基于QT的CPU、内存监控功能的控件

#pragma execution_character_set("utf-8") #include "cpumemorylabel.h" #include "qtimer.h" #include "qprocess.h" #ifdef Q_OS_WIN #ifndef _WIN32_WINNT #define _WIN32_WINNT 0x502 #endif #include "windows.h" #endif #define MB (1024 * 1024) #define KB (1024) CpuMemoryLabel::CpuMemoryLabel(QWidget *parent) : QLabel(parent) { totalNew = idleNew = totalOld = idleOld = 0; cpuPercent = 0; memoryPercent = 0; memoryAll = 0; memoryUse = 0; timerCPU = new QTimer(this); connect(timerCPU, SIGNAL(timeout()), this, SLOT(getCPU())); timerMemory = new QTimer(this); connect(timerMemory, SIGNAL(timeout()), this, SLOT(getMemory())); process = new QProcess(this); connect(process, SIGNAL(readyRead()), this, SLOT(readData())); } CpuMemoryLabel::~CpuMemoryLabel() { stop(); } void CpuMemoryLabel::start(int interval) { getCPU(); getMemory(); timerCPU->start(interval); timerMemory->start(interval + 200); } void CpuMemoryLabel::stop() { timerCPU->stop(); timerMemory->stop(); } void CpuMemoryLabel::getCPU() { #ifdef Q_OS_WIN static FILETIME preidleTime; static FILETIME prekernelTime; static FILETIME preuserTime; FILETIME idleTime; FILETIME kernelTime; FILETIME userTime; GetSystemTimes(&idleTime, &kernelTime, &userTime); quint64 a, b; quint64 idle, kernel, user; a = (preidleTime.dwHighDateTime << 31) | preidleTime.dwLowDateTime; b = (idleTime.dwHighDateTime << 31) | idleTime.dwLowDateTime; idle = b - a; a = (prekernelTime.dwHighDateTime << 31) | prekernelTime.dwLowDateTime; b = (kernelTime.dwHighDateTime << 31) | kernelTime.dwLowDateTime; kernel = b - a; a = (preuserTime.dwHighDateTime << 31) | preuserTime.dwLowDateTime; b = (userTime.dwHighDateTime << 31) | userTime.dwLowDateTime; user = b - a; cpuPercent = (kernel + user - idle) * 100 / (kernel + user); preidleTime = idleTime; prekernelTime = kernelTime; preuserTime = userTime ; setData(); #else if (process->state() == QProcess::NotRunning) { totalNew = idleNew = 0; process->start("cat /proc/stat"); } #endif } void CpuMemoryLabel::getMemory() { #ifdef Q_OS_WIN MEMORYSTATUSEX statex; statex.dwLength = sizeof(statex); GlobalMemoryStatusEx(&statex); memoryPercent = statex.dwMemoryLoad; memoryAll = statex.ullTotalPhys / MB; memoryFree = statex.ullAvailPhys / MB; memoryUse = memoryAll - memoryFree; setData(); #else if (process->state() == QProcess::NotRunning) { process->start("cat /proc/meminfo"); } #endif } void CpuMemoryLabel::readData() { while (!process->atEnd()) { QString s = QLatin1String(process->readLine()); if (s.startsWith("cpu")) { QStringList list = s.split(" "); idleNew = list.at(5).toUInt(); foreach (QString value, list) { totalNew += value.toUInt(); } quint64 total = totalNew - totalOld; quint64 idle = idleNew - idleOld; cpuPercent = 100 * (total - idle) / total; totalOld = totalNew; idleOld = idleNew; break; } else if (s.startsWith("MemTotal")) { s = s.replace(" ", ""); s = s.split(":").at(1); memoryAll = s.left(s.length() - 3).toUInt() / KB; } else if (s.startsWith("MemFree")) { s = s.replace(" ", ""); s = s.split(":").at(1); memoryFree = s.left(s.length() - 3).toUInt() / KB; } else if (s.startsWith("Buffers")) { s = s.replace(" ", ""); s = s.split(":").at(1); memoryFree += s.left(s.length() - 3).toUInt() / KB; } else if (s.startsWith("Cached")) { s = s.replace(" ", ""); s = s.split(":").at(1); memoryFree += s.left(s.length() - 3).toUInt() / KB; memoryUse = memoryAll - memoryFree; memoryPercent = 100 * memoryUse / memoryAll; break; } } setData(); } void CpuMemoryLabel::setData() { cpuPercent = (cpuPercent < 0 ? 0 : cpuPercent); cpuPercent = (cpuPercent > 100 ? 0 : cpuPercent); QString msg = QString("CPU %1% Mem %2% ( 已用 %3 MB / 共 %4 MB )") .arg(cpuPercent).arg(memoryPercent).arg(memoryUse).arg(memoryAll); this->setText(msg); emit textChanged(msg); emit valueChanged(cpuPercent, memoryPercent, memoryAll, memoryUse, memoryFree); } QSize CpuMemoryLabel::sizeHint() const { return QSize(300, 30); } QSize CpuMemoryLabel::minimumSizeHint() const { return QSize(30, 10); }