為了方便網(wǎng)絡(luò)編程，Qt 提供了 Network 模塊。該模塊包含了許多類，本文介紹了Qt實(shí)現(xiàn)FTP的上傳和下載，分享給大家
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本來想簡單抄抄書，隨便手寫個(gè)Ftp客戶端的，結(jié)果發(fā)現(xiàn)教材上的是基于Qt4的QFtp類庫，而在Qt5中取消了這一個(gè)類庫（同時(shí)也取消了QHttp等的類），取而代之的是QNetworkAccessManager 這個(gè)類，把這些雜貨全都攬下來了，據(jù)說是因?yàn)橹暗膬蓚€(gè)類有重復(fù)而且效率有問題balabala。于是就百度了一下，發(fā)現(xiàn)百度上要么講的不全，要么就是要去下一個(gè)由熱心網(wǎng)民重新封裝的QFtp類。顯然我并不喜歡無腦復(fù)制粘貼，想好好看下Qt官方提供的東西的用法，深入的理解下Qt網(wǎng)絡(luò)編程，于是就果斷自行g(shù)oogle（話說google真好用），加上查看幫助文檔，終于把一個(gè)簡版的Ftp客戶端大概框架弄清楚了。
不多說，上源碼：
Dialog.pro
#------------------------------------------------- # # Project created by QtCreator 2015-10-29T23:52:56 # #------------------------------------------------- QT += core gui QT += network #這里要添加這個(gè)庫 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 //注意需要添加的頭文件 #include#include #include #include #include #include #include #include #include #include #include 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;//這個(gè)是重點(diǎn) protected slots: //處理按鈕的點(diǎn)擊信號 void slotPut(); void slotGet(); //處理網(wǎng)絡(luò)連接的信號 void managePut(QNetworkReply*); void manageGet(QNetworkReply*); }; #endif // DIALOG_H
dialog.cpp
重慶分公司
重慶分公司
#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);//設(shè)置加密顯示
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
//按鈕點(diǎn)擊事件信號槽的連接
connect(PbPut,SIGNAL(clicked()),this,SLOT(slotPut()));
connect(PbGet,SIGNAL(clicked()),this,SLOT(slotGet()));
}
void Dialog::managePut(QNetworkReply * reply){
qDebug()<error();//輸出調(diào)試信息
switch(reply->error()){//判斷連接后的狀態(tài)
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類似
qDebug()<error();
QByteArray data;
switch(reply->error()){
case QNetworkReply::NoError:
data=reply->readAll();//從url中讀取文件內(nèi)容，輸出到data中（也可以再將數(shù)據(jù)寫入到文件中，為了方便，這里就權(quán)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(){
//判斷信息輸入完整
if(LeUser->text().isEmpty()||LePasswd->text().isEmpty()||LeServer->text().isEmpty()){
QMessageBox::warning(this,"Error","Please fill in the information");
return ;
}
//重點(diǎn)！將之前的槽清空并重新連接至需要的
manager.disconnect(SIGNAL(finished(QNetworkReply*)));
//完全清空某對象連接的槽可以用manager.disconnect();
connect(&manager,SIGNAL(finished(QNetworkReply*)),SLOT(managePut(QNetworkReply*)));
//設(shè)置登錄信息
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);//將data上傳到url中，返回的reply將觸發(fā)網(wǎng)絡(luò)的連接信號
}
void Dialog::slotGet(){
//基本意義與slotPut類似
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" #includeint main(int argc, char *argv[]) { QApplication a(argc, argv); Dialog w; w.show(); return a.exec(); }
5、運(yùn)行截圖
權(quán)且只顯示主界面：
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持創(chuàng)新互聯(lián)。
