Execute dll function using Java Technology

Can I use Java to execute an existing dll function? Currently this dll function is sits in Unix and was compiled using Borland C compiler. How can this to be done?

If you know all the entry ponts to the dll, and their parameters, return values and caling conventions then you should be able to write 'c' funtion prototype for them like this
stdcall int somefunc(int x, char *x);
If so, you can load the dll (on windows) with LoadModule
get each functions address with GetProcAddress
and cast the result to a pointer to the appropriate prototype
THEN you can write a JNI wrapper dll that makes these functions available from JAVA

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Calling DLL function using LabVIEW 7.1?

Here's the scinario:
I have LabVIEW 7.1 and i'm trying to call a DLL function using 'CALL LIBRARY FUNCTION NODE'.
I have used this in the past with no problem. But right now, when I use this node and link it to the
library and function name, i get 'ERROR loading Dllname.dll' message.
NOTE that the DLL is generated using VStudio2003 or VStudio.NET. Could this be a problem??
Also, i noticed that there are some JUNK characters before & after the function name that show
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long ?EcpvsSign@@YAHHPBEH0HPAE1@Z(long Signer, CStr NonRMsg, long NonRMsgLen,
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tbd wrote:
Hi rkpat,
You might check-out this thread on building WIN32 DLLs - expecially the bit re: "mangles names" under the paragraph titled "C Language Source File". My recollection is that 'extern "C"' directive in the header file for the DLL solved the name-mangling problem, but it's been a few years!
Cheers!
Message Edited by tbd on 03-01-2007 11:19 PM
tbd is right. You have to first disable name mangling as it creates all kind of troubles. Other issues might be that your Visual Studio 2003 or .Net edition links in dynamic runtime libraries that are not standard available on every Windows PC so that you need to redistribute the according runtime library installer together with your app for the DLL to be even loadable.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Execute MSIL code using JAVA

How can I execute MSIL code using java?

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Call DLL function from JAVA

HI!
What's the best way (and simple) to call DLL function from JAVA.
DLL function (developed in C) has two input parameters (string) and return an integer.
Could you help with an example?
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hi
I am trying to create a small utility in java that extracts data from SAP system and loads it to local Db
For extracting data from SAP we have a custom ABAP function (RFC) running on SAP server that is called from Java using JCO3 APIs
Installation of this utility on client side involves -
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Hi Amit
I am not sure I understand the question. You want to create an RFC in Java? If this is correct why not create a Remote Method in java for example as EJB or Web Service which is more standard than creating an RFC.
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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?
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http://java.sun.com/j2se/1.5.0/docs/guide/jni/spec/jniTOC.html

How to call the DLL functions through Java

Hello,
I have already got a VC++ generated DLL. It has serveral functionalities. I need to call those functions from my Java Application. Now i know that it can be possible only through writing Java JNI Interfaces.
Everywhere i only see they give an example where in they tell to create an DLL. Now how do i will call if an DLL is ready and exists.
If anyone can give an example then it will be very helpful to me. Please mail me at [email protected] .
Thank you
vvpatro

You can't call functions in an arbitary DLL form Java. You need to use JNI to produce a 'wrapper' DLL that maps Java methods to the methods in the target DLL. The purpose of the wrapper is to allow type conversion between Java types and C/C++ types. The complexity of this task depends largely on the types used in th target DLL. If the targer DLL uses only primitive types such as char, byte, int, long, string, the translation is simple and the wrapper DLL will be 'thin'. If however, the target DLL passes arrays and objects, or employs callbacks, these more work to do, and the wrapper will be correspondingly 'thicker'.
Hope this helps.

Execute unix command using java

Hello
Can we execute a unix command using java? If it is how we can execute. Is this affect the performance of the program.
Thanks

I tried what you said. But its not working and returning error message,
java.io.IOException: CreateProcess: ls -a error=2
     at java.lang.ProcessImpl.create(Native Method)
     at java.lang.ProcessImpl.<init>(Unknown Source)
     at java.lang.ProcessImpl.start(Unknown Source)
     at java.lang.ProcessBuilder.start(Unknown Source)
     at java.lang.Runtime.exec(Unknown Source)
     at java.lang.Runtime.exec(Unknown Source)
     at java.lang.Runtime.exec(Unknown Source)
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Runtime.getRuntime().exec("c\windows\notepad");
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Plz ...........

