Zig

Google Calendar Search Events (List Events with Optional Query Parameters)

See more Google Calendar Examples

Demonstrates how to specify optional query parameters for listing events. This example uses the "q" parameter to free-text search for events, and uses the "timeMin" parameter to specify a lower bound for an event's end time. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // This example uses a previously obtained access token having permission for the
    // Google Calendar scope.

    // In this example, Get Google Calendar OAuth2 Access Token, the access
    // token was saved to a JSON file.  This example fetches the access token from the file..
    const json_token = try chilkat.JsonObject.init();
    defer json_token.deinit();
    try json_token.loadFile("qa_data/tokens/googleCalendar.json");
    if (!json_token.hasMember("access_token")) {
        std.debug.print("No access token found.\n", .{});
        return;
    }

    const http = try chilkat.Http.init();
    defer http.deinit();
    http.setAuthToken(try json_token.stringOf(alloc, "access_token"));

    // We'll want to build a URL with the query params..
    const sb_url = try chilkat.StringBuilder.init();
    defer sb_url.deinit();
    sb_url.append("https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events?") catch {};

    // Use the HTTP request object as a helper for creating the URL encoded query param list..
    const req = try chilkat.HttpRequest.init();
    defer req.deinit();

    // Find events with the word "pizza".
    req.addParam("q", "pizza");

    // Get events for the current date/time or later.
    const dt = try chilkat.DateTime.init();
    defer dt.deinit();
    dt.setFromCurrentSystemTime() catch {};
    req.addParam("timeMin", try dt.getAsTimestamp(alloc, false));

    // Add these query params to the URL:
    sb_url.append(try req.getUrlEncodedParams(alloc)) catch {};

    // Examine the URL..
    std.debug.print("URL: {s}\n", .{try sb_url.getAsString(alloc)});

    // The URL looks like this:
    // https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events?q=pizza&timeMin=2017-08-11T13%3A35%3A28Z

    // Let's get events in the primary calendar.  A calendar ID could have be used instead of "primary".
    http.setUrlVar("calendarId", "primary") catch {};
    const sb_response = try chilkat.StringBuilder.init();
    defer sb_response.deinit();
    http.quickGetSb(try sb_url.getAsString(alloc), sb_response) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    if (http.getLastStatus() != 200) {
        // Note: If a 401 unauthorized response is received, it likely means that the OAuth2 access token needs
        // to be refreshed or re-fetched.
        std.debug.print("Error response status: {d}\n", .{http.getLastStatus()});
        std.debug.print("{s}\n", .{try sb_response.getAsString(alloc)});
        return;
    }

    std.debug.print("{s}\n", .{try sb_response.getAsString(alloc)});

    // A sample JSON response:
    // (Code for parsing the Google Calendar events is shown below.)

    // {
    //  "kind": "calendar#events",
    //  "etag": "\"p32cafkumkb7ta0g\"",
    //  "summary": "support@chilkatcloud.com",
    //  "updated": "2017-08-11T13:19:48.143Z",
    //  "timeZone": "America/Chicago",
    //  "accessRole": "owner",
    //  "defaultReminders": [
    //   {
    //    "method": "popup",
    //    "minutes": 10
    //   }
    //  ],
    //  "nextSyncToken": "CJin09aiz9UCEJin09aiz9UCGAU=",
    //  "items": [
    //   {
    //    "kind": "calendar#event",
    //    "etag": "\"3004915160212000\"",
    //    "id": "02pv1cpdp7vm11htnfi3ii7iie",
    //    "status": "confirmed",
    //    "htmlLink": "https://www.google.com/calendar/event?eid=MDJwdjFjcGRwN3ZtMTFodG5maTNpaTdpaWUgc3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t",
    //    "created": "2017-08-11T13:19:40.000Z",
    //    "updated": "2017-08-11T13:19:40.106Z",
    //    "summary": "Eat Lou Malnati's Pizza",
    //    "creator": {
    //     "email": "support@chilkatcloud.com",
    //     "self": true
    //    },
    //    "organizer": {
    //     "email": "support@chilkatcloud.com",
    //     "self": true
    //    },
    //    "start": {
    //     "dateTime": "2017-08-12T12:00:00-05:00"
    //    },
    //    "end": {
    //     "dateTime": "2017-08-12T13:00:00-05:00"
    //    },
    //    "iCalUID": "02pv1cpdp7vm11htnfi3ii7iie@google.com",
    //    "sequence": 0,
    //    "hangoutLink": "https://plus.google.com/hangouts/_/chilkatcloud.com/support?hceid=c3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t.02pv1cpdp7vm11htnfi3ii7iie",
    //    "reminders": {
    //     "useDefault": true
    //    }
    //   }
    //  ]
    // }
    //
    //

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.loadSb(sb_response) catch {};

    const num_events = json.sizeOfArray("items");
    var i: i32 = 0;
    while (i < num_events) {
        json.setI(i);
        std.debug.print("{s}\n", .{try json.stringOf(alloc, "items[i].summary")});
        std.debug.print("{s}\n", .{try json.stringOf(alloc, "items[i].start.dateTime")});
        std.debug.print("{s}\n", .{try json.stringOf(alloc, "items[i].end.dateTime")});
        std.debug.print("--\n", .{});
        i = i + 1;
    }

    // Sample output:

    // Eat Lou Malnati's Pizza
    // 2017-08-12T12:00:00-05:00
    // 2017-08-12T13:00:00-05:00
    // --
}