i'm trying to port my program (python(PyQt6) >> C++(Qt6)) In python i have this:
requests.post(f"{self.server}/uploadChunk/{self.rnum}?" + urlencode(
{"index": cnum, "findex": findex, "token": self.token, "Hash": out_hash}),
data=chunk, verify=False)
I'm trying to port it to C++ and get this:
void Tunnel::sendChunk(quint64 findex, quint64 index, QByteArray chunk, QString hash) {
qDebug() << "T: sendChunk";
TunnelWorker *worker = (TunnelWorker*)this->sender();
quint64 id = worker->Id;
QNetworkAccessManager *manager = (*this->Managers)[id][1];
QString url = this->server + "/uploadChunk/" + QString::number(this->rnum) + "?token=" + this->token;
if ((int)index != -1) {
url += "&findex=" + QString::number(findex) + "&index=" + QString::number(index) + "&hash=" + hash;
}
QNetworkRequest req = QNetworkRequest(url);
req.setHeader(QNetworkRequest::ContentTypeHeader, "multipart/form-data");
QNetworkReply *reply = manager->post(req, chunk);
QObject::connect(reply, &QNetworkReply::uploadProgress, worker, &TunnelWorker::sendChunkProgressHandler);
}
In console, i see that file is uploading:
TW: sendChunkProgressHandler
T: addUploadProgress "16384"
TW: sendChunkProgressHandler
T: addUploadProgress "2080768"
TW: sendChunkProgressHandler
TW: sendChunkReplyHandler: chunk uploaded
T: addUploadProgress "0"
: My Chunksize is 2MiB, (2**21 Bytes), i see that all 2MiB uploaded. I have my server on Flask:
class Tunnel:
...
def downloadchunk(self, data, json):
print('-' * 20)
print(f"DATA: {len(data)}")
print('-' * 20)
...
...
# end of class Tunnel
...
@app.route("/uploadChunk/<int:rnum>", methods=['GET', 'POST'])
def upload_chunk(rnum):
json = request.args
token = "00000000" if "token" not in json else json["token"]
if checkToken(rnum, "Up", token):
rnums[rnum].activity()
data = request.data
return rnums[rnum].downloadchunk(data, json)
else:
return {"status": "Access denied"}
...
If i'm trying my C++ code, i get this in python console of my flask server:
--------------------
DATA: 0
--------------------
If i'm trying my python code, i get this...:
--------------------
DATA: 2097152
--------------------
That i need to fix uploading in my c++ code?
UDP minimal reproducible example: main.cpp
#include <QCoreApplication>
#include <QDebug>
#include <QFile>
#include <QNetworkAccessManager>
#include <QNetworkReply>
int main(int argc, char *argv[])
{
quint64 Kb = 1024;
quint64 Mb = 1024 * Kb;
QCoreApplication a(argc, argv);
QFile file("img.png");
file.open(QFile::ReadOnly);
QByteArray chunk = file.read(2 * Mb);
qDebug() << "Chunk:" << chunk.length();
QNetworkAccessManager *manager = new QNetworkAccessManager();
QUrl url = QUrl("http://127.0.0.1:5000/");
QNetworkRequest req = QNetworkRequest(url);
req.setHeader(QNetworkRequest::ContentTypeHeader, "multipart/form-data");
qDebug() << "Url:" << url.url();
QObject::connect(manager, &QNetworkAccessManager::finished, [](QNetworkReply *reply) {qDebug() << "Uploading Finish";});
QNetworkReply *reply = manager->post(req, chunk);
QObject::connect(reply, &QNetworkReply::uploadProgress, [](quint64 uploaded, quint64 total) {qDebug() << "Uploading" << QString::number(uploaded) << "/" << QString::number(total);});
return a.exec();
}
test.pro:
QT -= gui
QT += core
QT += network
CONFIG += c++17 console
CONFIG -= app_bundle
# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
main.cpp
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
server.py:
from flask import Flask, request
app = Flask(__name__)
@app.route("/", methods=["GET", "POST"])
def fun():
print("DATA:", len(request.data))
return {}
if __name__ == '__main__':
app.run(host='0.0.0.0', port=5000)
UDP2: My console output(C++):
Chunk: 2097152
Url: "http://127.0.0.1:5000/"
Uploading "16384" / "2097152"
Uploading "2097152" / "2097152"
Uploading "0" / "0"
Uploading Finish
My console output(Python):
* Running on http://127.0.0.1:5000 (Press CTRL+C to quit)
* Serving Flask app 'SOF.py' (lazy loading)
* Environment: development
* Debug mode: off
127.0.0.1 - - [17/May/2022 15:13:02] "POST / HTTP/1.1" 200 -
DATA: 0
UDP3: test.py
import requests
with open("img.png", "rb") as f:
data = f.read(2*1024*1024)
requests.post("http://127.0.0.1:5000/", data=data)
server.py(Output):
* Running on http://127.0.0.1:5000 (Press CTRL+C to quit)
* Serving Flask app 'SOF.py' (lazy loading)
* Environment: development
* Debug mode: off
127.0.0.1 - - [17/May/2022 15:31:01] "POST / HTTP/1.1" 200 -
DATA: 2097152
The problem is that you are indicating that the content-type is application/x-www-form-urlencoded (it is equivalent to multipart/form-data) but you are not sending a form but raw data so the server tries to decode the data but it does not meet the standard so it returns 0 bytes. The solution is to use a valid content-type, for example application/octet-stream, you can also use QMimeDatabase to get the content-type:
#include <QCoreApplication>
#include <QDebug>
#include <QFile>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QMimeDatabase>
#include <QMimeType>
int main(int argc, char *argv[])
{
quint64 Kb = 1024;
quint64 Mb = 1024 * Kb;
QCoreApplication a(argc, argv);
QFile file("img.png");
if(!file.open(QFile::ReadOnly)){
qDebug() << "failed";
return EXIT_FAILURE;
}
QByteArray chunk = file.read(2 * Mb);
qDebug() << "Chunk:" << chunk.length();
QNetworkAccessManager manager;
QUrl url = QUrl("http://127.0.0.1:5000/");
QMimeDatabase db;
QMimeType mime = db.mimeTypeForData(&file);
QNetworkRequest req(url);
req.setHeader(QNetworkRequest::ContentTypeHeader, mime.name());
// OR
// req.setHeader(QNetworkRequest::ContentTypeHeader, "application/octet-stream");
qDebug() << "Url:" << req.url();
QObject::connect(&manager, &QNetworkAccessManager::finished, [](QNetworkReply * /*reply*/) {
qDebug() << "Uploading Finish";
QCoreApplication::quit();
});
QNetworkReply *reply = manager.post(req, chunk);
QObject::connect(reply, &QNetworkReply::uploadProgress, [](quint64 uploaded, quint64 total) {
qDebug() << "Uploading" << QString::number(uploaded) << "/" << QString::number(total);
});
return a.exec();
}