#物联网征文#【FFH】基于 OpenHarmony 的水流量监测系统（二） 原创 精华

int sockfd = socket(AF_INET, SOCK_DGRAM, 0); 
struct sockaddr_in sock_addr = {0}; 
sock_addr.sin_family = AF_INET; 
sock_addr.sin_port = htons(4000); 
sock_addr.sin_addr.s_addr = inet_addr("114.116.10.71"); 
char sendbuf[1024]={0};
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sprintf(sendbuf,"%d",data)
sendto(sockfd, sendbuf, sizeof(sendbuf), 0, 
(struct sockaddr*)&sock_addr,sizeof(sock_addr)); 
sleep(1);
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#include <fcntl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdio.h>
#include "hdf_sbuf.h"
#include "hdf_io_service_if.h"
//导入相应的头文件
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <unistd.h>

#define LED_WRITE_READ 1
#define LED_SERVICE "hdf_led"

static int SendEvent(struct HdfIoService *serv, uint8_t eventData)
{
    int ret = 0;
    struct HdfSBuf *data = HdfSBufObtainDefaultSize();
    if (data == NULL)
    {
        printf("fail to obtain sbuf data!\r\n");
        return 1;
    }

    struct HdfSBuf *reply = HdfSBufObtainDefaultSize();
    if (reply == NULL)
    {
        printf("fail to obtain sbuf reply!\r\n");
        ret = HDF_DEV_ERR_NO_MEMORY;
        goto out;
    }
    /* 写入数据 */
    if (!HdfSbufWriteUint8(data, eventData))
    {
        printf("fail to write sbuf!\r\n");
        ret = HDF_FAILURE;
        goto out;
    }
    /* 通过Dispatch发送到驱动 */
    ret = serv->dispatcher->Dispatch(&serv->object, LED_WRITE_READ, data, reply);
    if (ret != HDF_SUCCESS)
    {
        printf("fail to send service call!\r\n");
        goto out;
    }

    int replyData = 0;
    /* 读取驱动的回复数据 */
    if (!HdfSbufReadInt32(reply, &replyData))
    {
        printf("fail to get service call reply!\r\n");
        ret = HDF_ERR_INVALID_OBJECT;
        goto out;
    }
    printf("\r\nGet reply is: %d\r\n", replyData);
    sprintf(sendbuf,"%d",replyData);
    sendto(sockfd, sendbuf, sizeof(sendbuf), 0, (struct sockaddr*)&sock_addr, sizeof(sock_addr));
out:
    HdfSBufRecycle(data);
    HdfSBufRecycle(reply);
    return ret;
}

int main(int argc, char **argv)
{
    int i;
    //1.创建socket
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    //2.配置端口和地址
    struct sockaddr_in sock_addr = {0};
    sock_addr.sin_family = AF_INET;          // 设置地址族为IPv4
    sock_addr.sin_port = htons(4000);        // 设置地址的端口号信息
    sock_addr.sin_addr.s_addr = inet_addr("114.116.10.71");   //　设置IP地址
    //3.创建发送缓冲器字符串数组
    char sendbuf[1024]={0};  //发送数据
    /* 获取服务 */
    struct HdfIoService *serv = HdfIoServiceBind(LED_SERVICE);
    if (serv == NULL)
    {
        printf("fail to get service %s!\r\n", LED_SERVICE);
        return HDF_FAILURE;
    }

    for (i=0; i < argc; i++)
    {
        printf("\r\nArgument %d is %s.\r\n", i, argv[i]);
    }
    while(1){
        SendEvent(serv, atoi(argv[1]));
    	sprintf(sendbuf,"%d",replyData); //发送数据
     	sendto(sockfd, sendbuf, sizeof(sendbuf), 0, (struct sockaddr*)&sock_addr, sizeof(sock_addr));
        sleep(1);
    }
    // 4. 关闭套接字
    close(sockfd);
    HdfIoServiceRecycle(serv);
    printf("exit");

    return HDF_SUCCESS;
}
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import socket, time


def main():
    # 1、创建一个UDP套接字
    udp_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

    # 2. 绑定本地的相关信息，如果不绑定，则系统会随机分配一个端口号
    local_addr = ('', 50001)  # ip地址和端口号，ip一般不用写，表示本机的任何一个ip
    udp_socket.bind(local_addr)
    while 1:
        # 3. 等待接收对方发送的数据
        data, addr = udp_socket.recvfrom(1024)  # 1024表示本次接收的最大字节数
        # 4、打印接收到的数据
        #print(data)
        print(data.decode('utf-8'))
        # 5. 关闭套接字
    udp_socket.close()

if __name__ == '__main__':
    main()
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global values 
while True: 
data, addr = udp_socket.recvfrom(1024)
print(data.decode('utf-8'))
values=int(data.decode('utf-8')) 
udp_socket.close()
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global values
while True: 
	ios_connection, ios_address = ios.accept()
	data = ios_connection.recv(1024).decode('UTF-8') 
	print(data)
	print(ios_address) 
	ios_connection.send(b"HTTP/1.1 200 OK\r\nContentType:text/html;charset=utf-8\r\n\r\n")
	ios_connection.send(str(values).encode('utf-8'))
	datalist = data.split("\n") 
	for i in datalist:
	if i == "key: open\r": 
		pass 
	elif i == "key: close\r": 
		pass 
	else: 
		pass 
ios_connection.close()
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//自定义接口 static water_rate(options: { 
	code: number; 
	success?: (res: string) => void; 
	fail?: (res: string, code: number) => void; 
	complete?: () => void; }): void; 
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change_per_second(e){
        const ShowRate = ()=>
        {
            let that=this
            app.ledcontrol({
                code:1,
                success(res){console.log("data show1")
                    that.rate = res.led_status
                    test_value = JSON.stringify(res.led_status)
                },
                fail(res,code){

                },
                complete(){

                }
            })
            console.log("data show2")
//            console.log("data show1")
//            this.rate=app.water_rate.code;
//            console.log("data show2")
        }
        const a= setInterval(function(){ShowRate()},1000);
        /*这里有一个关于类里This的指向问题，这里使用匿名函数处理 ()=>{}
        不可以使用function()，因为由于类特性，在function里的this指向change_per_second的rate变量，而无法访问到default类的rate变量
        但是匿名函数里this会逐层上找
        */
    },
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test_value = JSON.stringify(res.led_status)
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