if (QCanBus::instance()->plugins().contains(QStringLiteral("vectorcan"))) {
QString errorString;
QCanBusDevice *device = QCanBus::instance()->createDevice(
QStringLiteral("vectorcan"), QStringLiteral("can0"), &errorString);
if (!device) {
// Error handling goes here
qDebug() << errorString;
} else {
device->configurationParameter(QCanBusDevice::CanFdKey).toInt();
device->setConfigurationParameter(QCanBusDevice::BitRateKey, QVariant::fromValue(250000));
device->setConfigurationParameter(QCanBusDevice::CanFdKey, QVariant(true));
qInfo() << "connect parameter:" << device->configurationParameter(QCanBusDevice::BitRateKey).toInt() <<
device->configurationParameter(QCanBusDevice::CanFdKey).toInt();
QCanBusFrame frame;
frame.setFrameId(510);
QByteArray payload("4010D113123");
frame.setPayload(payload);
qInfo() << device->writeFrame(frame);
}
}**strong text**
I have tried to use setConfigurationParameter API to change the canfd,but it doesn't work. And this api can change the bitrate parameter. I don't kown why it doesn't work.
Related
I'm new in C++ also with QT, my current QT version is 5.5.1.
I have an issue when using connect with QNetworkReply and QNetworkAccessManager. When I try to assign a variable from another file to data fetched from API, it always calls the function first before connecting to the API so that the variable is always empty. Can you guys help me?
void NioshFunc::fetchDataFromAPI(){
QUrl url;
QUrlQuery querystr;
querystr.addQueryItem("$format","json");
url.setScheme("https");
url.setHost("example.com");
url.setPath("/aaaa/dataset");
url.setQuery(querystr);
QNetworkRequest request;
request.setUrl(url);
request.setRawHeader("KeyId", "xxx-xxx-xxx");
reply = manager->get(request);
connect(reply, &QNetworkReply::readyRead, this, &NioshFunc::readyRead);
connect(reply, &QNetworkReply::finished, this, &NioshFunc::finished);
}
void NioshFunc::readyRead(){
dataBuffer.append(reply->readAll());
}
void NioshFunc::finished(){
if(reply->error())
{
qDebug() << "ERROR!";
qDebug() << reply->errorString();
qDebug() << reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
qDebug() << reply->attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString();
}else{
qDebug() << "SUCCESS";
qDebug() << reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
qDebug() << reply->attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString();
nioshWPDataFromAPI = QJsonDocument::fromJson(dataBuffer);
qDebug() << nioshWPDataFromAPI;
dataBuffer.clear();
}
reply->deleteLater();
}
bool NioshFunc::parse(){
Globals *g = Globals::getHandle();
if (nioshWPDataFromAPI.isEmpty() || nioshWPDataFromAPI.isNull()) return false;
QVariantMap root = nioshWPDataFromAPI.toVariant().toMap();
if (root.isEmpty()) return false;
QVariantMap d = root["d"].toMap();
if (d.isEmpty()) return false;
QVariantList results = d["results"].toList();
if (results.isEmpty()) return false;
foreach (QVariant varResult, results)
{
QVariantMap result = varResult.toMap();
if (result.isEmpty()) return false;
g->struct_tableColumn.input.duration = result["Duration"].toString();
g->struct_tableColumn.input.id = result["Id"].toString();
if (id.isEmpty() || id.isNull()) return false;
g->struct_tableColumn.input.load_cumul_Limit = result["LoadCumulLimit"].toString();
g->struct_tableColumn.input.Notes = result["Notes"].toString();
qDebug() << g->struct_tableColumn.input.id << g->struct_tableColumn.input.duration << g->struct_tableColumn.input.load_cumul_Limit << g->struct_tableColumn.input.Notes; // "it is empty for all variable from globals file.
}
return true;
}
When I can function fetchDataFromAPI() and call function parse() in another file named globals, that is always called 2 these functions first before connecting to API, so that the variable named "nioshWPDataFromAPI" is always empty. But when I read nioshWPDataFromAPI in function finished(), it still has data, but only in function finished(). Could you guys help me? Sorry if my question is not too clear for you guys
Good day.
Has anyone tried QMediaPlayer in Qt 6.2 already?
I'm trying this code, but Media Status always remains as "NoMedia" and no any sound :).
