我正在使用 Xilium.CefGlue 和 Xilium.CefGlue.WPF 开发一个 wpf 应用程序。在 SampleCefApp 中实现 Xilium.CefGlue.CefApp.GetRenderProcessHandler() 后，我的 WPF 应用程序崩溃了。在此实施之前，应用程序运行良好，没有任何崩溃。实际上我需要通过 javascript 函数从 html 本地页面调用 C# 函数。此功能在 32 位版本中运行良好，但在 64 位版本中无法正常运行。以下是我的实现。
internal sealed class SampleCefApp : CefApp
{
public SampleCefApp()
{
}
private CefRenderProcessHandler renderProcessHandler = new Views.DemoRenderProcessHandler();
protected override CefRenderProcessHandler GetRenderProcessHandler()
{
return renderProcessHandler;
}
}
以下消息显示应用程序崩溃
<ProblemSignatures>
<EventType>APPCRASH</EventType>
<Parameter0>StreetMap.vshost.exe</Parameter0>
<Parameter1>14.0.23107.0</Parameter1>
<Parameter2>559b788a</Parameter2>
<Parameter3>libcef.DLL</Parameter3>
<Parameter4>3.2743.1449.0</Parameter4>
<Parameter5>57bbfe66</Parameter5>
<Parameter6>80000003</Parameter6>
<Parameter7>0000000000b68267</Parameter7>
</ProblemSignatures>
使用 64 位时 libcef dll 是否有任何问题。是否有人可以通过使用 Xilium.CefGlue 和 Xilium.CefGlue.WPF 来帮助实现 JS 到 C# 调用。我使用的以下参考代码来自链接 https://groups.google.com/forum/#!topic/cefglue/EhskGZ9OndY
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Threading;
using System;
namespace Xilium.CefGlue.Client {
internal sealed class DemoApp: CefApp {
private CefRenderProcessHandler renderProcessHandler = new DemoRenderProcessHandler();
protected override CefRenderProcessHandler GetRenderProcessHandler() {
return renderProcessHandler;
}
}
internal class DemoRenderProcessHandler: CefRenderProcessHandler {
MyCustomCefV8Handler myCefV8Handler = new MyCustomCefV8Handler();
protected override void OnWebKitInitialized() {
base.OnWebKitInitialized();
var nativeFunction = @ "nativeImplementation = function(onSuccess) {
native
function MyNativeFunction(onSuccess);
return MyNativeFunction(onSuccess);
};
";
CefRuntime.RegisterExtension("myExtension", nativeFunction, myCefV8Handler);
}
internal class MyCustomCefV8Handler: CefV8Handler {
protected override bool Execute(string name, CefV8Value obj, CefV8Value[] arguments, out CefV8Value returnValue,
out string exception) {
//Debugger.Launch();
var context = CefV8Context.GetCurrentContext();
var taskRunner = CefTaskRunner.GetForCurrentThread();
var callback = arguments[0];
new Thread(() => {
//Sleep a bit: to test whether the app remains responsive
Thread.Sleep(3000);
taskRunner.PostTask(new CefCallbackTask(context, callback));
}).Start();
returnValue = CefV8Value.CreateBool(true);
exception = null;
return true;
}
}
internal class CefCallbackTask: CefTask {
private readonly CefV8Context context;
private readonly CefV8Value callback;
public CefCallbackTask(CefV8Context context, CefV8Value callback) {
this.context = context;
this.callback = callback;
}
protected override void Execute() {
var callbackArguments = CreateCallbackArguments();
callback.ExecuteFunctionWithContext(context, null, callbackArguments);
}
private CefV8Value[] CreateCallbackArguments() {
var imageInBase64EncodedString = LoadImage(@ "C:\hamb.jpg");
context.Enter();
var imageV8String = CefV8Value.CreateString(imageInBase64EncodedString);
var featureV8Object = CefV8Value.CreateObject(null);
var listOfFeaturesV8Array = CefV8Value.CreateArray(1);
featureV8Object.SetValue("name", CefV8Value.CreateString("V8"), CefV8PropertyAttribute.None);
featureV8Object.SetValue("isEnabled", CefV8Value.CreateInt(0), CefV8PropertyAttribute.None);
featureV8Object.SetValue("isFromJSCode", CefV8Value.CreateBool(false), CefV8PropertyAttribute.None);
listOfFeaturesV8Array.SetValue(0, featureV8Object);
context.Exit();
return new [] {
listOfFeaturesV8Array,
imageV8String
};
}
private string LoadImage(string fileName) {
using(var memoryStream = new MemoryStream()) {
var image = Bitmap.FromFile(fileName);
image.Save(memoryStream, ImageFormat.Png);
byte[] imageBytes = memoryStream.ToArray();
return Convert.ToBase64String(imageBytes);
}
}
}
}
我首先加载的HTML文件：
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title>C# and JS experiments</title>
<script src="index.js"></script>
</head>
<body>
<h1>C# and JS are best friends</h1>
<div id="features"></div>
<div id="image"></div>
</body>
</html>
JavaScript代码：
function Browser() {
}
Browser.prototype.ListAllFeatures = function(onSuccess) {
return nativeImplementation(onSuccess);
}
function App(browser) {
this.browser = browser;
}
App.prototype.Run = function() {
var beforeRun = new Date().getTime();
this.browser.ListAllFeatures(function(features, imageInBase64EncodedString) {
var feautersListString = '';
for (var i = 0; i < features.length; i++) {
var f = features[i];
feautersListString += ('<p>' + 'Name: ' + f.name + ', is enabled: ' + f.isEnabled + ', is called from js code: ' + f.isFromJSCode + '</p>');
}
feautersListString += '<p> The image: </p>';
feautersListString += '<p>' + imageInBase64EncodedString + '</p>';
document.getElementById("features").innerHTML = feautersListString;
var afterRun = new Date().getTime();
document.getElementById("image").innerHTML = '<img src="data:image/png;base64,' + imageInBase64EncodedString + '" />';
var afterLoadedImage = new Date().getTime();
console.log("ELAPSED TIME - INSIDE LIST ALL FEATURES: " + (afterRun - beforeRun));
console.log("ELAPSED TIME - IMAGE IS LOADED TO THE <img> TAG: " + (afterLoadedImage - beforeRun));
});
}
window.onload = function() {
var browser = new Browser();
var application = new App(browser);
//Lets measure
var beforeRun = new Date().getTime();
application.Run();
var afterRun = new Date().getTime();
console.log("ELAPSED TIME - INSIDE ONLOAD: " + (afterRun - beforeRun));
}
任何帮助表示赞赏。