[Guide] Simple C# in Java

[Loc Nguyen]

I spent a day figuring out how to do this. Here's how I did it:

-MY TOOLS

/*
Win 7 x64 Pro
Java 1.7 x86
Visual Studio 2010 Ultimate
Eclipse
*/

-PREP

Must have Visual Studio. This guide uses Visual Studio 2010.
Must have .NET 4. Mind the framework version. For now use v4.0.30319.
Must have Java 1.5+. JAVA_HOME set correctly.
IDE of your choice. This guide uses Eclipse.
Download the jni4net binaries.

Also, a .NET-compiled DLL of your choice. Example:

-STEP 1

Extract from jni4net-0.8.8.0-bin.zip/

bin/proxygen.exe
bin/proxygen.exe.config
lib/jni4net.j-0.8.8.0.jar
(x86) lib/jni4net.n.w32.v40-0.8.8.0.dll or (x64) lib/jni4net.n.w64.v40-0.8.8.0.dll
lib/jni4net.n-0.8.8.0.dll

-STEP 2

Open Visual Studio Command Prompt.

Enter:

corflags c:\users\loc\desktop\proxygen.exe /32BIT+ /Force

Use the correct path above. proxygen.exe should now be modified.

-STEP 3

Ready DLL or JAR assembly to have proxies generated.

Open Command Prompt. See usage details:

usage: proxygen.exe path\to\<config>.xml
usage: proxygen.exe path\to\<library>.jar -wd work\directory -cp java\dependenci
es;comma\separated;classpath -dp .NET\dependencies;comma\separated;assemblies
usage: proxygen.exe path\to\<library>.dll -wd work\directory -cp java\dependenci
es;comma\separated;classpath -dp .NET\dependencies;comma\separated;assemblies

Example usage of proxygen.exe to generate .NET proxies for Java:

// Short example
c:\users\loc\desktop\proxygen.exe "c:\users\loc\desktop\testlibrary.dll" -wd "c:\users\loc\desktop"

// Crazy example with dependencies
desktop\proxygen.exe "C:\Users\Loc\Documents\Visual Studio 2010\Projects\hasuite\maplelib2\bin\Release\maplelib.dll" -wd "c:\users\loc\desktop" -cp "C:\Users\Loc\Documents\Visual Studio 2010\Projects\hasuite\maplelib2\bin\Release\naudio.dll"

Use correct paths above.

-STEP 4

Edit the newly generated build.cmd file.

Near the bottom, where there is

csc

replace with:

(x86)

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

(x64)

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe

Run build.cmd

-STEP 5

Set up your project pipeline in Eclipse by importing the above, somewhat like this:

-STEP 6

Add some code:

package com.skipper.test;

import java.io.File;

import java.io.IOException;

import testlibrary.Test;

import net.sf.jni4net.Bridge;

public class Program {

public static void main(String[] args) {

try {

Bridge.setVerbose(true);

Bridge.init();

Bridge.LoadAndRegisterAssemblyFrom(new File("testlibrary.j4n.dll"));

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Test test = new Test();

test.Hello();

test.Repeat("It works!");

}

}

-STEP (FINAL)

Run the Java application and profit.

loading core from C:/Users/Loc/Documents/_Java/Jni4NetTest/jni4net.n-0.8.8.0.dll

loading jni4net.n-0.8.8.0, Version=0.8.8.0, Culture=neutral, PublicKeyToken=134a23405600bab4 from C:\Users\Loc\Documents\_Java\Jni4NetTest\jni4net.n-0.8.8.0.dll

loaded jni4net.n-0.8.8.0, Version=0.8.8.0, Culture=neutral, PublicKeyToken=134a23405600bab4 from C:\Users\Loc\Documents\_Java\Jni4NetTest\jni4net.n-0.8.8.0.dll

Initialized jni4net core

core loaded from C:/Users/Loc/Documents/_Java/Jni4NetTest/jni4net.n-0.8.8.0.dll

clr.version         :v4.0.30319

clr.arch            :32bit

java.home           :C:\Program Files (x86)\Java\jre7

java.version        :1.7.0_65

sun.arch.data.model :32

loading testlibrary.j4n, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null from C:\Users\Loc\Documents\_Java\Jni4NetTest\testlibrary.j4n.dll

loaded testlibrary.j4n, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null from C:\Users\Loc\Documents\_Java\Jni4NetTest\testlibrary.j4n.dll

Hello World, from C#!

It works!

[Pavel Šavara]

Hi Loc,

this is great stuff. Would you please contribute it to the wiki on gitHub ?

https://github.com/jni4net/jni4net/wiki

Thanks a lot

Pavel

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[Loc Nguyen]

Wiki was kickstarted. Talented github wiki writers and jni4net experts please contribute as well.

[Pavel Šavara]

I updated the web page to link to it, thanks again :-)

On Fri, Oct 31, 2014 at 2:15 AM, Loc Nguyen <locngu...@gmail.com> wrote:

Wiki was kickstarted. Talented github wiki writers and jni4net experts please contribute as well.

--

[dushkin]

Loc, Pavel,

 Thank you for your detailed walkthrough.

 However, I got some BadImageFormatException issue.

 It is detailed in a new post in the group.

 Would you kindly advise?

Thanks!

בתאריך יום חמישי, 30 באוקטובר 2014 בשעה 07:17:54 UTC+2, מאת Loc Nguyen: