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2.1 实现过程： (1)、定义一个DemoRenderProcessHandler，继承自CefRenderProcessHandler (2)、重写DemoRenderProcessHandler里的OnWebKitInitialized ( )事件 (3)、定义一个ExampleAv8Handler，继承自CefV8Handler (4)、在ExampleAv8Handler里的Execute ( )事件中，写你要执行的操作代码 (5)、在Execute ( )事件中，利用委托进行回调，把要操作的代码回调执行 (6)、在OnWebKitInitialized ( )事件里面new ExampleAv8Handler ( )，根据类的实际情况，人工手写JS脚本代码，通过官方提供的RegisterExtension(string extensionName, string javascriptCode, CefV8Handler handler)方法进行注册 (7)、写一个网页，去前台通过JS调用 2.2 核心代码： /// <summary> /// DemoRenderProcessHandler.cs /// </summary> #region 声明委托回调 /// <summary> /// 网页脚本与后台程序交互方法 /// 提示一：V8HandlerDelegate要在namespace下面定义，不要写到class里去了 /// 提示二：如果 returnValue = null; 则会导致网页前端出现错误：Cannot read property ’constructor’ of undefined /// 提示三：还存在其他的可能，导致导致网页前端出现错误：Cannot read property ’constructor’ of undefined /// </summary> /// <param name=”name”>名称</param> /// <param name=”obj”>对象</param> /// <param name=”arguments”>参数</param> /// <param name=”returnValue”>返回值</param> /// <param name=”exception”>返回异常信息</param> /// <returns></returns> public delegate void V8HandlerDelegate(string name, CefV8Value obj, CefV8Value[] arguments, out CefV8Value returnValue, out string exception); #endregion 声明委托回调 #region 声明常量变量 /// <summary> /// 绑定测试处理器B /// </summary> private ExampleBv8Handler exampleB; /// <summary> /// 委托回调 /// </summary> public V8HandlerDelegate CallBack { get; set; } #endregion 声明常量变量 protected override void OnWebKitInitialized() { #region 回调方式注册 ExampleB exampleB = new ExampleBv8Handler { CallBack = CallBackMethod }; const string exampleBJavascriptCode = @”function exampleB() {} if (!exampleB) exampleB = {}; (function() { exampleB.__defineGetter__(‘myProperty’, function() { native function MyProperty(); return MyProperty(); }); exampleB.__defineGetter__(‘myReadOnlyProperty’, function() { native function MyReadOnlyProperty(); return MyReadOnlyProperty(); }); exampleB.__defineGetter__(‘myUnconvertibleProperty’, function() { native function MyUnconvertibleProperty(); return MyUnconvertibleProperty(); }); exampleB.repeat = function(str,n) { native function Repeat(str,n); return Repeat(str,n); }; exampleB.echoVoid = function() { native function EchoVoid(); EchoVoid(); }; exampleB.echoBoolean = function(arg0) { native function EchoBoolean(arg0); return EchoBoolean(arg0); }; exampleB.echoNullableBoolean = function(arg0) { native function EchoNullableBoolean(arg0); return EchoNullableBoolean(arg0); }; exampleB.echoSByte = function(arg0) { native function EchoSByte(arg0); return EchoSByte(arg0); }; exampleB.echoNullableSByte = function(arg0) { native function EchoNullableSByte(arg0); return EchoNullableSByte(arg0); }; exampleB.echoInt16 = function(arg0) { native function EchoInt16(arg0); return EchoInt16(arg0); }; exampleB.echoNullableInt16 = function(arg0) { native function EchoNullableInt16(arg0); return EchoNullableInt16(arg0); }; exampleB.echoInt32 = function(arg0) { native function EchoInt32(arg0); return EchoInt32(arg0); }; exampleB.echoNullableInt32 = function(arg0) { native function EchoNullableInt32(arg0); return EchoNullableInt32(arg0); }; exampleB.echoInt64 = function(arg0) { native function EchoInt64(arg0); return EchoInt64(arg0); }; exampleB.echoNullableInt64 = function(arg0) { native function EchoNullableInt64(arg0); return EchoNullableInt64(arg0); }; exampleB.echoByte = function(arg0) { native function EchoByte(arg0); return EchoByte(arg0); }; exampleB.echoNullableByte = function(arg0) { native function EchoNullableByte(arg0); return EchoNullableByte(arg0); }; exampleB.echoUInt16 = function(arg0) { native function EchoUInt16(arg0); return EchoUInt16(arg0); }; exampleB.echoUInt32 = function(arg0) { native function EchoUInt32(arg0); return EchoUInt32(arg0); }; exampleB.echoNullableUInt32 = function(arg0) { native function EchoNullableUInt32(arg0); return EchoNullableUInt32(arg0); }; exampleB.echoUInt64 = function(arg0) { native function EchoUInt64(arg0); return EchoUInt64(arg0); }; exampleB.echoNullableUInt64 = function(arg0) { native function EchoNullableUInt64(arg0); return EchoNullableUInt64(arg0); }; exampleB.echoSingle = function(arg0) { native