Full test project: https://github.com/avttrue/MediaPlayerTest
#include "mainwindow.h"
#include <QDebug>
#include <QBuffer>
#include <QFile>
#include <QAudioOutput>
#include <QMediaPlayer>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QFile file("../test/Bankrobber.mp3");
if(!file.open(QIODevice::ReadOnly))
qDebug() << "File not opened";
qDebug() << "File size:" << file.size(); // File size: 11181085
QByteArray ba = file.readAll();
qDebug() << "ByteArray size:" << ba.size(); // ByteArray size: 11181085
QBuffer* buffer = new QBuffer(this);
buffer->setData(ba);
if(!buffer->open(QIODevice::ReadOnly))
qDebug() << "Buffer not opened";
qDebug() << "Buffer size:" << buffer->size(); // Buffer size: 11181085
buffer->seek(qint64(0));
auto audioOutput = new QAudioOutput(this);
auto player = new QMediaPlayer(this);
player->setAudioOutput(audioOutput);
audioOutput->setVolume(50);
player->setSourceDevice(buffer);
qDebug() << "Device:" << player->sourceDevice(); // Device: QBuffer(0x563180493020)
QObject::connect(player, &QMediaPlayer::mediaStatusChanged,
[=](QMediaPlayer::MediaStatus status)
{ qDebug() << "MediaStatus:" << player->mediaStatus() << "|" << status; });
QObject::connect(player, &QMediaPlayer::errorOccurred,
[=](QMediaPlayer::Error error)
{ qDebug() << "Error:" << player->errorString() << "|" << error; });
QObject::connect(player, &QMediaPlayer::playbackStateChanged,
[=](QMediaPlayer::PlaybackState state)
{ qDebug() << "PlaybackState:" << player->playbackState() << "|" << state; });
player->play();
qDebug() << "MediaStatus:" << player->mediaStatus(); // MediaStatus: QMediaPlayer::NoMedia
}
As the docs points out:
void QMediaPlayer::setSourceDevice(QIODevice *device, const QUrl
&sourceUrl = QUrl())
Sets the current source device.
The media data will be read from device. The sourceUrl can be provided
to resolve additional information about the media, mime type etc. The
device must be open and readable.
For macOS the device should also be seek-able.
Note: This function returns immediately after recording the specified
source of the media. It does not wait for the media to finish loading
and does not check for errors. Listen for the mediaStatusChanged() and
error() signals to be notified when the media is loaded, and if an
error occurs during loading.
(emphasis mine)
QMediaPlayer does not know how to deduce the file format so it does not load it. The solution is to point out that it is an mp3:
player->setSourceDevice(buffer, QUrl("foo.mp3"));
The function setSourceDevice() you are using isn't doing what you think?
Maybe you wanted setSource() instead?
Qt has great documentation:
https://doc.qt.io/qt-6/qmediaplayer.html#setSourceDevice
Even good examples:
player = new QMediaPlayer;
audioOutput = new QAudioOutput;
player->setAudioOutput(audioOutput);
connect(player, SIGNAL(positionChanged(qint64)), this, SLOT(positionChanged(qint64)));
player->setSource(QUrl::fromLocalFile("/Users/me/Music/coolsong.mp3"));
audioOutput->setVolume(50);
player->play();
Ref.
https://doc.qt.io/qt-6/qmediaplayer.html#details
May be this is as variant, but i think it not good:
QTemporaryFile tfile;
if (!tfile.open())
qDebug() << "TemporaryFile not opened";
else
{
qDebug() << "TemporaryFile writed:" << tfile.write(ba);
if(tfile.size() != ba.size())
qDebug() << "TemporaryFile not complited";
else
player->setSource(QUrl::fromLocalFile(tfile.fileName()));
}
Im trying to find out what goes wrong when doing a get request in qt.
I have the following slots attached to my networkmanager:
connect(mgr,SIGNAL(finished(QNetworkReply*)),this,SLOT(requestFinished(QNetworkReply*)));
connect(mgr, SIGNAL(error(QNetworkReply::NetworkError)),
this, SLOT(slotError(QNetworkReply::NetworkError)));
The request finished is like:
void FirebaseInteractor::requestFinished(QNetworkReply *rep)
{
QVariant statusCode = rep->attribute( QNetworkRequest::HttpStatusCodeAttribute );
int status = statusCode.toInt();
if ( status != 200 )
{
QString reason = rep->attribute( QNetworkRequest::HttpReasonPhraseAttribute ).toString();
qDebug() << "Pushnotification Request failed : " <<reason;
}
else{
qDebug() << "Pushnotification has been send: ";
}
if ( !statusCode.isValid() )
{
QString status = statusCode.toString(); // or status_code.toInt();
qDebug() << "Failing " << status;
int code = statusCode.toInt();
qDebug() << "Pushnotification Request failed invalid status code." << QString::number(code);
QString reason = rep->attribute( QNetworkRequest::HttpReasonPhraseAttribute ).toString();
qDebug() << "reason " << reason;
return;
}
}
However Status is always empty Failing and reason is printed but there is no value after it (i was expecting a reason e.g. timeout, 401 etc).
