Calling c method from java with jniwrapper

Hello
Does anyone have any good example or links to j�niwrapper method.
I have checked documentation www.jniwrapper.com. However i think I would need a clear example or example code on how to call an c function from javaprogram.
Please help!
Regards Land�

Does jniwrapper work with MIDP 2 on the devices that have kvm..?

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How to Call C++ Method from Java

I need to call C++ method from Java.
I have gone through the JNI tuorial , but was not able to pin point things.
I read that :
You have to write JNI c functions which then call your C++ member functions.You need to write a JNI function which will call new on your C++ class.
Now i have java class :
Java Code JavaClass.java ---->
class JavaClass{
public native void nativeMethod();
    static
        System.loadLibrary("NativeCppCode");
     private void callCppMethod()
          //call C++ method
                JavaClass jvc = new JavaClass();
                jvc.nativeMethod()
}Cpp Code:
NativeCppCode.h---->
class NativeCppCode
public:
    getValue();
    setValue();
private:
   int a;
JNIEXPORT void JNICALL Java_JavaClass_nativeMethod(JNIEnv *env
               ,jobject obj);NativeCppCode.C---->
NativeCppCode::getValue()
   return a;
NativeCppCode::setValue()
   a = 1;
JNIEXPORT void JNICALL Java_JavaClass_nativeMethod(JNIEnv *env
               ,jobject obj)
NativeCppCode* nativeInstabce = new NativeCppCode();
NativeCppCode.setValue();
}Is this the correct way to do it.
Any suggestion would be a great help to me

tryit wrote:
I need to call C++ method from Java.Not possible.
JNI uses C methods.
Is this the correct way to do it.Same way you would do it in any C/C++ method (not java)
       MyClass* p = ....
       p->doit();
Common idiom for the pointer in the above is to pass it back and forth to your java code as a java long. You cast it it and from your class pointer. Provide an explicit java method to free it when done. Besides providing the explicit method also implement a finalizer to free it as well (however that is a fail safe and should not be relied upon.)

Calling javascript method from java

Hi this is sri,
I have one doubt on Java Applets "how to call the javascript method from java Applet".Can u give me the complete sample code for one program(both java applet file and html file also)because i can easily understand the programming flow.
Thanks ,
Srilekha.

It's an extremely important skill to learn how to search the web. Not only will it increase your research and development talents, it will also save you from asking questions that have already been answered numerous times before. By doing a little research before you ask a question, you'll show that you're willing to work and learn without needing to have your hand held the entire time; a quality that is seemingly rare but much appreciated by the volunteers who are willing to help you.
If you've done the research, found nothing useful, and decide to post your question, it's a great idea to tell us that you've already searched (and what methodologies you used to do your research). That way, we don't refer you back to something you've already seen.
To get you started, here's a link...
http://www.google.com/search?q=call+java+from+javascript

Calling C++ method from Java program on Linux

I'm trying to get set up to call a C++ method from a Java app on a SUSE Linux box. I follow the steps of the "Hello World" baby example in Beth Stearns's tutorial, "Integrating Native Code and Java Programs", but I get the following error message:
Exception in thread "main" java.lang.UnsatisfiedLinkError: /users/dmizell/testIF/libhello.so: /users/dmizell/testIF/libhello.so: invalid ELF header (Possible cause: endianness mismatch)
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1778)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1703)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1028)
at HelloWorld.<clinit>(HW.java:7)
at Main.main(Main.java:5)
Any idea what I might be doing wrong?
thanks
David

Your library is compiled in a way which is incompatible with the VM you are using.
Note that there is a JNI forum.

Calling c method from java

Hi,
I am new to JNI. I want to call a C function from java, where my C function name is
UINT8 abc(UINT8 feature, UINT8* in_value, UINT32 serialNo, UINT8 * out_value)
where,
typedef unsigned char UINT8;
typedef unsigned int UINT32;
My question is what should be the prototype defination in java and what has to be changed in C code to make it work?

After adding the native keyword to your Java method, compile with javac and run javah on the class name. For example:
package my.stuff;
public class MyClass
   public native void myMethod(char param1, int param2);
}javac ./my/stuff/MyClass.java
javah my.stuff.MyClass
This generates my_stuff_MyClass.h, which has the function prototype for your method. Inside the implementation of the function, you can call your C function.
Here is the contents for my_stuff_MyClass.h:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class my_stuff_MyClass */
#ifndef _Included_my_stuff_MyClass
#define _Included_my_stuff_MyClass
#ifdef __cplusplus
extern "C" {
#endif
* Class:     my_stuff_MyClass
* Method:    myMethod
* Signature: (CI)V
JNIEXPORT void JNICALL Java_my_stuff_MyClass_myMethod
(JNIEnv *, jobject, jchar, jint);
#ifdef __cplusplus
#endif
#endif

Calling an application from java with cmd

hi there
the problem is that I need to call a windows application passing args (using cmd would be a good idea I think)
if you are familiar with C I just need a method in java that works like the function
system("progr args... ");any ideas?