function EchoSingle(arg0); return EchoSingle(arg0); }; exampleB.echoNullableSingle = function(arg0) { native function EchoNullableSingle(arg0); return EchoNullableSingle(arg0); }; exampleB.echoDouble = function(arg0) { native function EchoDouble(arg0); return EchoDouble(arg0); }; exampleB.echoNullableDouble = function(arg0) { native function EchoNullableDouble(arg0); return EchoNullableDouble(arg0); }; exampleB.echoChar = function(arg0) { native function EchoChar(arg0); return EchoChar(arg0); }; exampleB.echoNullableChar = function(arg0) { native function EchoNullableChar(arg0); return EchoNullableChar(arg0); }; exampleB.echoDateTime = function(arg0) { native function EchoDateTime(arg0); return EchoDateTime(arg0); }; exampleB.echoNullableDateTime = function(arg0) { native function EchoNullableDateTime(arg0); return EchoNullableDateTime(arg0); }; exampleB.echoDecimal = function(arg0) { native function EchoDecimal(arg0); return EchoDecimal(arg0); }; exampleB.echoNullableDecimal = function(arg0) { native function EchoNullableDecimal(arg0); return EchoNullableDecimal(arg0); }; exampleB.echoString = function(arg0) { native function EchoString(arg0); return EchoString(arg0); }; exampleB.lowercaseMethod = function(arg0) { native function LowercaseMethod(arg0); return LowercaseMethod(arg0); }; })();”; CefRuntime.RegisterExtension(“exampleBExtensionName”, exampleBJavascriptCode, exampleB); #endregion 回调方式注册 ExampleB base.OnWebKitInitialized(); } #region 方法 /// <summary> /// 利用委托回调方法 /// 注意：如果 returnValue = null; 则会导致网页前端出现错误：Cannot read property ’constructor’ of undefined /// </summary> /// <param name=”name”></param> /// <param name=”obj”></param> /// <param name=”arguments”></param> /// <param name=”returnValue”></param> /// <param name=”exception”></param> public void CallBackMethod(string name, CefV8Value obj, CefV8Value[] arguments, out CefV8Value returnValue, out string exception) { returnValue = CefV8Value.CreateString(string.Empty); exception = null; } #endregion 方法 /// <summary> /// ExampleBv8Handler.cs /// </summary> /// <summary> /// 绑定测试处理器 /// </summary> public class ExampleBv8Handler : CefV8Handler { #region 声明常量变量 /// <summary> /// 我的属性 /// </summary> public int MyProperty { get; set; } /// <summary> /// 我的只读属性 /// </summary> public string MyReadOnlyProperty { get; internal set; } /// <summary> /// 我不能转换的属性 /// </summary> public Type MyUnconvertibleProperty { get; set; } /// <summary> /// 委托回调 /// </summary> public V8HandlerDelegate CallBack { get; set; } #endregion 声明常量变量 #region 构造函数 /// <summary> /// 默认构造函数 /// </summary> public ExampleBv8Handler() { MyProperty = 100; MyReadOnlyProperty = “flydoos@vip.qq.com”; MyUnconvertibleProperty = GetType(); } #endregion 构造函数 #region 事件 /// <summary> /// 网页脚本与后台程序交互方法 /// 提示一：如果 returnValue = null; 则会导致网页前端出现错误：Cannot read property ’constructor’ of undefined /// 提示二：还存在其他的可能，导致导致网页前端出现错误：Cannot read property ’constructor’ of undefined /// </summary> /// <param name=”name”>名称</param> /// <param name=”obj”>对象</param> /// <param name=”arguments”>参数</param> /// <param name=”returnValue”>返回值</param> /// <param name=”exception”>返回异常信息</param> /// <returns></returns> protected override bool Execute(string name, CefV8Value obj, CefV8Value[] arguments, out CefV8Value returnValue, out string exception) { returnValue = CefV8Value.CreateNull(); exception = null; if (CallBack != null) { CallBack(name, obj, arguments, out returnValue, out exception); } return true; } #endregion 事件 #region 方法 /// <summary> /// 重复叠加字符串 /// </summary> /// <param name=”str”>字符串</param> /// <param name=”n”>次数</param> /// <returns></returns> public string Repeat(string str, int n) { string result = String.Empty; for (int i = 0; i < n; i++) { result += str; } return result; } /// <summary> /// 无返回值 /// </summary> public void EchoVoid() { MessageBox.Show(“BindingTestAv8Handler : EchoVoid()”); } /// <summary> /// 返回逻辑型 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Boolean EchoBoolean(Boolean arg0) { return arg0; } /// <summary> /// 返回可空逻辑型 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Boolean? EchoNullableBoolean(Boolean? arg0) { return