private static async Task CreatePromiseAsync(IJsObject window)
{
//It is also possible to create a wrapper class for IJsObject that simplifies appending the
//handlers and type checks. Such approach can be used to integrate JavaScript promises
//with async/await in the .NET application.
//Create a promise that is fulfilled and wrap this promise
Console.WriteLine("\nCreate another promise that is fulfilled...");
JsPromise promise3 = window.Invoke <IJsObject>("CreatePromise", true).AsPromise();
JsPromise.Result result = await promise3.Then(o =>
{
Console.WriteLine($"Callback:Success: {o}");
return(o);
})
.ResolveAsync();
Console.WriteLine($"Result state:{result?.State}");
Console.WriteLine($"Result type:{(result?.Data?.GetType().ToString() ?? "null")}");
//Create a promise that is rejected and wrap this promise
Console.WriteLine("\nCreate another promise that is rejected...");
JsPromise promise4 = window.Invoke <IJsObject>("CreatePromise", false).AsPromise();
result = await promise4.ResolveAsync();
Console.WriteLine($"Result state:{result?.State}");
Console.WriteLine($"Result type:{(result?.Data?.GetType().ToString() ?? "null")}");
}
private static void Main(string[] args)
{
try
{
Size browserSize = new Size(500, 500);
using (IEngine engine = EngineFactory.Create(new EngineOptions.Builder
{
RenderingMode = RenderingMode.OffScreen,
ChromiumSwitches = { "--allow-file-access-from-files" }
}.Build()))
{
Console.WriteLine("Engine created");
using (IBrowser browser = engine.CreateBrowser())
{
// 1. Resize browser to the required dimension.
browser.Size = browserSize;
// 2. Load the required web page and wait until it is loaded completely.
browser.Navigation.LoadUrl(Path.GetFullPath("sample.html")).Wait();
// 3. Create canvas, set its width and height
IJsObject canvas = browser
.MainFrame.ExecuteJavaScript <IJsObject>("document.createElement('canvas');")
.Result;
IElement image = browser.MainFrame.Document.GetElementByTagName("img");
string width = image.Attributes["width"];
canvas.Properties["width"] = width;
string height = image.Attributes["height"];
canvas.Properties["height"] = height;
// 4. Get the canvas context and draw the image on it
IJsObject ctx = canvas.Invoke("getContext", "2d") as IJsObject;
ctx.Invoke("drawImage", image, 0, 0);
// 5. Get the data URL and convert it to bytes
string dataUrl = canvas.Invoke("toDataURL", "image/png") as string;
Console.WriteLine("Data URL: " + dataUrl);
byte[] bitmapData = Convert.FromBase64String(FixBase64ForImage(dataUrl));
// 4. Save image to file.
using (FileStream fs = new FileStream("image.png", FileMode.Create, FileAccess.Write))
{
fs.Write(bitmapData, 0, bitmapData.Length);
}
Console.WriteLine("Image saved.");
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
}
public static void Main()
{
try
{
using (IEngine engine = EngineFactory.Create())
{
Console.WriteLine("Engine created");
using (IBrowser browser = engine.CreateBrowser())
{
Console.WriteLine("Browser created");
browser.Size = new Size(700, 500);
browser.MainFrame.LoadHtml(@"<html>
<body>
<script type='text/javascript'>
function CreatePromise(success)
{
return new Promise(function(resolve, reject) {
if(success) {
resolve('Promise fulfilled.');
}
else {
reject('Promise rejected.');
}
});
};
</script>
</body>
</html>")
.Wait();
IJsObject window = browser.MainFrame.ExecuteJavaScript <IJsObject>("window").Result;
//Prepare promise handlers
Action <object> promiseResolvedHandler = o => Console.WriteLine("Success: " + o);
Action <object> promiseRejectedHandler = o => Console.Error.WriteLine("Error: " + o);
