关于，比特币BTC表盘，功能更新，提供API，有劳大佬帮帮忙

-cqw

https://www.gatecn.io/api2


补充内容 (2020-9-9 14:29):
https://data.gateio.la/api2/1/ticker/btc_usdc
返回：{"result":"true","last":"10069.05","lowestAsk":"10094.65",............其中last为市场价，就是要显示的数值

-cqw

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "maibu_sdk.h"
#include "maibu_res.h"


/*Web通讯ID*/
static uint32_t g_comm_id_web = 0;

/*Web request地址*/
#define DATA_WEB     "https://data.gateio.la/api2/1/ticker/btc_usdc"

/* 时间项 */
#define DATE_TEXT_POS_X                      2
#define DATE_TEXT_POS_Y                      6
#define DATE_TEXT_SIZE_W                     70
#define DATE_TEXT_SIZE_H                     14

#define TIME_TEXT_POS_X                      90
#define TIME_TEXT_POS_Y                      6
#define TIME_TEXT_SIZE_W                     36
#define TIME_TEXT_SIZE_H                     14

static const char weekday[7][11] =
{
    {"周日"},
    {"周一"},
    {"周二"},
    {"周三"},
    {"周四"},
    {"周五"},
    {"周六"}
};


/*窗口ID*/
static int32_t g_window_id = -1;

//数据提示
static int32_t g_layer_id_text = -1;
//数据内容
static int32_t g_layer_id_data = -1;

//时间的句柄
static int32_t g_layer_id_time   = -1;
//日期的句柄
static int32_t g_layer_id_date   = -1;

//整个窗体句柄
static P_Window h_window;

void data_request_web()
{
        /*拼接url请求地址, 注意url的缓存大小*/
        char url[200] = "";       
        sprintf(url, "%s", DATA_WEB);               

        /*
                拼接过滤参数，即只接受和过滤参数匹配的返回值
                个人感觉这里的过滤可能是让手机做的，就是这里通知手机：json中的数据除了我制定的其他都过滤掉
        */

        /*发送一次*/
        g_comm_id_web = maibu_comm_request_web(url, "last", 0);
}

void add_text_layer(P_Window p_window, int32_t *p_layer_id, char *p_str, GRect *p_frame, enum GAlign align, int8_t font, enum GColor color)
{
    LayerText text_cfg = {p_str, *p_frame, align, font, 0};
    P_Layer layer = app_layer_create_text(&text_cfg);
    app_layer_set_bg_color(layer, color);

    P_Layer old_layer = app_window_get_layer_by_id(p_window, *p_layer_id);
    if(old_layer)
    {
        *p_layer_id = app_window_replace_layer(p_window, old_layer, layer);
    }
    else
    {
        *p_layer_id = app_window_add_layer(p_window, layer);
    }
}

static void add_time_bar(P_Window p_window)
{
    /* 添加时间图层 */
    uint8_t text_buf[40];
    struct date_time t;
    app_service_get_datetime(&t);

    memset(text_buf, 0, sizeof(text_buf));
    sprintf((char *)text_buf, "%s", (char *)&weekday[t.wday][0]);
    sprintf(&text_buf[6], "%02d-%02d", t.mon, t.mday);

    GRect frame;
    frame.origin.x = DATE_TEXT_POS_X;
    frame.origin.y = DATE_TEXT_POS_Y;
    frame.size.h   = DATE_TEXT_SIZE_H;
    frame.size.w   = DATE_TEXT_SIZE_W;

    add_text_layer(p_window, &g_layer_id_date, (char*)text_buf, &frame, GAlignLeft, U_ASCII_ARIAL_14, GColorWhite);

    frame.origin.x = TIME_TEXT_POS_X;
    frame.origin.y = TIME_TEXT_POS_Y;
    frame.size.h   = TIME_TEXT_SIZE_H;
    frame.size.w   = TIME_TEXT_SIZE_W;

    memset(text_buf, 0, sizeof(text_buf));
    sprintf(text_buf, "%02d:%02d", t.hour, t.min);

    add_text_layer(p_window, &g_layer_id_time, (char*)text_buf, &frame, GAlignLeft, U_ASCII_ARIAL_14, GColorWhite);
}

