Qt 获取Windows内存信息

通过调用Windows API来获取Windows 内存信息，并显示在界面上，通过与Windows 内存管理器对比可以看到结果是正确的。

实现的小工具的界面效果与内存管理器对比如下：

实现的完整代码：

#pragma execution_character_set("utf-8")#ifndef QMEMORYINFO_H#define QMEMORYINFO_H#include <QtWidgets/QWidget>#include <QLabel>#include <QLineEdit>#include <QTimer>class QMemoryInfo : public QWidget{Q_OBJECTpublic:QMemoryInfo(QWidget *parent = 0);~QMemoryInfo();private:void updateInfo();QTimer *m_timer;QLabel *m_memoryUsedLabel;QLabel *m_totalPhysLabel;QLabel *m_availPhysLabel;QLabel *m_totalPageFileLabel;QLabel *m_availPageFileLabel;QLabel *m_totalVirtualLabel;QLabel *m_availVirtualLabel;QLabel *m_availExVirtualLabel;QLineEdit *m_memoryUsedEdit;QLineEdit *m_totalPhysEdit;QLineEdit *m_availPhysEdit;QLineEdit *m_totalPageFileEdit;QLineEdit *m_availPageFileEdit;QLineEdit *m_totalVirtualEdit;QLineEdit *m_availVirtualEdit;QLineEdit *m_availExVirtualEdit;};#endif // QMEMORYINFO_H

#include "qmemoryinfo.h"#include <QGridLayout>#include <windows.h>#include <sysinfoapi.h>QMemoryInfo::QMemoryInfo(QWidget *parent): QWidget(parent){m_memoryUsedLabel = new QLabel(this);m_totalPhysLabel = new QLabel(this);m_availPhysLabel = new QLabel(this);m_totalPageFileLabel = new QLabel(this);m_availPageFileLabel = new QLabel(this);m_totalVirtualLabel = new QLabel(this);m_availVirtualLabel = new QLabel(this);m_availExVirtualLabel = new QLabel(this);m_memoryUsedEdit = new QLineEdit(this);m_totalPhysEdit = new QLineEdit(this);m_availPhysEdit = new QLineEdit(this);m_totalPageFileEdit = new QLineEdit(this);m_availPageFileEdit = new QLineEdit(this);m_totalVirtualEdit = new QLineEdit(this);m_availVirtualEdit = new QLineEdit(this);m_availExVirtualEdit = new QLineEdit(this);m_memoryUsedLabel->setText(QObject::tr("内存使用率:"));m_totalPhysLabel->setText("总物理内存:");m_availPhysLabel->setText("可用物理内存:");m_totalPageFileLabel->setText("系统提交总数:");m_availPageFileLabel->setText("系统提交数:");m_totalVirtualLabel->setText("总虚拟内存:");m_availVirtualLabel->setText("可用虚拟内存:");m_availExVirtualLabel->setText("可用扩展虚拟:");m_memoryUsedEdit->setReadOnly(true);m_totalPhysEdit->setReadOnly(true);m_availPhysEdit->setReadOnly(true);m_totalPageFileEdit->setReadOnly(true);m_availPageFileEdit->setReadOnly(true);m_totalVirtualEdit->setReadOnly(true);m_availVirtualEdit->setReadOnly(true);m_availExVirtualEdit->setReadOnly(true);QGridLayout *pLay = new QGridLayout(this);int iLine = 0;pLay->addWidget(m_memoryUsedLabel, iLine, 0, 1, 1);pLay->addWidget(m_memoryUsedEdit, iLine, 1, 1, 3);iLine++;pLay->addWidget(m_totalPhysLabel, iLine, 0, 1, 1);pLay->addWidget(m_totalPhysEdit, iLine, 1, 1, 3);iLine++;pLay->addWidget(m_availPhysLabel, iLine, 0, 1, 1);pLay->addWidget(m_availPhysEdit, iLine, 1, 1, 3);iLine++;pLay->addWidget(m_totalPageFileLabel, iLine, 0, 1, 1);pLay->addWidget(m_totalPageFileEdit, iLine, 1, 1, 3);iLine++;pLay->addWidget(m_availPageFileLabel, iLine, 0, 1, 1);pLay->addWidget(m_availPageFileEdit, iLine, 1, 1, 3);iLine++;pLay->addWidget(m_totalVirtualLabel, iLine, 0, 1, 1);pLay->addWidget(m_totalVirtualEdit, iLine, 1, 1, 3);iLine++;pLay->addWidget(m_availVirtualLabel, iLine, 0, 1, 1);pLay->addWidget(m_availVirtualEdit, iLine, 1, 1, 3);iLine++;pLay->addWidget(m_availExVirtualLabel, iLine, 0, 1, 1);pLay->addWidget(m_availExVirtualEdit, iLine, 1, 1, 3);m_timer = new QTimer(this);connect(m_timer, &QTimer::timeout, this, &QMemoryInfo::updateInfo);m_timer->start(100);}QMemoryInfo::~QMemoryInfo(){}void QMemoryInfo::updateInfo(){MEMORYSTATUSEX memoryInfo;memoryInfo.dwLength = sizeof(memoryInfo);GlobalMemoryStatusEx(&memoryInfo);UINT mb = 1024 * 1024;m_memoryUsedEdit->setText(QString::number(memoryInfo.dwMemoryLoad).append("%"));m_totalPhysEdit->setText(QString::number(memoryInfo.ullTotalPhys / mb));m_availPhysEdit->setText(QString::number(memoryInfo.ullAvailPhys / mb));m_totalPageFileEdit->setText(QString::number(memoryInfo.ullTotalPageFile / mb));m_availPageFileEdit->setText(QString::number(memoryInfo.ullTotalPageFile / mb - memoryInfo.ullAvailPageFile / mb));m_totalVirtualEdit->setText(QString::number(memoryInfo.ullTotalVirtual / mb));m_availVirtualEdit->setText(QString::number(memoryInfo.ullAvailVirtual / mb));m_availExVirtualEdit->setText(QString::number(memoryInfo.ullAvailExtendedVirtual / mb));update();}

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源码下载：http://download.csdn.net/detail/u011417605/9538726