做网站一年多少钱网络优化工程师主要负责什么工作

到官网下载qssh的源码QSsh-botan-1，使用qtcreator打开后，直接编译，即可得到qssh的库

 头文件将QSsh-botan-1\src\libs\ssh目录下的.h文件拷到include文件夹下，即为库头文件。

qssh有个问题，如果你将qssh的类放在子线程中调用，将获取不到服务器发送回来的数据。故只能放在主线程调用。如有需要从子线程调用的话，可通过在子线程发送信号来调用主线程的槽，从而调用到qssh的功能，使得qssh在主线程调用，即能正常使用。

封装如下：

// .h
#ifndef SSHCLIENT_H
#define SSHCLIENT_H
#include <qobject.h>
#include "sshconnection.h"
#include "sshremoteprocess.h"class SshClient : public QObject
{Q_OBJECT
public:SshClient();~SshClient();void ConnectToHost(const QString &host, const QString &user, const QString &pwd);void DisConnectFromHost();void SendCmd(const QByteArray &data);signals:void SendDataRecv(const QByteArray &data);void SendConnected(bool bConned);void SendShellStarted(bool bStarted);void SendRetMsg(const QString &msg);private slots:void OnConnected();void onConnectionError(QSsh::SshError);void OnShellStarted();void OnShellDataRecieved();void OnShellError();private:QString mIp;QString mUserName;QString mPwd;QSsh::SshConnection *mpConnection = Q_NULLPTR; // 连接ssh服务器QSharedPointer<QSsh::SshRemoteProcess> mpShell; // ssh的shell用于发送与回显消息
};#endif // SSHCLIENT_H// .cpp
#include <qcoreapplication.h>
#include "sshclient.h"
#include "log.h"SshClient::SshClient()
{}SshClient::~SshClient()
{DisConnectFromHost();
}void SshClient::ConnectToHost(const QString &host, const QString &username, const QString &pwd)
{QSsh::SshConnectionParameters params;params.setHost(host);params.setUserName(username);params.setPassword(pwd);params.authenticationType = QSsh::SshConnectionParameters::AuthenticationTypePassword;params.timeout = 10;//30;params.setPort(22);if(mpConnection == Q_NULLPTR){mpConnection = new QSsh::SshConnection(params, this); // TODO free this pointer!}connect(mpConnection, SIGNAL(connected()), SLOT(OnConnected()));connect(mpConnection, SIGNAL(error(QSsh::SshError)), SLOT(onConnectionError(QSsh::SshError)));mpConnection->disconnectFromHost();mpConnection->connectToHost();LOG_INFO("conneting to host:%s user:%s pwd:%s",qPrintable(host),qPrintable(username),qPrintable(pwd));
}void SshClient::DisConnectFromHost()
{if(mpShell){emit SendShellStarted(false);mpShell->close();mpShell.reset();}if(mpConnection != Q_NULLPTR){emit SendConnected(false);mpConnection->disconnectFromHost();delete mpConnection;mpConnection = Q_NULLPTR;}
}void SshClient::OnConnected()
{emit SendConnected(true);LOG_INFO("ssh is connected");mpShell = mpConnection->createRemoteShell();connect(mpShell.get(), SIGNAL(started()), SLOT(OnShellStarted()));connect(mpShell.get(), SIGNAL(readyReadStandardOutput()), SLOT(OnShellDataRecieved()));connect(mpShell.get(), SIGNAL(readyReadStandardError()), SLOT(OnShellError()));mpShell->start();
}void SshClient::onConnectionError(QSsh::SshError)
{QString errStr = mpConnection->errorString();emit SendRetMsg(QString::fromLocal8Bit("连接出错:%1").arg(errStr));LOG_ERROR("ssh connected err:%s",mpConnection->errorString().toLocal8Bit().data());//mpConnection->disconnectFromHost();// mpConnection->connectToHost();
}void SshClient::OnShellStarted()
{LOG_INFO("shell is started");SendShellStarted(true);
}void SshClient::OnShellDataRecieved()
{QByteArray data = mpShell->readAll();if (data.isEmpty())return;emit SendDataRecv(data);LOG_DEBUG("recv from shell data:%s",data.data());
}void SshClient::OnShellError()
{emit SendRetMsg(QString::fromLocal8Bit("错误:%1").arg(mpShell->errorString()));LOG_ERROR("recv from shell err:%s",mpShell->errorString().toLocal8Bit().data());
}// 发送了命令后，shell会回复两条同样的命令，用于回显
void SshClient::SendCmd(const QByteArray &data)
{if(!mpShell){LOG_ERROR("shell is not start, can't sendmsg:%s",data.data());return;}qint64 n = mpShell->write(data);LOG_DEBUG("write shell data, len:%d, data:%s",n,data.data());static const int timeoutMs = 3000;int index = 0;bool bsucc = mpShell->waitForReadyRead(10);while(!bsucc && index < timeoutMs){	index += 10;QCoreApplication::processEvents();if (!mpShell) break;bsucc = mpShell->waitForReadyRead(10);} /*if (bsucc){QByteArray data = mpShell->readAll();if (data.isEmpty())return;emit SendDataRecv(data);LOG_DEBUG("recv from shell data:%s", data.data());}*/
}