Using dll-files in Java

How can this be done?
Which classes should I use to do this?

JNI
http://java.sun.com/j2se/1.4.1/docs/guide/jni/index.html
- Chris

Similar Messages

  • Use .dll files in Java

    hi,
    i have a dll file thats present some function. i called DLL file from java . i got the some errors such as
    Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'USBIsConnected': The specified procedure could not be found.
    but I hope with in that DLL the function present. here i have used java 1.6 version . kindly give the ideas

    You need to have a good look at the JNI documentation.
    It isn't nearly as simple as you appear to think.

  • How to use DLL files in java?

    hi!
    i am working on hardware based java programming. the drivers which i have are in dll format. the manufacturers dont have a java based driver api's for the hardware. i want to invoke the dll file using a bridge between windows invironment and jvm invironment. more over i am not preferring to use native interface interface and c program to tackle this problem.
    is there a way out?

    Is it a COM dll? You could use JACOB. If it's not COM, there's also JNA which as I understand it, is simpler than JNI, although I've never used it
    Edited by: georgemc on Aug 22, 2008 11:05 AM links not working at moment for some reason
    Edited by: georgemc on Aug 22, 2008 11:10 AM

  • How to use a VB dll file in java

    hi,
    i am working on college project,In this output of calculation is not matching with college site .So any one can tell "how to use or combine a VB 'dll' file in java?".so that i can use VB 'dll' file in java to get right Output.
    If possible write code or send it to "[email protected]"
    Thanks
    Ravi kapani

    Did you try Google? And no, there is no native support for accessing .dll files from Java. That said, take a look at JNI.

  • How can I using functions implicit in dll file in java code ?

    How can I using functions implicit in dll file in java code ?
    I'm developing a program that interfacing with fingerprint hardware.
    I have the finger print already, and I have to the SDK that have all functions for managing this fingerprint.
    These SDK functions are represented in dll files.
    I want to know how can I use these functions in java code .
    I looked on this link of sun forums :
    http://forum.java.sun.com/thread.jspa?threadID=305171&messageID=1215613
    but I don't Understand the meaning of native code.
    Thanks for help.

    please please please please please please please please help me:
    After reading a lot of articles, tutorials, and overviews about JNI (Java Native Interface)
    I found that these steps
    1.     Develop the Java code
    2.     Compile the Java code to a class file
    3.     Generate the header file
    4.     Implement the native method
    5.     Create the shared library or DLL
    6.     Run the Java program
    Is the common steps in JNI development
    The most powerful link was
    http://java.sun.com/docs/books/jni/html/start.html
    and
    http://www.netbeans.org/kb/55/beginning-jni-part2.html
    and the pdf oh this link
    http://www.ibm.com/developerworks/edu/j-dw-javajni-i.html requiring IBM registration to download it.
    But I have already the DLL, and want to the stright forward way to use its functions by java code only.
    I don not to write any C++ code .
    Is this possible???????????????????????????????
    The name of these dll is �zkemsdk.dll�
    It developed by ZKSOFTWARE company for managing a finger print �NP1500A�of
    http://www.napcogulfsecurity.com/finger_print.asp
    thanks for help

  • Use .so file in java

    Hello friends...
    i have dont coding in java (windows based)
    no i want to use .so file in java...
    can i use it in java because c++ coding is done in linux and .so file is generated..
    So can i use directly .so file in java (windows based).
    Please give reply...
    thank...

    You can use a wrapper to call C methods in a DLL under windows or in a lib*so under *nix.
    There are many commercials products to do this : google for them.
    There is at least one LGPL product : jnative.
    Beware that most of those products do not work for C++ exported objects since they can't be "newed".
    BTW : If anybody knows how to new a C++ object by its name (like Class.forName()) : write me at http://sourceforge.net/projects/jnative
    --Marc                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

  • How can i import dll files in java project in eclipse?

    Hi All,
    How can i import or link dll files in java project in eclipse?....
    dll files contains
    import com.ms.com.ComLib;
    import com.ms.com.Variant;
    import com.ms.com.ComFailException;
    import com.ms.wfc.data.AdoException;
    import com.ms.wfc.data.AdoEnums;
    Any idea of this please tell me.....
    I am using eclipse 3.4 and JRE 1.4
    Is this possible?
    Please tell me!!!!!!!!!!!!!
    Voddapally

    iMovie cannot edit mpg files, unles they come directly from a supported camera.
    I would suggest that you use a free third party app to convert it.
    Get MPEG Streamclip from Squared 5, which is free.
    Drag you mpg clip into MPEG Streamclip.
    Then, FILE/EXPORT USING QUICKTIME
    Choose Apple Intermediate Codec, and save it where you can find it. You should be able to import this file into iMovie, using the FILE/IMPORT/MOVIE command.
    Note: If your file is an MPEG2 clip, you may need to purchase the Apple QuickTime MPEG2 Playback Component from Apple. MPEG Streamclip will tell you if you need this. Don't buy it unless you have to. It costs about $20. You just have to install the component. MPEG Streamclip will use it in the background.

  • How to call function in included dll file through java application.

