diff options
Diffstat (limited to 'v_windows/v/examples/get_weather')
| -rw-r--r-- | v_windows/v/examples/get_weather/README.md | 23 | ||||
| -rw-r--r-- | v_windows/v/examples/get_weather/get_weather.v | 55 | 
2 files changed, 78 insertions, 0 deletions
diff --git a/v_windows/v/examples/get_weather/README.md b/v_windows/v/examples/get_weather/README.md new file mode 100644 index 0000000..be2695d --- /dev/null +++ b/v_windows/v/examples/get_weather/README.md @@ -0,0 +1,23 @@ +# get_weather +get_weather is a very simple web crawler. +Its goal is to get a weather forecast from caiyunapp.com.   + +# Compile and Run + +Use this to generate an executable and then launch the web crawler. +```bash +v get_weather.v +./get_weather +``` + +As a convenience, you can also compile and launch the web crawler directly. +```bash +v run get_weather.v +``` + +In this project we use http.fetch() to get a http.Response, with a +custom user-agent and then we use json.decode() to decode the json  +response to struct. +We also use a `[skip]` attribute to skip certain fields in the response, +that we don't need and use a `[json: result]` attribute to specify that +our struct field is named differently from the incoming json response. diff --git a/v_windows/v/examples/get_weather/get_weather.v b/v_windows/v/examples/get_weather/get_weather.v new file mode 100644 index 0000000..4de0572 --- /dev/null +++ b/v_windows/v/examples/get_weather/get_weather.v @@ -0,0 +1,55 @@ +import json +import rand +import net.http + +struct Weather { +	status      string [skip] // drop this field +	api_version string [skip] +	api_status  string [skip] +	lang        string [skip] +	unit        string [skip] +	tzshift     int    [skip] +	timezone    string [skip] +	server_time u32    [skip] +	location    []f32  [skip] +	result      Result //[json: result] if the field name is different in JSON, it can be specified +} + +struct Result { +	realtime          Realtime [skip] +	minutely          Minutely [skip] +	hourly            Hourly   [skip] +	daily             Daily    [skip] +	primary           int      [skip] +	forecast_keypoint string +} + +struct Realtime {} + +struct Minutely {} + +struct Hourly {} + +struct Daily {} + +fn main() { +	config := http.FetchConfig{ +		user_agent: 'Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0' +	} + +	rnd := rand.f32() +	url := 'https://api.caiyunapp.com/v2.5/96Ly7wgKGq6FhllM/116.391912,40.010711/weather.jsonp?hourlysteps=120&random=$rnd' +	// println(url) + +	resp := http.fetch(http.FetchConfig{ ...config, url: url }) or { +		println('failed to fetch data from the server') +		return +	} + +	weather := json.decode(Weather, resp.text) or { +		println('failed to decode weather json') +		return +	} + +	println('未来两小时天气:\n${weather.result.forecast_keypoint}.') +}  | 
