在C#中使用licurl来实现HTTP访问

1、文章来源： HYPERLINK /1000.html 冷寒生学习笔记在C#中使用licurl来实现HTTP访问无论写什么程序，怎么少得了网络编程，以前为了实现一个程序中的采集功能，花了N多时间去学习socket,虽然对socket的三次握手能熟练运用。但最终仍以失败告终，主要是因为无法解决高频率进行socket连接时连接失败的问题，这个问题困扰了我二年左右。以前玩儿Linux的时候就用过curl这个开源程序，但当时只知道用curl来下载文件，却不知道可以在自己的程序中也能使用curl,这就是下面要说到的libcurl。本来有一个的开源程序，但自己用VC比用C#熟悉，所以就直接在VC中实现GET

2、/HEAD/POST这三个方法，然后生成DLL，再在C#中写个类来调用。 HYPERLINK /wp-content/uploads/2011/06/http.zip VC编写的libcurl动态链接库下载地址下面是在C#中学的调用类： HYPERLINK /27.html 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57

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5、8 219 220 221 222 223 224 225 226 227 228 229 230 231 using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices; using System.Text.RegularExpressions; namespace zhidao class WinHttp private string m_url, m_referer, m_cookie, m_proxy, m_source, m_postdata

6、, m_accept, m_acceptlanguage, m_contenttype, m_useragent, m_head, m_location; private int m_port, m_statecode; public string Url protected getreturn m_url; setm_url = value; public string Referer protected get return m_referer; set m_referer = value; public string Cookie get return m_cookie; set m_c

7、ookie = value; public string Proxy protected get return m_proxy; set m_proxy = value; private string Source get return m_source; set m_source = value; public string PostData protected get return m_postdata; set m_postdata = value; public string Accept protected get return m_accept; set m_accept = va

8、lue; public string AcceptLanguage protected get return m_acceptlanguage; set m_acceptlanguage = value; public string ContentType protected get return m_contenttype; set m_contenttype = value; public string UserAgent protected get return m_useragent; set m_useragent = value; public string Head get re

9、turn m_head; protected set m_head = value; public string Location get return m_location; protected set m_location = value; public int Port protected get return m_port; set m_port = value; public int StateCode get return m_statecode; protected set m_statecode = value; /GET请求 DllImport(http.dll) priva

10、te static extern int get_url(StringBuilder url, StringBuilder referer, StringBuilder cookie, StringBuilder proxy, int proxy_port, StringBuilder source, int nsrc ); /HEAD请求 DllImport(http.dll) private static extern int get_head(StringBuilder url, StringBuilder referer, StringBuilder cookie, StringBui

11、lder proxy, int proxy_port, StringBuilder source, int nsrc); /POST请求 DllImport(http.dll) private static extern int post_url(StringBuilder url, StringBuilder referer, StringBuilder cookie, StringBuilder post_data, StringBuilder proxy, int proxy_port, StringBuilder source, int nsrc); /提取HTTP头中的各项数据 pr

12、ivate void HttpInfo() /从源码中提取HTTP头 int nPos = m_source.IndexOf(rnrn); if ( nPos = -1 ) return; m_head = m_source.Substring( 0, nPos ); /提取状态码 m_statecode = Convert.ToInt32( m_head.Substring( 9, 3 ) ); if ( m_statecode = 302 ) nPos = m_head.IndexOf( Location: ); if ( nPos != -1 ) m_location = m_head.

13、Substring( nPos, m_head.Length - nPos ); m_location = m_location.Substring( 0, m_location.IndexOf( rn ) ); /网页正文 nPos = m_source.IndexOf( rnrn ); m_source = m_source.Substring( nPos + 4, m_source.Length - nPos - 4); /提取Cookie string arr_tmp = Regex.Split(m_head, rn, RegexOptions.IgnoreCase); int ind

14、ex = 0; foreach ( string str_line in arr_tmp ) if (str_line.IndexOf(Set-Cookie: ) != -1) if (index != 0) m_cookie += ; ; string tmp = Set-Cookie: ; m_cookie += str_line.Substring( tmp.Length, str_line.Length - tmp.Length); index+; public string Get() StringBuilder HtmlSource = new StringBuilder(); H

15、tmlSource.Capacity = 204800; if (get_url( new StringBuilder(m_url), new StringBuilder(m_referer), new StringBuilder(m_cookie), new StringBuilder(m_proxy), m_port, HtmlSource, 204800) = 1) Source = HtmlSource.ToString(); /*提取Http头中的各项数据*/ HttpInfo(); return Source; public string GetHead() StringBuild

16、er HtmlSource = new StringBuilder(); HtmlSource.Capacity = 10240; if (get_head( new StringBuilder(m_url), new StringBuilder(m_referer), new StringBuilder(m_cookie), new StringBuilder(m_proxy), m_port, HtmlSource, 10240) = 1) Source = HtmlSource.ToString(); /*提取Http头中的各项数据*/ HttpInfo(); return Head; public string Post() StringBuilder HtmlSource = new StringBuilder(); HtmlSource.Capacity = 204800; if (post_url( new StringBuilder(m_url), new StringBuilder(m_referer), new StringBuilder(m_cookie), new StringB