///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see . //
///////////////////////////////////////////////////////////////////////////////////
#include
#include
#include
#include
#include
#include
#include "SWGDeviceSettings.h"
#include "SWGDeviceState.h"
#include "device/deviceapi.h"
#include "dsp/dspcommands.h"
#include "dsp/dspengine.h"
#include "dsp/devicesamplesource.h"
#include "dsp/filerecord.h"
#include "testmithread.h"
#include "testmi.h"
MESSAGE_CLASS_DEFINITION(TestMI::MsgConfigureTestSource, Message)
MESSAGE_CLASS_DEFINITION(TestMI::MsgFileRecord, Message)
MESSAGE_CLASS_DEFINITION(TestMI::MsgStartStop, Message)
TestMI::TestMI(DeviceAPI *deviceAPI) :
m_deviceAPI(deviceAPI),
m_settings(),
m_testSourceThread(0),
m_deviceDescription(),
m_running(false),
m_masterTimer(deviceAPI->getMasterTimer())
{
m_fileSink = new FileRecord(QString("test_%1.sdriq").arg(m_deviceAPI->getDeviceUID()));
m_deviceAPI->addAncillarySink(m_fileSink);
m_sampleSinkFifos.push_back(SampleSinkFifo(96000 * 4));
m_networkManager = new QNetworkAccessManager();
connect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
}
TestMI::~TestMI()
{
disconnect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
delete m_networkManager;
if (m_running) {
stop();
}
m_deviceAPI->removeAncillarySink(m_fileSink);
delete m_fileSink;
}
void TestMI::destroy()
{
delete this;
}
void TestMI::init()
{
applySettings(m_settings, true);
}
bool TestMI::start()
{
QMutexLocker mutexLocker(&m_mutex);
if (m_running) stop();
m_testSourceThread = new TestMIThread(&m_sampleSinkFifos[0]);
m_testSourceThread->setSamplerate(m_settings.m_sampleRate);
m_testSourceThread->startStop(true);
mutexLocker.unlock();
applySettings(m_settings, true);
m_running = true;
return true;
}
void TestMI::stop()
{
QMutexLocker mutexLocker(&m_mutex);
if (m_testSourceThread != 0)
{
m_testSourceThread->startStop(false);
m_testSourceThread->deleteLater();
m_testSourceThread = 0;
}
m_running = false;
}
QByteArray TestMI::serialize() const
{
return m_settings.serialize();
}
bool TestMI::deserialize(const QByteArray& data)
{
bool success = true;
if (!m_settings.deserialize(data))
{
m_settings.resetToDefaults();
success = false;
}
MsgConfigureTestSource* message = MsgConfigureTestSource::create(m_settings, true);
m_inputMessageQueue.push(message);
if (m_guiMessageQueue)
{
MsgConfigureTestSource* messageToGUI = MsgConfigureTestSource::create(m_settings, true);
m_guiMessageQueue->push(messageToGUI);
}
return success;
}
const QString& TestMI::getDeviceDescription() const
{
return m_deviceDescription;
}
int TestMI::getSourceSampleRate(int index) const
{
(void) index;
return m_settings.m_sampleRate/(1<push(messageToGUI);
}
}
bool TestMI::handleMessage(const Message& message)
{
if (MsgConfigureTestSource::match(message))
{
MsgConfigureTestSource& conf = (MsgConfigureTestSource&) message;
qDebug() << "TestMI::handleMessage: MsgConfigureTestSource";
bool success = applySettings(conf.getSettings(), conf.getForce());
if (!success)
{
qDebug("TestMI::handleMessage: config error");
}
return true;
}
else if (MsgFileRecord::match(message))
{
MsgFileRecord& conf = (MsgFileRecord&) message;
qDebug() << "TestMI::handleMessage: MsgFileRecord: " << conf.getStartStop();
if (conf.getStartStop())
{
if (m_settings.m_fileRecordName.size() != 0) {
m_fileSink->setFileName(m_settings.m_fileRecordName);
} else {