//Create a promise that is fulfilled
Console.WriteLine("Create a promise that is fulfilled...");
IJsObject promise1 = window.Invoke <IJsObject>("CreatePromise", true);
//Append fulfillment and rejection handlers to the promise
promise1.Invoke("then", promiseResolvedHandler, promiseRejectedHandler);
//Create a promise that is rejected
Console.WriteLine("Create a promise that is rejected...");
IJsObject promise2 = window.Invoke <IJsObject>("CreatePromise", false);
//Append fulfillment and rejection handlers to the promise
promise2.Invoke("then", promiseResolvedHandler, promiseRejectedHandler);
CreatePromiseAsync(window).Wait();
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
}
public static void Main()
{
using (IEngine engine = EngineFactory.Create())
{
using (IBrowser browser = engine.CreateBrowser())
{
browser.Size = new Size(700, 500);
byte[] htmlBytes = Encoding.UTF8.GetBytes(@"<html>
<body>
<script type='text/javascript'>
function CreatePromise(success)
{
return new Promise(function(resolve, reject) {
if(success) {
resolve('Promise fulfilled.');
}
else {
reject('Promise rejected.');
}
});
};
</script>
</body>
</html>");
browser.Navigation
.LoadUrl($"data:text/html;base64,{Convert.ToBase64String(htmlBytes)}")
.Wait();
IJsObject window = browser.MainFrame
.ExecuteJavaScript <IJsObject>("window")
.Result;
//Prepare promise handlers
Action <object> promiseResolvedHandler =
o => Console.WriteLine($"Success: {o}");
Action <object> promiseRejectedHandler =
o => Console.Error.WriteLine($"Error: {o}");
//Create a promise that is fulfilled
Console.WriteLine("Create a promise that is fulfilled...");
IJsObject promise1 = window.Invoke <IJsObject>("CreatePromise", true);
//Append fulfillment and rejection handlers to the promise
promise1.Invoke("then", promiseResolvedHandler, promiseRejectedHandler);
//Create a promise that is rejected
Console.WriteLine("Create a promise that is rejected...");
IJsObject promise2 = window.Invoke <IJsObject>("CreatePromise", false);
//Append fulfillment and rejection handlers to the promise
promise2.Invoke("then", promiseResolvedHandler, promiseRejectedHandler);
CreatePromiseAsync(window).Wait();
}
}
Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
}
private void OnPositionChanged()
{
IJsObject jsPosition = panorama.Invoke <IJsObject>("getPosition");
double latitude = jsPosition.Invoke <double>("lat");
double longitude = jsPosition.Invoke <double>("lng");
position = new LatLng(latitude, longitude);
PositionChanged?.Invoke(this, EventArgs.Empty);
}
public static void Main()
{
try
{
using (IEngine engine = EngineFactory.Create(new EngineOptions.Builder().Build()))
{
Console.WriteLine("Engine created");
using (IBrowser browser = engine.CreateBrowser())
{
Console.WriteLine("Browser created");
IJsObject document = browser.MainFrame.ExecuteJavaScript <IJsObject>("document").Result;
// document.title = "New Title"
document.Properties["title"] = "New Title";
// document.write("Hello World!")
document.Invoke("write", "Hello World!");
string documentContent =
browser.MainFrame.ExecuteJavaScript <string>("document.body.innerText").Result;
Console.Out.WriteLine("New content: " + documentContent);
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
}
public static void Main()
{
using (IEngine engine = EngineFactory.Create())
{
using (IBrowser browser = engine.CreateBrowser())
{
IJsObject document = browser.MainFrame
.ExecuteJavaScript <IJsObject>("document")
.Result;
// document.title = "New Title"
document.Properties["title"] = "New Title";
// document.write("Hello World!")
