Здравствуйте, nant, Вы писали:
N>Приложение Java или native?
Приложение вот такое
public class Test {
public static void main(String args[]) {
JMatLink engine=new JMatLink();
engine.engOpenSingleUse();
engine.engEvalString("m=2");
engine.engClose();
}
}
JMatLink — это класс, который обращается к dll. Т.е. он и вызывает System.loadLibrary("JMatLink"), и остальные методы.
Вот он
import java.io.*;
public class JMatLink extends Thread {
// static declarations
// the variable "status" is used to tell the main
// thread what to do.
private final static int idleI = 0;
private final static int engOpenI = 1;
private final static int engCloseI = 2;
private final static int engEvalStringI = 3;
private final static int engGetScalarI = 4;
private final static int engGetVectorI = 5;
private final static int engGetArrayI = 6;
private final static int engPutArray2dI = 9;
private final static int engOutputBufferI = 10;
private final static int engGetCharArrayI = 11;
private final static int destroyJMatLinkI = 12;
private final static int engOpenSingleUseI = 13;
// All variables are global to allow all methods
// and the main thread to share all data
private int status = idleI;
private String arrayS;
private String engEvalStringS;
private String engOutputBufferS;
private double engGetScalarD;
private double[] engGetVectorD;
private double[][] engGetArrayD;
private double engPutArrayD;
private double[] engPutArray1dD;
private double[][] engPutArray2dD;
private String[] engGetCharArrayS;
private int epI; /* Engine pointer */
private int retValI; /* return Value of eng-methods */
private String startCmdS; /* start command for engOpen... */
private int buflenI; /* output buffer length */
private boolean debugB = false;
// Locks
private boolean lockEngineB = false;
private boolean lockThreadB = false;
private boolean lockWaitForValueB = false;
private boolean destroyJMatLinkB = false;
private Thread runner;
// *********************** native declarations ****************************
// NEVER call native methods directly, like
// JMatLink.engEvalStringNATIVE("a=1"). Matlab's engine has quite some
// thread problems.
private native void displayHelloWorld();
private native void engTestNATIVE();
private native int engOpenNATIVE (String startCmdS );
private native int engOpenSingleUseNATIVE (String startCmdS );
private native int engCloseNATIVE (int epI);
private native int engEvalStringNATIVE (int epI, String evalS );
private native double engGetScalarNATIVE (int epI, String nameS );
private native double[] engGetVectorNATIVE (int epI, String nameS );
private native double[][] engGetArrayNATIVE (int epI, String nameS );
private native String[] engGetCharArrayNATIVE (int epI, String nameS );
private native void engPutArrayNATIVE (int epI, String matrixS, double[][] valuesDD);
private native String engOutputBufferNATIVE (int epI, int buflenI );
private native void setDebugNATIVE (boolean debugB );
// *******************************************************************************
// ************** load JMatLink library into memory **********************
static {
try { //System.out.println("loading");
System.loadLibrary("JMatLink");
//System.out.println("loaded");
}
catch (UnsatisfiedLinkError e) {
System.out.println("ERROR: Could not load the JMatLink library");
System.out.println(" This error occures, if the path to");
System.out.println(" matlab's <matlab>\\bin directory is");
System.out.println(" not set properly.");
System.out.println(" Or if JMatLink.dll is not found.");
}
}
// ************************ JMatLink constructor ***************************
/** This is the constructor for the JMatLink library.
*
* <p>E.g.:<br>
* <pre>
* <b>JMatLink</b> engine = new <b>JMatLink()</b>;
* engine.engOpen();
* engine.engEvalString("surf(peaks)");
* engine.engClose();
* </pre>
***************************************************************************/
public JMatLink() {
if (debugB) System.out.println("JMatLink constructor");
runner = new Thread(this);
runner.start();
}
// **** terminate running thread ****
public void destroy() {
destroyJMatLinkB = true;
notifyAll();
}
public void kill() {
destroyJMatLinkB = true;
callThread(destroyJMatLinkI);
}
//////////////////////////////////////////////////////////////////////////////
// ***************************** engOpen *****************************
/** Open engine. This command is used to open a <b>single</b> connection
* to matlab.
