RTT studio webclient+Cjson 上传json数据包

发布于 2021-12-10 18:59:45 浏览：1187 订阅该版

```c
#define POST_RESP_BUFSZ                1024
#define POST_HEADER_BUFSZ              1024

#define POST_LOCAL_URI                 "www.baidu.com"
static int webclient_post_comm(const char *uri, const char *post_data)
{
    struct webclient_session* session = RT_NULL;
    unsigned char *buffer = RT_NULL;
    int index, ret = 0;
    int bytes_read, resp_status;

buffer = (unsigned char *) web_malloc(POST_RESP_BUFSZ);
    if (buffer == RT_NULL)
    {
        rt_kprintf("no memory for receive response buffer.\n");
        ret = -RT_ENOMEM;
        goto __exit;
    }

/* create webclient session and set header response size */
    session = webclient_session_create(POST_HEADER_BUFSZ);
    if (session == RT_NULL)
    {
        ret = -RT_ENOMEM;
        goto __exit;
    }

/* build header for upload */
   webclient_header_fields_add(session, "Content-Length: %d\r\n", strlen(post_data));
   webclient_header_fields_add(session, "Content-Type: application/json\r\n");

/* send POST request by default header */
    if ((resp_status = webclient_post(session, uri, post_data)) != 200)
    {
        rt_kprintf("webclient POST request failed, response(%d) error.\n", resp_status);
        ret = -RT_ERROR;
        goto __exit;
    }

rt_kprintf("webclient post response data: \n");
    do
    {
        bytes_read = webclient_read(session, buffer, POST_RESP_BUFSZ);
        if (bytes_read <= 0)
        {
            break;
        }

for (index = 0; index < bytes_read; index++)
        {
            rt_kprintf("%c", buffer[index]);
        }
    } while (1);

rt_kprintf("\n");

__exit:
    if (session)
    {
        webclient_close(session);
    }

if (buffer)
    {
        web_free(buffer);
    }

return ret;
}

void httponline_test(void){
    cJSON *cdata = cJSON_CreateObject();
    cJSON *ccar= cJSON_CreateString("False");
    cJSON *ccheckStatus = cJSON_CreateString("1");

cJSON_AddItemToObject(cdata, "car", ccar);
    cJSON_AddItemToObject(cdata, "checkStatus", ccheckStatus);

cJSON *cupload = cJSON_CreateObject();
    cJSON_AddItemToObject(cupload, "data", cdata);
    cJSON *ctype = cJSON_CreateNumber(0);
    cJSON_AddItemToObject(cupload, "type", ctype);
    LOG_D(cJSON_Print(cupload));

char *post_data=cJSON_Print(cupload);

char *uri = RT_NULL;
    uri = web_strdup(POST_LOCAL_URI);
    if(uri == RT_NULL)
    {
        rt_kprintf("no memory for create post request uri buffer.\n");
        //return -RT_ENOMEM;
    }
    for(int i=0;i<10;i++){
        rt_thread_mdelay(1000);
        webclient_post_comm(uri,post_data);
    }

}

MSH_CMD_EXPORT(httponline_test, httponline_test);
```
POST_LOCAL_URI填自己需要上传数据的地址

webclient配置:
![image.png](https://oss-club.rt-thread.org/uploads/20211210/a951241aaf66e9dfa0d22d778c8260b4.png)
其他配置:
![image.png](https://oss-club.rt-thread.org/uploads/20211210/bdfb4bbe94e40432116aac9e408dad1e.png.webp)

可能遇到问题解决方法:https://club.rt-thread.org/ask/question/424806.html
如果碰到其他的问题可以在我的提问中找找💬