基于QT的FTP实现方案(Android_And_Windows)

前言

基于QT来实现FTP并不是什么难事，有以下三种解决方案：
Android/PC代码一致

1.使用网络管理模块（实现上传下载）；

    mMgr =new QNetworkAccessManager();
    mUrl = new QUrl();
    mUrl->setScheme("ftp");
    mUrl->setHost(ip);
    mUrl->setPort(port);
    
void JHFtp::get(QString src, QString des){
    QFileInfo info;
    info.setFile(des);
    mFile = new QFile(info.filePath());
    if(mFile->open(QIODevice::WriteOnly)){
        qDebug()<<"file opened";
        mUrl->setPath(src);
    }
    mReply = mMgr->get(QNetworkRequest(*mUrl));
    connect(mReply,SIGNAL(readyRead()),this,SLOT(readData()));
    connect(mReply,SIGNAL(finished()),this,SLOT(finishGet()));
    connect(mReply,SIGNAL(finished()),mReply,SLOT(deleteLater()));
    connect(mReply,static_cast<void(QNetworkReply::*)(QNetworkReply::NetworkError)>(&QNetworkReply::error),this,[&](QNetworkReply::NetworkError){
        if(mReply)
        qDebug()<<mReply->errorString();
    });
    connect(mReply, SIGNAL(error(QNetworkReply::NetworkError)),this,SLOT(error(QNetworkReply::NetworkError)));
    connect(mReply,SIGNAL(downloadProgress(qint64,qint64)),this,SLOT(progressUpdated(qint64,qint64)));
}

 QFile file(src);
    QByteArray data;
    if(file.open(QIODevice::ReadOnly)){
        data = file.readAll();


    }
    file.close();
    mUrl->setPath(des);


    mReply=mMgr->put(QNetworkRequest(*mUrl), data);


    connect(mReply,SIGNAL(finished()),this,SLOT(finishPut()));
    connect(mReply, SIGNAL(error(QNetworkReply::NetworkError)),this,SLOT(error(QNetworkReply::NetworkError)));
    connect(mReply,SIGNAL(finished()),mReply,SLOT(deleteLater()));
    connect(mReply,SIGNAL(uploadProgress(qint64,qint64)),this,SLOT(progressUpdated(qint64,qint64)));

2.使用curl 网络类库；

get/put实现比较简单就不写了主要写一下实现列表获取以及中文处理：

    CURL *curl=curl_easy_init();
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);

    curl_easy_setopt(curl, CURLOPT_URL, "ftp://188.***.***.***/");

   curl_easy_setopt(curl, CURLOPT_USERPWD, "user***:pass****");
   curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, ftpwrite);
   curl_easy_setopt(curl,CURLOPT_DNS_CACHE_TIMEOUT,50);
   res = curl_easy_perform(curl);

   if(res != CURLE_OK){
      return -1;
   }
   qDebug()<<"OK";
   curl_easy_cleanup(curl);
   return 1;

很多人采用这种方式:得到中文乱码:

static size_t callback(void *ptr, size_t size, size_t nmemb, void *stream) {
        QString msg;
         msg =QString((char *) ptr);
        rec_data += msg;
  rn size * nmemb;
}

由于编码不一致导致,建议采用：

static size_t ftpwrite(void *ptr, size_t size, size_t nmemb, void *data)
{
    QString msg;
    
     msg =QString::fromLocal8Bit((char *)ptr);

     qDebug()<<"MSG:"<<msg;

     ftp += msg;

     return size * nmemb;
}

基于QT的FTP实现方案(Android_And_Windows)

3.使用QFtp

    ftp2 = new QFtp(o);
    ftp2->connectToHost("218.***.***.***", ***);
    
    ftp2->login("user*****","pass****");

 
    connect(ftp2,SIGNAL(listInfo(QUrlInfo)),this,SLOT(listInfo(QUrlInfo)));

    connect(ftp2,SIGNAL(dataTransferProgress(qint64,qint64)),this,SLOT(progressSlot(qint64,qint64)));


////获取列表
 ftp2->list();

////创建yjhlog
 ftp2->mkdir("yjhlog");

///重命名
 ftp2->rename(z,b);
 
/// 删除
 ftp2->remove(fname);
 
///下载 
 ftp2->get(path+"/"+name,pFile);
 
////上传
ftp2->put(arry,spath);

在QFtp 基础上进行了封装：附带model 以及状态：

    ftp2 = new QtFtp(o);
    ftp2->setFtp("***.***.***.***", port,"user","pass");

    connect(ftp2,&QtFtp::updateModel,this,[=](bool clear){
        qDebug()<<clear;
        pEngine->rootContext()->setContextProperty("fmodel",QVariant::fromValue(ftp2->filesModel));
        if(clear){
            ftp2->clearModel();
        }


    });
    pEngine->rootContext()->setContextProperty("fmodel",QVariant::fromValue(ftp2->filesModel));
  
    ftp2->connectFtp();
    
    ftp2->load();




void MainApp::backDir(){
    ftp2->back();
}


void MainApp::downloadF(QString name){


   ftp2->downFile(name,QDir::currentPath());


}


void MainApp::upFile(QString name){
    name="D:/WinStartLog.log";
    ftp2->upFile(name);


}


void MainApp::rename(QString olds,QString news){


   ftp2->reName(olds,news);


}


void MainApp::deleteFile(QString fname){
   ftp2->deleteFile(fname);


}


void MainApp::updateModel(QString s){
    ftp2->load(s);