春哥的毕业设计之共享内存2

春哥的嵌入式小世界 2022-06-18

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大家好，我是春哥。我又回来了，前些天我懒了，在耍，今天来更新一下我毕业设计的内容。今天这个更新之后就可以完完全全实现整个流程了，可以看到演示效果了。

内容全在B站视频里。视频地址贴下面，有需要的小伙伴自行获取。https://www.bilibili.com/video/BV1tt4y1h7YB?spm_id_from=333.999.0.0&vd_source=7cc77a87bc55ee33aba6ea24258d27aa

源代码如下：

sim_catch.c

#include <string.h>
#include <time.h>
#include "task.h"


static struct tasks_info *tasks;
static char* task_labels[] = {"仓库1","仓库2","仓库3","仓库4","仓库5"};


void get_data(int num){
    tasks->num=num;
    for (int i = 0; i < num; ++i) {
        tasks->data[i].temp=((rand()/9000)+1000)/100.0;
        snprintf(tasks->data[i].label,"%s",task_labels[i]);
        tasks->data[i].humi=(rand()/9000)/100.0;
    }
}




int main(){
    srand(time(NULL));
    tasks = (struct tasks_info*)init_shm();
    while (1) {
       get_data(3);
       sleep(1);
    }
    return 0;
}


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task.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include "task.h"


void *init_shm(){
    key_t k1;
    int shm_id;
    void *res;
    struct tasks_info *t1;


    k1=ftok("/root",10);
    if(k1==-1){
        return;
    }


    shm_id=shmget(k1,sizeof(struct tasks_info),IPC_CREAT | 0644);
    if(shm_id == -1){
        return;
    }


    res = (struct tasks_info*)shmat(shm_id, NULL, 0);


    return res;


}
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task.h

#ifndef WEB_TEST_TASK_H
#define WEB_TEST_TASK_H


#define MAX_TASK 5
#define KEY_1 "/root"
#define KEY_2 10


struct task_msg{
    double temp;
    double humi;
    char label[32];
};


struct tasks_info{
    int num;
    struct task_msg data[MAX_TASK];
};


//初始化共享内存空间，返回对应进程空间映射地址
extern void *init_shm();
extern detach_shm(void *p);


#endif //WEB_TEST_TASK_H


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temp_cgi.c

//
// Created by Alex Yan on 2022/1/19.
//
#include <string.h>
#include <time.h>
#include "task.h"
#include "cJSON.h"


static struct tasks_info *tasks;


void send_json(){
    cJSON *infos;
    cJSON *info;
    char *temp[16];
    char *humi[16];
    char *str;
    cJSON *root = cJSON_CreateObject();
    if(root == NULL){
        goto end;
    }
    int num=tasks->num;
    cJSON_AddItemToObject(root,"num",cJSON_CreateNumber(num+1));
    infos = cJSON_CreateArray();
    cJSON_AddItemToObject(root,"data",infos);
    for (int i = 0; i < num; ++i) {
        info = cJSON_CreateObject();
        if(info == NULL){
            goto end;
        }
        cJSON_AddItemToArray(infos,info);
        cJSON_AddItemToObject(info,"label",cJSON_CreateString(tasks->data[i].label));
        snprintf(temp,sizeof(temp),"%.1f",tasks->data[i].temp);
        cJSON_AddItemToObject(info,"temp",cJSON_CreateString(temp));
        snprintf(humi,sizeof(humi),"%.1f",tasks->data[i].humi);
        cJSON_AddItemToObject(info,"humi",cJSON_CreateString(humi));
    }


    str = cJSON_Print(root);
    printf("%s",str);
    free(str);
end:
    cJSON_Delete(root);
    return;
}


int main(){
    printf("Content-Type:text/html;charset=utf-8\r\n");
    printf("\r\n");
    tasks = (struct tasks_info*)init_shm();
    if(tasks == NULL){
        return -1;
    }
    send_json();
    return 0;
}
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makefile

TARGET1 := sim_catch
TARGET2 := temp_cgi


CROSS_COMPILE :=
CC = $(CROSS_COMPILE)gcc
LD = $(CROSS_COMPILE)ld


OBJS1 := sim_catch.o task.o
OBJS2 := temp_cgi.o task.o cJSON.o


CFLAGS += -Wall -I./inc


LDFLAGS +=


OUTPUT_DIR = home/alex/Graduation_Project/cgi/


all:$(TARGET1) $(TARGET2)
$(TARGET1):$(OBJS1)
  $(CC) $(LDFLAGS) -o $@ $^
  cp $@ $(OUTPUT_DIR)


$(TARGET2):$(OBJS2)
  $(CC) $(LDFLAGS) -o $@ $^
  cp $@ $(OUTPUT_DIR)


%.o : %.c
  $(CC) $(CFLAGS) -c -o $@ $^


clean:
  rm -f $(TARGET1) $(OBJS1) $(TARGET2) $(OBJS2)
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春哥的毕业设计之共享内存2

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