arg0; } /// <summary> /// 返回 8 位有符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public SByte EchoSByte(SByte arg0) { return arg0; } /// <summary> /// 返回可空 8 位有符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public SByte? EchoNullableSByte(SByte? arg0) { return arg0; } /// <summary> /// 返回 16 位有符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Int16 EchoInt16(Int16 arg0) { return arg0; } /// <summary> /// 返回可空 16 位有符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Int16? EchoNullableInt16(Int16? arg0) { return arg0; } /// <summary> /// 返回 32 位有符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Int32 EchoInt32(Int32 arg0) { return arg0; } /// <summary> /// 返回可空 32 位有符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Int32? EchoNullableInt32(Int32? arg0) { return arg0; } /// <summary> /// 返回 64 位有符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Int64 EchoInt64(Int64 arg0) { return arg0; } /// <summary> /// 返回可空 64 位有符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Int64? EchoNullableInt64(Int64? arg0) { return arg0; } /// <summary> /// 返回 8 位无符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Byte EchoByte(Byte arg0) { return arg0; } /// <summary> /// 返回可空 8 位无符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Byte? EchoNullableByte(Byte? arg0) { return arg0; } /// <summary> /// 返回 16 位无符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public UInt16 EchoUInt16(UInt16 arg0) { return arg0; } /// <summary> /// 返回可空 16 位无符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public UInt16? EchoNullableUInt16(UInt16? arg0) { return arg0; } /// <summary> /// 返回 32 位无符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public UInt32 EchoUInt32(UInt32 arg0) { return arg0; } /// <summary> /// 返回可空 32 位无符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public UInt32? EchoNullableUInt32(UInt32? arg0) { return arg0; } /// <summary> /// 返回 64 位无符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public UInt64 EchoUInt64(UInt64 arg0) { return arg0; } /// <summary> /// 返回可空 64 位无符号整数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public UInt64? EchoNullableUInt64(UInt64? arg0) { return arg0; } /// <summary> /// 返回单精度浮点数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Single EchoSingle(Single arg0) { return arg0; } /// <summary> /// 返回可空单精度浮点数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Single? EchoNullableSingle(Single? arg0) { return arg0; } /// <summary> /// 返回双精度浮点数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Double EchoDouble(Double arg0) { return arg0; } /// <summary> /// 返回可空双精度浮点数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Double? EchoNullableDouble(Double? arg0) { return arg0; } /// <summary> /// 返回Unicode字符 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Char EchoChar(Char arg0) { return arg0; } /// <summary> /// 返回可空Unicode字符 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Char? EchoNullableChar(Char? arg0) { return arg0; } /// <summary> /// 返回时间类型 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public DateTime EchoDateTime(DateTime arg0) { return arg0; } /// <summary> /// 返回可空时间类型 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public DateTime? EchoNullableDateTime(DateTime? arg0) { return arg0; } /// <summary> /// 返回十进制数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Decimal EchoDecimal(Decimal arg0) { return arg0; } /// <summary> /// 返回可空十进制数 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public Decimal? EchoNullableDecimal(Decimal? arg0) { return arg0; } /// <summary> /// 返回字符串 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public String EchoString(String arg0) { return arg0; } /// <summary> /// 转为小写 /// </summary> /// <param name=”arg0″>参数</param> /// <returns></returns> public String LowercaseMethod(String arg0) { String result = String.Empty; if (arg0 != null) { result = arg0.ToLower(); } MessageBox.Show(“BindingTestAv8Handler : ” + result); return result; } #endregion 方法 } 2.3 评价总结： 优势： (1)、与方法一相比，这个的优势在于不需要在类内部（ExampleBv8Handler），写操作代码。因为有些操作必须在外面编写的，通过回调可以解决这个问题。 弊端： (1)、弊端与方法一类似，很不灵活； |
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来自： TT_TYG > 《CEF 开源浏览器》
