package com;

import com.Struct.MEMORYSTATUS;

/**
 * @author ╱―★神★―╲
 * @name  内存优化
 */
public class Ncyh {
	
	public static double execute() {
		int[] pids = new int[1024];
		int[] retLen = new int[1];
		//枚举进程
		Win32.Psapi.EnumProcesses(pids, 1024 * 4 ,retLen);
		System.out.println("当前进程数 =  " + retLen[0] / 4);
		
		MEMORYSTATUS ms = new MEMORYSTATUS();
		Win32.Kernel32.GlobalMemoryStatus(ms);
		// k = 所有进程所占用的内存大小
		int k  = ms.dwTotalPhys - ms.dwAvailPhys;
		// 遍历每一个进程,进行内存释放
		for(int i=0;i< retLen[0] / 4 ; i++) {
			int hProcess = Win32.Kernel32.OpenProcess(2035711, false,pids[i]);
			Win32.Kernel32.SetProcessWorkingSetSize(hProcess, -1, -1);
			Win32.Kernel32.CloseHandle(hProcess);
		}
		Win32.Kernel32.GlobalMemoryStatus(ms);
		// 释放前的内存 减去 释放后的内存。计算本次释放了多少内存
		double rDb = (k - (ms.dwTotalPhys - ms.dwAvailPhys))/1024.0/1024.0 ;
		return   Math.round(  rDb * 100 ) / 100.0;
	}
	
	
	
	public static void main(String[] args) {
		
		System.out.println( "本次释放内存 =  " + Ncyh.execute() +" MB");
	
		
	}
	
}