P_Window init_btc_window()
{
        static P_Window p_window;
       
        p_window = app_window_create();
        if (NULL == p_window)
        {
                return NULL;
        }

    /* 添加时间栏 */
    add_time_bar(p_window);

        /*加入你的代码 begin*/       

        /*添加数据提示信息*/
        GRect frame_main = {{0, 30}, {16, 128}};
    add_text_layer(p_window, &g_layer_id_text, "BTC", &frame_main, GAlignCenter, U_ASCII_ARIAL_14, GColorWhite);
       
        /*添加数据*/
        GRect frame_data = {{0, 60}, {16, 128}};
    add_text_layer(p_window, &g_layer_id_data, "waiting", &frame_data, GAlignCenter, U_ASCII_ARIAL_14, GColorWhite);
       
        return p_window;

}

void data_comm_result_callback(enum ECommResult result, uint32_t comm_id, void *context)
{

        /*如果上一次请求WEB通讯失败，并且通讯ID相同，则重新发送*/
        if ((result == ECommResultFail) && (comm_id == g_comm_id_web))
        {
                data_request_web();
        }
       
}

static void web_recv_callback(const uint8_t *buff, uint16_t size)
{
    char stock_gid[10];
        char i;

    maibu_get_json_str(buff, "last", stock_gid, 10);

        for (i=0;i<10;i++)
        {
        if (stock_gid[i]=='}')
                {
                        stock_gid[i]=0;
                }
        }

        /*添加数据*/
        GRect frame_data = {{0, 60}, {16, 128}};
    add_text_layer(h_window, &g_layer_id_data, stock_gid, &frame_data, GAlignCenter, U_ASCII_ARIAL_14, GColorWhite);
       
        app_window_update(h_window);
}

static void watch_time_change_callback(enum SysEventType type, void *context)
{
    /*时间更改，分变化*/
    if (type == SysEventTypeTimeChange)
    {
        uint8_t text_buf[40];
        struct date_time t;
        app_service_get_datetime(&t);

        memset(text_buf, 0, sizeof(text_buf));
        sprintf((char *)text_buf, "%s", (char *)&weekday[t.wday][0]);
        sprintf(&text_buf[6], "%02d-%02d", t.mon, t.mday);

        GRect frame;
        frame.origin.x = DATE_TEXT_POS_X;
        frame.origin.y = DATE_TEXT_POS_Y;
        frame.size.h   = DATE_TEXT_SIZE_H;
        frame.size.w   = DATE_TEXT_SIZE_W;

        add_text_layer(h_window, &g_layer_id_date, (char*)text_buf, &frame, GAlignLeft, U_ASCII_ARIAL_14, GColorWhite);

        frame.origin.x = TIME_TEXT_POS_X;
        frame.origin.y = TIME_TEXT_POS_Y;
        frame.size.h   = TIME_TEXT_SIZE_H;
        frame.size.w   = TIME_TEXT_SIZE_W;

        memset(text_buf, 0, sizeof(text_buf));
        sprintf(text_buf, "%02d:%02d", t.hour, t.min);

        add_text_layer(h_window, &g_layer_id_time, (char*)text_buf, &frame, GAlignLeft, U_ASCII_ARIAL_14, GColorWhite);

        app_window_update(h_window);
    }
}

static void data_timer_callback(date_time_t tick_time, uint32_t millis, void *context)
{
    data_request_web();
}

int main()
{
//simulator_init();//模拟接口
        /*创建消息列表窗口*/
        h_window = init_btc_window();

        //订阅时间改变事件
    maibu_service_sys_event_subscribe(watch_time_change_callback);
       
        /*放入窗口栈显示*/
        g_window_id = app_window_stack_push(h_window);

        data_request_web();

        /*注册通讯结果回调*/
        maibu_comm_register_result_callback(data_comm_result_callback);

        //注册网络请求回调函数
    maibu_comm_register_web_callback(web_recv_callback);

    //聚合数据源每隔10s更新数据
    app_window_timer_subscribe(h_window, 10000, data_timer_callback, (void *)h_window);
//simulator_wait();//模拟接口       
        return 0;

}

wulongchao

这类字符返回为什么，都不会触发回调函数，在浏览器都行。