Runtime.exec()i 've tried that but it doesn't seem to work as i
wanted
perhaps i need some more research!!!
thanks!!!!Did you read the article I posted? It is usually enough to get a good start.
Also, specifically what do you mean by "it doesn't seem to work"?

Call Javascript methods from Java methods

Dear All,
I have a requirement where I need to invoke Javascript methods from a Java file located in the same machine. Are there any possible solutions for this?
Regards,
Alok

Hi,
Thanks for all your replies. Does this work on Java 5 too? Could you please share the complete code snippet which makes it work? I tried working on yours but no success.
Regards,
Alok

Are DLL methods called as instance or static methods from Java ?

Hi,
I have only a small question.
When I call a C++ DLL method from Java using JNI, do I instantiate it like an object method or is it called as a static method ?
I am asking you this because I will use servlets (Java 1.2.2) to call a DLL. These servlets may run concurrently in any moment, and I pass some data to this DLL. I want to know if there is any possibility of this data becoming corrupt, because of one concurrent servlet rewriting the data another servlet has passed.
Thanks and regards.

The question is not specific enough.
Methods in C/C++ can be qualified with the following forms:
-global (C/C++)
-static member(C++ class method)
-instance member(C++ class method)
Since you didn't provide your code I couldn't possible determine which of the above you are using, but presumably you know.
On the other hand a java native method is either static or non-static depending on how you defined it in the class. Once again without the code there is no way to say and presumably you already know this.
The context of the methods is the same context that a similar servlet method has. But naturally in C/C++ is is easy to circumvent the context - for example by using a global variable.
Data in C/C++ can always become corrupt and in the vast (all?) cases it is because something is wrong in the C/C++ code. Like a pointer that is not initialized, or a pointer used after it is free'd. Or writing past the end of a buffer, or writing before the beginning of a buffer.

How to call backing bean method from java script

Hi,
I would like to know how to call backing bean method from java script.
I am aware of serverListener and [AjaxAutoSuggest article|http://www.oracle.com/technology/products/jdev/tips/mills/AjaxAutoSuggest/AjaxAutoSuggest.html]
but i am running in to some issues with [AjaxAutoSuggest article|http://www.oracle.com/technology/products/jdev/tips/mills/AjaxAutoSuggest/AjaxAutoSuggest.html]
regarding which i asked for help in other thread with subject ....Question on AjaxAutoSuggest article (Ajax Transactions Using ADF and J...)
The reason why i posted is ( though i realise both are duplicates) .. that threads looks as a specific question to that article hence i would like to ask the quantified problem is asked in this thread.
So could any please letme know how to call backing bean method from java script
Thanks
Murali
Edited by: mchepuri on Oct 24, 2009 6:17 PM
Edited by: mchepuri on Oct 24, 2009 6:20 PM

Hello,
May know how to submit a button autoamtically on onload of page with clicking a welcome alert box. the submit button has managed button too to show a message on console using SOP.
the problem is.
1. before loading the page a javascript comes on which i clicked ok
2. the page gets loaded and the button is there which gets automatically clicked and the managed bean associated with prints a message on console using SOP.
I m trying to do this through server listener and click listener. the code is(adf jspx page)
<?xml version='1.0' encoding='UTF-8'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
<jsp:directive.page contentType="text/html;charset=UTF-8"/>
<f:view>
<af:document id="d1" binding="#{backingBeanScope.backing_check4.d1}">
<af:form id="f1" binding="#{backingBeanScope.backing_check4.f1}">
<af:commandButton text="commandButton 1"
binding="#{backingBeanScope.backing_check4.cb1}"
id="cb1" action="#{beanCheck4.submit1}"/>
<af:clientListener type="click" method="delRow"/>
<af:serverListener type= "jsServerListener"
method="#{backingBeanScope.backing_check4.submit1}"/>
<f:facet name="metaContainer">
<af:resource type ="javascript">
x=confirm("hi");
// if(x){
delRow = function(event){
AdfCustomEvent.queue(event.getSource(), "jsServerListener", {}, false);
return true;
</af:resource>
</f:facet>
</af:form>
</af:document>
</f:view>

</jsp:root>
the backing bean code is -----
public class classCheck4 {
public classCheck4() {
public String submit1() {
System.out.println("hello");
return null;
}

Calling OCX Methods from a Java Program

Hi All,
Is it possible to call OCX methods from a Java program? If yes, can you please refer me to any documents or sample code to achieve this.
All inputs are highly appreciated.
Thanks
Tarek

