qt4使用QFtp实现ftp文件同步下载实例

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本文提供了一个qt4.8下利用QFtp封装的一个文件同步下载的例子。

ftpclient.h

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#ifndef FTPCLIENT_H
#define FTPCLIENT_H

#include <QObject>
#include <QFtp>
#include <QFile>

class FtpClient : public QObject
{
    Q_OBJECT
public:
    explicit FtpClient(QObject *parent = 0);
    bool getFile(QString path, QString name, QString localPath);
    void setHost(QString ip, int port=21);
    void setLogin(QString username, QString password);

signals:
    void getFileDoneSignal();

public slots:
    void getFileDoneSlot(bool err);
private:
    QFile file;
    QFtp ftp;
    bool ftpFlag;
private:
    QString ip;
    int port;
    QString username;
    QString password;
};

#endif // FTPCLIENT_H

ftpclient.cpp

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#include "ftpclient.h"
#include <QDir>
#include <QEventLoop>

FtpClient::FtpClient(QObject *parent) : QObject(parent)
{
    connect(&ftp, SIGNAL(done(bool)), this, SLOT(getFileDoneSlot(bool)));
}

bool FtpClient::getFile(QString path, QString name, QString localPath)
{
    QDir dir;
    if (!dir.exists(localPath)) {
        dir.mkpath(localPath);
    }
    file.setFileName(localPath+"/"+name);
    if (!file.open(QIODevice::WriteOnly)) {
        return false;
    }
    ftp.connectToHost(ip, port);
    ftp.login(username, password);
    ftp.cd(path);
    ftp.get(name, &file);
    ftp.close();
    QEventLoop loop;
    connect(this, SIGNAL(getFileDoneSignal()), &loop, SLOT(quit()));
    loop.exec();
    return ftpFlag;
}

void FtpClient::setHost(QString ip, int port)
{
    this->ip = ip;
    this->port = port;
}

void FtpClient::setLogin(QString username, QString password)
{
    this->username = username;
    this->password = password;
}

void FtpClient::getFileDoneSlot(bool err)
{
    file.close();
    if (err) {
        ftpFlag = false;
    }
    else {
        ftpFlag = true;
    }
    emit getFileDoneSignal();
}