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Qt-interest Archive, September 2007
How should I handle ftp/http errors?

Message 1 in thread

Hi!

I wrote class which should be able to download files using ftp and http 
protocol. And it works almost fine. I can download files correctly, but when 
I try to get not existing files it fails. I supposed to get error set to true 
in commandFinised and requestFinished signals in such cases but I don't. What 
I supposed to do to to handle such cases?

My program:

#ifndef __MAIN_H
#define __MAIN_H

#include <QObject>
#include <QScriptable>
#include <QStringList>
#include <QUrl>
#include <QFile>
#include <QEventLoop>

class WebGet :
        public QObject
{
        Q_OBJECT
private:
        QEventLoop loop;
        QString error;
        QFile file;

        bool downloadFtp(QUrl & url);
        bool downloadHttp(QUrl & url);
public:
        WebGet();
        QString errorString(void);
        bool download(QUrl & url, const QString & fileName);

private slots:
        void httpRequestFinished(int id, bool err);
        void ftpFinished(int id, bool err);
};

#endif /* __MAIN_H */

#include <QApplication>
#include <QStringList>
#include <QFile>
#include <QHttp>
#include <QFtp>
#include <QDir>
#include <QDebug>

#include "main.h"
#include "main.moc"

WebGet::WebGet()
{
}

bool WebGet::downloadFtp(QUrl & url)
{
	QFtp ftp;
	connect(&ftp, SIGNAL(commandFinished(int, bool)), this, SLOT(ftpFinished(int, 
bool)));

	ftp.connectToHost(url.host(), url.port(21));
	if (1 == loop.exec())
		return false;
		
	if (url.userName().isEmpty())
		ftp.login("anonymous", "test@xxxxxxxx");
	else
		ftp.login(url.userName(), url.password());
	if (1 == loop.exec())
		return false;
	
	QString path = url.path();
	QString dir = path.left(path.lastIndexOf("/"));
	QString fileName = path.mid(path.lastIndexOf("/") + 1);
	
	ftp.cd(QString("/%1").arg(dir));
	if (1 == loop.exec())
		return false;
	
	file.open(QIODevice::WriteOnly);
	ftp.get(fileName, &file);
	if (1 == loop.exec()) {
		file.close();
		file.remove();
		return false;
	}

	file.close();
	return true;
}

bool WebGet::downloadHttp(QUrl & url)
{
	QHttp http;
	connect(&http, SIGNAL(requestFinished(int, bool)), this, 
SLOT(httpRequestFinished(int, bool)));

	http.setHost(url.host(), url.port(80));
	if (1 == loop.exec())
		return false;
	
	if (!url.userName().isEmpty()) {
		http.setUser(url.userName(), url.password());
		if (1 == loop.exec())
			return false;
	}
	
	file.open(QIODevice::WriteOnly);
	http.get(url.path(), &file);
	if (1 == loop.exec()) {
		file.close();
		file.remove();
		return false;
	}
	
	file.close();	
	return true;
}	

void WebGet::ftpFinished(int id, bool err)
{
	QFtp *ftp = (QFtp*)sender();
	
	if (err) {
		error = ftp->errorString();
		loop.exit(1);
	}
	
	loop.exit(0);
}

void WebGet::httpRequestFinished(int id, bool err)
{
	QHttp *http = (QHttp*)sender();

	if (err) {
		error = http->errorString();
		loop.exit(1);
	}
	
	loop.exit(0);
}

bool WebGet::download(QUrl & url, const QString & fileName)
{
	file.setFileName(QString("%1/%2").arg(QDir::homePath()).arg(fileName));

	// if no protocol specified we'll try http first than ftp
	if (url.scheme() == "") {
		url.setScheme("http");
		if (downloadHttp(url))
			return true;
		else
			url.setScheme("ftp");
	}

	if (url.scheme() == "ftp")
		return downloadFtp(url);
	
	if (url.scheme() == "http")
		return downloadHttp(url);

	error = QString("No valid protocol specified!");
	return false;
}

QString WebGet::errorString(void)
{
	return error;
}

int main (int argc, char *argv[])
{
	QApplication app(argc, argv);
	WebGet webget;
	
	QUrl u1("http://www.pers.pl/notexists";);
	QUrl u2("ftp://ftp.pers.pl/notexists";);
	QString f1("out.http");
	QString f2("out.ftp");
	
	qDebug() << webget.download(u1, f1);
	qDebug() << webget.download(u2, f2);
	
	return 0;
}

Regards,
-- 
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Message 2 in thread

Hi Everyone, 

Qt 4.3.1 compiled using MSVC Standard. 

I am porting an existing Windows application to Qt. The application uses a symbol font to draw musical notation. The windows version used a transformation matrix to apply zooming, and it worked well from 1% to 1000%. 

The Qt version applies the zooming to a painter in a QFrame paint event. It only seems to work up to 210%. Over 210% the symbol font characters are drawn at a much smaller size. 

For example:

painter.setFont( QFont( "Times New Roman", 30, -1, false );
painter.scale( iZoom / 100.0, iZoom / 100.0 );
painter.drawText( 300, 300, "&" );

The above works well. I can change the iZoom up to 500% and the character draws correctly. 

If I change it to use "Opus" font, which is a symbol font, then it doesn't. It works OK up to 210%, then jumps to a smaller size at 220%. 

Windows can transform the font correctly, but Qt painter doesn't. 

Eventually, I hope to convert to use GraphicsView. But I do not want to spend all that time rewriting, if the font is not going to work anyway. 

Thanks in advance for any assisstance!  

--
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Message 3 in thread

Dnia niedziela, 23 września 2007, Rafał Cygnarowski napisał:
> Hi!
>
> I wrote class which should be able to download files using ftp and http
> protocol. And it works almost fine. I can download files correctly, but
> when I try to get not existing files it fails. I supposed to get error set
> to true in commandFinised and requestFinished signals in such cases but I
> don't. What I supposed to do to to handle such cases?

Noone knows what's wrong with this? Is it my code problem or it's Qt 
feature/bug?

Regards,
-- 
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