JNI
http://java.sun.com/docs/books/tutorial/native1.1/index.html

Calling a method from another class or accessing a component from another

Hi all
im trying to make a find/replace dialog box
my main application form has a jtextpane and when i open up the find and replace dialog box it has two textboxes (find and replace)
now i have the code to do the finding on my jtextpane but how do i call that code to do the find method?
I have tried having the code in my main application class but then how do i call that method from my dialog box class?
ive also tried having the code in my dialog box class, but then how to i tell it to work on my jtextpane which is in my main ap class?

well if someone had been nice enough to provide me
with a tutorial i wouldnt have gotten into this
muddle, no need to be rude is there!I'm not rude. And you also wouldn't have gotten into the muddle if you searched yourself. This site provides many very good tutorials about all kinds of stuff.
http://java.sun.com/docs/books/tutorial/java/javaOO/classes.htmlAmong other things, it mentions that "static" defines everything that belongs to a class, as opposed to an object.

Curious thing while calling a procedure from Java !...

Hi !. My name is Agustin and my doubt would be the following one... I am working for a e-business comp and they asked me to call a procedure from java... The code is the following one:
CallableStatement cs = null;
System.out.println("Fecha Nro. 1: " + paramFechaDesde);
System.out.println("Fecha Nro. 2: " + paramFechaHasta);
try
cs = getDBTransaction().createCallableStatement("{call paq_w_ListadoSiniestralidadART. p_sinsiniest(?,?,?,?) }",0);
cs.registerOutParameter(4,OracleTypes.VARCHAR);
cs.setInt(1,paramContrato.intValue());
cs.setString(2,paramFechaDesde);
cs.setString(3,paramFechaHasta);
cs.setString(4,paramNombreArchivo);
cs.executeQuery();
String nomArchivo = cs.getString(4);
System.out.println("### " + nomArchivo +" ###");
catch(SQLException e)
The weird thing is that, I was expecting a big big exception but the only thing I got is
### Error ###
The String I am expecting is a file's name !; so I am a little bit confused...
Also I didn't know where to post so If it's in the wrong category... I apologize !... If anyone need more details, I'll be checking out... The account I am working on is an Insurance company, who is the one who provide access to the DB and the procedures... So I can't check what's inside...

Please provide your Java and OS versions, the JDBC jar file and the Oracle DB version being used when you post.
>
I was expecting a big big exception
>
Then why do you have an empty exception block? That just makes it disappear so you won't see one if it happens.
And your code has
cs.registerOutParameter(4,OracleTypes.VARCHAR);
cs.setString(4,paramNombreArchivo);You use 'registerOutParameter' for an OUT parameter and the 'setXXX' methods for other parameters.
Remove the 'setSTring' for the OUT parameter.
Then as malcollmmc already said
>
Sounds like the PL/SQL is returning "Error" as the 4th parameter of the call
>
The actual value returned by PL/SQL is strictly determined by the PL/SQL code and Java and JDBC are not involved.
Fix the code problems, retest, and folllowup with whoever wrote the code if it still returns ERROR.

Calling an EJB from Java Mappings in PI 7.1

In my operation mapping, I am using a Java class which in turn invokes an EJB using JNDI lookup.
When I execute the code, the class is successfully finding the EJB using JNDI, but invoking it I am getting a java.lang.NoClassDefFoundError.
If, I add the class it cannot find to the jar containing the Java mapping class, I get a java.lang.ClassCastException.
Has anyone been able to call a custom EJB from with a Java Mapping class?
Any help appreciated.
Thanks.

Hello.
Check my wiki article:
http://wiki.sdn.sap.com/wiki/display/stage/SapNetweaverProcessIntegration.CallEjb3.0methodfromJavaclassmappingPI7.1
(SapNetweaver Process Integration. Call Ejb 3.0 method from Java class mapping PI 7.1 )
Greedings

I wants to call .Exe file from Java Programme

I wants to call .Exe file from Java programme. Please give answer with example. This very urgent. Help me

hi
u can use Runtime.exec() method in java.lang package
to execute exe files
regards
pnp

Help: Calling C++ method in Java source code?

I found a method very useful, but it is written in C++, really hate to translate it into Java. My questions are:
1. Is it possible to call it in my java source code?
2. If so, how to call the C++ method in my Java program?

To answer your first question, yes it is possible to call your C++ method from Java. There are several answers to your second question, however. You can use the raw procedural JNI and code your own layer that maps your Java proxy object instances to C++ peer instances. Another option is to generate the code for that mapping automatically. How? Download JNI++ (http://jnipp.sf.net or http://www.sf.net/projects/jnipp). JNI++ is a free, open-source toolkit that makes easy work of bi-directional Java <---> C++ integration -- it will even generate your makefile. Comes complete with a 100-page printable PDF User Guide and plenty of examples to get you started.
Good luck with your project.
I found a method very useful, but it is written in
C++, really hate to translate it into Java. My
questions are:
1. Is it possible to call it in my java source code?
2. If so, how to call the C++ method in my Java
program?

Calling c method from java with jniwrapper

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