*
* <p>E.g.:<br>
* <pre>
* JMatLink engine = new JMatLink();
* engine.<b>engOpen()</b>;
* engine.engEvalString("surf(peaks)");
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized int engOpen()
{
return engOpen( "" ); // return value is pointer to engine
}
// ***************************** engOpen *******************************
/** Open engine. This command is used to open a <b>single</b> connection
* to matlab.<p> This command is only useful on unix systems. On windows
* the optional parameter <b>must</b> be NULL.
*
* <p>E.g.:<br>
* <pre>
* JMatLink engine = new JMatLink();
* engine.<b>engOpen("commands to start matlab")</b>;
* engine.engEvalString("surf(peaks)");
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized int engOpen(String startCmdS)
{
// startup MATLAB and set up connection
lockEngineLock();
lockWaitForValue();
this.startCmdS = startCmdS;
callThread( engOpenI );
WaitForValue();
releaseEngineLock();
return this.epI;
}
// ************************** engOpenSingleUse *****************************
/** Open engine for single use. This command is used to open
* <b>multiple</b> connections to matlab.
*
* <p>E.g.:<br>
* <pre>
* int a,b;
* JMatLink engine = new JMatLink();
* a = engine.<b>engOpenSingleUse()</b>; // start first matlab session
* b = engine.<b>engOpenSingleUse()</b>; // start second matlab session
* engine.engEvalString(a, "surf(peaks)");
* engine.engEvalString(b, "foo=ones(10,0)");
* engine.engClose(a);
* engine.engClose(b);
* </pre>
***************************************************************************/
public synchronized int engOpenSingleUse()
{
return engOpenSingleUse("");
}
// ************************** engOpenSingleUse *****************************
/** Open engine for single use. This command is used to open
* <b>multiple</b> connections to matlab.
*
* <p>E.g.:<br>
* <pre>
* int a,b;
* JMatLink engine = new JMatLink();
* a = engine.<b>engOpenSingleUse("start matlab")</b>; // start first matlab session
* b = engine.<b>engOpenSingleUse("start matlab")</b>; // start second matlab session
* engine.engEvalString(a, "surf(peaks)");
* engine.engEvalString(b, "foo=ones(10,0)");
* engine.engClose(a);
* engine.engClose(b);
* </pre>
***************************************************************************/
public synchronized int engOpenSingleUse(String startCmdS)
{
lockEngineLock();
lockWaitForValue();
this.startCmdS = startCmdS;
callThread( engOpenSingleUseI );
WaitForValue();
releaseEngineLock();
return this.epI;
}
// ***************************** engClose *****************************
/** Close the connection to matlab.
*
* <p>E.g.:<br>
* <pre>
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.engEvalString("surf(peaks)");
* engine.<b>engClose()</b>;
* </pre>
***************************************************************************/
public synchronized void engClose()
{
engClose( this.epI );
}
// ***************************** engClose *****************************
/** Close a specified connection to an instance of matlab.
*
* <p>E.g.:<br>
* <pre>
* int a,b;
* JMatLink engine = new JMatLink();
* a = engine.engOpenSingleUse(); // start first matlab session
* b = engine.engOpenSingleUse(); // start second matlab session
* engine.engEvalString(b, "surf(peaks)");
* engine.engEvalString(a, "array = randn(23)");
* engine.<b>engClose</b>(a); // Close the first connection to matlab
* engine.<b>engClose</b>(b); // Close the second connection to matlab
* </pre>
***************************************************************************/
public synchronized void engClose( int epI)
{
// close connection and terminate MATLAB
lockEngineLock();
lockWaitForValue();
this.epI = epI;
callThread( engCloseI );
WaitForValue();
releaseEngineLock();
// return retValI; Return value indicates success
}
// ***************************** engEvalString *****************************
/** Evaluate an expression in matlab's workspace.
*
* E.g.:<br>
* <pre>
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.<b>engEvalString</b>("surf(peaks)");
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized void engEvalString(String evalS)
{
engEvalString( this.epI, evalS);
}
// ***************************** engEvalString *************************
/** Evaluate an expression in a specified workspace.
