From 223c303e1ee1a4d83a9bf37081da0bbd4687f9e4 Mon Sep 17 00:00:00 2001
From: zcy <290198252@qq.com>
Date: Wed, 23 Mar 2022 22:01:22 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0cpu=E5=8D=A0=E6=9C=89?=
 =?UTF-8?q?=E7=8E=87=E7=9B=91=E6=8E=A7?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 general/src/function/cpu_usage.cpp | 68 ++++++++++++++++++++++++++++++
 general/src/function/cpu_usage.h   | 56 ++++++++++++++++++++++++
 2 files changed, 124 insertions(+)
 create mode 100644 general/src/function/cpu_usage.cpp
 create mode 100644 general/src/function/cpu_usage.h

diff --git a/general/src/function/cpu_usage.cpp b/general/src/function/cpu_usage.cpp
new file mode 100644
index 0000000..2a00024
--- /dev/null
+++ b/general/src/function/cpu_usage.cpp
@@ -0,0 +1,68 @@
+
+#include "cpu_usage.h"
+
+float CPUusage::get_cpu_usage()
+{
+	FILETIME now;
+	FILETIME creation_time;
+	FILETIME exit_time;
+	FILETIME kernel_time;
+	FILETIME user_time;
+	int64_t system_time;
+	int64_t time;
+	int64_t system_time_delta;
+	int64_t time_delta;
+	DWORD exitcode;
+	float cpu = -1;
+ 
+	if (!_hProcess) 
+        return -1;
+	GetSystemTimeAsFileTime(&now);
+	//判断进程是否已经退出
+	GetExitCodeProcess(_hProcess, &exitcode);  
+	if (exitcode != STILL_ACTIVE) {
+		clear();
+		return -1;
+	}
+	//计算占用CPU的百分比
+	if (!GetProcessTimes(_hProcess, &creation_time, &exit_time, &kernel_time, &user_time))
+	{
+		clear();
+		return -1;
+	}
+	system_time = (FileTime2UTC(&kernel_time) + FileTime2UTC(&user_time))
+		/ _processor;
+	time = FileTime2UTC(&now);
+	//判断是否为首次计算
+	if ((_last_system_time == 0) || (_last_time == 0))
+	{
+		_last_system_time = system_time;
+		_last_time = time;
+		return -2;
+	}
+	system_time_delta = system_time - _last_system_time;
+	time_delta = time - _last_time;
+	if (time_delta == 0) {
+		return -1;
+	}
+	cpu = (float)system_time_delta * 100 / (float)time_delta;
+	_last_system_time = system_time;
+	_last_time = time;
+	return cpu;
+}
+ 
+CPUusage::uint64_t CPUusage::FileTime2UTC(const FILETIME* ftime)
+{
+	LARGE_INTEGER li;
+ 
+	li.LowPart = ftime->dwLowDateTime;
+	li.HighPart = ftime->dwHighDateTime;
+	return li.QuadPart;
+}
+ 
+int CPUusage::get_processor_number()
+{
+	SYSTEM_INFO info;
+	GetSystemInfo(&info);
+	return info.dwNumberOfProcessors;
+}
\ No newline at end of file
diff --git a/general/src/function/cpu_usage.h b/general/src/function/cpu_usage.h
new file mode 100644
index 0000000..c28c7cb
--- /dev/null
+++ b/general/src/function/cpu_usage.h
@@ -0,0 +1,56 @@
+#include <Windows.h>
+//原理：调用GetProcessTimes()，并与上次调用得到的结果相减，即得到某段时间内CPU的使用时间
+//C++ 获取特定进程规定CPU使用率  原文：http://blog.csdn.net/liuqx97bb/article/details/52058657
+class CPUusage { 
+private:
+ 	typedef long long          int64_t;
+ 	typedef unsigned long long uint64_t;
+	HANDLE _hProcess;  
+	int _processor;    //cpu数量  
+	int64_t _last_time;         //上一次的时间  
+	int64_t _last_system_time;  
+ 
+ 
+	// 时间转换  
+	uint64_t FileTime2UTC(const FILETIME* ftime);
+ 
+	// 获得CPU的核数  
+	int get_processor_number();
+ 
+	//初始化
+	void init()
+	{
+		_last_system_time = 0;
+		_last_time = 0;
+		_hProcess = 0;
+	}
+ 
+	//关闭进程句柄
+	void clear()
+	{
+		if (_hProcess) {
+			CloseHandle(_hProcess);
+			_hProcess = 0;
+		}
+	}
+ 
+public:
+	CPUusage(DWORD ProcessID) { 
+		init(); 
+		_processor = get_processor_number();
+		setpid(ProcessID);
+	}
+	CPUusage() { init(); _processor = get_processor_number(); }
+	~CPUusage() { clear(); }
+ 
+	//返回值为进程句柄，可判断OpenProcess是否成功
+	HANDLE setpid(DWORD ProcessID) { 
+		clear();    //如果之前监视过另一个进程，就先关闭它的句柄
+		init(); 
+		return _hProcess= OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, false, ProcessID); 
+	}
+ 
+	//-1 即为失败或进程已退出； 如果成功，首次调用会返回-2（中途用setpid更改了PID后首次调用也会返回-2）
+ 	float get_cpu_usage();  
+};
+