I also tried:
int status = statusCode.toInt();
if ( status != 200 )
{
QString reason = rep->attribute( QNetworkRequest::HttpReasonPhraseAttribute ).toString();
qDebug() << "Pushnotification Request failed : " <<reason;
}
else{
qDebug() << "Pushnotification has been send: ";
}
But all reasons/codes are empty.
I also added:
void FirebaseInteractor::slotError(QNetworkReply::NetworkError error)
{
qDebug() << "slotError" << error;
}
but this is not called.
How can I find out whats going wrong?
You can get the error directly using:
qDebug() << reply->error();
This won't work if the network request never happened:
if ( !statusCode.isValid() )
Because this means that the QVariant itself is invalid and has type QMetaType::UnknownType Documentation. Hence it will not give any information about what went wrong in the http request. To fix this, here's a simple example:
if (statusCode.isValid()) { // it needs to be valid
qDebug() << "Status Code: " << statusCode.toString();
}
Alternatively, you can switch on QNetworkReply::Error()
void FirebaseInteractor::requestFinished(QNetworkReply *rep)
{
switch (rep->error())
{
case QNetworkReply::NoError:
// No error
return;
case QNetworkReply::TimeoutError:
{
auto httpStatus =
reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
auto httpStatusMessage = reply->attribute(
QNetworkRequest::HttpReasonPhraseAttribute).toByteArray();
//...
break;
}
}
}
I would have to send Modbus request for specific data, my problem is that I have to use mobile communication, wifi, connect to a custom electronic card, which is right in Modbus RTU.
My working code connecting to the electronic board:
#include "connessione.h"
#include <QModbusTcpClient>
#include <QVariant>
#include <QModbusDataUnit>
#include <QDebug>
connessione::connessione(QObject *parent) : QObject(parent)
{
qDebug() << "here debug " << "ok";
clientX = new QModbusTcpClient();
clientX->setConnectionParameter(QModbusDevice::NetworkAddressParameter, "192.168.222.1");
clientX->setConnectionParameter(QModbusDevice::NetworkPortParameter, 5555);
if (clientX->connectDevice())
{
qDebug() << "connected: " << clientX->state();
}
else
{
qDebug() << "ERRORE" << clientX->errorString();
}
}
void connessione::clickButton(){
QModbusDataUnit readUnit(QModbusDataUnit::HoldingRegisters, 0, 1); // just read input register 40006
//qDebug() << "readUnit" << readUnit.RegisterType;
qDebug() << "readUnit" << clientX->state();
if (auto *reply = clientX->sendReadRequest(readUnit, 255)) // client id 255
{
if (!reply->isFinished())
{
// connect the finished signal of the request to your read slot
qDebug() << "connected" << reply->errorString();
connect(reply, &QModbusReply::finished, this, &connessione::readReady);
}
else
{
qDebug() << "Errore" << reply->errorString();
delete reply; // broadcast replies return immediately
}
}
else
{
qDebug() << "Errore" << reply->errorString();
// request error
}
}
void connessione::readReady()
{
QModbusReply *reply = qobject_cast<QModbusReply *>(sender());
if (!reply)
return;
if (reply->error() == QModbusDevice::NoError)
{
const QModbusDataUnit unit = reply->result();
int startAddress = unit.startAddress(); // the start address,
int value = unit.value(0); // value of the start address + 0
qDebug() << "NESSUN ERRORE" << reply->errorString();
}
else
{
qDebug() << "Errore readReady" << reply->errorString();
// reply error
}
reply->deleteLater(); // delete the reply
}
log string TCP sent:
D/libmodbusMobile.so( 8042): (null):0 ((null)): qt.modbus: (TCP
client) Sent TCP PDU: 0x0300000001 with tId: 2
this is right: 0x0300000001
But unfortunately, my electronic card, the integrated firmware I can not modify, is right with Modbus RTU, so I should change 0x0300000001 to 0x010300000001C1C2 where C1 and C2 are the checksums.
I believe that QModbusDataUnit generate buffer to send. So how to change it? Exist manual solution where I build the buffer?
how to change it and create custom send buffer like the example?
