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This article mainly introduces "how to achieve data monitoring in Qt". In daily operation, I believe many people have doubts about how to achieve data monitoring in Qt. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to achieve data monitoring in Qt". Next, please follow the editor to study!

I. Preface

There are four view modes for the monitoring of equipment in this project, which can be switched arbitrarily, including data monitoring, map monitoring, equipment monitoring and curve monitoring, of which data monitoring is the most commonly used, so it is also ranked first in the main interface navigation. comprehensive observation and analysis of a lot of gas safety or configuration monitoring software, most users are accustomed to having a table to display the real-time data and status of the corresponding equipment row by row. Add some special color signs to make it more intuitive, and sometimes it will be displayed by category.

Qt provides a table control QTableWidget, which can directly display data in the form of rows and rows. It is also very friendly to use interfaces and methods, directly new a QTableWidgetItem and then specify the row and column location setItem. Generally, during system initialization, item is instantiated by reading the list of devices in the database and then loaded. The difficulty lies in how to update these data dynamically and display them in different colors according to the values received. For this reason, a special method setColor is written to filter the incoming data, such as the alarm value is shown in red and bold, and these colors are customized. You can set various colors in the system settings, such as underreporting, overreporting, offline, normal and so on.

In the class of protocol parsing, the data is not immediately sent to the data table. The refresh frequency is too high, which is meaningless and unnecessary, because the data in most of the time is actually the same. So in the class of protocol parsing, there is a queue that specifically stores the corresponding value of each device. Only when the value changes, it needs to be re-sent to the interface for display. The same is true for equipment online and offline, and the status needs to be updated only when the device is online or offline for the first time.

II. Functional features

Collect data port, support serial port + network port, serial port support free setting of serial number + baud rate, network support free setting of IP address + communication port, each port supports collection cycle, default one address per second, support setting communication timeout times, default 3 times, support maximum reconnection time, used to re-read offline devices.

Controller information, you can add the controller name, select the controller address + controller model, and set the number of detectors under the controller.

Detector information, can add tag, free to choose detector type, gas type, gas symbol, high reported value, low reported value, buffer value, clear zero value, whether enabled, alarm sound, background map, storage cycle, numerical conversion decimal places, alarm delay time, alarm type (HH,LL,HL) and so on.

Controller model + detector type + gas type + gas symbol, all can be configured freely.

Maps can be imported and deleted, and all detectors can be dragged and saved freely.

Port information + controller information + detector information, support import and export + export to excel+ printing.

Run record + alarm record + user record, support multi-condition combination query, such as time period + controller + detector, etc., all records can be exported to excel+ printing.

Records exported to excel support all versions of table files such as excel+wps and do not rely on software such as excel.

You can delete data within a specified time range, support automatic cleaning of early data, and set the maximum number of saved records.

Support alarm short message forwarding, support multiple receiving mobile phone numbers, you can set the sending interval, such as instant sending or sending all alarm messages once every 6 hours, the text message content is too long, automatically split multiple text messages.

Support alarm email forwarding, support multiple receiving mailboxes, can set sending interval, such as immediate sending or sending all alarm messages once every 6 hours, support attachment sending.

Overreport color + underreport color + normal color + 0 value color + curve background + curve color, etc., are free to choose.

The Chinese title + English title + logo path + copyright of the software can be set freely.

Provide switch settings for boot operation + alarm sound + automatic login + remember password and so on.

Alarm sound can be set to play the number of times, the interface provides 17 kinds of skin file selection.

Cloud data synchronization is supported, and the information of cloud database can be set, such as database name, user name + password, etc.

Support network forwarding and network reception, after the network reception is turned on, the software receives data from udp for analysis. Network forwarding supports multiple target IP, so it realizes the software of local collection, and freely transfers the data to the client to view the detector data at any time.

Automatically remember the user's last stay in the interface + other information, restart and apply automatically.

The alarm automatically switches to the corresponding map, and the detector button flashes.

Double-click the detector icon to control it back.

Support user rights management, administrator + operator two categories, user login + user exit, can remember the password and automatic login, more than three error messages and close the program.

Support four monitoring modes, equipment panel monitoring + map monitoring + table data monitoring + curve data monitoring, free to switch, four synchronous applications.

Support alarm relay linkage, a tag can link multiple modules and relay numbers across serial ports, and support many-to-many.

The local data store supports sqlite+mysql and remote data synchronization to the cloud database. Automatically reconnect.

The data collected by the local device is uploaded to the cloud in real time so that it can be extracted by other methods such as APP or web.

Two kinds of data sources are supported, one is serial port and network to collect equipment data through protocol, the other is database collection. The database acquisition mode can be used as a general system.

Comes with a device simulation tool that supports 16 device data simulations, as well as database data simulations to test data when there is no device.

The default communication protocol uses modbus protocol, and later increases the support of mqtt and other Internet of things protocols to make a general system.

Supports all windows operating systems + linux operating systems and other operating systems.

