CDPSession

• extends: [EventEmitter]

The CDPSession instances are used to talk raw Chrome Devtools Protocol:

• protocol methods can be called with session.send method.
• protocol events can be subscribed to with session.on method.

Useful links:

• Documentation on DevTools Protocol can be found here: DevTools Protocol Viewer.
• Getting Started with DevTools Protocol: https://github.com/aslushnikov/getting-started-with-cdp/blob/master/README.md

var client = await Page.Context.NewCDPSessionAsync(Page);
await client.SendAsync("Runtime.enable");
client.Event("Animation.animationCreated").OnEvent += (_, _) => Console.WriteLine("Animation created!");
var response = await client.SendAsync("Animation.getPlaybackRate");
var playbackRate = response.Value.GetProperty("playbackRate").GetDouble();
Console.WriteLine("playback rate is " + playbackRate);
await client.SendAsync("Animation.setPlaybackRate", new() { { "playbackRate", playbackRate / 2 } });

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Methods

DetachAsync

Added in: v1.8 cdpSession.DetachAsync

Detaches the CDPSession from the target. Once detached, the CDPSession object won't emit any events and can't be used to send messages.

Usage

await CdpSession.DetachAsync();

Returns

• void#

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Event

Added in: v.1.30 cdpSession.Event

Returns an event emitter for the given CDP event name.

Usage

CdpSession.Event(eventName);

Arguments

• eventName string Added in: v1.30#

  CDP event name.

Returns

• CDPSessionEvent#

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SendAsync

Added in: v1.8 cdpSession.SendAsync

Usage

await CdpSession.SendAsync(method, params);

Arguments

• method string#

  Protocol method name.

• args [Map]?<string, Args> (optional) Added in: v1.30#

  Optional method parameters.

Returns

• [JsonElement?]#