学习C#中调用COM，后期绑定（以及对WinHttpCOM对象的C#封装）

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学习C#中调用COM，后期绑定全部代码开始学习C#了，没打算从语法一点一点的看起！所以上来就直接开始代码了！同时也和Delphi之间的某些操作进行比较比较！于是想到了一个朋友用 Delphi写的通过ip138查询手机号码的例子，他用的是IdHttp来进行提交操作的。我在之前写飞信的控件的时候，用的http是Windows 自己内部的COM库：WinHttp.WinHttpRequest.5.1，这个玩意用起来还是相当方便的，于是就乘着学习，借机来在C#中动态创建这个COM对象。要知道在Delphi中创建和调用一个COM对象，那是相当方便的。直接一个CreateOleObject就能创建一个COM对象了，然后COM对象中的方法就能够直接通过这个东西直接调用。那么在C#中是否依然如此简洁？不晓得，是因为我刚接触还是咋地，折磨了半天，实在没摸索到简单的方法来创建COM对象（当然，那种通过引用添加组件库到C#环境中去的方法不算，因为这个方法有一定的弊端，那便是当用户换了环境，重新来编译本程序的时候，由于新的环境中可能并没有引用这个库，所以直接编译会出错，于是咱们又要重新添加引用一次本库！），唯一的办法就是后期绑定COM对象（至于是否有简单方法，我不知道的，因为才学1天）。查阅了相关的一些资料之后得知，首先要通过COM对象名称获得这个对象在系统全局的一个ProgId，然后通过这个 ProgId获得这个对象的类型：

System.Type _ObjType = System.Type.GetTypeFromProgID(ComName);

然后通过这个类型来创建一个对象接口

object ComInstance= System.Activator.CreateInstance(_ObjType);

之后，对该对象方法的调用都要通过type的InvokeMember方法来进行比如：

return ComType.InvokeMember(MethodName,System.Reflection.BindingFlags.InvokeMethod,null,ComInstance,args);

哎！写起来的代码量还真是有点大呢！于是，产生了一个想法，将这个COM对象后期绑定的玩意封装起来做一个公共的，能省多少代码就省多少代码，尽量的减少代码量：

/*
* Created by SharpDevelop.
* User: Administrator
* Date: 2009-12-2
* Time: 23:26
*
* To change this template use Tools | Options | Coding | Edit Standard Headers.
*/

using System;

namespace DxComOperate
{
    /// <summary>
    /// COM对象的后期绑定调用类库
    /// </summary>
    public class DxComObject
    {
        private System.Type _ObjType;
        private object ComInstance;
        /*public DxComObject()
        {
            throw new
        }*/
        public DxComObject(string ComName)
        {
            //根据COM对象的名称创建COM对象
            _ObjType = System.Type.GetTypeFromProgID(ComName);
            if(_ObjType==null)
                throw new Exception("指定的COM对象名称无效");
            ComInstance = System.Activator.CreateInstance(_ObjType);
        }
        public System.Type ComType
        {
            get{return _ObjType;}
        }
        //执行的函数
        public object DoMethod(string MethodName,object[] args)
        {
            return ComType.InvokeMember(MethodName,System.Reflection.BindingFlags.InvokeMethod,null,ComInstance,args);
        }
        //获得属性与设置属性
        public object this[string propName]
        {
            get
            {
                return _ObjType.InvokeMember( propName, System.Reflection.BindingFlags.GetProperty, null, ComInstance, null );
            }
            set
            {
                _ObjType.InvokeMember( propName, System.Reflection.BindingFlags.SetProperty, null, ComInstance, new object[] {value} );
            }
        }
    }


    /// <summary>
    /// WinHttp对象库
    /// </summary>
    public class DxWinHttp
    {
        private DxComObject HttpObj;
        private string _ContentType;
        public DxWinHttp()
        {
            //构建WinHttp对象
            HttpObj = new DxComObject("WinHttp.WinHttpRequest.5.1");
        }
        //设置Content-Type属性
        public string ContentType
        {
            get{return _ContentType;}
            set
            {
                if (_ContentType.CompareTo(value)!=0)
                {
                    _ContentType = value;
                    object[] args = new object[2];
                    args[0] = "Content-Type";args[1] = value;
                    HttpObj.DoMethod("SetRequestHeader",args);
                }
            }
        }


    }
}

代码写的也不复杂，就这么几句，但是我想应该看起来更加明亮化了。

比如，我现在通过这个封装操作库来通过ip138查询手机号码的归属地

void Button1Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length == 0)
            {
                MessageBox.Show("请输入一个手机号");
                return;
            }
            DxComObject WinHttp = new DxComObject("WinHttp.WinHttpRequest.5.1");
            string PostData = "http://www.ip138.com:8080/search.asp";
            object[] args = new object[3];//指定参数
            args[0] = "GET";args[1] = PostData;args[2] = false;
            WinHttp.DoMethod("Open",args);//执行Open方法
            PostData = "action=mobile&mobile="+this.textBox1.Text;

            args = new object[2];
            args[0] = "Content-Length";args[1] = PostData.Length;
            WinHttp.DoMethod("SetRequestHeader",args);

            args = new object[2];
            args[0] = "Content-Type";args[1] = "application/x-www-form-urlencoded";
            WinHttp.DoMethod("SetRequestHeader",args);

            args = new object[2];
            args[0] = "User-Agent";args[1] = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)";
            WinHttp.DoMethod("SetRequestHeader",args);

            args = new object[1];
            args[0] = PostData;
            WinHttp.DoMethod("Send",args);

