在QT中为了扫描大量的Ip，通常需要将扫描Ip的任务放在一个单独的线程来完成，这样需要子类化QThread，重写其run()方法。从QThread类派生出一个ShellProcess的子类，该类的头文件代码如下：
#ifndef SHELLPROCESS_H
#define SHELLPROCESS_H
#include <QThread>
#include <QtCore/QStringList>
// Ping IP的线程子类
class ShellProcess : public QThread
{
Q_OBJECT
public:
explicit ShellProcess(QObject *parent = 0);
QStringList getIpRangle(); //获取需要扫描的IP列表
void setIpRange(QStringList ipRange); //设置需要扫描的IP列表
protected:
void run();
signals:
void commandSuccessed(QString ip);
void commandFailed(QString ip);
public slots:
private:
QStringList ipRange; //需要扫描的IP列表
};
#endif // SHELLPROCESS_H
ShellProcess类的实现代码如下：
#include "shellprocess.h"
#include <QtCore/QtDebug>
#include <QtCore/QProcess>
ShellProcess::ShellProcess(QObject *parent) :
QThread(parent)
{
}
QStringList ShellProcess::getIpRangle()
{
return this->ipRange;
}
void ShellProcess::setIpRange(QStringList ipRange)
{
this->ipRange = ipRange;
}
void ShellProcess::run()
{
QString ip;
//依次扫描Ip列表中的各个IP
foreach( ip, ipRange )
{
int exitCode;
//对每个Ip执行ping命令检测其是否在线
qDebug() << "ping " + ip << endl;
#ifdef Q_OS_WIN
QString strArg = "ping " + ip + " -n 1 -i 2";
exitCode = QProcess::execute(strArg);
#else
//其他平台(Linux或Mac)
exitCode = QProcess::execute("ping", QStringList() << "-c 1" << "-t 2" << ip));
#endif
if(0 == exitCode)
{
//it's alive
qDebug() << "shell ping " + ip + " sucessed!";
//发射该IP在线的信号
emit commandSuccessed(ip);
} else {
qDebug() << "shell ping " + ip + " failed!";
//发射IP离线的信号
emit commandFailed(ip);
}
}
}
在实际编程中可以这样使用ShellProcess类：
#define THREAD_SIZE 10 //线程数
ShellProcess *shellProcess;
for(int i=0;i<THREAD_SIZE;i++){
shellProcess= new ShellProcess(this);
connect(shellProcess, SIGNAL(commandSuccessed(QString)), this, SLOT(slot_onCommandSuccessed(QString)));
connect(shellProcess, SIGNAL(commandFailed(QString)), this, SLOT(slot_onCommandFailed(QString)));
connect(shellProcess, SIGNAL(finished()), shellProcess, SLOT(deleteLater()));
//设置每个线程的Ip扫描范围，一共10个线程
shellProcess->setIpRange(ip_in_thread[i]);
//启动线程
shellProcess->start();
}
