/**
 * Increment 1 every 1 second and keep the output in the 
 * same line on the Console.
 */
package com.console;

/**
 * Increment 1 every 1 second.
 * @author jiafanz
 */
public class IncrementOneEvery1Sec
{
    //the right command line usage message
    private final static String MESSAGE = "Usage: java <path_and_filename> \n"
        + "\t(to execute the class file)\n\n"
        + "where path_and_filename indicates the system file path and name.\n\n"
        + "e.g. java IncrementOneEvery1Sec \r\n";
    
    private static int value = 0;
    
    /**
     * This is a native method to invoke a c program.
     * @param value the vlaue to be printed
     */
    public native void printConsole(int value);
    
    
    /**
     * Load the library.
     * 
     * Then the runtime system later loads this shared library
     * into the Java class that requires it.
     * 
     * a static initializer.
     * 
     * e.g.
     * Solaris system converts "hello" to "libhello.so"
     * Windows system converts "hello" to "hello.dll" 
     */
    static
    {
        System.loadLibrary("printconsole");
    }
    
    /**
     * Main method entry point.
     * @param args the main method argument
     */
    public static void main(String[] args)
    {
        if (args.length != 0)
        {
            // user provided wrong parameters
            System.err.println("wrong parameter length.");
            System.out.println(MESSAGE);
            System.exit(1);
        }
        
        IncrementOneEvery1Sec test = new IncrementOneEvery1Sec();
        try
        {
            while (true)
            {
                Thread.sleep(1000);
                test.printConsole(++value);
            }
        }
        catch (InterruptedException ex)
        {
            ex.printStackTrace();
        }
    }
}

#include <jni.h>
#include "com_console_IncrementOneEvery1Sec.h"
#include <stdio.h>
#include <stdlib.h>

JNIEXPORT void JNICALL 
Java_com_console_IncrementOneEvery1Sec_printConsole(JNIEnv *env, jobject obj, jint value)
{
  system("cls");
  printf("%d\n", value);
  return;
}

cl -IC:\jdk1.5.0_06\include -IC:\jdk1.5.0_06\include\win32 -LD IncrementOneEvery1SecImp.c -Feprintconsole.dll
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.507
Copyright (C) Microsoft Corporation.  All rights reserved.

IncrementOneEvery1SecImp.c
Microsoft (R) Incremental Linker Version 8.00.50727.42
Copyright (C) Microsoft Corporation.  All rights reserved.

/dll
/implib:printconsole.lib
/out:printconsole.dll
IncrementOneEvery1SecImp.obj
   Creating library printconsole.lib and object printconsole.exp

HenryShanley wrote:

能看出我是用心写的。。斑竹加分阿。

lisliefor wrote:
Haha , we have caught your essence !

zcjl wrote:
本来面目: [ běn lái miàn mù ]

1. true colors
2. true features

其它相关解释:
<for what they are>

例句与用法:
1. 他一掌了权就露出了本来面目.
Once he achieved power he showed (himself in) his true colours.

HenryShanley wrote:
What?

zcjl wrote:
本来面目: [ běn lái miàn mù ]

1. true colors
2. true features

其它相关解释:
<for what they are>

例句与用法:
1. 他一掌了权就露出了本来面目.
Once he achieved power he showed (himself in) his true colours.