Using c files in a java code

i have a c util which i need to use in a java application do anyone has a clue?

check out the spec for JNI (java native interface)
You may save time tho just re-implementing in java

Similar Messages

How to use .properties files in Webdynpro Java code?

Hi all,
I want to use a logon.properties file when I initial a JCO connection pool in my webdynpro DC (JCO.addClientPool()),but I found when I deployed this DC to the server, it always giv e me an FileNotFoundException. So I donot know how to deploy a .properties file to the server and how to access this file in my Java code?
Thans and Best regards
Deyang

Hi,
1) put .properties file to your packege under src\packages folder (src\packages\com\sdn\properties\jco.properties)
2) load property:
     final InputStream is = getClass().getClassLoader().getResourceAsStream("com/sdn/properties/jco.properties");
     final Properties properties = new Properties();
     try
          properties.load(is);
     catch(Exception e)
          wdComponentAPI.getMessageManager().reportException(new WDNonFatalException(e), false);
Regatds Maxim R.

How to use Dlls and Header files in my java Code?

Hi All,
I want to make use of dll and header files of DataStage, from my Java Interface.
i am buliding a product where i need to contact DataStage server from my Java Code alone, For this they provided dlls and header files
Now i wan to make use of them and need to perform DataStage operations from my Java Interface.
Can any on help out me regarding this?

Try Java Platform SDK for native function calls without JNI writing code, like it done in .NET languages.
For MS Windows:
http://www.simtel.net/product.php[id]100916[SiteID]simtel.net
For Linux/Unix:
http://www.simtel.net/product.php[id]117719[SiteID]simtel.net

How to specify a file path in java code to run on Unix machine?

Hi
I have a problem when running my project Swing on Unix machine.
In my code, the user will press a button and then the program will look for the file "ReadMe" in the folder "Documentation" , and reads the content of this file. My code is "Documentation\\ReadMe" and it works well on PC. (The folder "Documentation" is in the same directory with my Java code).
But when I try on Unix, the program can not read the file. It can only read the file "ReadMe" if I take this file and put it in the same directory with my Java code ( this means not through another folder). So how can we make it read the file in a folder ? It seems that "Documentation\\ReadMe" does not work in Unix, or the symbol "\\" does not work.
I would be thankful if anybody can help me with this.
Thank you very much

You really shouldn't use any path method, as neither are very consistant or platform independent. The JVM provides a way to grab resources from the classpath. These resources can be any data at all, in fact, it's how java itself locates classes. Here's an example how you would do this in a non-static method.
public URL getReadMe() {
// In this context the forward slash is universal
String docDirectory = "Documentation/"
// We have to use the classloader to grab the resource
ClassLoader cl = this.getClass().getClassLoader();
// Next we get the resource
URL readMeURL = cl.getResource(docDirectory + "ReadMe");
return readMeURL;
}The URL can be used in whatever way you need to get the information out of the resource. If it was an image you might use the "Toolkit" to make an image object out of it. The great thing about this method is it will work even if your loading the program out of a Jar file. The resource paths start at the top of the classpath, just like classes.

Using unzip from unix in java-code ...

Hi people,
i have problem, i want to use the command unzip from unix, to unzip a zip-file, the commend unzip must invoke from java-code. Can someone help me. I use the zip-api, but i have 100Mb zip-file, it needs very long time to unzip the zip-file.
thanks for your help ...

