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|
#!/usr/bin/perl
package DownloadManager;
use strict;
use warnings;
use QtCore4;
use QtNetwork4;
use QtCore4::isa qw( Qt::Object );
use QtCore4::slots
execute => [],
downloadFinished => ['QNetworkReply *'];
use List::MoreUtils qw( first_index );
sub manager {
return this->{manager};
}
sub currentDownloads {
return this->{currentDownloads};
}
sub NEW
{
my ($class) = @_;
$class->SUPER::NEW();
this->{manager} = Qt::NetworkAccessManager();
this->{currentDownloads} = [];
this->connect(manager(), SIGNAL 'finished(QNetworkReply*)',
SLOT 'downloadFinished(QNetworkReply*)');
}
sub doDownload
{
my ($url) = @_;
my $request = Qt::NetworkRequest($url);
my $reply = manager()->get($request);
push @{currentDownloads()}, $reply;
}
sub saveFileName
{
my ($url) = @_;
my $path = $url->path();
my $basename = Qt::FileInfo($path)->fileName();
if (!defined $basename) {
$basename = 'download';
}
if (Qt::File::exists($basename)) {
# already exists, don't overwrite
my $i = 0;
$basename .= '.';
while (Qt::File::exists($basename . $i)) {
++$i;
}
$basename .= $i;
}
return $basename;
}
sub saveToDisk
{
my ($filename, $data) = @_;
my $file = Qt::File($filename);
if (!$file->open(Qt::IODevice::WriteOnly())) {
printf STDERR "Could not open %s for writing: %s\n",
$filename,
$file->errorString();
return 0;
}
$file->write($data->readAll());
$file->close();
return 1;
}
sub execute
{
my $args = Qt::CoreApplication::instance()->arguments();
shift @{$args};
if (scalar @{$args} == 0) {
printf "Qt Download example - downloads all URLs in parallel\n" .
"Usage: download url1 [url2... urlN]\n" .
"\n" .
"Downloads the URLs passed in the command-line to the local directory\n" .
"If the target file already exists, a .0, .1, .2, etc. is appended to\n" .
"differentiate.\n";
Qt::CoreApplication::instance()->quit();
return;
}
foreach my $arg ( @{$args} ) {
my $url = Qt::Url::fromEncoded(Qt::ByteArray($arg));
doDownload($url);
}
}
sub downloadFinished
{
my ($reply) = @_;
my $url = $reply->url();
if ($reply->error() != Qt::NetworkReply::NoError()) {
printf STDERR "Download of %s failed: %s\n",
$url->toEncoded()->constData(),
$reply->errorString();
} else {
my $filename = saveFileName($url);
if (saveToDisk($filename, $reply)) {
printf "Download of %s succeded (saved to %s)\n",
$url->toEncoded()->constData(), $filename;
}
}
my $index = first_index{ $_->Qt::base::getPointer == $reply->Qt::base::getPointer } @{currentDownloads()};
splice @{currentDownloads()}, $index, 1;
$reply->deleteLater();
if (scalar @{currentDownloads()} == 0) {
# all downloads finished
Qt::CoreApplication::instance()->quit();
}
}
package main;
use strict;
use warnings;
use QtCore4;
use DownloadManager;
sub main
{
my $app = Qt::CoreApplication(\@ARGV);
my $manager = DownloadManager();
Qt::Timer::singleShot(0, $manager, SLOT 'execute()');
return $app->exec();
}
exit main();
|
