Highcharts动态曲线图(使用jna监视cpu使用率)

阅读更多

1、CPU使用率获取，因为我要用JNA调用，所以用c++调用windowAPI，编译成Dll文件；dll的代码如下：

// DllTest.cpp : Defines the exported functions for the DLL application.
//

#include "stdafx.h"
#include "iostream"
#include "stdafx.h"
#define _WIN32_WINNT   0x0501
#include 
#define MYLIBAPI  extern   "C"     __declspec( dllexport ) 

/*
要返回的函数声明
*/
MYLIBAPI void getCpuInfo(int wait,double* d);

/*
函数的定义
*/
//转换FILETIME类型
__int64 CompareFileTime ( FILETIME time1, FILETIME time2 )
{
	__int64 a = time1.dwHighDateTime << 32 | time1.dwLowDateTime ;
	__int64 b = time2.dwHighDateTime << 32 | time2.dwLowDateTime ;

	return   (b - a);
}

//函数的实体
/*wait是统计多长时间内的cpu使用率
d是返回的数组
*/
void getCpuInfo(int wait,double* d){
	HANDLE hEvent;
	BOOL res ;

	FILETIME preidleTime;
	FILETIME prekernelTime;
	FILETIME preuserTime;

	FILETIME idleTime;
	FILETIME kernelTime;
	FILETIME userTime;

	res = GetSystemTimes( &idleTime, &kernelTime, &userTime );


	preidleTime = idleTime;
	prekernelTime = kernelTime;
	preuserTime = userTime ;

	hEvent = CreateEvent (NULL,FALSE,FALSE,NULL); // 初始值为 nonsignaled ，并且每次触发后自动设置为nonsignaled

	WaitForSingleObject( hEvent,wait); //等待500毫秒
	res = GetSystemTimes( &idleTime, &kernelTime, &userTime );
	int idle = CompareFileTime( preidleTime,idleTime);
	int kernel = CompareFileTime( prekernelTime, kernelTime);
	int user = CompareFileTime(preuserTime, userTime);
	//cpu使用率的计算
        double cpu = (kernel +user - idle) *100.0/(kernel+user);
	//cpu空闲率的计算
        double cpuidle = ( idle) *100.0/(kernel+user);

	d[0] =cpu;
	d[1] = cpuidle;
}

 2、JNA代码的定义

package com.ligson.jna;

import com.sun.jna.Library;
import com.sun.jna.Native;

//声明
interface MyDllLib extends Library {
    /*
     DllTest.dll是我编译后的dll文件，放在项目的根目录
     */
    MyDllLib INSTANCE = (MyDllLib) Native.loadLibrary("DllTest.dll", MyDllLib.class);
    /*
    这个与c++中函数的定义一样，唯一不同的double[] d没用用指针，但是数组的本身就是指针，
     */
    public void getCpuInfo(int wait, double[] d);
}

public class GetCpuInfo {
    static MyDllLib myDllLib = MyDllLib.INSTANCE;

    public static double getCpu(int wait) {
        //声明返回值
        double[] d = new double[2];
        myDllLib.getCpuInfo(wait,d);
        return d[0];
    }
}

3、Web环境用grails框架，grails框架语法简单，各种东西定义都很方便，Controller的定义

package hf

import grails.converters.JSON

class CpuMonitorController {

  static List list = [];
  static Map result = [:];
  def index = {
    render(view: 'cpu');
  }

  def getCpuInfo = {
    double d = com.ligson.jna.GetCpuInfo.getCpu(500);
    def l = [:];
    l.x = new Date().getTime();
    l.y = d;
    list.add(l);

    result.x = l.x;
    result.y = l.y;
    //返回json格式,x轴以时间为准，y轴以cpu占有率为准
    return render(result as JSON);
  }
}

 4、cpu.gsp的代码：

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 12-1-10
  Time: 下午7:49
  To change this template use File | Settings | File Templates.
--%>

<%@ page contentType="text/html;charset=UTF-8" %>


  
  
  
  
  
  
  
  
  



  

 5、漂亮的效果图：

6、我的dll库文件在下面，欢迎大家下载使用

 

 

• 
• 大小: 38 KB

• DllTest.zip (11.8 KB)
• 下载次数: 267

• 查看图片附件