Qt 获取系统内存使用率，CPU使用率，硬盘容量（windows、linux都可用）
作者：互联网
我写了个获取系统资源的类，通过宏定义的方式区分了linux下和windows下各运行不同的代码。
头文件：
1 #ifndef RESOURCE_MINITOR_H
2 #define RESOURCE_MINITOR_H
3 #include <QObject>
4 #include <QTimer>
5 #include <QProcess>
6 #include <QDebug>
7 #include <QString>
8 #if defined(Q_OS_LINUX)
9 #include "sys/statfs.h"
10 #else
11 #pragma comment(lib,"Kernel32.lib")
12 #pragma comment(lib,"Psapi.lib")
13 #include <windows.h>
14 #include <tlhelp32.h>
15 #include<direct.h>
16 #include<winternl.h>
17 #include <psapi.h>
18 //#include <atlconv.h>
19 #include <cmath>
20 #include <string.h>
21 #endif
22
23 class MySysInfo : public QObject
24 {
25 Q_OBJECT
26 public:
27 explicit MySysInfo(QObject *parent = nullptr);
28 private slots:
29 void GetResource();
30 public:
31 bool GetMemUsage(double &nMemTotal,double &nMemUsed);
32 bool GetNetUsage();
33 bool GetDiskSpeed();
34 bool GetCpuUsage(double &nCpuRate);
35 bool GetdiskSpace(unsigned long &lFreeAll,unsigned long &lTotalAll);
36 bool GetPathSpace(const QString & path);
37 private:
38 const int m_timer_interval__ = 1000;
39 QTimer monitor_timer__;
40 double m_send_bytes__ = 0;
41 double m_recv_bytes__ = 0;
42 double m_disk_read__ = 0;
43 double m_disk_write__ = 0;
44 double m_cpu_total__ = 0;
45 double m_cpu_use__ = 0;
46 };
47 #endif // RESOURCE_MINITOR_H
源文件：
1 #include "mysysinfo.h"
2 MySysInfo::MySysInfo(QObject *parent) : QObject(parent)
3 {
4 connect(&monitor_timer__, &QTimer::timeout, this, &MySysInfo::GetResource);
5 monitor_timer__.start(m_timer_interval__);
6 }
7 void MySysInfo::GetResource()
8 {
9 double nCpuRate = 0;
10 GetCpuUsage(nCpuRate);
11 GetDiskSpeed();
12 double nMemTotal;
13 double nMemUsed;
14 GetMemUsage(nMemTotal,nMemUsed);
15 GetNetUsage();
16 unsigned long lFreeAll;
17 unsigned long lTotalAll;
18 GetdiskSpace(lFreeAll,lTotalAll);
19 GetPathSpace("/");
20 qDebug()<<"\n";
21 }
22 bool MySysInfo::GetMemUsage(double &nMemTotal,double &nMemUsed)
23 {
24 #if defined(Q_OS_LINUX)
25 QProcess process;
26 process.start("free -m"); //使用free完成获取
27 process.waitForFinished();
28 process.readLine();
29 QString str = process.readLine();
30 str.replace("\n","");
31 str.replace(QRegExp("( ){1,}")," ");//将连续空格替换为单个空格 用于分割
32 auto lst = str.split(" ");
33 if(lst.size() > 6)
34 {
35 qDebug("mem total:%.0lfMB free:%.0lfMB",lst[1].toDouble(),lst[6].toDouble());
36 nMemTotal = lst[1].toDouble();
37 nMemUsed = nMemTotal-lst[6].toDouble();
38 return true;
39 }
40 else
41 {
42 return false;
43 }
44 #else
45 MEMORYSTATUSEX memsStat;
46 memsStat.dwLength = sizeof(memsStat);
47 if(!GlobalMemoryStatusEx(&memsStat))//如果获取系统内存信息不成功，就直接返回
48 {
49 return false;
50 }
51 double nMemFree = memsStat.ullAvailPhys/( 1024.0*1024.0 );
52 nMemTotal = memsStat.ullTotalPhys/( 1024.0*1024.0 );
53 nMemUsed= nMemTotal- nMemFree;
54 qDebug("windows:mem total:%.0lfMB,use:%.0lfMB",nMemTotal,nMemUsed);
55 return true;
56 #endif
57 }
58 bool MySysInfo::GetNetUsage()
59 {