*
* <p>E.g.:<br>
* <pre>
* int a,b;
* JMatLink engine = new JMatLink();
* a = engine.engOpenSingleUse();
* engine.<b>engEvalString</b>(a, "surf(peaks)");
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized void engEvalString(int epI, String evalS)
{
// evaluate expression "evalS" in specified engine Ep
if (debugB) System.out.println("eval(ep,String) in " + epI + " "+evalS);
lockEngineLock();
lockWaitForValue();
this.epI = epI;
engEvalStringS = evalS;
callThread( engEvalStringI );
WaitForValue();
releaseEngineLock();
if (debugB) System.out.println("eval(ep,String) out "+epI+" "+evalS);
// return retValI; Return value indicates success
}
// ***************************** engGetScalar **************************
/** Get a scalar value from matlab's workspace.
*
* <p>E.g.:<br>
* <pre>
* double a;
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.engEvalString("foo = sin( 3 )");
* a = engine.<b>engGetScalarValue</b>("foo");
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized double engGetScalar(String arrayS)
{
return engGetScalar( this.epI, arrayS);
}
// ***************************** engGetScalar **************************
/** Get a scalar value from a specified workspace.
*
* <p>E.g.:<br>
* <pre>
* double a;
* int b;
* JMatLink engine = new JMatLink();
* b = engine.engOpenSigleUse();
* engine.engEvalString(b, "foo = sin( 3 )");
* a = engine.<b>engGetScalarValue</b>(b, "foo");
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized double engGetScalar(int epI, String arrayS)
{
// Get scalar value or element (1,1) of an array from
// MATLAB's workspace
// Only real values are supported right now
lockEngineLock();
lockWaitForValue();
/* copy parameters to global variables */
this.epI = epI;
this.arrayS = arrayS;
callThread( engGetScalarI );
WaitForValue();
releaseEngineLock();
return engGetScalarD;
}
// ***************************** engGetVector **************************
/** Get an array (1 * n) from matlab's workspace.
*
* <p>E.g.:<br>
* <pre>
* double[] array;
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.engEvalString("array = randn(10,1);");
* array = engine.<b>engGetVector</b>("array");
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized double[] engGetVector( String arrayS )
{
return engGetVector( this.epI, arrayS );
}
// ***************************** engGetVector **************************
/** Get an array (1 * n) from a specified workspace.
*
* <p>E.g.:<br>
* <pre>
* int b;
* double[] array;
* JMatLink engine = new JMatLink();
* b = engine.engOpenSingleUse();
* engine.engEvalString(b, "array = randn(10,1);");
* array = engine.<b>engGetVector</b>(b, "array");
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized double[] engGetVector( int epI, String arrayS )
{
// only real values are supported so far
lockEngineLock();
lockWaitForValue();
this.epI = epI;
this.arrayS = arrayS;
callThread( engGetVectorI );
WaitForValue();
releaseEngineLock();
return engGetVectorD;
}
// ***************************** engGetArray ***************************
/** Get an array from matlab's workspace.
*
* <p>E.g.:<br>
* <pre>
* int b;
* double[][] array;
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.engEvalString("array = randn(10);");
* array = engine.<b>engGetArray</b>("array");
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized double[][] engGetArray( String arrayS )
{
return engGetArray( this.epI, arrayS );
}
// ***************************** engGetArray ***************************
/** Get an array from a specified instance/workspace of matlab.
*
* <p>E.g.:<br>
* <pre>
* int b;
* double[][] array;
* JMatLink engine = new JMatLink();
* b = engine.engOpenSingleUse();
* engine.engEvalString(b, "array = randn(10);");
* array = engine.<b>engGetArray</b>(b, "array");
* engine.engClose(b);
* </pre>
***************************************************************************/
public synchronized double[][] engGetArray( int epI, String arrayS )
{
// only real values are supported so far
lockEngineLock();
lockWaitForValue();
this.epI = epI;
this.arrayS = arrayS;
callThread( engGetArrayI );
WaitForValue();
releaseEngineLock();
return engGetArrayD;
}
// ************************** engGetCharArray *****************************
/** Get an 'char' array (string) from matlab's workspace.
