golang如何使用gos7读取S7200Smart数据

// package utility
// @author 铁憨憨[cory] 2024/11/28 17:17:00
package utility
import (
	"encoding/binary"
	"fmt"
	"github.com/robinson/gos7"
	"math"
	"time"
)
// @title pclmain
// @description 连接到plc并读取不同类型的数据
// @author 铁憨憨[cory] 2024-11-29 11:16:41
func pclmain() {
	// 设置和连接plc
	const (
		tcpdevice = "127.0.0.1" //ip地址
		rack      = 0           //机架号
		slot      = 1           //插槽号
	)
	handler := gos7.newtcpclienthandler(tcpdevice, rack, slot)
	handler.timeout = 200 * time.second
	handler.idletimeout = 200 * time.second
	//handler.logger = log.new(os.stdout, "tcp: ", log.lstdflags)
	err := handler.connect()
	if err != nil {
		fmt.println("连接plc失败:", err)
		return
	}
	defer func(handler *gos7.tcpclienthandler) {
		err := handler.close()
		if err != nil {
			fmt.println("关闭plc失败:", err)
		}
	}(handler)
	// 创建客户端
	client := gos7.newclient(handler)
	// 定义测试数据
	testcases := []struct {
		param1, param2, param3 int
		datatype               string
	}{
		{200, 10, 10, "str"},
		{200, 30, 10, "str"},
		{200, 1, 1, "bool"},
		{200, 4, 2, "short"},
		{200, 60, 4, "float"},
		{1, 1, 0, "bool"},
		{709, 0, 0, "bool"},
		{709, 0, 1, "bool"},
		{818, 2210, 1, "byte"},
		{292, 200, 2, "short"},
		{292, 202, 2, "short"},
		{818, 204, 2, "short"},
		{818, 236, 28, "str"},
	}
	for {
		for _, testcase := range testcases {
			data, dataerr := readdata(client, testcase.param1, testcase.param2, testcase.param3, testcase.datatype)
			if dataerr == nil {
				fmt.print(data, "  ")
			}
		}
		fmt.println("  ")
		fmt.println("  ")
		fmt.println("  ")
		// 休眠1秒
		time.sleep(1 * time.second)
	}
}
// @title readdata
// @description  根据数据类型从plc读取数据
// @author 铁憨憨[cory] 2024-11-29 11:15:39
// @param client plc客户端
// @param address 数据地址
// @param start 数据起始位置
// @param size 数据大小
// @param datatype 数据类型
// @return result 读取的数据
// @return err 可能的错误
func readdata(client gos7.client, address, start, size int, datatype string) (result interface{}, err error) {
	switch datatype {
	case "str":
		buf := make([]byte, size)
		err = client.agreaddb(address, start, size, buf)
		if err == nil {
			result = string(buf)
		}
	case "bool":
		buffer := make([]byte, 1)
		err = client.agreaddb(address, start, size, buffer)
		if err == nil {
			boolvalue := (buffer[0] & (1 << 0)) != 0 // 第 0 位
			result = boolvalue
		}
	case "short":
		buffer := make([]byte, size)
		err = client.agreaddb(address, start, size, buffer)
		if err == nil {
			// 将字节数据转换为 short（有符号 16 位整数）
			shortvalue := int16(binary.bigendian.uint16(buffer))
			result = shortvalue
		}
	case "float":
		buffer := make([]byte, size)
		err = client.agreaddb(address, start, size, buffer)
		if err == nil {
			floatvalue := math.float32frombits(binary.bigendian.uint32(buffer))
			result = floatvalue
		}
	case "byte":
		buf := make([]byte, size)
		err = client.agreaddb(address, start, size, buf)
		if err == nil {
			result = buf[0]
		}
	default:
		fmt.printf("不支持的数据类型: %s\n", datatype)
		return
	}
	return
}