error UnsatisfiedClassLink on the line 10 in my java code.... and like i said, the first snippet is the working c# Code in combination with the dll, now i need that same code with same functionality to be working in java :) — Kevin Barz
– Kevin Barz, Commented Dec 15, 2017 at 8:19

Yoav Gur · Accepted Answer · 2017-12-15 10:02:17Z

3

DLL is Microsoft format. Java is cross-platform, thus can't acknowledge anything operating-system specific, such as DLL.

One way around that is to use JNI (Java Native Interface), but that's usually not a good solution, as it makes your program platform-dependent.

Instead, I would look for a JAR from SAP, that provides a similar interface. Maybe something along SAP JCO.

You can see some actual code examples using JCO here, and some technical information on step-by-step download and configure here.

edited Dec 15, 2017 at 10:02

answered Dec 15, 2017 at 8:17

Yoav Gur

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10 Comments

Kevin Barz Over a year ago

thanks for the comment, i already searched for it, but for now i have to get this working... like you saw, i tried JNI, but i think i made a mistake or forgot something, it's the first time i use it ...another solution i had in mind is make the code with vbs and call the vbs script from java, but that's not a good solution as well...

MakePeaceGreatAgain Over a year ago

Although Java is plattform-independent - as .NET also (see stackoverflow.com/questions/3656721/is-net-platform-independent) - this doesn´t mean every java-code can be run on any OS. There exist many such programs that only run on windows-machines. Having said this JNI is exactly what OP needs and calling a .NET-assembly from JAVA is absolutely okay.

Kevin Barz Over a year ago

@HimBromBeere is my syntax ok? or did i miss something to get this working?

Yoav Gur Over a year ago

Yeah, well, I agree it is very much dependent on your business scenario. I would be very surprised if SAP don't supply the same thing in a JAR, though. They are more Java-Oriented than many other companies. @KevinBarz if you do go with JNI, maybe the Tutorial in the link can help you. Did you follow the same steps?

Kevin Barz Over a year ago

@YoavGur i already tried several things, that's why i was looking for an answer, but i will try again with your tutorial

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