Delete command are not executed in function of Java Bean

Hello Sir,
In Java bean have a function submitData.I want in this function run delete command through PreparedStatement..But Its not executed.
Please review..
public void submitData()
try
System.out.println("Printed*************************************************************");
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Loading....");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@VijayKumar-PC:1521:XE","SYSTEM","SYSTEM");
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String User=getUserName();
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int y= st.executeUpdate();
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con.commit();
con.close();
System.out.println("Your Book are Submitted *****************");
catch(Exception e)
e.printStackTrace();
}Thanks.

Dear Sir,
I removed the singleaquotes from preparedstatement.But Its not executed in this function.Like:
public void submitData()
try
System.out.println("Printed*************************************************************");
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Loading....");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@VijayKumar-PC:1521:XE","SYSTEM","SYSTEM");
System.out.println("Connection created");
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String User=getUserName();
st.setString(1,User);
String Bname=getBookName();
st.setString(2,Bname);
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System.out.println(y);
System.out.println("Query Executed");
con.commit();
con.close();
System.out.println("Your Book are Submitted *****************");
catch(Exception e)
e.printStackTrace();
}Allthough Insert command is properly executed in another function of Java Bean.
Please review...
Thanks.

Making Executable Jar file using java Application

Following Program creates the jar file at specified location. but, I wonder why this file does not execute on double clicking on it, in spite of that the Manifest file contain correct main class file name
//MakJar.java
import java.io.*;
public class MakJar
public static void main(String[] args)throws IOException{
Process p;
String str="D:\\Himesh\\JFiles";
try {
BufferedWriter out = new BufferedWriter(new FileWriter(str+"\\mainClass.txt"));
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out.close();
} catch (IOException e) {
try
p=Runtime.getRuntime().exec("cmd /c D:\\Java6\\jdk1.6.0\\bin\\javac.exe "+str+"\\TestFrame.java");
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catch(IOException e)
System.err.println("Error on exec() method");
e.printStackTrace();
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Sir,
On execute the jar using a "java -jar. . ." command. it gives the error--
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On Extracting the files from jar file made by the java program,i found that the manifist file ( containing the name of main class) and t the class file are included in the jar file.
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Same thing happen if i use MS-DOS batch file.
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Calling Window's Dll Functions from Java

Hello Audience,
Is there a way to call Win32/64 based Dynamic-Link-Library functions from Java?
Thanks,
GenKabuki

Yes.
In general, if you are trying to call functions in an existing dll, you will have to write a "wrapper" dll that meets the java jni interface requires. There are tools around wich purport to generate these for you. Do a google serach; among other tools, you should turn up JACE.

Executing SQL Loader ----- Using Java & C!!!!!!!!!!!!!

Hello,
We r confirmed that to execute SQL Loader,
One need to write an External Routine.
So First Step itself need to create a
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Using Java.
How Can I execute the SQL Loader (.exe)
using Java?
How can I proceed? Waiting ASAP. Thankyou
Abhay
null

I have a nice piece of Java code that allows you to execute OS commands from within a PL/SQL block in Oracle. If you need the code send me an email. I know it works in Unix and it should work on most platforms.

Executing Jar Application using Java Programs

Hello there,
How can I run a java application using java programs.
Desc:
public class someapp {
public static void main(String[] ext) {
// How can I execute a jar application from here through java code
}

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How to execute ".exe" files using java

Hi,
This is guruvulu,
I have a problem in executing ".exe" files.For Example InternetExplorer.

Hi,
You can execute .exe files in JAVA using the following code.
Runtime rt1 = Runtime.getRuntime();
Process pc = rt1.exec("someexe.exe");
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Issue with Bookmark functionality (using java script) in WAD.

