Xilium.CefGlue如何使用返回值执行JavaScript？ [英] Xilium.CefGlue how to execute JavaScript with return Value?

问题描述

我在编程多线程很新，我无法从xelium例子明白我怎么能执行一个JavaScript并获得返回值。
我已经测试：

I'm quite new in programming multi-threading and I could not understand from the xelium example how I could execute a javascript and get the return value. I have tested:

browser.GetMainFrame().ExecuteJavaScript("SetContent('my Text.')", null, 0);

JavaScript的执行，但我这个功能不会让我得到的返回值。
我需要执行下面的函数来获取所有的用户都写在盒子..

the javascript is executed, but I this function don’t allow me to get the return value. I should execute the following function to get all the text the user have written in the box..

browser.GetMainFrame().ExecuteJavaScript("getContent('')", null, 0);

功能 TryEval 应该这样做...

browser.GetMainFrame().V8Context.TryEval("GetDirtyFlag", out returninformation , out exx);

但这个功能不能从浏览器调用，我认为它必须从渲染器中调用？我该怎么办呢？

But this function can’t be called from the browser, I think it must be called from the renderer? How can I do so?

我不明白关于 CefRenderProcessHandler 的解释和 OnProcessMessageReceived ..如何注册一个脚本化的对象，并设置我的JavaScript和放大器;参数？

I couldn’t understand the explanations about CefRenderProcessHandler and OnProcessMessageReceived.. How to register a Scriptable Object and set my javascript & parameters?

THX的任何建议，我怎么能解决这个问题！

Thx for any suggestions how I could solve this!

推荐答案

看看这篇文章： https://groups.google.com/forum/ ！＃话题/ cefglue / CziVAo8Ojg4

using System;
using System.Windows.Forms;
using Xilium.CefGlue;
using Xilium.CefGlue.WindowsForms;

namespace CefGlue3
{
  public partial class Form1 : Form
  {
    private CefWebBrowser browser;

    public Form1()
    {
      InitializeCef();
      InitializeComponent();
    }

    private static void InitializeCef()
    {
      CefRuntime.Load();
      CefMainArgs cefArgs = new CefMainArgs(new[] {"--force-renderer-accessibility"});
      CefApplication cefApp = new CefApplication();
      CefRuntime.ExecuteProcess(cefArgs, cefApp);
      CefSettings cefSettings = new CefSettings
      {
        SingleProcess = false, 
        MultiThreadedMessageLoop = true, 
        LogSeverity = CefLogSeverity.ErrorReport, 
        LogFile = "CefGlue.log",
      };
      CefRuntime.Initialize(cefArgs, cefSettings, cefApp);
    }

    private void Form1_Load(object sender, EventArgs e)
    {
      browser = new CefWebBrowser
      {
        Visible = true,
        //StartUrl = "http://www.google.com",
        Dock = DockStyle.Fill,
        Parent = this
      };
      Controls.Add(browser);
      browser.BrowserCreated += BrowserOnBrowserCreated;
    }

    private void BrowserOnBrowserCreated(object sender, EventArgs eventArgs)
    {
      browser.Browser.GetMainFrame().LoadUrl("http://www.google.com");
    }
  }
}

using Xilium.CefGlue;

namespace CefGlue3
{
  internal sealed class CefApplication : CefApp
  {
    protected override CefRenderProcessHandler GetRenderProcessHandler()
    {
      return new RenderProcessHandler();
    }
  }

  internal sealed class RenderProcessHandler : CefRenderProcessHandler
  {
    protected override void OnWebKitInitialized()
    {
      CefRuntime.RegisterExtension("testExtension", "var test;if (!test)test = {};(function() {test.myval = 'My Value!';})();", null);
      base.OnWebKitInitialized();
    }
  }
}

这篇关于Xilium.CefGlue如何使用返回值执行JavaScript？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！