qt 西门子1200读写

以下是使用Qt5开发的西门子S7-1200读写程序的示例代码：

#include <QCoreApplication>
#include <QThread>
#include <QDebug>
#include "snap7/snap7.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // 初始化Snap7库
    int result = Cli_Init();
    if (result != 0) {
        qDebug() << "Snap7 library initialization failed!";
        return -1;
    }

    // 创建PLC连接
    TS7Client *client = Cli_Create();
    if (client == nullptr) {
        qDebug() << "Failed to create PLC connection!";
        return -1;
    }

    // 设置PLC连接参数
    Cli_SetConnectionParams(client, "192.168.0.1", 0x02, 0x01);

    // 连接PLC
    result = Cli_Connect(client);
    if (result != 0) {
        qDebug() << "Failed to connect to PLC!";
        Cli_Destroy(&client);
        return -1;
    }

    // 读取DB块数据
    uint8_t buffer[1024];
    result = Cli_DBRead(client, 1, 0, sizeof(buffer), buffer);
    if (result != 0) {
        qDebug() << "Failed to read DB data!";
        Cli_Disconnect(client);
        Cli_Destroy(&client);
        return -1;
    }

    // 写入DB块数据
    result = Cli_DBWrite(client, 1, 0, sizeof(buffer), buffer);
    if (result != 0) {
        qDebug() << "Failed to write DB data!";
        Cli_Disconnect(client);
        Cli_Destroy(&client);
        return -1;
    }

    // 断开PLC连接
    Cli_Disconnect(client);

    // 销毁PLC连接
    Cli_Destroy(&client);

    // 退出程序
    return a.exec();
}

该示例代码使用Snap7库实现了对S7-1200 PLC的读写操作。其中，Cli_Init()函数用于初始化Snap7库，Cli_Create()函数用于创建PLC连接，Cli_SetConnectionParams()函数用于设置PLC连接参数，Cli_Connect()函数用于连接PLC，Cli_DBRead()函数用于读取DB块数据，Cli_DBWrite()函数用于写入DB块数据，Cli_Disconnect()函数用于断开PLC连接，Cli_Destroy()函数用于销毁PLC连接。