m_fileSink->genUniqueFileName(m_deviceAPI->getDeviceUID());
}
m_fileSink->startRecording();
}
else
{
m_fileSink->stopRecording();
}
return true;
}
else if (MsgStartStop::match(message))
{
MsgStartStop& cmd = (MsgStartStop&) message;
qDebug() << "TestMI::handleMessage: MsgStartStop: " << (cmd.getStartStop() ? "start" : "stop");
if (cmd.getStartStop())
{
if (m_deviceAPI->initDeviceEngine())
{
m_deviceAPI->startDeviceEngine();
}
}
else
{
m_deviceAPI->stopDeviceEngine();
}
if (m_settings.m_useReverseAPI) {
webapiReverseSendStartStop(cmd.getStartStop());
}
return true;
}
else
{
return false;
}
}
bool TestMI::applySettings(const TestMISettings& settings, bool force)
{
QList reverseAPIKeys;
if ((m_settings.m_autoCorrOptions != settings.m_autoCorrOptions) || force)
{
reverseAPIKeys.append("autoCorrOptions");
switch(settings.m_autoCorrOptions)
{
case TestMISettings::AutoCorrDC:
m_deviceAPI->configureCorrections(true, false);
break;
case TestMISettings::AutoCorrDCAndIQ:
m_deviceAPI->configureCorrections(true, true);
break;
case TestMISettings::AutoCorrNone:
default:
m_deviceAPI->configureCorrections(false, false);
break;
}
}
if ((m_settings.m_sampleRate != settings.m_sampleRate) || force)
{
reverseAPIKeys.append("sampleRate");
if (m_testSourceThread != 0)
{
m_testSourceThread->setSamplerate(settings.m_sampleRate);
qDebug("TestMI::applySettings: sample rate set to %d", settings.m_sampleRate);
}
}
if ((m_settings.m_log2Decim != settings.m_log2Decim) || force)
{
reverseAPIKeys.append("log2Decim");
if (m_testSourceThread != 0)
{
m_testSourceThread->setLog2Decimation(settings.m_log2Decim);
qDebug() << "TestMI::applySettings: set decimation to " << (1<setFcPos((int) settings.m_fcPos);
m_testSourceThread->setFrequencyShift(frequencyShift);
qDebug() << "TestMI::applySettings:"
<< " center freq: " << settings.m_centerFrequency << " Hz"
<< " device center freq: " << deviceCenterFrequency << " Hz"
<< " device sample rate: " << devSampleRate << "Hz"
<< " Actual sample rate: " << devSampleRate/(1<setAmplitudeBits(settings.m_amplitudeBits);
}
}
if ((m_settings.m_dcFactor != settings.m_dcFactor) || force)
{
reverseAPIKeys.append("dcFactor");
if (m_testSourceThread != 0) {
m_testSourceThread->setDCFactor(settings.m_dcFactor);
}
}
if ((m_settings.m_iFactor != settings.m_iFactor) || force)
{
reverseAPIKeys.append("iFactor");
if (m_testSourceThread != 0) {
m_testSourceThread->setIFactor(settings.m_iFactor);
}
}
if ((m_settings.m_qFactor != settings.m_qFactor) || force)
{
reverseAPIKeys.append("qFactor");
if (m_testSourceThread != 0) {
m_testSourceThread->setQFactor(settings.m_qFactor);
}
}
if ((m_settings.m_phaseImbalance != settings.m_phaseImbalance) || force)
{
reverseAPIKeys.append("phaseImbalance");
if (m_testSourceThread != 0) {
m_testSourceThread->setPhaseImbalance(settings.m_phaseImbalance);
}
}
if ((m_settings.m_sampleSizeIndex != settings.m_sampleSizeIndex) || force)
{
reverseAPIKeys.append("sampleSizeIndex");
if (m_testSourceThread != 0) {
m_testSourceThread->setBitSize(settings.m_sampleSizeIndex);
}
}
if ((m_settings.m_sampleRate != settings.m_sampleRate)
|| (m_settings.m_centerFrequency != settings.m_centerFrequency)
|| (m_settings.m_log2Decim != settings.m_log2Decim)
|| (m_settings.m_fcPos != settings.m_fcPos) || force)
{
int sampleRate = settings.m_sampleRate/(1<handleMessage(*notif); // forward to file sink
