zius oram

thank you sir,
i got it working. it was classpath.

hello all,
i am using redhat linux, i compiled HelloNative.java, generated .h file, generated shared library till here it is fine, but when i compile HelloNativeTest.java file it is giving me Error at line
HelloNative.greeting();
HelloNative can not be resolved.
i have included my directory(named jni) to lib path as LD_LIBRARY_PATH=.:/root/jni

thank you for your reply, let me explain the situation.
i am devloping this application for a internet lab, here users are not root, i from my server want to grant access or restrict the use of resources (usb-restricts download, cd rom-no download, drive-dont play with vital data, printer-ask me first), and if there is any other way to do it please tell me, i deadly need to devlope it in time.

Jan Cumps wrote:Are you realy shure you want to develop an application that can be used remotely, and that executes commands on the server as root?

it is sitting on server and executing commands as a super user on client.

not remote sshd, actually i am devloping an application to assist sysadmins, i will change the settings on client machine myself, i have all root user/password on admins machine and from there onwards i want to restrict the client access to certain devices. can it be done?

thank you for your reply,
if SSHD is not active how can i activate it, and if permitted a remote root, can i investigate clients ACL (ie chacl).

hello all,
my project requires to restrict the access of some files/devices for the client on his local machine. can i as a admin login as a super user on client's computer (ofcourse i know the root user/pasword) and change the access control list. or is there any other way to restrict him through my computer.
thak you.

// i got it from ranch hope you find it usefull

import java.awt.AWTException; import java.awt.Robot; import java.awt.Rectangle; import java.awt.Toolkit; import java.awt.image.BufferedImage; import java.io.*; import javax.imageio.ImageIO; class ScreenCapture { public static void main(String args[]) throws AWTException, IOException { // capture the whole screen BufferedImage screencapture = new Robot().createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()) ); // Save as JPEG File file = new File("screencapture.jpg"); ImageIO.write(screencapture, "jpg", file); // Save as PNG // File file = new File("screencapture.png"); // ImageIO.write(screencapture, "png", file); } }

when you want to transmitt the image on network it is quite easy with byte[]... write image in file, read it in byte[], transmitt byte[] and write
in file. this read and write can be by directional from server to client or other way.

while using c++ as my native language(to lock resources of remote machine) can i use QT framework to devlope application with JNI and RMI?

thank you all for your reply. sounds great that its no diffrence devloping java on linux or windows.
thank you.

Thank You its working........
i followed all the steps specified by you, but the mistake i made was, I Omitted The Space in " \ Files", from the command you gave above.

$gcc -mno-cygwin -D __int64="long long" -I /cygdrive/c/Program\ File/java/jdk1.6.0/include/
-I /cygdrive/c/Program\ Files/java/jdk1.6.0/include/win32 -shared -Wl, --add-stdcall-alias -o HelloNative.dll HelloNative.c

Thank you once again.

did it, now it is
In file included from HelloNative.c:1:
HelloNative.h:2:17: jni.h:no such file or directory
In file included from HelloNative.c:1:
HelloNative.h:15:error: syntax error before "void"
HelloNative.h:16:error: parse error before '*' token
HelloNative.h:16:warning: data defination has no type or storage class
HelloNative.c:4:error: syntax error before "void"
HelloNative.c:4:error: parse error before '*' token

i did it, now error has changed to
cc1: error:unrecogniszed command line option "-fmno-cygwin"

when i removed one hifen (-) shown above(--mno)and now (-mno) it gives me error
HelloNative.c :1:24: HelloNative.h: no such File or Directory
HelloNative.c:4:error: syntax error before "void"
HelloNative.c:4:error: parse error before '*' token
my HelloNative.c file is as...


#include<HelloNative.h> #include<stdio.h> JNIEXPORT void JNICALL Java_HelloNative_greeting(JNIEnv *, jclass) { printf("HELLO NATIVE WORLD................"); }

HelloNative.H file is....

/* DO NOT EDIT THIS FILE - it is machine generated */ #include <jni.h> /* Header for class HelloNative */ #ifndef _Included_HelloNative #define _Included_HelloNative #ifdef __cplusplus extern "C" { #endif /* * Class: HelloNative * Method: greeting * Signature: ()V */ JNIEXPORT void JNICALL Java_HelloNative_greeting (JNIEnv *, jclass); #ifdef __cplusplus } #endif #endif

i checked it is HelloNative.c , i am confused how gcc will come to know about my C file? as no where i am mentioning its location.

thank you,
now the only error is gcc: HelloNative.C : no such file or directory.
i have HelloNative.java, HelloNativeTest.java, HelloNative.C(written in notepad), HelloNative.h in different directory(e:\).