ok, not sure how much improvement this will give in general, but its given a reliable 25% speed increase on my mini tests
using the nio libraries will also get you a lot further, and is the way to go if you are very keen on speed
asjf
import java.awt.*;
import java.io.*;
import java.util.*;
import java.util.zip.*;
import javax.swing.*;
public class Unzipper {
     private Unzipper() {}
     private static byte[] buffer = new byte[16384];
     public static void unzip(File file, Component parentComponent,     File outputDir) throws ZipException, IOException {
          unzip(new ZipFile(file), parentComponent, outputDir);
     public static void unzip(File file, int mode, Component parentComponent, File outputDir) throws IOException {
          unzip(new ZipFile(file, mode), parentComponent, outputDir);
     public static void unzip(String name, Component parentComponent, File outputDir)     throws IOException {
          unzip(new ZipFile(name), parentComponent, outputDir);
     public static void unzip(ZipFile zip, Component parentComponent, File outputDir)     throws IOException {
          if ( zip == null) {
               throw new NullPointerException("outputDir is null");
          int size = zip.size();
          if (size > 0) {
               if (outputDir == null) {
                    throw new NullPointerException("outputDir is null");
               if (!outputDir.exists()) {
                    outputDir.mkdirs();
               ProgressMonitor monitor =
               new ProgressMonitor(parentComponent,
               "Unpacking " + zip.getName() + "...", "", 0, size);
               monitor.setMillisToDecideToPopup(0);
               monitor.setMillisToPopup(0);
               Enumeration entries = zip.entries();
               for ( int i = 0; entries.hasMoreElements(); ) {
                    ZipEntry entry = (ZipEntry) entries.nextElement();
                    /*if (entry.getMethod() == ZipEntry.DEFLATED)
                    System.out.println(" Inflating: "+entry.getName());
                    else
                    System.out.println(" Extracting: "+entry.getName());*/
                    monitor.setNote(entry.getName());
                    File File = new File(outputDir, entry.getName());
                    File.getParentFile().mkdirs();
                    if (!entry.isDirectory()) {
                         InputStream in = null;
                         OutputStream out = null;
                         try {
                              in = zip.getInputStream(entry);
                              out = new FileOutputStream(File);
                              for (int n = 0; (n = in.read(buffer)) > -1; )
                                   out.write(buffer, 0, n);
                              monitor.setProgress(++i);
                         } finally {
                              if (out != null) {
                                   try {
                                        out.close();
                                   } catch (IOException e) {
     public static void main(String[] args) throws ZipException, IOException
          if (args.length !=2) {
               System.err.println("Usage: java Unzipper <zip file> <output dir>");
               System.exit(1);
          long start = -System.currentTimeMillis();
          unzip(args[0], null, new File(args[1]));
          System.out.println(start+System.currentTimeMillis());
          System.exit(0);

Should I use Process/Mapper or Pure Java Code for XI Adapter?

Hi Friends,
I'm developing a XI Adapter which including sending http request and also data transform, I prefer to implement all the functions by Java Code.
But In NetWeaver XI Server, I find there are tools for creating process and mappers, they also can implement the same functions as Java Code.
So what's your consideration on implementing a function by process or Java code?
Thanks in advance.
Best Regards,
Jason

Hello Jason.
It is a huge job to create your on adapter and I would recommend you to use the default installed adapters whenever possible. Included in the default installed adapters are to name a few; HTTP, FTP, File, SOAP, RFC and IDOC.
Which kind of messages are you transferring with XI? If it's simple XML structures I would recommend you to use Graphical Message Mappings or XSL. If your structures are a bit more complex or if your are transferring byte-structure files I would recommend you to use Java Mappings.
Best Regards,
Jacob

Writing data to a text file in a java code

hey,
can anybody tell me how can i enter data into a text file using java code.
thanx

yeah this is the proper answer....
i had also a pblm ..that i had to read data from an excel sheet and write it to a File thru java code ....
u can also use FileOutPutStream object....if u want...
but there u can give newLine()..so all ur output will be in a single line to the file....
bufferWriter.write(stringToBeWritten);
bufferWriter.newLine();
the stringToBeWritten can be a hardCoded string value..or any dynamic value like say fetching from database...

Batch file to execute java code

Hi,
I need to write a batch file to execute a sequence of java applications.
The problem i face is in addition to the usual libraries I am also using certain jar files i downloaded like the mail interface etc.
When i just compile a java code using a simple batch file giving the path of the compiler and the java code, it fails citing not knowing the location if the packages.
could anyone please let me know what i need to do. Is there like a skeleton that i might find somewhere for this operation

dexterity wrote:
Hi,
I need to write a batch file to execute a sequence of java applications.
The problem i face is in addition to the usual libraries I am also using certain jar files i downloaded like the mail interface etc.
When i just compile a java code using a simple batch file giving the path of the compiler and the java code, it fails citing not knowing the location if the packages.
could anyone please let me know what i need to do. Is there like a skeleton that i might find somewhere for this operationSet the classpath correctly at runtime.
Why do you need the location of your compiler? Are you compiling or running? If you are compiling go look at Ant.