Third, effect picture

4. The core code void DeviceHelper::deviceValue (const QString & positionID, float value) {/ / below will not be executed frequently and will only be executed when the data has changed. Filtering / / processing device panel if (App::PanelMode = = 0) {foreach (frmDeviceNode * device, devices) {if (device- > getPositionID () = = positionID) {device- > setValue (value) has been done in the parsed place. Break;}} else if (App::PanelMode = = 1) {foreach (frmDeviceNode2 * device, devices2) {if (device- > getPositionID () = = positionID) {device- > setValue (value); break;}} / / processing device button bool alarm = false Foreach (ButtonDefence * btn, btns) {if (btn- > property ("positionID"). ToString () = = positionID) {alarm = (btn- > getButtonStatus () = = ButtonDefence::ButtonStatus_Alarm); btn- > setProperty ("value", value) / / two sensors are displayed with normal and abnormal values of 1 and 2 instead of QString nodeType = btn- > property ("nodeType"). ToString (); if (nodeType = = "SJ-0001" | | nodeType = = "JG-0001") {btn- > setText (value = = 1? "normal": "abnormal");} else {btn- > setText (QString ("% 1% 2") .arg (value) .arg (btn- > property ("nodeSign"). ToString ());} break;}} / / processing equipment form int count = deviceData- > rowCount (); for (int I = 0; I

Item (I, 1)-> text (); if (id = = positionID) {deviceData- > item (I, 7)-> setText (QString::number (value)); break;}} void DeviceHelper::deviceAlarm (const QString & positionID, quint8 alarmType) {/ / 0-concentration upper limit alarm 2-concentration lower limit alarm 5-other alarm bool alarm = (alarmType = 0 | alarmType = 2 | | alarmType = 5) / / processing device panel if (App::PanelMode = = 0) {foreach (frmDeviceNode * device, devices) {if (device- > getPositionID () = = positionID) {device- > setAlarm (alarm); break } else if (App::PanelMode = = 1) {foreach (frmDeviceNode2 * device, devices2) {if (device- > getPositionID () = = positionID) {device- > setAlarm (alarm); break Processing device button foreach (ButtonDefence * btn, btns) {if (btn- > property ("positionID"). ToString () = = positionID) {btn- > setButtonStatus (alarm? ButtonDefence::ButtonStatus_Alarm: ButtonDefence::ButtonStatus_Arming); / / switch to the current map initDeviceMapCurrent (btn- > property ("nodeImage"). ToString (); break;}} / / processing equipment form int count = deviceData- > rowCount (); for (int I = 0; I

Item (I, 1)-> text (); if (id = = positionID) {setColor (deviceData- > item (I, 7), deviceData- > item (I, 9), alarmType); break;}} / / Cloud data synchronization if (App::UseNetDB) {int nodeStatus = 1; if (alarmType = = 0) {nodeStatus = 3 } else if (alarmType = = 2) {nodeStatus = 2;} else if (alarmType = = 5) {nodeStatus = 5;} QString sql = QString ("update NodeData set NodeStatus='%1' where PositionID='%2'") .arg (nodeStatus) .arg (positionID); DbTcpClientThread::Instance ()-> append (sql) }} void DeviceHelper::setColor (QTableWidgetItem * itemValue, QTableWidgetItem * itemStatus, quint8 alarmType) {/ / 0-low reporting 1-low reporting recovery 2-High reporting 3-High reporting recovery 5-other alarms 6-other alarm recovery if (alarmType = = 0) {itemValue- > setForeground (QColor (App::ColorLimit)); itemStatus- > setForeground (QColor (App::ColorLimit)); itemStatus- > setText ("underreporting") } else if (alarmType = = 2) {itemValue- > setForeground (QColor (App::ColorUpper)); itemStatus- > setForeground (QColor (App::ColorUpper)); itemStatus- > setText ("high report");} else if (alarmType = = 1 | alarmType = = 3 | | alarmType = = 6) {itemValue- > setForeground (QColor (App::ColorNormal)); itemStatus- > setForeground (QColor (App::ColorNormal)); itemStatus- > setText ("normal") } else if (alarmType = = 4) {itemValue- > setForeground (QColor (App::ColorZero)); itemStatus- > setForeground (QColor (App::ColorZero)); itemStatus- > setText ("offline"); itemValue- > setText ("0");} else if (alarmType = = 5) {itemValue- > setForeground (QColor (App::ColorOther); itemStatus- > setForeground (QColor (App::ColorOther) ItemStatus- > setText ("invalidation");}} void DeviceHelper::setColor (QTableWidgetItem * itemValue, QTableWidgetItem * itemStatus, float value, float max, float min, const QString & alarmType) {/ / there is an unprocessed one here. Whether the initial value needs to be judged and alerted if (value = = 0) {itemValue- > setForeground (QColor (App::ColorZero)) ItemStatus- > setForeground (QColor (App::ColorZero));} else if (value > max) {itemValue- > setForeground (QColor (App::ColorUpper)); itemStatus- > setForeground (QColor (App::ColorUpper));} else if (value)

SetForeground (QColor (App::ColorLimit)); itemStatus- > setForeground (QColor (App::ColorLimit));} else {itemValue- > setForeground (QColor (App::ColorNormal)); itemStatus- > setForeground (QColor (App::ColorNormal));} itemValue- > setText (QString::number (value));} at this point, the study on "how Qt implements data monitoring" is over, hoping to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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