AWTK-WEB快速入门(3)-C语言Http应用程序

// C 函数，用于处理接收到的数据void home_page_on_fetch_data(void* ctx, const char* data, uint32_t data_size) {  widget_t* win = WIDGET(ctx);
  conf_doc_t* doc = conf_doc_load_json(data, data_size);  if (doc != NULL) {    const char* city = conf_doc_get_str(doc, "cityInfo.city", "unknown");    const char* shidu = conf_doc_get_str(doc, "data.shidu", "unknown");    const char* wendu = conf_doc_get_str(doc, "data.wendu", "unknown");    const char* quality = conf_doc_get_str(doc, "data.quality", "unknown");    const char* ganmao = conf_doc_get_str(doc, "data.ganmao", "unknown");    double pm25 = conf_doc_get_float(doc, "data.pm25", 0);
    widget_set_child_text_utf8(win, "city", city);    widget_set_child_text_utf8(win, "shidu", shidu);    widget_set_child_text_utf8(win, "wendu", wendu);    widget_set_child_text_utf8(win, "quality", quality);    widget_set_child_text_utf8(win, "ganmao", ganmao);    widget_set_child_text_with_double(win, "pm25", "%.0f", pm25);
    conf_doc_destroy(doc);  }
  printf("Received data (%d bytes): %s\n", data_size, data);}
// C 函数，用于处理错误void home_page_on_fetch_error(void* ctx, const char* error_message) {  printf("Error: %s\n", error_message);}
static ret_t on_update(void* ctx, event_t* e) {  widget_t* win = WIDGET(ctx);  const char* url = "http://localhost:8080/AwtkApplicationCHttp/res/assets/default/raw/data/weather.json";  return_value_if_fail(win != NULL, RET_BAD_PARAMS);
  fetch_data(win, "GET", url, home_page_on_fetch_data, home_page_on_fetch_error, NULL);
  return RET_OK;}
/** * 初始化窗口 */ret_t home_page_init(widget_t* win, void* ctx) {  (void)ctx;  return_value_if_fail(win != NULL, RET_BAD_PARAMS);
  widget_child_on(win, "update", EVT_CLICK, on_update, win);
  return RET_OK;}