How can i get ftp files show on my list widget using QNetworkAccessManager Qt 5.8?

SGaist

This has nothing to do with Qt.

Didn't you get a new folder named qtftp ?

walter-j

yes . will i build it in Qt?

SGaist

Open the project .pro file with Qt Creator and build it.

By the way, what OS are you on ?

walter-j

linux mint 18 sarah

walter-j

i got this message : cannot create a directory / mkspecs/modules-inst when im building it

SGaist

Which version of Qt are you using to build that module ?

walter-j

Qt 5.7.1 . now i can build . what can i do else?

walter-j

my programm does not recognize QFtp but i have already built it

SGaist

Did you install the module ?

walter-j

yes i have installed the module

SGaist

Did you add QT += ftp to your .pro file and re-run qmake after that ?

walter-j

yes.

But commandFinshed signal does not work. here is my code:

FtpDialog.h

#ifndef FTPDIALOG_H
#define FTPDIALOG_H

#include <QDialog>
#include <QFtp>
#include <QMessageBox>
#include <QDebug>

namespace Ui {
class FtpDialog;
}

class FtpDialog : public QDialog
{
Q_OBJECT

public:
explicit FtpDialog(QWidget *parent = 0);
~FtpDialog();

public slots:
void connectClicked();
void ftpFinished(int, bool);
void getFileList();
signals:

private:
Ui::FtpDialog *ui;
QFtp ftp;
};

#endif // FTPDIALOG_H

walter-j

FtpDialog.cpp

#include "ftpdialog.h"
#include "ui_ftpdialog.h"

FtpDialog::FtpDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::FtpDialog)
{
ui->setupUi(this);
connect(ui->connectButton, SIGNAL(clicked()), this, SLOT(connectClicked()));
connect(&ftp,SIGNAL(commandFinished(int,bool)), this, SLOT(ftpFinished(int,bool)));

ui->disconnectButton->setEnabled(false);
ui->cdButton->setEnabled(false);
ui->upButton->setEnabled(false);
ui->getButton->setEnabled(false);

}

FtpDialog::~FtpDialog()
{
delete ui;
}

void FtpDialog::connectClicked()
{
ui->connectButton->setEnabled(false);

 ftp.connectToHost("ftp.trolltech.com");
 ui->statusLabel->setText(tr("Connecting to host..."));

}

void FtpDialog::ftpFinished(int request, bool error)
{
// Handle errors depending on the command caussing it
qDebug()<<ftp.currentCommand();
if(error)
{
switch(ftp.currentCommand())
{
case QFtp::ConnectToHost:
QMessageBox::warning(this, tr("Error"), tr("Failed to connect to host."));
ui->connectButton->setEnabled(true);

        break;
    case QFtp::Login:
        QMessageBox::warning(this, tr("Error"), tr("Failed to login."));
        ui->connectButton->setEnabled(true);

        break;

    case QFtp::List:
        QMessageBox::warning(this, tr("Error"),
                             tr("Failed to get file list.\nClosing connection"));
        ftp.close();

        break;

    }

    ui->statusLabel->setText(tr("Ready."));

}
// React to the current command and issue
// more commands or update the user interface
else
{
switch(ftp.currentCommand())
{
case QFtp::ConnectToHost:
ftp.login();

        break;
    case QFtp::Login:
        getFileList();

        break;

    case QFtp::Close:
        ui->connectButton->setEnabled(true);
       // getFileList();

        break;
    case QFtp::List:
        ui->disconnectButton->setEnabled(true);
        ui->upButton->setEnabled(true);
        ui->statusLabel->setText(tr("Ready."));

        break;

    }
}

}

void FtpDialog::getFileList()
{

}

jsulm

@walter-j You should connect a slot to http://doc.qt.io/qt-4.8/qftp.html#stateChanged and see what happens

walter-j

But in the book they used commandFinished(int, bool) signal.

J.Hilk

@walter-j

keep in mind that QFftp has not been updated for a very long time and therefore may not automatically support your target FTp-Servers protocolls.

I run into this, when one of my old projects worked fine with the old FTP-Server but failed completely with the new one.

jsulm

@walter-j I did not say you should not use commandFinished, just add another slot to see whether you get any state changes.

VRonin

You need an external library and I don't feel to recommend QFtp as it's not maintained anymore. libCURL is probably the standard library in the C/C++ world (and probably beyond). You can use a cpp wrapper like curlpp if you don't like the aftertaste C leaves in your mouth.

This example (source) will download the list of files from ftp://ftp.funet.fi/ and save it in a file called ftp-list

#include <stdio.h>
 
#include <curl/curl.h>
 
static size_t
write_response(void *ptr, size_t size, size_t nmemb, void *data)
{
  FILE *writehere = (FILE *)data;
  return fwrite(ptr, size, nmemb, writehere);
}
 
#define FTPBODY "ftp-list"
#define FTPHEADERS "ftp-responses"
 
int main(void)
{
  CURL *curl;
  CURLcode res;
  FILE *ftpfile;
  FILE *respfile;
 
  /* local file name to store the file as */ 
  ftpfile = fopen(FTPBODY, "wb"); /* b is binary, needed on win32 */ 
 
  /* local file name to store the FTP server's response lines in */ 
  respfile = fopen(FTPHEADERS, "wb"); /* b is binary, needed on win32 */ 
 
  curl = curl_easy_init();
  if(curl) {
    /* Get a file listing from sunet */ 
    curl_easy_setopt(curl, CURLOPT_URL, "ftp://ftp.funet.fi/");
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, ftpfile);
    /* If you intend to use this on windows with a libcurl DLL, you must use
       CURLOPT_WRITEFUNCTION as well */ 
    curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, write_response);
    curl_easy_setopt(curl, CURLOPT_HEADERDATA, respfile);
    res = curl_easy_perform(curl);
    /* Check for errors */ 
    if(res != CURLE_OK)
      fprintf(stderr, "curl_easy_perform() failed: %s\n",
              curl_easy_strerror(res));
 
    /* always cleanup */ 
    curl_easy_cleanup(curl);
  }
 
  fclose(ftpfile); /* close the local file */ 
  fclose(respfile); /* close the response file */ 
 
  return 0;
}

walter-j

stateChanged solved the problem.

Thank you guys

JK

SGaist

You're welcome !

Since you have it working now, please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)