m_deviceAPI->getDeviceEngineInputMessageQueue()->push(notif);
}
if ((m_settings.m_modulationTone != settings.m_modulationTone) || force)
{
reverseAPIKeys.append("modulationTone");
if (m_testSourceThread != 0) {
m_testSourceThread->setToneFrequency(settings.m_modulationTone * 10);
}
}
if ((m_settings.m_modulation != settings.m_modulation) || force)
{
reverseAPIKeys.append("modulation");
if (m_testSourceThread != 0)
{
m_testSourceThread->setModulation(settings.m_modulation);
if (settings.m_modulation == TestMISettings::ModulationPattern0) {
m_testSourceThread->setPattern0();
} else if (settings.m_modulation == TestMISettings::ModulationPattern1) {
m_testSourceThread->setPattern1();
} else if (settings.m_modulation == TestMISettings::ModulationPattern2) {
m_testSourceThread->setPattern2();
}
}
}
if ((m_settings.m_amModulation != settings.m_amModulation) || force)
{
reverseAPIKeys.append("amModulation");
if (m_testSourceThread != 0) {
m_testSourceThread->setAMModulation(settings.m_amModulation / 100.0f);
}
}
if ((m_settings.m_fmDeviation != settings.m_fmDeviation) || force)
{
reverseAPIKeys.append("fmDeviation");
if (m_testSourceThread != 0) {
m_testSourceThread->setFMDeviation(settings.m_fmDeviation * 100.0f);
}
}
if (settings.m_useReverseAPI)
{
qDebug("TestMI::applySettings: call webapiReverseSendSettings");
bool fullUpdate = ((m_settings.m_useReverseAPI != settings.m_useReverseAPI) && settings.m_useReverseAPI) ||
(m_settings.m_reverseAPIAddress != settings.m_reverseAPIAddress) ||
(m_settings.m_reverseAPIPort != settings.m_reverseAPIPort) ||
(m_settings.m_reverseAPIDeviceIndex != settings.m_reverseAPIDeviceIndex);
webapiReverseSendSettings(reverseAPIKeys, settings, fullUpdate || force);
}
m_settings = settings;
return true;
}
int TestMI::webapiRunGet(
SWGSDRangel::SWGDeviceState& response,
QString& errorMessage)
{
(void) errorMessage;
m_deviceAPI->getDeviceEngineStateStr(*response.getState());
return 200;
}
int TestMI::webapiRun(
bool run,
SWGSDRangel::SWGDeviceState& response,
QString& errorMessage)
{
(void) errorMessage;
m_deviceAPI->getDeviceEngineStateStr(*response.getState());
MsgStartStop *message = MsgStartStop::create(run);
m_inputMessageQueue.push(message);
if (m_guiMessageQueue) // forward to GUI if any
{
MsgStartStop *msgToGUI = MsgStartStop::create(run);
m_guiMessageQueue->push(msgToGUI);
}
return 200;
}
int TestMI::webapiSettingsGet(
SWGSDRangel::SWGDeviceSettings& response,
QString& errorMessage)
{
(void) errorMessage;
response.setTestMiSettings(new SWGSDRangel::SWGTestMISettings());
response.getTestMiSettings()->init();
webapiFormatDeviceSettings(response, m_settings);
return 200;
}
int TestMI::webapiSettingsPutPatch(
bool force,
const QStringList& deviceSettingsKeys,
SWGSDRangel::SWGDeviceSettings& response, // query + response
QString& errorMessage)
{
(void) errorMessage;
TestMISettings settings = m_settings;
if (deviceSettingsKeys.contains("centerFrequency")) {
settings.m_centerFrequency = response.getTestMiSettings()->getCenterFrequency();
}
if (deviceSettingsKeys.contains("frequencyShift")) {
settings.m_frequencyShift = response.getTestMiSettings()->getFrequencyShift();
}
if (deviceSettingsKeys.contains("sampleRate")) {
settings.m_sampleRate = response.getTestMiSettings()->getSampleRate();
}
if (deviceSettingsKeys.contains("log2Decim")) {
settings.m_log2Decim = response.getTestMiSettings()->getLog2Decim();
