写一份用QT实现批量读取opc服务端数据的代码
时间: 2024-05-13 19:20:18 浏览: 193
好的,以下是用QT实现批量读取opc服务端数据的示例代码:
```C++
#include <iostream>
#include <Windows.h>
#include <QApplication>
#include <QAxObject>
#include <QVariant>
#include <QTableWidget>
#include <QTime>
#define OPC_SERVER_NAME "Matrikon.OPC.Simulation"
#define OPC_GROUP_NAME "TestGroup"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QAxObject* server = new QAxObject(QLatin1String("Matrikon.OPC.Simulation.1"));
if (!server) {
std::cerr << "Failed to create OPC server object." << std::endl;
return -1;
}
if (!server->setProperty("Connected", true)) {
std::cerr << "Failed to connect to OPC server." << std::endl;
return -1;
}
QAxObject* group = server->querySubObject(QLatin1String("OPCGroups"))->call(QLatin1String("Add"), OPC_GROUP_NAME).value<QAxObject*>();
if (!group) {
std::cerr << "Failed to create OPC group object." << std::endl;
return -1;
}
group->setProperty("Active", true);
group->setProperty("DeadBand", 0);
group->setProperty("UpdateRate", 100);
group->setProperty("IsActive", true);
group->setProperty("IsSubscribed", true);
QAxObject* items = group->querySubObject(QLatin1String("OPCItems"));
if (!items) {
std::cerr << "Failed to create OPC items object." << std::endl;
return -1;
}
// Add items to OPC group
for (int i = 0; i < 10; i++) {
QString item = QString("%1.Ch%2").arg(OPC_SERVER_NAME).arg(i + 1);
items->call(QLatin1String("Add"), item, i);
}
QTableWidget* table = new QTableWidget(10, 2);
table->setWindowTitle(QLatin1String("OPC Item Values"));
table->setHorizontalHeaderLabels(QStringList() << "Item" << "Value");
// Read OPC item values
while (true) {
QTime time = QTime::currentTime();
for (int i = 0; i < 10; i++) {
QVariant value = items->querySubObject(QLatin1String("Item"), i)->dynamicCall(QLatin1String("Value"));
QTableWidgetItem* item = new QTableWidgetItem(QString("%1.Ch%2").arg(OPC_SERVER_NAME).arg(i + 1));
table->setItem(i, 0, item);
QTableWidgetItem* valueItem = new QTableWidgetItem(value.toString());
table->setItem(i, 1, valueItem);
}
table->show();
a.processEvents();
int elapsed = time.elapsed();
Sleep(1000 - elapsed);
}
return a.exec();
}
```
这个代码演示了如何用QT实现批量读取OPC服务端数据。首先用`QAxObject`创建一个OPC服务器对象,并连接到OPC服务端。然后创建一个OPC分组对象,并添加需要读取的OPC Item。最后,通过循环读取OPC Item的值,并将值显示在QT的表格中。
值得注意的是,OPC Item名称格式为`ServerName.ChannelName`,其中`ServerName`是OPC服务器名称,`ChannelName`是OPC通道名称。在这个示例代码中,`ServerName`为`Matrikon.OPC.Simulation`,`ChannelName`为`Ch1`到`Ch10`。如果要读取其它OPC服务器和通道的数据,需要修改`item`字符串的内容。
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