How to read the contents of XML file from my java code

All,
I created an rtf report for one of my EBS reports. Now I want to email this report to several people. Using Tim's blog I implemented the email part. I am sending emails to myself based on the USERID logic.
However I want to email to different people other then me. My email addresses are in the XML file.
From the java program which sends the email, how can I read the fields from XML file. If any one has done this, Please point me to the right examples.
Please let me know if there are any exmaples/BLOG's which explain how to do this(basically read the contents of XML file in the Java program).
Thank You,
Padma

Ike,
Do you have a sample. I am searched so much in this forum for samples. I looked on SAX Parser. I did not find any samples.
Please help me.
Thank you for your posting.
Padma.

Using Unix command lines in java code

I was wondering if there was a way to run a unix command in java code. I know in C++ there is popen, but i don't know of a way in java. The command i need to run is the whois "domain name" command. Any help would be great!
jarad

try something like this:
public static String whois(String domain) throws IOException {
    BufferedReader is = null;
    Process p = null;
    String result = "";
    p = Runtime.getRuntime().exec("whois " + domain);
    is = new BufferedReader(new InputStreamReader(p.getInputStream()));
    String line;
    while((line = is.readLine()) != null)
      result += line;
    return result;
}

What are the simple to use COM library in your java code

Hi,
what are the simple to use COM library in your java code

PhHein wrote:
[javax/comm|http://java.sun.com/products/javacomm/reference/api/javax/comm/package-summary.html]
No, he wants to use Windows COM objects!
@OP
It's not easy. You can try j-integra or ezjcom, which I tried years ago and was not too happy, but maybe
they improved or they are just fine for your needs. $$$ involved!
If you want to do it by yourself, it won't be easy at all, I promise, but it can be done with JNI or JNA.
If your interactions are very few and simple, maybe some workarounds could be found.

How to Save a File form a JAVA code into the CDrive

Hello, i need to create a file and save it in the Cdrive of my computer.
I could create the file and get the command prompt to ask me the file name to save it.
However, my problem is that the file is saved in the Cdrive with nothing inside! I can manage to save the file and give it a name, but i can't save the inside of it... the page comes blank...
if someone could help me and tell me why the inside isn't there and how to fix it, it could be very very helpfull!
thx
waiting for any reply
the part where i know i got it wrong is this:
// Save the File.txt in the Cdrive + MSG
               System.out.println( FILENAME_MSG ) ;
               BufferedReader br = new BufferedReader( new InputStreamReader ( System.in ),1 ) ;
               PeastBase = br.readLine() ;
               FileOutputStream fout = new FileOutputStream ( PeastBase ) ;
               OutputStreamWriter out = new OutputStreamWriter ( fout , "Shift_JIS" ) ;
               // Write in File
               out.write( CopyBase ) ;
               // Save PeastBase
               out.flush() ;
               // Close the Bufferedwriter
               out.close() ;
Anyway these are the complete code in case of need:
import java.io.*;
import java.util.ArrayList;
class Exp11 {
     public static void main(String[] args) throws IOException{
          try{
               File objCopyBaseFile = new File( "aaa" ) ;
               File objPeastBaseFile = new File( "bbb" ) ;
               //MAX Letters and Lines Input
               final int MAX_COLS = 10 ;
               final int MAX_ROWS = 10 ;
               final String START_MSG = "Input any LETTER" ;
               final String START_MSG1 = "10 LETTERS per Line, 10 LINES Max is Possible" ;
               final String START_MSG2 = "Input w will Save the FILE and FINISH" ;
               final String COUNT_STRING_ERROR = "Letters Input per Line is OVER" ;
               final String COUNT_ROW_ERROR = "Lines Number is OVER" ;
               final String FILENAME_MSG = "Input the File Name" ;
               String PeastBase ;
               String InputBase ;
               String cpBuffer ;
               String CopyBase ;
               int rownumber ;
               PeastBase = " " ;
               InputBase = "w" ;
               cpBuffer = " " ;
               CopyBase = " " ;
               rownumber = 0 ;
               FileOutputStream fos = new FileOutputStream( "fos.txt" ) ;
               OutputStreamWriter ow = new OutputStreamWriter( fos , "EUC-JP" ) ;
               BufferedWriter bw = new BufferedWriter( new FileWriter ( "out.txt", true )) ;
               // Start MSG
               System.out.println( START_MSG ) ;
               System.out.println( START_MSG1 ) ;
               System.out.println( START_MSG2 ) ;
               // Input
               ArrayList<String> array = new ArrayList<String>() ;
               int i ;
               i = 0 ;
               do {
                    BufferedReader br = new BufferedReader( new InputStreamReader ( System.in ),1 ) ;
                    PeastBase = br.readLine() ;
                    // Let's Count
                    if( !PeastBase.equals( InputBase) ){
                         rownumber ++ ;
                         // Check the Input letters
                         if ( countString(PeastBase,MAX_COLS )){
                              array.add(PeastBase) ;
                         else{
                              System.out.println( COUNT_STRING_ERROR ) ;
                         // Check the Lines
                         if ( countRow( rownumber,MAX_ROWS )){
                              array.add( PeastBase ) ;
                         else{
                              System.out.println( COUNT_ROW_ERROR ) ;
               } while ( !PeastBase.equals( InputBase ) ) ;
               // enter the data
               for( int      j=0;j<array.size();j++ ){
                    System.out.println( "How Many Time Input==>"+array.get(j) ) ;
               // Save the File.txt in the Cdrive + MSG
               System.out.println( FILENAME_MSG ) ;
               BufferedReader br = new BufferedReader( new InputStreamReader ( System.in ),1 ) ;
               PeastBase = br.readLine() ;
               FileOutputStream fout = new FileOutputStream ( PeastBase ) ;
               OutputStreamWriter out = new OutputStreamWriter ( fout , "Shift_JIS" ) ;
               // Write in File
               out.write( CopyBase ) ;
               // Save PeastBase
               out.flush() ;
               // Close the Bufferedwriter
               out.close() ;
          catch ( IOException e ){
               System.out.println( e ) ;
          finally{
     static boolean countString ( String bufString , int maxCount ) throws IOException{
          int StringCnt ;
          StringCnt = 0 ;
          // Count Letters per Lines
          StringCnt = bufString.length() ;
          if( maxCount>= StringCnt ){
               return true ;
          else{
               return false ;
     static boolean countRow ( int rownumber , int maxLine) throws IOException{
          int StringLine ;
          StringLine = 0 ;
          if( maxLine>= rownumber ){
               return true ;
          else{
               return false ;
PLEASE ANY HELP
THX

