Fix torrent loading problem from Web UI on Windows.

src/downloadthread.cpp

@@ -86,9 +86,8 @@ void DownloadThread::processDlFinished(QNetworkReply* reply) {
       // TODO: Support GZIP compression
       tmpfile->write(reply->readAll());
       tmpfile->close();
-      // XXX: For some reason, tmpfile has to be destroyed before
-      // the signal is sent or the file stays locked on Windows
-      // for some reason.
+      // XXX: tmpfile needs to be deleted on Windows before using the file
+      // or it will complain that the file is used by another process.
       delete tmpfile;
       // Send finished signal
       emit downloadFinished(url, filePath);

src/qtlibtorrent/qbtsession.cpp

@@ -989,9 +989,10 @@ QTorrentHandle QBtSession::addTorrent(QString path, bool fromScanDir, QString fr
     t = new torrent_info(path.toUtf8().constData());
     if(!t->is_valid())
       throw std::exception();
-  } catch(std::exception&) {
+  } catch(std::exception& e) {
     if(!from_url.isNull()) {
       addConsoleMessage(tr("Unable to decode torrent file: '%1'", "e.g: Unable to decode torrent file: '/home/y/xxx.torrent'").arg(from_url), QString::fromUtf8("red"));
+      addConsoleMessage(QString::fromLocal8Bit(e.what()), "red");
       //emit invalidTorrent(from_url);
       misc::safeRemove(path);
     }else{

src/webui/httpconnection.cpp

@@ -430,16 +430,18 @@ void HttpConnection::respondCommand(const QString& command) {
   if(command == "upload") {
     qDebug() << Q_FUNC_INFO << "upload";
     // Get a unique filename
-    // XXX: We need to use a QTemporaryFile pointer here
-    // and it fails on Windows.
-    // The file also needs to end with .torrent otherwise
-    // it fails to load on Windows.
     QTemporaryFile *tmpfile = new QTemporaryFile (QDir::temp().absoluteFilePath("qBT-XXXXXX.torrent"));
+    tmpfile->setAutoRemove(false);
     if (tmpfile->open()) {
+      QString filePath = tmpfile->fileName();
       tmpfile->write(m_parser.torrent());
       tmpfile->close();
-      emit torrentReadyToBeDownloaded(tmpfile->fileName(), false, QString(), false);
-      tmpfile->deleteLater();
+      // XXX: tmpfile needs to be deleted on Windows before using the file
+      // or it will complain that the file is used by another process.
+      delete tmpfile;
+      emit torrentReadyToBeDownloaded(filePath, false, QString(), false);
+      // Clean up
+      QFile::remove(filePath);
     } else {
       std::cerr << "I/O Error: Could not create temporary file" << std::endl;
       delete tmpfile;