Hi,
I am working on a WAD report and instead of using the default bookmark functionality within WAD, i use a java code to get the bookmark url in a new window.
But the problem is the java code is not working consistently at all times.
Issue1: If i click on the bookmark button on the report for the first time, it will open up a new window with the bookmark link. But if i close that new bookmark url window and again click on the bookmark button, a new window is opened which displays the template corresponding to the bookmarkk generated earlier (the report in its executed form), instaed of the bookmark url.
Can anyone help me to correct this issue. At any time i click the bookmark button i want to get the bookmark url opened in the new window, instead of the template.
Issue2: The bookmark is not at all working at particular times. It will show error message at the bottom the page. What I am thinking is, this is because of the misalignment of the java code when you sava the WAD report. The java code is so sensitive that it gets realigned each time you save the WAD report. But sometimes even without making any changes also it is not working.
If anyone has any suggestion or inputs for solving these issues pleese help ASAP. The java code i used is given below.
function createBookmark()
var bwUrl="<SAP_BW_URL CMD='BOOKMARK'>";
child1=window.open(bwUrl,'win1','width=1,height=1,alwaysLowered=0');
window.focus();
//Ensure that BW completed generation of the bookmark url.
now = new Date();
startTime = now.getTime();
delayTime = 3000;
//Set timeout to 3 seconds
waitTime = startTime;
//check if the bookmark url is ready and timeout after the specified time (delayTime).
while (waitTime<(startTime+delayTime))
now = new Date();
waitTime = now.getTime();
//BW identifies a bookmark using BOOKMARK_ID. The presence of this string
//in the url is used to identify creation of the bookmark. If bookmark
//is created on the server, proceed to the next step.
if (child1.location.href.indexOf("BOOKMARK_ID") >0)
break;
bookmark_url = escape(child1.location.href);
bookmark_url = bookmark_url.replace(/%3A/g, ":");
bookmark_url = bookmark_url.replace(/%3F/g, "?");
bookmark_url = bookmark_url.replace(/%26/g, "&");
bookmark_url = bookmark_url.replace(/%3D/g, "=");
var base_url = window.location+"";
var base_index = base_url.indexOf("?");
base_index = base_index + 1;
var book_link = base_url.substring(0,base_index);
if (book_link.indexOf("sapdbi")!=-1)
book_link = "http://dep.xxx.com/sso/index.jsp?target=BW&";
if (book_link.indexOf("sapqbia1")!=-1)
book_link = "http://qep.xxx.com/sso/index.jsp?target=BW&";
if (book_link.indexOf("sapqbia2")!=-1)
book_link = "http://qep.xxx.com/sso/index.jsp?target=BW&";
if (book_link.indexOf("sappbia1")!=-1)
book_link = "https://portal.xxx.com/sso/index.jsp?target=BW&";
if (book_link.indexOf("sappbia2")!=-1)
book_link = "https://portal.xxx.com/sso/index.jsp?target=BW&";
if (book_link.indexOf("sapqbi")!=-1)
book_link = "http://qep.xxx.com/sso/index.jsp?target=BW&";
if (book_link.indexOf("sappbi")!=-1)
book_link = "https://portal.xxx.com/sso/index.jsp?target=BW&";
var book_index = bookmark_url.indexOf("?");
book_index = book_index + 1;
var book_length = bookmark_url.length;
var temp_link= bookmark_url.substring(book_index,book_length);
portal_bwUrl = book_link+temp_link;
child1.close();
// The below two lines are not necessary, it is left for reference.
// https://portal.xxx.com/sso/index.jsp?target=BW&SAP- //LANGUAGE=EN&language=EN&cmd=LDOC&TEMPLATE_ID=IPUWT_FRAME
bookmark_window=window.open("",'_blank','width=1000px,height=30px,status=0');
bookmark_window.moveTo(50,500);
var body_tag = '<body leftmargin=3 topmargin=3 bgcolor=#cad4e3 class=&SAPBEXTbsBdyEdg&>';
var body_text ='<p><font face=Arial size=2>
This bookmark can be copied and pasted to Internet Explorer-Favourites, mail or other documents:
</p>';
bookmark_window.document.write('<title name="SAP_BW_TITLE_!IID_171">Bookmark</title>',body_text, body_tag, portal_bwUrl, '</body>');
Thanks in Advance.

Hi Danny
Thanks for the update
Hi Danny
Thanks for the update.
I can't find any code in the attachment.Its a Web Page.
Rightclick on webpage and View Source
Then i can find Code.
Still it is not working
Issues: Which object i have to replace with the URL in the code
Value = 'Weekly'
or
fun(WEEKLY REPORT)
and
when i paste that code in the XHTML tab of template and tried to save it,The scripted is changed
Please update how to proceed
Thanks

Execute dll function using Java Technology

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