I'm not great with IO yet, but I see you use
out.write(CopyBase);But I only see you initialize CopyBase to equal an empty String.
So it should be writing nothing to the file.

Using .bat file to run java application

I want to be able to trigger Java class from SQL command. SQL statement will execute batch file, which contains all information about my java class and about CLASSPATH variable.
Unfortunately, it does not work as planed. I get this message in Query Analyzer:
output Compile first.
RUN COMPILED FILE NOW
java.lang.NoClassDefFoundError: \\finkelsteine\autotest\CommandLineTest
Exception in thread "main"
(4 row(s) affected)
Here is SQL I use:
DECLARE @cmd varchar(1000),
@result int
SET @cmd = '\\mycomputer\autotest\autotest.bat'
EXEC @result = master..xp_cmdshell @cmd
select @result
Here is the autotest.bat file:
@ECHO OFF
SET PATH=%PATH%;C:\jdk1.2.2\bin;C:\jdk1.2.2\jre;C:\jdk1.2.2\lib
SET CLASSPATH=c:\autotest;%CLASSPATH%
ECHO Compile first.
javac c:\autotest\CommandLineTest.java
ECHO RUN COMPILED FILE NOW
java c:\autotest\CommandLineTest
Here is my CommandLineTest.java file
import java.io.*;
public class CommandLineTest
public CommandLineTest() {
super();
public static void main(java.lang.String[] args)
File file = null;
PrintWriter out = null;
file = new File("c:\\autotest\\test.txt");
try
// Create an output stream
out = new PrintWriter(new BufferedWriter new FileWriter(file)));
out.println("Hello there");
out.flush();
out.close();
catch(IOException ioex)
ioex.printStackTrace();
System.out.println("IO exception");
please help.

The argument to the java command is the name of the class to run, not a path to the class file. You must have the classpath environmental variable set up properly for the class to run.

