#include <stdio.h>
#include <stdlib.h>
#include <cstring>
#include "lib/snap7.h"

TS7Server *Server;
unsigned char DB1[512];  // Our DB1
unsigned char DB2[128];  // Our DB2
unsigned char DB3[1024]; // Our DB3
unsigned char MB[2048];  // 2048 = CPU 315 Merkers amount

int main(int argc, char* argv[])
{
    int Error;
    Server = new TS7Server;
    Server->RegisterArea(srvAreaDB,     // We are registering a DB
                         1,             // Its number is 1 (DB1)
                         &DB1,          // Its address
                         sizeof(DB1));  // Its size
    Server->RegisterArea(srvAreaDB, 2, &DB2, sizeof(DB2));
    Server->RegisterArea(srvAreaDB, 3, &DB3, sizeof(DB3));
    // Let’s share all Merkers from M0.0 to M2047.7
    Server->RegisterArea(srvAreaMK, 0, &MB, sizeof(MB));
    // Start the server onto the default adapter “0.0.0.0”
    Error=Server->Start();
    if (Error==0)
    {
       // Now the server is running ... wait a key to terminate
        getchar();
    }
    else
        printf("%s\n",SrvErrorText(Error).c_str());
    Server->Stop(); // not strictly needed
    delete Server;
}

#include <iostream>  
#include "lib/snap7.h"

// 连接参数
const char* plc_address = "127.0.0.1";
const int rack = 0; 
const int slot = 0;
// 数据位置
static int db_number = 1; 
const int data_offset = 66;
// 数据存储变量
static bool mydata = false; 

int main(){
    TS7Client* MyClient = new TS7Client();
    MyClient->ConnectTo(plc_address, rack, slot);
    if (!MyClient->Connected() && MyClient->Connect()>0) {
        return -1;
    }

    bool newVal = true;
    MyClient->DBWrite(db_number, data_offset, 1, &newVal);

    MyClient->DBRead(db_number, data_offset, 1, &mydata);
    std::cout << "mydata:" << mydata << std::endl; 
    //输出：mydata:1

    delete MyClient;
}