*
* <p>E.g.:<br>
* <pre>
* String array;
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.engEvalString("array = 'hello world';");
* array = engine.<b>engCharArray</b>("array");
* System.out.println("output = "+ array);
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized String[] engGetCharArray(String arrayS)
{
// convert to double array
engEvalString( "engGetCharArrayD=double(" + arrayS +")" );
// get double array
double[][] arrayD = engGetArray("engGetCharArrayD");
// delete temporary double array
engEvalString("clear engGetCharArrayD");
// convert double back to char
return double2String( arrayD );
}
// ***************************** engPutArray ***************************
/** Put an array into a specified workspace.
*
* <p>E.g.:<br>
* <pre>
* int array = 1;
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.<b>engPutArray</b>("array", array);
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized void engPutArray( String arrayS, int valueI )
{
engPutArray( this.epI, arrayS, new Integer(valueI).doubleValue());
}
// ***************************** engPutArray ***************************
// public synchronized void engPutArray( String arrayS, int[] valuesI )
// {
// engPutArray( this.epI, arrayS, (double[])valuesI );
// }
// ***************************** engPutArray ***************************
/** Put an array into matlab's workspace.
*
* <p>E.g.:<br>
* <pre>
* double array = 1;
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.<b>engPutArray</b>("array", array);
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized void engPutArray( String arrayS, double valueD )
{
engPutArray( this.epI, arrayS, valueD);
}
// ***************************** engPutArray *****************************
/** Put an array into a specified instance/workspace of matlab.
*
* <p>E.g.:<br>
* <pre>
* int b;
* double array = 1;
* JMatLink engine = new JMatLink();
* b = engine.engOpenSingleUse();
* engine.<b>engPutArray</b>(b, "array", array);
* engine.engClose(b);
* </pre>
***************************************************************************/
public synchronized void engPutArray( int epI, String arrayS, double valueD )
{
double vDD[][] = {{0.0}};
vDD[0][0] = valueD;
engPutArray( epI, arrayS, vDD ); // nxn dimensional
}
// ***************************** engPutArray ***************************
/** Put an array (1 dimensional) into a specified instance/workspace of
* matlab.
*
* <p>E.g.:<br>
* <pre>
* double[] array = {1.0 , 2.0 , 3.0};
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.<b>engPutArray</b>("array", array);
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized void engPutArray( String arrayS, double[] valuesD )
{
engPutArray( this.epI, arrayS, valuesD );
}
// ***************************** engPutArray *****************************
/** Put an array (1 dimensional) into a specified instance/workspace of
* matlab.
*
* <p>E.g.:<br>
* <pre>
* int b;
* double[] array = {1.0 , 2.0 , 3.0};
* JMatLink engine = new JMatLink();
* b = engine.engOpenSingleUse();
* engine.<b>engPutArray</b>(b, "array", array);
* engine.engClose(b);
* </pre>
***************************************************************************/
public synchronized void engPutArray(int epI, String arrayS, double[] valuesD)
{
double[][] vDD = new double[1][valuesD.length]; // 1xn array
if (debugB) System.out.println("length = "+valuesD.length);
vDD[0] = valuesD; // copy row
engPutArray( epI, arrayS, vDD );
}
// ***************************** engPutArray ***************************
/** Put an array (2 dimensional) into matlab's workspace.
*
* <p>E.g.:<br>
* <pre>
* double[][] array={{1.0 , 2.0 , 3.0},
* {4.0 , 5.0 , 6.0}};
* JMatLink engine = new JMatLink();
* engine.engOpenSingleUse();
* engine.<b>engPutArray</b>("array", array);
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized void engPutArray( String arrayS, double[][] valuesDD )
{
engPutArray( this.epI, arrayS, valuesDD );
}
// ***************************** engPutArray ***************************
/** Put an array (2 dimensional) into a specified instance/workspace of
* matlab.
*
* <p>E.g.:<br>
* <pre>
* int b;
* double[][] array={{1.0 , 2.0 , 3.0},
* {4.0 , 5.0 , 6.0}};
* JMatLink engine = new JMatLink();
* b = engine.engOpenSingleUse();
* engine.engPutArray(b, "array", array);
* engine.engClose(b);
* </pre>
***************************************************************************/
public synchronized void engPutArray(int epI, String arrayS, double[][] valuesDD)
{
// send an array to MATLAB
// only real values are supported so far
lockEngineLock();
lockWaitForValue();
this.epI = epI;
this.arrayS = arrayS;
this.engPutArray2dD = valuesDD;
callThread( engPutArray2dI );
WaitForValue();
releaseEngineLock();
}
// ***************************** engOutputBuffer ***********************
/** Return the outputs of previous commands from matlab's workspace.
