qftp的源码，看我上一篇文章，或者自行搜索

头文件

#include "qftp.h"//这个头文件描述文件信息，暂时没用上
#include <QFileInfo>class A
{private slots://这两个必须实现void ftpStateChanged(int state);void ftpCommandFinish(int id, bool en);//上传文件到客户端QString ftp_put_file(QString filename);
private:QFtp* ftp = nullptr;};

实现这两个信号槽

void A::ftpStateChanged(int state)
{if (state == QFtp::Unconnected){// IsLogin = false;qDebug() << "state change to QFtp::Unconnected" << endl;}if (state == QFtp::Connected){qDebug() << "state change to QFtp::Connected" << endl;}if (state == QFtp::HostLookup){qDebug() << "state change to QFtp::HostLookup" << endl;}if (state == QFtp::LoggedIn){qDebug() << "state change to QFtp::LoggedIn" << endl;// IsLogin = true;}if (state == QFtp::Closing){qDebug() << "state change to QFtp::Closing" << endl;}
}void A::ftpCommandFinish(int id, bool en)
{Q_UNUSED(id)if (ftp->currentCommand() == QFtp::ConnectToHost){if (en){qDebug() << "QFtp::ConnectToHost ftp->errorString: " << ftp->errorString() << endl;}else{}}if (ftp->currentCommand() == QFtp::Login){if (en){qDebug() << "QFtp::Login ftp->errorString: " << ftp->errorString() << endl;}else{//            ftp->cd(toSpecialEncoding("/"));//            ftp->list();}}if (ftp->currentCommand() == QFtp::Cd ||ftp->currentCommand() == QFtp::List){}if (ftp->currentCommand() == QFtp::Get){if (en){qDebug() << "ftp->errorString: " << ftp->errorString() << endl;}else{}}else if (ftp->currentCommand() == QFtp::Put){if (en){qDebug() << "QFtp::Put ftp->errorString: " << ftp->errorString() << endl;QMessageBox::information(nullptr, JString("上传失败"), ftp->errorString());ftp->abort();}else{qDebug() << "QFtp::Put successed" << endl;}}else if (ftp->currentCommand() == QFtp::Close){}else if (ftp->currentCommand() == QFtp::Unconnected){}else if (ftp->currentCommand() == QFtp::Rename){}else if (ftp->currentCommand() == QFtp::Mkdir){if(en){qDebug()<<"QFtp::Mkdir failed: "<< ftp->errorString() <<endl;}else{qDebug()<<"QFtp::Mkdir successed"<<endl;}}else if (ftp->currentCommand() == QFtp::Remove){}else if (ftp->currentCommand() == QFtp::Rmdir){}
}	

main函数,初始化

  void main(){ftp = new QFtp(this);connect(ftp, SIGNAL(stateChanged(int)), this, SLOT(ftpStateChanged(int)));connect(ftp, SIGNAL(commandFinished(int, bool)), SLOT(ftpCommandFinish(int, bool)));ftp->connectToHost( "127.0.0.1", 21);ftp->login("Software Department", "zhizhou666");}

上传file到客户端

//上传file
QString ftp_put_file(QString filename);QString Home::ftp_put_file(QString filename)
{if (ftp->state() != QFtp::LoggedIn){QMessageBox::information(nullptr, JString("无法上传"), JString("FTP 登录失败，无法上传文件"));return QString();}QFileInfo info(filename);QString new_dir = "save file"ftp->mkdir(new_dir);QString ftp_path =  "E:/123.xml";QFile *m_File = new QFile(filename);//m_File = new QFile("E:/cache/ETLinkInitPlan-data-base.xml");//m_File = new QFile("E:/cache/240116T143345.xml");if (!m_File->isOpen()){ftp->put(m_File, ftp_path);}else{qDebug()<<"ftp file opened, upload failed!"<<endl;}m_File->close();return ftp_path;
}