}
if (deviceSettingsKeys.contains("fcPos")) {
int fcPos = response.getTestMiSettings()->getFcPos();
fcPos = fcPos < 0 ? 0 : fcPos > 2 ? 2 : fcPos;
settings.m_fcPos = (TestMISettings::fcPos_t) fcPos;
}
if (deviceSettingsKeys.contains("sampleSizeIndex")) {
int sampleSizeIndex = response.getTestMiSettings()->getSampleSizeIndex();
sampleSizeIndex = sampleSizeIndex < 0 ? 0 : sampleSizeIndex > 1 ? 2 : sampleSizeIndex;
settings.m_sampleSizeIndex = sampleSizeIndex;
}
if (deviceSettingsKeys.contains("amplitudeBits")) {
settings.m_amplitudeBits = response.getTestMiSettings()->getAmplitudeBits();
}
if (deviceSettingsKeys.contains("autoCorrOptions")) {
int autoCorrOptions = response.getTestMiSettings()->getAutoCorrOptions();
autoCorrOptions = autoCorrOptions < 0 ? 0 : autoCorrOptions >= TestMISettings::AutoCorrLast ? TestMISettings::AutoCorrLast-1 : autoCorrOptions;
settings.m_sampleSizeIndex = (TestMISettings::AutoCorrOptions) autoCorrOptions;
}
if (deviceSettingsKeys.contains("modulation")) {
int modulation = response.getTestMiSettings()->getModulation();
modulation = modulation < 0 ? 0 : modulation >= TestMISettings::ModulationLast ? TestMISettings::ModulationLast-1 : modulation;
settings.m_modulation = (TestMISettings::Modulation) modulation;
}
if (deviceSettingsKeys.contains("modulationTone")) {
settings.m_modulationTone = response.getTestMiSettings()->getModulationTone();
}
if (deviceSettingsKeys.contains("amModulation")) {
settings.m_amModulation = response.getTestMiSettings()->getAmModulation();
};
if (deviceSettingsKeys.contains("fmDeviation")) {
settings.m_fmDeviation = response.getTestMiSettings()->getFmDeviation();
};
if (deviceSettingsKeys.contains("dcFactor")) {
settings.m_dcFactor = response.getTestMiSettings()->getDcFactor();
};
if (deviceSettingsKeys.contains("iFactor")) {
settings.m_iFactor = response.getTestMiSettings()->getIFactor();
};
if (deviceSettingsKeys.contains("qFactor")) {
settings.m_qFactor = response.getTestMiSettings()->getQFactor();
};
if (deviceSettingsKeys.contains("phaseImbalance")) {
settings.m_phaseImbalance = response.getTestMiSettings()->getPhaseImbalance();
};
if (deviceSettingsKeys.contains("fileRecordName")) {
settings.m_fileRecordName = *response.getTestMiSettings()->getFileRecordName();
}
if (deviceSettingsKeys.contains("useReverseAPI")) {
settings.m_useReverseAPI = response.getTestMiSettings()->getUseReverseApi() != 0;
}
if (deviceSettingsKeys.contains("reverseAPIAddress")) {
settings.m_reverseAPIAddress = *response.getTestMiSettings()->getReverseApiAddress();
}
if (deviceSettingsKeys.contains("reverseAPIPort")) {
settings.m_reverseAPIPort = response.getTestMiSettings()->getReverseApiPort();
}
if (deviceSettingsKeys.contains("reverseAPIDeviceIndex")) {
settings.m_reverseAPIDeviceIndex = response.getTestMiSettings()->getReverseApiDeviceIndex();
}
MsgConfigureTestSource *msg = MsgConfigureTestSource::create(settings, force);
m_inputMessageQueue.push(msg);
if (m_guiMessageQueue) // forward to GUI if any
{
MsgConfigureTestSource *msgToGUI = MsgConfigureTestSource::create(settings, force);
m_guiMessageQueue->push(msgToGUI);
}
webapiFormatDeviceSettings(response, settings);
return 200;
}
void TestMI::webapiFormatDeviceSettings(SWGSDRangel::SWGDeviceSettings& response, const TestMISettings& settings)
{
response.getTestMiSettings()->setCenterFrequency(settings.m_centerFrequency);