*
* <p>E.g.:<br>
* <pre>
* String buffer;
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.engEvalString("surf(peaks)");
* buffer = engine.<b>engOutputBuffer</b>();
* System.out.println("workspace " + buffer);
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized String engOutputBuffer( )
{
return engOutputBuffer( this.epI, this.buflenI );
}
// ***************************** engOutputBuffer ***********************
/** Return the outputs of previous commands from a specified instance/
* workspace form matlab.
*
* <p>E.g.:<br>
* <pre>
* String buffer;
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.engEvalString("surf(peaks)");
* buffer = engine.<b>engOutputBuffer</b>();
* System.out.println("workspace " + buffer);
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized String engOutputBuffer( int epI )
{
return engOutputBuffer( epI, this.buflenI );
}
// ***************************** engOutputBuffer ***********************
/** Return the ouputs of previous commands in matlab's workspace.
*
* Right now the parameter <i>buflen</i> is not supported.
*
* <p>E.g.:<br>
* <pre>
* String buffer;
* JMatLink engine = new JMatLink();
* engine.engOpen();
* engine.engEvalString("surf(peaks)");
* buffer = engine.<b>engOutputBuffer</b>();
* System.out.println("workspace " + buffer);
* engine.engClose();
* </pre>
***************************************************************************/
public synchronized String engOutputBuffer( int epI, int buflenI )
{
// get the output buffer from MATLAB
if (debugB) System.out.println("Thread in: "+Thread.currentThread().getName());
lockEngineLock();
lockWaitForValue();
this.epI = epI;
this.buflenI = buflenI;
callThread( engOutputBufferI );
WaitForValue();
releaseEngineLock();
if (debugB) System.out.println("Thread out: "+Thread.currentThread().getName());
return engOutputBufferS;
}
// ***************************** setDebug *******************************
/* Switch on or disable debug information printed to standard output.
*
* <p>Default setting is debug info disabled.
* <p>E.g.:<br>
* <pre>
* JMatLink engine = new JMatLink();
* engine.engOpenSingleUse();
* engine.<b>setDebug(true)</b>;
* engine.engEvalString("a=ones(10,5);");
* engine.engClose();
* </pre>
***************************************************************************/
public void setDebug( boolean debugB )
{
this.debugB = debugB;
setDebugNATIVE( debugB );
}
////////////////////////////////////////////////////////////////////////////////
// This method notifys the main thread to call matlab's engine
// Since threads don't have methods, we set a variable which
// contains the necessary information about what to do.
private synchronized void callThread(int status)
{
this.status = status;
lockThreadB = false;
notifyAll();
}
////////////////////////////////////////////////////////////////////////////////
// The run methods does ALL calls to the native methods
// The keyword "synchronized" is neccessary to block the run()
// method as long as one command needs to get executed.
public synchronized void run()
{
int tempRetVal;
if (debugB) System.out.println("JMatLink: thread is running");
while (true) {
// System.out.println("Number of Java-Threads: "+Thread.activeCount()+"");
// Thread thread = Thread.currentThread();
// System.out.println("Name of active Java-Threads: "+thread.getName()+"");
// System.out.println("active Java-Thread is Daemon: "+thread.isDaemon();+"");
switch (status) {
case engOpenI: epI = engOpenNATIVE( startCmdS );
releaseWaitForValue();
break;
case engOpenSingleUseI: epI = engOpenSingleUseNATIVE( startCmdS );
releaseWaitForValue();
break;
case engCloseI: retValI = engCloseNATIVE( epI );
releaseWaitForValue();
break;
case engEvalStringI: retValI = engEvalStringNATIVE(epI, engEvalStringS);
releaseWaitForValue();
break;
case engGetScalarI: engGetScalarD = engGetScalarNATIVE(epI, arrayS );
releaseWaitForValue();
break;
case engGetVectorI: engGetVectorD = engGetVectorNATIVE(epI, arrayS );
releaseWaitForValue();
break;
case engGetArrayI: engGetArrayD = engGetArrayNATIVE(epI, arrayS );
releaseWaitForValue();
break;
case engGetCharArrayI: engGetCharArrayS = engGetCharArrayNATIVE(epI, arrayS );
releaseWaitForValue();
break;
case engPutArray2dI: engPutArrayNATIVE( epI, arrayS, engPutArray2dD );
releaseWaitForValue();
break;
case engOutputBufferI: engOutputBufferS = engOutputBufferNATIVE( epI, buflenI );
releaseWaitForValue();
break;
default: //System.out.println("thread default switch statem.");
}
status=0;
lockThreadB = true;
while (lockThreadB == true) {
synchronized(this) {
try { wait();} // wait until next command is available
catch (InterruptedException e) { }
}
}
//System.out.println("JMatLink: thread awoke and passed lock");
if (destroyJMatLinkB == true) break;
} // end while
if (debugB) System.out.println("JMatLink: thread terminated");
} // end run
////////////////////////////////////////////////////////////////////////////////
// The MATLAB engine is served by a thread. Threads don't have methods
// which can be called. So we need to send messages to that thread
// by using notifyAll. In the meantime NO OTHER methods is allowed to
// access our thread (engine) so we lock everything up.