60 #if defined(Q_OS_LINUX)
61 QProcess process;
62 process.start("cat /proc/net/dev"); //读取文件/proc/net/dev获取网络收发包数量，再除取样时间得到网络速度
63 process.waitForFinished();
64 process.readLine();
65 process.readLine();
66 while(!process.atEnd())
67 {
68 QString str = process.readLine();
69 str.replace("\n","");
70 str.replace(QRegExp("( ){1,}")," ");
71 auto lst = str.split(" ");
72 if(lst.size() > 9 && lst[0] == "enp2s0:")
73 {
74 double recv = 0;
75 double send = 0;
76 if(lst.size() > 1)
77 recv = lst[1].toDouble();
78 if(lst.size() > 9)
79 send = lst[9].toDouble();
80 qDebug("%s 接收速度:%.0lfbyte/s 发送速度:%.0lfbyte/s",lst[0].toStdString().c_str(),(recv - m_recv_bytes__) / (m_timer_interval__ / 1000.0),(send - m_send_bytes__) / (m_timer_interval__ / 1000.0));
81 m_recv_bytes__ = recv;
82 m_send_bytes__ = send;
83 }
84 }
85 #endif
86 return true;
87 }
88 #if defined(Q_OS_WIN32)
89 __int64 Filetime2Int64(const FILETIME* ftime)
90 {
91 LARGE_INTEGER li;
92 li.LowPart = ftime->dwLowDateTime;
93 li.HighPart = ftime->dwHighDateTime;
94 return li.QuadPart;
95 }
96
97 __int64 CompareFileTime(FILETIME preTime,FILETIME nowTime)
98 {
99 return Filetime2Int64(&nowTime) - Filetime2Int64(&preTime);
100 }
101 #endif
102 bool MySysInfo::GetCpuUsage(double &nCpuRate)
103 {
104 nCpuRate = -1;
105 #if defined(Q_OS_LINUX)
106 QProcess process;
107 process.start("cat /proc/stat");
108 process.waitForFinished();
109 QString str = process.readLine();
110 str.replace("\n","");
111 str.replace(QRegExp("( ){1,}")," ");
112 auto lst = str.split(" ");
113 if(lst.size() > 3)
114 {
115 double use = lst[1].toDouble() + lst[2].toDouble() + lst[3].toDouble();
116 double total = 0;
117 for(int i = 1;i < lst.size();++i)
118 total += lst[i].toDouble();
119 if(total - m_cpu_total__ > 0)
120 {
121 qDebug("cpu rate:%.2lf%%",(use - m_cpu_use__) / (total - m_cpu_total__) * 100.0);
122 m_cpu_total__ = total;
123 m_cpu_use__ = use;
124 nCpuRate = (use - m_cpu_use__) / (total - m_cpu_total__) * 100.0;
125 return true;
126 }
127 }
128 #else
129 HANDLE hEvent;
130 bool res;
131 static FILETIME preIdleTime;
132 static FILETIME preKernelTime;
133 static FILETIME preUserTime;
134 FILETIME idleTime;
135 FILETIME kernelTime;
136 FILETIME userTime;
137 res = GetSystemTimes(&idleTime,&kernelTime,&userTime);
138 preIdleTime = idleTime;
139 preKernelTime = kernelTime;
140 preUserTime = userTime;
141 hEvent = CreateEvent(nullptr,FALSE,FALSE,nullptr);//初始值为nonsignaled
142 WaitForSingleObject(hEvent,500);//等待500毫秒
143 res = GetSystemTimes(&idleTime,&kernelTime,&userTime);
144 long long idle = CompareFileTime(preIdleTime,idleTime);
145 long long kernel = CompareFileTime(preKernelTime,kernelTime);
146 long long user = CompareFileTime(preUserTime,userTime);
147 nCpuRate =ceil( 100.0*( kernel + user - idle ) / ( kernel + user ) );
148 qDebug()<<"windows:CPU use rate:"<<nCpuRate<<"%";
149 #endif
150 return true;
151 }
152 bool MySysInfo::GetDiskSpeed()
153 {
154 #if defined(Q_OS_LINUX)