How to pass arguments to a batch file from java code

Hi
I have a batch file (marcxml.bat) which has the following excerpt :
@echo off
if x==%1x goto howto
java -cp C:\Downloads\Marcxml\marc4j.jar; C:\Downloads\Marcxml\marcxml.jar; %1 %2 %3
goto end
I'm calling this batch file from a java code with the following line of code:
Process p = Runtime.getRuntime().exec("cmd /c start C:/Downloads/Marcxml/marcxml.bat");
so ,that invokes the batch file.Till that point its ok.
since the batch file accpets arguments(%1 %2 %3) how do i pass those arguments to the batch file from my code ...???
%1 is a classname : for ex: gov.loc.marcxml.MARC21slim2MARC
%2 is the name of the input file for ex : C:/Downloads/Marcxml/source.xml
%3 is the name of the output file for ex: C:/Downloads/Marcxml/target.mrc
could someone help me...
if i include these parameters too along with the above line of code i.e
Process p = Runtime.getRuntime().exec("cmd /c start C:/Downloads/Marcxml/marcxml.bat gov.loc.marcxml.MARC21slim2MARC C:\\Downloads\\Marcxml\\source.xml C:\\Downloads\\Marcxml\\target.mrc") ;
I get the following error :
Exception in thread main java.lang.Noclassdef foundError: c:Downloads\marcxml\source/xml
could some one tell me if i'm doing the right way in passing the arguments to the batch file if not what is the right way??
Message was edited by:
justunme1

1 - create a java class (Executer.java) for example:
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class Executer {
     public static void main(String[] args) {
          try {
               for (int i = 0; i < args.length; i++) {
                    System.out.println(args);
               Class<?> c = Class.forName(args[0]);
               Class[] argTypes = new Class[] { String[].class };
               Method main = c.getDeclaredMethod("main", argTypes);
               // String[] mainArgs = Arrays.copyOfRange(args, 1, args.length); //JDK 6
               //jdk <6
               String[] mainArgs = new String[args.length - 1];
               for (int i = 0; i < mainArgs.length; i++) {
                    mainArgs[i] = args[i + 1];
               main.invoke(null, (Object) mainArgs);
               // production code should handle these exceptions more gracefully
          } catch (ClassNotFoundException x) {
               x.printStackTrace();
          } catch (NoSuchMethodException x) {
               x.printStackTrace();
          } catch (IllegalAccessException x) {
               x.printStackTrace();
          } catch (InvocationTargetException x) {
               x.printStackTrace();
          } catch (Exception e) {
               e.printStackTrace();
2 - create a .bat file:
@echo off
java -cp C:\Downloads\Marcxml\marc4j.jar; C:\Downloads\Marcxml\marcxml.jar; Executer %TARGET_CLASS% %IN_FILE% %OUT_FILE%3 - use set command to pass variable:
Open MS-DOS, and type the following:
set TARGET_CLASS=MyTargetClass
set IN_FILE=in.txt
set OUT_FILE=out.txt
Then run your .bat file (in the same ms dos window)
Hope that Helps

OpenScript/How to add .jar file to Java Code in relative path

Hi all,
I want to add a .jar file which can be executed separately (like "java -jar A.jar") to my recorded Java Code.I've read this wiki http://everest2.us.oracle.com/wiki/Generic_JAR_Project about how to add a .jar file to "Assets", however, I cannot figure out how to use the .jarr file in Java code,I mean , how to get this .jar file like the method the databank added in "Assets"?
Things I did are as followed:
1.Execute my .jar file in OpenScript Java code with absolute path like this:
String cmd = "C:\Users\A.jar";
Runtime.getRuntime().exec(cmd);
This does work, but must set a absolute path in Java code like "C:\User\A.jar" ,which is not the workaround I want (I need my scripts can be run on other machines).
2.Try to get its current path with following codes:
File directory = new File(".");
String currentPath=directory.getCanonicalPath();
However,though this can get its absolute path (which is the the project path) in Eclipse like "C:\Users\Workspace\testProject", this only gets "C:\OracleATS\openScript" in OpenScript.
I thought to copy my .jar file to the project path , got its current path in java code first,then can know the path of .jar file, but this workaround failed because of the above reason.
I notice that in the "Assets" there are "Databanks","Object Libraries","JAR Files","Scripts". Since the databanks and scripts that added to "Databanks" and "Scripts" can be got or run in Java Code like:
*getDatabank("DatabankName").getNextDatabankRecord(); String data = eval("{{db.DatabankName.data}}");*
*or getScript("ScriptName").run();*
*Is there a method to get and run the jar file added to "Assets\JAR Files" like the above?*
Thank you very much!
Regards,
Angyoung

Hi DM,
Thanks for your reply!
I've found a workaround,which is calling OpenScript's APIs ,such as this.getScriptPackage().getRepository() and this.getScriptPackage().getWorkspace(),etc to locate the .jar file.
And this workaround can still work even though the script is run on other machine.
Sorry to reply you so late!
Regards,
Angyoung

Using c files in a java code

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