document.Invoke("write", "Hello World!");
string documentContent =
browser.MainFrame
.ExecuteJavaScript <string>("document.body.innerText")
.Result;
Console.Out.WriteLine($"New content: {documentContent}");
}
}
Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
}
private static bool IsPromise(IJsObject jsObject)
{
if (jsObject == null || jsObject.IsDisposed)
{
return(false);
}
IJsObject promisePrototype = jsObject.Frame.ExecuteJavaScript <IJsObject>("Promise.prototype").Result;
return(promisePrototype.Invoke <bool>("isPrototypeOf", jsObject));
}
public static void Main()
{
try
{
LoggerProvider.Instance.Level = SourceLevels.Information;
LoggerProvider.Instance.FileLoggingEnabled = true;
LoggerProvider.Instance.OutputFile = "dnb.log";
using (IEngine engine = EngineFactory.Create(new EngineOptions.Builder().Build()))
{
Console.WriteLine("Engine created");
using (IBrowser browser = engine.CreateBrowser())
{
Console.WriteLine("Browser created");
browser.Size = new Size(700, 500);
browser.MainFrame.LoadHtml(@"<html>
<body>
<script type='text/javascript'>
var ShowData = function (a)
{
document.title = a.FullName
+ ' ' + a.Age + '. ' + a.Walk(a.Children.get_Item(1))
+ ' ' + a.Children.get_Item(1).FullName
+ ' ' + a.Children.get_Item(1).Age;
};
</script>
</body>
</html>")
.Wait();
Person person = new Person("Jack", 30, true)
{
Children = new Dictionary <double, Person>()
};
person.Children.Add(1.0, new Person("Oliver", 10, true));
IJsObject value = browser.MainFrame.ExecuteJavaScript <IJsObject>("window").Result;
value.Invoke("ShowData", person);
Console.WriteLine($"\tBrowser title: {browser.Title}");
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
}
public static void Main()
{
LoggerProvider.Instance.Level = SourceLevels.Information;
LoggerProvider.Instance.FileLoggingEnabled = true;
LoggerProvider.Instance.OutputFile = "dnb.log";
using (IEngine engine = EngineFactory.Create())
{
using (IBrowser browser = engine.CreateBrowser())
{
browser.Size = new Size(700, 500);
byte[] htmlBytes = Encoding.UTF8.GetBytes(@"<html>
<body>
<script type='text/javascript'>
var ShowData = function (a)
{
document.title = a.FullName
+ ' ' + a.Age + '. ' + a.Walk(a.Children.get_Item(1))
+ ' ' + a.Children.get_Item(1).FullName
+ ' ' + a.Children.get_Item(1).Age;
};
</script>
</body>
</html>");
browser.Navigation
.LoadUrl($"data:text/html;base64,{Convert.ToBase64String(htmlBytes)}")
.Wait();
Person person = new Person("Jack", 30, true)
{
Children = new Dictionary <double, Person>()
};
person.Children.Add(1.0, new Person("Oliver", 10, true));
IJsObject value = browser.MainFrame
.ExecuteJavaScript <IJsObject>("window")
.Result;
value.Invoke("ShowData", person);
Console.WriteLine($"\tBrowser title: {browser.Title}");
}
}
Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
}
private static void Main(string[] args)
{
using (IEngine engine = EngineFactory.Create())
{
using (IBrowser browser = engine.CreateBrowser())
{
browser.Size = new Size(1024, 768);
browser.Navigation.LoadUrl(Path.GetFullPath("example.html")).Wait();
Console.WriteLine("URL loaded");
IDocument document = browser.MainFrame.Document;
IJsObject container = document.GetElementById("container") as IJsObject;
//Create shadow root.
INode shadowRoot = container?.Invoke <INode>("attachShadow",
browser
.MainFrame
.ParseJsonString("{\"mode\": \"open\"}"));
Console.WriteLine($"Shadow root created: {(shadowRoot != null)}");
//Fetch shadow root.
shadowRoot = container?.Properties["shadowRoot"] as INode;
Console.WriteLine($"Shadow root fetched: {(shadowRoot != null)}");
//Add node to shadow root.
IElement inside = document.CreateElement("h1");
inside.InnerText = "Inside Shadow DOM";
inside.Attributes["id"] = "inside";
shadowRoot?.Children.Append(inside);
//Find new node in shadow root.
IElement element = shadowRoot?.GetElementById("inside");
Console.WriteLine($"Inside element inner text: {element?.InnerText}");
//Try finding the same node from the main document.
element = document.GetElementById("inside");
Console.WriteLine($"Inside element found in the document: {(element != null)}");
}
}
Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
}
private void AddListener(string eventName, Action handler)
{
panorama.Invoke("addListener", eventName, handler);
}