            DxComObject AdoStream = new DxComObject("Adodb.Stream");
            AdoStream["Type"] = 1;
            AdoStream["Mode"] = 3;

            args = new object[]{};
            AdoStream.DoMethod("Open",args);

            args = new object[1]{WinHttp["ResponseBody"]};
            AdoStream.DoMethod("Write",args);
            AdoStream["Position"] = 0;
            AdoStream["Type"] = 2;
            AdoStream["Charset"] = "GB2312";
            string Result = AdoStream["ReadText"].ToString();

            Info.mobileNo = GetReturnValue(DxValueType.DxPhone,Result);
            Info.City = GetReturnValue(DxValueType.DxPhoneCity,Result);
            Info.CardType = GetReturnValue(DxValueType.DxCardType,Result);
            Info.CityCode = GetReturnValue(DxValueType.DxCityCode,Result);
            this.propertyGrid1.Refresh();
        }

//可见现在这个代码就已经很明显很明白了，但是写的代码量还是有些大，如果反复使用的话，就不爽了还是要写比较多的代码，于是开始着手对WinHttp这个COM对象进行封装

/// <summary>
    /// WinHttp对象库
    /// </summary>
    public class DxWinHttp
    {
        private DxComObject HttpObj;
        private string _ContentType;
        private int _ContentLength;
        private bool _Active;
        private System.Collections.ArrayList PostDataList;//提交的数据字段
        public DxWinHttp()
        {
            //构建WinHttp对象
            HttpObj = new DxComObject("WinHttp.WinHttpRequest.5.1");
            _ContentType = "application/x-www-form-urlencoded";
            _ContentLength = 0;
            PostDataList = new System.Collections.ArrayList();
        }

        //提交参数信息的个数
        public int PostDataCount
        {
            get{return PostDataList.Count;}
        }
        //设置Content-Type属性
        public string ContentType
        {
            get{return _ContentType;}
            set
            {
                if(!_Active) _ContentType = value;
                else if(_ContentType.CompareTo(value)!=0)
                {
                    _ContentType = value;
                    SetRequestHeader("Content-Type",_ContentType);
                }
            }
        }

        //对象是否是打开状态
        public bool Active
        {
            get{return _Active;}
        }

        //设置Send数据的长度
        public int ContentLength
        {
            get{return _ContentLength;}
            set
            {
                if(!_Active) _ContentLength = value;
                else if(_ContentLength != value)
                {
                    _ContentLength = value;
                    HttpObj.DoMethod("SetRequestHeader",new object[2]{"Content-Length",value});
                }
            }
        }

        //执行之后返回的结果
        public string ResponseBody
        {
            get
            {
                if(_Active)
                {
                    DxComObject AdoStream = new DxComObject("Adodb.Stream");
                    AdoStream["Type"] = 1;
                    AdoStream["Mode"] = 3;
                    AdoStream.DoMethod("Open",new object[]{});
                    AdoStream.DoMethod("Write",new object[1]{HttpObj["ResponseBody"]});
                    AdoStream["Position"] = 0;
                    AdoStream["Type"] = 2;
                    AdoStream["Charset"] = "GB2312";
                    return AdoStream["ReadText"].ToString();
                }
                else return "";
            }
        }

        //设定请求头
        public string SetRequestHeader(string Header,object Value)
        {
            object obj;
            obj = HttpObj.DoMethod("SetRequestHeader",new object[]{Header,Value});
            if(obj != null) return obj.ToString();
            else return "True";
        }

        //打开URL执行OpenMethod方法,Async指定是否采用异步方式调用,异步方式不会阻塞
        public string Open(string OpenMethod,string URL,bool Async)
        {
            object obj;
            obj = HttpObj.DoMethod("Open",new object[]{OpenMethod,URL,Async});
            if (obj != null)
            {
                _Active = false;
                return obj.ToString();
            }
            else
            {
                SetRequestHeader("Content-Type",_ContentType);
                SetRequestHeader("User-Agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)");
                if (_ContentLength != 0) SetRequestHeader("Content-Length",_ContentLength);
                _Active = true;
                return "True";
            }
        }

        //发送数据
        public string Send(string body)
        {
            if(!_Active) return "False";
            object obj;
            obj = HttpObj.DoMethod("Send",new object[1]{body});
            if(obj != null) return obj.ToString();
            else return "True";
        }

        public void ClearPostData()
        {
            this.PostDataList.Clear();
        }
        //增加提交数据信息
        public void AddPostField(string FieldName,object Value)
        {
            this.PostDataList.Add(FieldName+"="+Value.ToString());
        }

        //通过参数指定提交
        public string DxPost()
        {
            if(!_Active)
            {
                return "False";
            }
            string st="";
            for(int i=0;i<this.PostDataList.Count;i++)
            {
                if(st != "") st = st + "&"+ PostDataList[i].ToString();
                else st = PostDataList[i].ToString();
            }
            this.ContentLength = st.Length;
            return Send(st);
        }

        //设置等待超时等
        public string SetTimeouts(long ResolveTimeout,long ConnectTimeout,long SendTimeout,long ReceiveTimeout)
        {
            object obj;
            obj = HttpObj.DoMethod("SetTimeouts",new object[4]{ResolveTimeout,ConnectTimeout,SendTimeout,ReceiveTimeout});
            if(obj != null) return obj.ToString();
            else return "True";
        }
        //等待数据提交完成
        public string WaitForResponse(object Timeout,out bool Succeeded)
        {
            if(!_Active) {Succeeded =