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

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 :)

walter-j

i have searched for it . i didn't find

SGaist

Do you mean the "Topic Tools" button ?

There's one just under your original post or at the bottom of the page under the last post.