Thanks
I am trying to read my SerialPort based on the
http://doc.qt.io/qt-5/qtserialport-creadersync-main-cpp.html
example:
QCoreApplication coreApplication(argc, argv);
QTextStream standardOutput(stdout);
QSerialPort serialPort;
QByteArray readData;
serialPort.setPortName("ttyS4");
serialPort.setBaudRate(QSerialPort::Baud9600);
serialPort.setDataBits(QSerialPort::Data8);
serialPort.setParity(QSerialPort::EvenParity);
serialPort.setStopBits(QSerialPort::OneStop);
serialPort.setFlowControl(QSerialPort::NoFlowControl);
if (!serialPort.open(QIODevice::ReadOnly)) {
standardOutput << QObject::tr("Failed to open port") << endl;
return 1;
}
while (serialPort.waitForReadyRead(5000))
readData.append(serialPort.readAll());
qDebug() << readData;
return coreApplication.exec();
I also tried reading Data based on the http://doc.qt.io/qt-5/qtserialport-cwriterasync-example.html example:
Main:
int main(int argc, char *argv[])
{
QCoreApplication coreApplication(argc, argv);
QTextStream standardOutput(stdout);
QSerialPort serialPort;
serialPort.setPortName("ttyS4");
serialPort.setBaudRate(QSerialPort::Baud9600);
serialPort.setDataBits(QSerialPort::Data8);
serialPort.setParity(QSerialPort::EvenParity);
serialPort.setStopBits(QSerialPort::OneStop);
serialPort.setFlowControl(QSerialPort::NoFlowControl);
if (!serialPort.open(QIODevice::ReadOnly)) {
standardOutput << QObject::tr("Failed to open port") << endl;
return 1;
}
SerialPortReader serialPortReader(&serialPort);
return coreApplication.exec();
}
serialPortReader:
SerialPortReader::SerialPortReader(QSerialPort *serialPort, QObject *parent):QObject(parent), m_serialPort(serialPort), m_standardOutput(stdout)
{
connect(m_serialPort, SIGNAL(readyRead()), SLOT(handleReadyRead()));
connect(m_serialPort, SIGNAL(error(QSerialPort::SerialPortError)), SLOT(handleError(QSerialPort::SerialPortError)));
connect(&m_timer, SIGNAL(timeout()), SLOT(handleTimeout()));
m_counter = 0;
m_timer.start(5000);
}
SerialPortReader::~SerialPortReader()
{
}
void SerialPortReader::handleReadyRead()
{ m_counter++;
m_readData.append(m_serialPort->readAll());
qDebug()<< m_serialPort->readAll();
qDebug() << "triggered" << m_counter;
}
void SerialPortReader::handleTimeout()
{
if (m_readData.isEmpty()) {
m_standardOutput << QObject::tr("No data was currently available for reading from port %1").arg(m_serialPort->portName()) << endl;
} else {
m_standardOutput << QObject::tr("Data successfully received from port %1").arg(m_serialPort->portName()) << endl;
m_standardOutput << m_readData << endl;
}
QCoreApplication::quit();
}
void SerialPortReader::handleError(QSerialPort::SerialPortError serialPortError)
{
if (serialPortError == QSerialPort::ReadError) {
m_standardOutput << QObject::tr("An I/O error occurred while reading the data from port %1, error: %2").arg(m_serialPort->portName()).arg(m_serialPort->errorString()) << endl;
QCoreApplication::exit(1);
}
}
But when I send data to this COM port (with same serialPort Settings for Sender), not all of the data is received.
With the MSB-RS232 I can check which data really has been sendet to the port and there is nothing wrong with my sender.
For testing I am sending
main:
QString alpha = "abcdefghijklmnopqrstuvwxyz123456789";
handler.writetoPort(alpha);
handler.cpp:
void SerialHandler::writetoPort(QString x)
{
QTextCodec *codec = QTextCodec::codecForName("UTF-8");
QByteArray encodedVar = codec->fromUnicode(x);
writetoPort(encodedVar);
}
void SerialHandler::writetoPort(const QByteArray x)
{
serial.write(x);
serial.waitForBytesWritten(-1);
}
The result of this is the output:
abyz123456789 or abcdklmnopqrstuvwxyz123456789 or abcdefghijklm or ...
It's always different.
Does anyone have a clue what is going on here?
Thank you for reading my long post.
--added 17.07--
This might be mandatory for my problem:
The code has to run on a microprocessor.
CPU: Atmel -AT91SAM9X25 - ARM926(ARMv5) - 400MHz
RAM: 32 MB
Linux Kernel Version: 3.9.0
QT Version: 5.4.1 (cross compiled)
both the async and sync example are working perfectly fine on my Windows PC.
Maybe this will help
void SerialPortReader::handleReadyRead()
{
m_counter++;
while (m_serialPort->bytesAvailable())
{
m_readData.append(m_serialPort->readAll());
}
qDebug()<< m_readData;
qDebug() << "triggered" << m_counter;
}
I tried the exact same Projekt on a different Board and everything works smoothly.
I think the COM Port of the old Board might have been damaged.
Will mark this as resolved but I can't tell what the true problem really was.