response.getTestMiSettings()->setFrequencyShift(settings.m_frequencyShift);
response.getTestMiSettings()->setSampleRate(settings.m_sampleRate);
response.getTestMiSettings()->setLog2Decim(settings.m_log2Decim);
response.getTestMiSettings()->setFcPos((int) settings.m_fcPos);
response.getTestMiSettings()->setSampleSizeIndex((int) settings.m_sampleSizeIndex);
response.getTestMiSettings()->setAmplitudeBits(settings.m_amplitudeBits);
response.getTestMiSettings()->setAutoCorrOptions((int) settings.m_autoCorrOptions);
response.getTestMiSettings()->setModulation((int) settings.m_modulation);
response.getTestMiSettings()->setModulationTone(settings.m_modulationTone);
response.getTestMiSettings()->setAmModulation(settings.m_amModulation);
response.getTestMiSettings()->setFmDeviation(settings.m_fmDeviation);
response.getTestMiSettings()->setDcFactor(settings.m_dcFactor);
response.getTestMiSettings()->setIFactor(settings.m_iFactor);
response.getTestMiSettings()->setQFactor(settings.m_qFactor);
response.getTestMiSettings()->setPhaseImbalance(settings.m_phaseImbalance);
if (response.getTestMiSettings()->getFileRecordName()) {
*response.getTestMiSettings()->getFileRecordName() = settings.m_fileRecordName;
} else {
response.getTestMiSettings()->setFileRecordName(new QString(settings.m_fileRecordName));
}
response.getTestMiSettings()->setUseReverseApi(settings.m_useReverseAPI ? 1 : 0);
if (response.getTestMiSettings()->getReverseApiAddress()) {
*response.getTestMiSettings()->getReverseApiAddress() = settings.m_reverseAPIAddress;
} else {
response.getTestMiSettings()->setReverseApiAddress(new QString(settings.m_reverseAPIAddress));
}
response.getTestMiSettings()->setReverseApiPort(settings.m_reverseAPIPort);
response.getTestMiSettings()->setReverseApiDeviceIndex(settings.m_reverseAPIDeviceIndex);
}
void TestMI::webapiReverseSendSettings(QList& deviceSettingsKeys, const TestMISettings& settings, bool force)
{
SWGSDRangel::SWGDeviceSettings *swgDeviceSettings = new SWGSDRangel::SWGDeviceSettings();
swgDeviceSettings->setDirection(0); // single Rx
swgDeviceSettings->setOriginatorIndex(m_deviceAPI->getDeviceSetIndex());
swgDeviceSettings->setDeviceHwType(new QString("TestSource"));
swgDeviceSettings->setTestMiSettings(new SWGSDRangel::SWGTestMISettings());
SWGSDRangel::SWGTestMISettings *swgTestMISettings = swgDeviceSettings->getTestMiSettings();
// transfer data that has been modified. When force is on transfer all data except reverse API data
if (deviceSettingsKeys.contains("centerFrequency") || force) {
swgTestMISettings->setCenterFrequency(settings.m_centerFrequency);
}
if (deviceSettingsKeys.contains("frequencyShift") || force) {
swgTestMISettings->setFrequencyShift(settings.m_frequencyShift);
}
if (deviceSettingsKeys.contains("sampleRate") || force) {
swgTestMISettings->setSampleRate(settings.m_sampleRate);
}
if (deviceSettingsKeys.contains("log2Decim") || force) {
swgTestMISettings->setLog2Decim(settings.m_log2Decim);
}
if (deviceSettingsKeys.contains("fcPos") || force) {
swgTestMISettings->setFcPos((int) settings.m_fcPos);
}
if (deviceSettingsKeys.contains("sampleSizeIndex") || force) {
swgTestMISettings->setSampleSizeIndex(settings.m_sampleSizeIndex);
}
if (deviceSettingsKeys.contains("amplitudeBits") || force) {
swgTestMISettings->setAmplitudeBits(settings.m_amplitudeBits);
}
if (deviceSettingsKeys.contains("autoCorrOptions") || force) {
