Я использую QtNetwork, QNetworkAccessManager, QNetworkRequest, QNetworkReply, чтобы настроить модальное диалоговое окно для загрузки любого файла, указанного в пути URL.
Когда я начинаю загрузку, я получаю сообщение об ошибке: Download failed: TLS initialization или «Загрузка не удалась: подтверждение SSL не удалось», в зависимости от разных машин, на которых я это тестирую.
Кажется, быть проблемой OpenSSL. Есть ли способ исправить ошибку, не требуя, чтобы на пользовательском компьютере был установлен OpenSSL?
Это мой класс загрузки
fAppDownloadDialog::fAppDownloadDialog()
{
// set up UI modal dialog
// ...
// ...
connect(cancelButton, SIGNAL(clicked()), this, SLOT(CancelButtonPressed()));
connect(confirmButton, SIGNAL(clicked()), this, SLOT(ConfirmButtonPressed()));
}
void fAppDownloadDialog::CancelButtonPressed()
{
this->close();
}
void fAppDownloadDialog::ConfirmButtonPressed()
{
manager = new QNetworkAccessManager(this);
QFileInfo fileInfo(url.path()); // QUrl url defined in .h
QString fileName = fileInfo.fileName();
fullPath = downloadPath + fileName; // QString fullPath, downloadPath in .h
if (QFile::exists(fullPath)) {
if (QMessageBox::question(this, tr("HTTP"),
tr("There already exists a file %1. Overwrite?").arg(fileName),
QMessageBox::Yes|QMessageBox::No, QMessageBox::No)
== QMessageBox::No)
return;
QFile::remove(fullPath);
}
file = new QFile(fullPath); // QFile file in .h
if (!file->open(QIODevice::WriteOnly)) {
QMessageBox::information(this, tr("HTTP"),
tr("Unable to save the file %1: %2")
.arg(fileName).arg(file->errorString()));
delete file;
file = 0;
return;
}
// used for progressDialog
// This will be set true when canceled from progress dialog
httpRequestAborted = false;
startRequest(url);
this->close();
}
// This will be called when download button is clicked
void fAppDownloadDialog::startRequest(QUrl url)
{
// get() method posts a request
// to obtain the contents of the target request
// and returns a new QNetworkReply object
// opened for reading which emits
// the readyRead() signal whenever new data arrives.
reply = manager->get(QNetworkRequest(url));
// Whenever more data is received from the network,
// this readyRead() signal is emitted
connect(reply, SIGNAL(readyRead()),
this, SLOT(httpReadyRead()));
// This signal is emitted when the reply has finished processing.
// After this signal is emitted,
// there will be no more updates to the reply's data or metadata.
connect(reply, SIGNAL(finished()),
this, SLOT(httpDownloadFinished()));
}
void fAppDownloadDialog::httpReadyRead()
{
// this slot gets called every time the QNetworkReply has new data.
// We read all of its new data and write it into the file.
// That way we use less RAM than when reading it at the finished()
// signal of the QNetworkReply
if (file)
file->write(reply->readAll());
}
// When download finished or canceled, this will be called
void fAppDownloadDialog::httpDownloadFinished()
{
// when canceled
if (httpRequestAborted) {
if (file) {
file->close();
file->remove();
delete file;
file = 0;
}
reply->deleteLater();
return;
}
// download finished normally
file->flush();
file->close();
// get redirection url
QVariant redirectionTarget = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
if (reply->error()) {
file->remove();
QMessageBox::information(this, tr("HTTP"),
tr("Download failed: %1.")
.arg(reply->errorString()));
} else if (!redirectionTarget.isNull()) {
QUrl newUrl = url.resolved(redirectionTarget.toUrl());
if (QMessageBox::question(this, tr("HTTP"),
tr("Redirect to %1 ?").arg(newUrl.toString()),
QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes) {
url = newUrl;
reply->deleteLater();
file->open(QIODevice::WriteOnly);
file->resize(0);
startRequest(url);
return;
}
} else {
QString fileName = QFileInfo(QUrl(qInputLink).path()).fileName();
}
reply->deleteLater();
reply = 0;
delete file;
file = 0;
manager = 0;
}
// During the download progress, it can be canceled
void fAppDownloadDialog::cancelDownload()
{
httpRequestAborted = true;
reply->abort();
this->close();
}