    Hi All,
    i am trying to create an java application which call c# functions using JNI. i am completed with the code and it is running fine when i tried to run from netbeans IDE. But when i tried from Calculator.jar file, first time it throws this error:
    F:\JavaProjects\Calculator\dist>Java -jar Calculator.jar
    Exception in thread "main" java.lang.UnsatisfiedLinkError: no CSharpClient in java.library.path
    at java.lang.ClassLoader.loadLibrary(Unknown Source)
    at java.lang.Runtime.loadLibrary0(Unknown Source)
    at java.lang.System.loadLibrary(Unknown Source)
    at calculator.CalculatorApp.<clinit>(CalculatorApp.java:20)
    After that i included that dll file in the cuurent directory. And compiled and tried to run, it throws an unexpected error:
    F:\JavaProjects\Calculator\dist>Java -jar Calculator.jar
    *# An unexpected error has been detected by Java Runtime Environment:*
    *# Internal Error (0xe0434f4d), pid=2640, tid=3700*
    *# Java VM: Java HotSpot(TM) Client VM (1.6.0_02-b06 mixed mode, sharing)*
    *# Problematic frame:*
    *# C [kernel32.dll+0x12a5b]*
    *# An error report file with more information is saved as hs_err_pid2640.log*
    *# If you would like to submit a bug report, please visit:*
    *# http://java.sun.com/webapps/bugreport/crash.jsp*
    Anyone have idea how to solve this error.
    Thanks in advance.

    This error is created whenever things go sour on the native side. The first thing you can try, and I assume you are using a Java<->C++<->C# bridge which includes two dlls, one created by C++ and another by C#. Is to make sure that the C# dll is compiled using /t:module switch during compilation.
    If you are using VS2008, or VS2005, you can add a post build syntax like:
    csc /t:module /out:"$(ProjectDir)$(OutDir)YourModule.dll" "$(ProjectDir)YourCSfile.cs"
    Hope this helps! If not, ensure first that the native code works by creating a native test app for it.

  • How to use DLL file

    if i have a DLL file and i want to use them in my program
    is it possible to import them for example
    import Node.DLL
    or what , please tell me it's important for me

    You can use the DLL file by using System.loadLibrary().
    To use the functions in the DLL, you have to provide a JNI interface to it.
    Here's a good link to a tutorial.
    http://java.sun.com/docs/books/jni/html/start.html#769
    Budyanto

  • Accessing DLL files from Java

    I have a problem with Java, and the problem is that I'm trying to call a DLL file declared by C++ only but without a support for Java programs, is what I'm aiming for going to be available by using the rundll32.exe file.
    Note: I'm trying to use the (skydll.dll) file for controling skystar2 DVB card.
    Message was edited by:
    JZoro

    You cannot directly call a DLL from Java unless the DLL exposes entry points that are compatible with the JNI calling conventions.
    For example a Java class calling a native function like below:
    class Arguments
       private native void setArgs (String[] javaArgs);
       public static void main (String args[])
          Arguments A = new Arguments();
          newArgs[] = A.setArgs(args);
       static
          System.loadLibrary("MyArgs");
    }Needs a DLL entry point with the following signature:
    JNIEXPORT void JNICALL
    Java_Arguments_setArgs (JNIEnv *jenv, jobject job, jobjectArray oarr) {Notice that the first parameter of the method is of type JNIEnv and the second can be either a reference to a class or Java object instance.
    Jacques Gonzalez
    J4SOFT

  • Packaging dll files in java application

    Hi all,
    I am working on an application where I use some dll files from my java application. Now I would like to package the application so that end users can easily install and use them. the Java application is currently packaged as a jar file. How to i package the dll files? Where should I copy these files to on a target system.
    I tried packaging my application and installing it. But I get the following error: "Exception in thread "main" java.lang.UnsatisfiedLinkError". How do I resolve this error.
    Thanks for advance,
    Abdel

    Make sure that the dll files is in the library path.
    VM option example:
    -Djava.library.path=.\dll

  • Is it poosible to use .dll directly in java

    I had one .dll file ,i also knew the functions in that .dll .Now my doubt was is it poosible to use that .dll in my java application.If it is possible please help me on this issue.

    Yes, with a 3party tool.
    There are many commercials tools, google is your friend.
    There is (at least) one LGPL tool : jnative
    --Marc (http://jnative.sf.net)                                                                                                                                                                                                                                                                                                                           

  • How to access methods in existing dll file from java

    I have a dll file and that file contains two methods.
    Now I would like to access those two methods in java program.
    How to access these methods.
    Give me the sample code for this problem.

    http://forum.java.sun.com/thread.jspa?threadID=757125&tstart=0

  • Using .ocx file in java

    hi
    i have a ocx file and i want to call the functions in this ocx file from java.
    can anyone help me in using ocx functions in java program
    thanking you

    get freeware API (njawin11.zip) at http://simtel.net/pub/winnt/java/

  • How to Use DLL Function in Java Applet

    Hi all,
    I have been assigned a task to develop java applet. The problem is, I need to use DLL functions in my applet to read records. Could you pls anyone guide me how to interface DLL and applet to read records with sample code?
    I'm using JDK 1.5.0_06 and Windows XP OS. thanx..
    best rgds,
    jpdbay

    You will need to use Java Native Interface JNI. Ther are many posts on the subject, please search, and this is the documentation:
    http://java.sun.com/j2se/1.5.0/docs/guide/jni/spec/jniTOC.html

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