155 QProcess process;
156 process.start("iostat -k -d");
157 process.waitForFinished();
158 process.readLine();
159 process.readLine();
160 process.readLine();
161 QString str = process.readLine();
162 str.replace("\n","");
163 str.replace(QRegExp("( ){1,}")," ");
164 auto lst = str.split(" ");
165 if(lst.size() > 5)
166 {
167 qDebug("disk read:%.0lfkb/s disk write:%.0lfkb/s",(lst[4].toDouble() - m_disk_read__ ) / (m_timer_interval__ / 1000.0),(lst[5].toDouble() - m_disk_write__) / (m_timer_interval__ / 1000.0));
168 m_disk_read__ = lst[4].toDouble();
169 m_disk_write__ = lst[5].toDouble();
170 return true;
171 }
172 #endif
173 return false;
174 }
175 bool MySysInfo::GetdiskSpace(unsigned long &lFreeAll,unsigned long &lTotalAll)
176 {
177 #if defined(Q_OS_LINUX)
178 QProcess process;
179 process.start("df -k");
180 process.waitForFinished();
181 process.readLine();
182 while(!process.atEnd())
183 {
184 QString str = process.readLine();
185 if(str.startsWith("/dev/sda"))
186 {
187 str.replace("\n","");
188 str.replace(QRegExp("( ){1,}")," ");
189 auto lst = str.split(" ");
190 if(lst.size() > 5)
191 qDebug("挂载点:%s 已用:%.0lfMB 可用:%.0lfMB",lst[5].toStdString().c_str(),lst[2].toDouble()/1024.0,lst[3].toDouble()/1024.0);
192 lFreeAll += lst[2].toDouble()/1024.0;
193 lTotalAll += lst[3].toDouble()/1024.0+lFreeAll;
194 }
195 }
196 #else
197
198 static char path[_MAX_PATH];//存储当前系统存在的盘符
199 int curdrive = _getdrive();
200 lFreeAll = 0UL;
201 lTotalAll = 0UL;
202 for(int drive = 1; drive <= curdrive; drive++ )//遍历所有盘符
203 {
204 if( !_chdrive( drive ) )
205 {
206 sprintf(path, "%c:\\", drive + 'A' - 1 );
207 ULARGE_INTEGER caller, total, free;
208 WCHAR wszClassName[_MAX_PATH];
209 memset(wszClassName,0,sizeof(wszClassName));
210 MultiByteToWideChar(CP_ACP,0,path,strlen(path)+1,wszClassName,
211 sizeof(wszClassName)/sizeof(wszClassName[0]));
212 if (GetDiskFreeSpaceEx(wszClassName, &caller, &total, &free) == 0)
213 {
214 qDebug()<<"GetDiskFreeSpaceEx Filed!";
215 return false;
216 }
217
218 double dTepFree = free.QuadPart/( 1024.0*1024.0 );
219 double dTepTotal = total.QuadPart/( 1024.0*1024.0 );
220 qDebug()<<"Get Windows Disk Information:"<<path<<"--free:"<<dTepFree<<"MB,--total:"<<dTepTotal<<"MB";
221 lFreeAll += ceil(dTepFree);
222 lTotalAll += ceil(dTepTotal);
223 }
224 }
225 qDebug("Total disk capacity:%lu MB,Free disk capacity:%lu MB",lTotalAll,lFreeAll);
226 #endif
227 return true;
228 }
229 bool MySysInfo::GetPathSpace(const QString & path)
230 {
231 #if defined(Q_OS_LINUX)
232 struct statfs diskInfo;//需要#include "sys/statfs.h"
233 statfs(path.toUtf8().data(), &diskInfo);
234 qDebug("%s 总大小:%.0lfMB 可用大小:%.0lfMB",path.toStdString().c_str(),(diskInfo.f_blocks * diskInfo.f_bsize)/1024.0/1024.0,(diskInfo.f_bavail * diskInfo.f_bsize)/1024.0/1024.0);
235 #endif
236 return true;
237 }
标签：__,include,Qt,process,double,硬盘容量,lst,toDouble,使用率 来源： https://www.cnblogs.com/ybqjymy/p/13862489.html