swgTestMISettings->setAutoCorrOptions((int) settings.m_sampleSizeIndex);
}
if (deviceSettingsKeys.contains("modulation") || force) {
swgTestMISettings->setModulation((int) settings.m_modulation);
}
if (deviceSettingsKeys.contains("modulationTone")) {
swgTestMISettings->setModulationTone(settings.m_modulationTone);
}
if (deviceSettingsKeys.contains("amModulation") || force) {
swgTestMISettings->setAmModulation(settings.m_amModulation);
};
if (deviceSettingsKeys.contains("fmDeviation") || force) {
swgTestMISettings->setFmDeviation(settings.m_fmDeviation);
};
if (deviceSettingsKeys.contains("dcFactor") || force) {
swgTestMISettings->setDcFactor(settings.m_dcFactor);
};
if (deviceSettingsKeys.contains("iFactor") || force) {
swgTestMISettings->setIFactor(settings.m_iFactor);
};
if (deviceSettingsKeys.contains("qFactor") || force) {
swgTestMISettings->setQFactor(settings.m_qFactor);
};
if (deviceSettingsKeys.contains("phaseImbalance") || force) {
swgTestMISettings->setPhaseImbalance(settings.m_phaseImbalance);
};
if (deviceSettingsKeys.contains("fileRecordName") || force) {
swgTestMISettings->setFileRecordName(new QString(settings.m_fileRecordName));
}
QString channelSettingsURL = QString("http://%1:%2/sdrangel/deviceset/%3/device/settings")
.arg(settings.m_reverseAPIAddress)
.arg(settings.m_reverseAPIPort)
.arg(settings.m_reverseAPIDeviceIndex);
m_networkRequest.setUrl(QUrl(channelSettingsURL));
m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
QBuffer *buffer=new QBuffer();
buffer->open((QBuffer::ReadWrite));
buffer->write(swgDeviceSettings->asJson().toUtf8());
buffer->seek(0);
// qDebug("TestMI::webapiReverseSendSettings: %s", channelSettingsURL.toStdString().c_str());
// qDebug("TestMI::webapiReverseSendSettings: query:\n%s", swgDeviceSettings->asJson().toStdString().c_str());
// Always use PATCH to avoid passing reverse API settings
m_networkManager->sendCustomRequest(m_networkRequest, "PATCH", buffer);
delete swgDeviceSettings;
}
void TestMI::webapiReverseSendStartStop(bool start)
{
SWGSDRangel::SWGDeviceSettings *swgDeviceSettings = new SWGSDRangel::SWGDeviceSettings();
swgDeviceSettings->setDirection(0); // single Rx
swgDeviceSettings->setOriginatorIndex(m_deviceAPI->getDeviceSetIndex());
swgDeviceSettings->setDeviceHwType(new QString("TestSource"));
QString channelSettingsURL = QString("http://%1:%2/sdrangel/deviceset/%3/device/run")
.arg(m_settings.m_reverseAPIAddress)
.arg(m_settings.m_reverseAPIPort)
.arg(m_settings.m_reverseAPIDeviceIndex);
m_networkRequest.setUrl(QUrl(channelSettingsURL));
m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
QBuffer *buffer=new QBuffer();
buffer->open((QBuffer::ReadWrite));
buffer->write(swgDeviceSettings->asJson().toUtf8());
buffer->seek(0);
if (start) {
m_networkManager->sendCustomRequest(m_networkRequest, "POST", buffer);
} else {
m_networkManager->sendCustomRequest(m_networkRequest, "DELETE", buffer);
}
}
void TestMI::networkManagerFinished(QNetworkReply *reply)
{
QNetworkReply::NetworkError replyError = reply->error();
if (replyError)
{
qWarning() << "TestMI::networkManagerFinished:"
<< " error(" << (int) replyError
<< "): " << replyError
<< ": " << reply->errorString();
return;
}
QString answer = reply->readAll();
answer.chop(1); // remove last \n
qDebug("TestMI::networkManagerFinished: reply:\n%s", answer.toStdString().c_str());
}