private void lockEngineLock(){
synchronized(this){
while (lockEngineB==true){
try { //System.out.println("lockEngineLock locked");
wait();} // wait until last command is finished
catch (InterruptedException e) { }
}
//now lockEngineB is false
lockEngineB = true;
}
} // end lockEngine
private synchronized void releaseEngineLock(){
lockEngineB = false;
notifyAll();
}
////////////////////////////////////////////////////////////////////////////////
// The MATLAB engine is served by a thread. Threads don't have methods
// which can be called directly. If we send a command that returns data
// back to the calling function e.g. engGetArray("array"), we'll notify
// the main thread to get the data from matlab. Since the data is collected
// in another thread, we don't know exactly when the data is available, since
// this is a concurrent situation.
// The solution is simple: I always use a locking-mechanism to wait for the
// data. The main thread will release the lock and the calling method can
// return the data.
//
// Steps:
// 1. a method that returns data calls the locking method
// 2. notify the thread to call matlab
// 3. wait for the returned data
// 4. after the thread itself got the data it releases the locks method
// 5. return data
private synchronized void lockWaitForValue(){
lockWaitForValueB = true;
}
private void WaitForValue(){
synchronized(this){
while (lockWaitForValueB==true){
try { //System.out.println("lockWaitForValue locked");
wait();} // wait for return value
catch (InterruptedException e) { }
}
}
//System.out.println("WaitForValue released");
} // end waitForValue
private synchronized void releaseWaitForValue(){
lockWaitForValueB = false;
notifyAll();
}
////////////////////////////////////////////////////////////////////////////////
//// Utility methods ////
// Convert an n*n double array to n*1 String vector
private String[] double2String(double[][] d)
{
String encodeS[]=new String[d.length]; // String vector
// for all rows
for (int n=0; n<d.length; n++){
byte b[] = new byte[d[n].length];
// convert row from double to byte
for (int i=0; i<d[n].length ;i++) b[i]=(byte)d[n][i];
// convert byte to String
try { encodeS[n] = new String(b, "UTF8");}
catch (UnsupportedEncodingException e) {}
}
return encodeS;
} // end double2String
} // end class JMatLink
N>А то если Java, то не вполне понятно, почему "из другого класса ничего не получается"
N>Есть у меня резонное ощущение, что ты пытаешься напрямую вызвать DLL из Java путем простой декларации native-метода без описания его реализации.
N>Дай пожалуйста пример кода и stack trace ошибки на этом коде.
Это работает.
А когда я в сервлете выполняю следующие действия:
JMatLink engine=new JMatLink();
engine.engOpenSingleUse();
engine.engEvalString("m=2");
engine.engClose();
выкидывается след. ошибка
java.lang.UnsatisfiedLinkError: engOpenSingleUseNATIVE
at beans.JMatLink.engOpenSingleUseNATIVE(Native Method)
at beans.JMatLink.run(JMatLink.java:867)
at java.lang.Thread.run(Thread.java:534)
причем если я создаю какой-нить класс, и делаю в нем метод который вызывает эти ф-ии, а потм в сервлете создаю объект этого класса и вызываю этот метод — та же история
