为了方便网络编程,Qt 提供了 Network 模块。该模块包含了许多类,本文介绍了Qt实现FTP的上传和下载,分享给大家
在网站设计、做网站中从网站色彩、结构布局、栏目设置、关键词群组等细微处着手,突出企业的产品/服务/品牌,帮助企业锁定精准用户,提高在线咨询和转化,使成都网站营销成为有效果、有回报的无锡营销推广。创新互联专业成都网站建设十载了,客户满意度97.8%,欢迎成都创新互联客户联系。
本来想简单抄抄书,随便手写个Ftp客户端的,结果发现教材上的是基于Qt4的QFtp类库,而在Qt5中取消了这一个类库(同时也取消了QHttp等的类),取而代之的是QNetworkAccessManager 这个类,把这些杂货全都揽下来了,据说是因为之前的两个类有重复而且效率有问题balabala。于是就百度了一下,发现百度上要么讲的不全,要么就是要去下一个由热心网民重新封装的QFtp类。显然我并不喜欢无脑复制粘贴,想好好看下Qt官方提供的东西的用法,深入的理解下Qt网络编程,于是就果断自行google(话说google真好用),加上查看帮助文档,终于把一个简版的Ftp客户端大概框架弄清楚了。
不多说,上源码:
Dialog.pro
#------------------------------------------------- # # Project created by QtCreator 2015-10-29T23:52:56 # #------------------------------------------------- QT += core gui QT += network #这里要添加这个库 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets TARGET = QFtp TEMPLATE = app SOURCES += main.cpp dialog.cpp HEADERS += dialog.h
dialog.h
#ifndef DIALOG_H #define DIALOG_H //注意需要添加的头文件 #include<QDialog> #include<QPushButton> #include<QFile> #include<QNetworkReply> #include<QLineEdit> #include<QtNetwork/QNetworkAccessManager> #include<QtNetwork/QNetworkRequest> #include<QLabel> #include<QString> #include<QGridLayout> #include<QMessageBox> class Dialog : public QDialog { Q_OBJECT public: Dialog(QWidget *parent = 0); ~Dialog(); public: QGridLayout *layout; QLabel *LbServer,*LbUser,*LbPasswd; QLineEdit *LeServer,*LeUser,*LePasswd; QPushButton *PbPut,*PbGet; QNetworkAccessManager manager;//这个是重点 protected slots: //处理按钮的点击信号 void slotPut(); void slotGet(); //处理网络连接的信号 void managePut(QNetworkReply*); void manageGet(QNetworkReply*); }; #endif // DIALOG_H
dialog.cpp
#include "dialog.h" Dialog::Dialog(QWidget *parent) : QDialog(parent) { setWindowTitle("My Ftp"); layout=new QGridLayout(this); LbServer=new QLabel("Server:"); LbUser=new QLabel("User:"); LbPasswd=new QLabel("Passwd:"); LeServer=new QLineEdit("ftp://120.27.41.126/home/myths/1.txt"); LeUser=new QLineEdit("myths"); LePasswd=new QLineEdit("123456"); LePasswd->setEchoMode(QLineEdit::Password);//设置加密显示 PbPut=new QPushButton("Put"); PbGet=new QPushButton("Get"); layout->addWidget(LbServer,0,0); layout->addWidget(LeServer,0,1); layout->addWidget(LbUser,1,0); layout->addWidget(LeUser,1,1); layout->addWidget(LbPasswd,2,0); layout->addWidget(LePasswd,2,1); layout->addWidget(PbPut,3,0); layout->addWidget(PbGet,3,1); setFixedSize(300,200);//固定大小 //按钮点击事件信号槽的连接 connect(PbPut,SIGNAL(clicked()),this,SLOT(slotPut())); connect(PbGet,SIGNAL(clicked()),this,SLOT(slotGet())); } void Dialog::managePut(QNetworkReply * reply){ qDebug()<<reply->error();//输出调试信息 switch(reply->error()){//判断连接后的状态 case QNetworkReply::NoError: QMessageBox::information(this,"Put information","Upload Success!"); break; case QNetworkReply::HostNotFoundError: QMessageBox::information(this,"Put information","Host Not Found!"); break; case QNetworkReply::AuthenticationRequiredError: QMessageBox::information(this,"Put information","Login Failure!"); break; default: QMessageBox::information(this,"Put information","Unknown Failure"); break; } } void Dialog::manageGet(QNetworkReply *reply){ //基本和managerPut类似 qDebug()<<reply->error(); QByteArray data; switch(reply->error()){ case QNetworkReply::NoError: data=reply->readAll();//从url中读取文件内容,输出到data中(也可以再将数据写入到文件中,为了方便,这里就权且打印一下吧) QMessageBox::information(this,"Put information","Upload Success!nThe file you've got is :n"+data); break; case QNetworkReply::HostNotFoundError: QMessageBox::information(this,"Put information","Host Not Found!"); break; case QNetworkReply::AuthenticationRequiredError: QMessageBox::information(this,"Put information","Login Failure!"); break; default: QMessageBox::information(this,"Put information","Unknown Failure"); break; } } Dialog::~Dialog() { } void Dialog::slotPut(){ //判断信息输入完整 if(LeUser->text().isEmpty()||LePasswd->text().isEmpty()||LeServer->text().isEmpty()){ QMessageBox::warning(this,"Error","Please fill in the information"); return ; } //重点!将之前的槽清空并重新连接至需要的 manager.disconnect(SIGNAL(finished(QNetworkReply*))); //完全清空某对象连接的槽可以用manager.disconnect(); connect(&manager,SIGNAL(finished(QNetworkReply*)),SLOT(managePut(QNetworkReply*))); //设置登录信息 QUrl url(LeServer->text()); url.setPort(21); url.setUserName(LeUser->text()); url.setPassword(LePasswd->text()); QByteArray data="This is the test data.n"; /*QNetworkReply *reply=*/ manager.put(QNetworkRequest(url),data);//将data上传到url中,返回的reply将触发网络的连接信号 } void Dialog::slotGet(){ //基本意义与slotPut类似 if(LeUser->text().isEmpty()||LePasswd->text().isEmpty()||LeServer->text().isEmpty()){ QMessageBox::warning(this,"Error","Please fill in the information"); return ; } manager.disconnect(SIGNAL(finished(QNetworkReply*))); connect(&manager,SIGNAL(finished(QNetworkReply*)),SLOT(manageGet(QNetworkReply*))); QUrl url(LeServer->text()); url.setPort(21); url.setUserName(LeUser->text()); url.setPassword(LePasswd->text()); /*QNetworkReply *reply=*/ manager.get((QNetworkRequest(url))); }
main.cpp
#include "dialog.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); Dialog w; w.show(); return a.exec(); }
5、运行截图
权且只显示主界面:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。
本文标题:Qt实现FTP的上传和下载的实例代码
URL标题:https://www.cdcxhl.com/article28/ieedcp.html
成都网站建设公司_创新互联,为您提供网站导航、响应式网站、网站设计公司、标签优化、关键词优化、App设计
声明:本网站发布的内容(图片、视频和文字)以用户投稿、用户转载内容为主,如果涉及侵权请尽快告知,我们将会在第一时间删除。文章观点不代表本网站立场,如需处理请联系客服。电话:028-86922220;邮箱:631063699@qq.com。内容未经允许不得转载,或转载时需注明来源: 创新互联