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| void MainWindow::onReadButtonClicked() {
if (!modbusDevice)
return;
ui->readValue->clear();
statusBar()->clearMessage();
if (auto *reply = modbusDevice->sendReadRequest(readRequest(), ui->serverEdit->value())) {
if (!reply->isFinished())
connect(reply, &QModbusReply::finished, this, &MainWindow::onReadReady);
else
delete reply;
} else {
statusBar()->showMessage(tr("Read error: ") + modbusDevice->errorString(), 5000);
}
}
void MainWindow::onReadReady() {
auto reply = qobject_cast<QModbusReply *>(sender());
if (!reply)
return;
if (reply->error() == QModbusDevice::NoError) {
const QModbusDataUnit unit = reply->result();
for (int i = 0, total = int(unit.valueCount()); i < total; ++i) {
const QString entry = tr("Address: %1, Value: %2").arg(unit.startAddress() + i)
.arg(QString::number(unit.value(i),
unit.registerType() <= QModbusDataUnit::Coils ? 10 : 16));
ui->readValue->addItem(entry);
}
} else if (reply->error() == QModbusDevice::ProtocolError) {
statusBar()->showMessage(tr("Read response error: %1 (Mobus exception: 0x%2)").
arg(reply->errorString()).
arg(reply->rawResult().exceptionCode(), -1, 16), 5000);
} else {
statusBar()->showMessage(tr("Read response error: %1 (code: 0x%2)").
arg(reply->errorString()).
arg(reply->error(), -1, 16), 5000);
}
QModbusDataUnit MainWindow::readRequest() const {
const auto table =
static_cast<QModbusDataUnit::RegisterType>(ui->writeTable->currentData().toInt());
int startAddress = ui->readAddress->value();
Q_ASSERT(startAddress >= 0 && startAddress < 10);
quint16 numberOfEntries = qMin(ui->readSize->currentText().toUShort(), quint16(10 - startAddress));
return QModbusDataUnit(table, startAddress, numberOfEntries);
} |
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