请问提取字符串的有关问题

2012-02-09

请教提取字符串的问题我想在一个HTML中提取一段字符HTML结构如下：!DOCTYPEHTMLPUBLIC-//IETF//DTDHTML//

请教提取字符串的问题
我想在一个HTML中提取一段字符 HTML结构如下：
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN ">
<HTML>
<HEAD>
<meta name= "GENERATOR " content= "Microsoft® HTML Help Workshop 4.1 ">

</HEAD> <BODY>
<UL>
<LI> <OBJECT type= "text/sitemap ">
<param name= "Name " value= "Robst ">
<param name= "Name " value= "CopyRight ">
<param name= "Local " value= "Introduction\CopyRight.htm ">
<param name= "Name " value= "FAQ ">
<param name= "Local " value= "FAQ\FAQ.htm ">
<param name= "Name " value= "Welcome to Robst ">
<param name= "Local " value= "Welcome\welcome.htm ">
<param name= "URL " value= "Introduction\KnowRobst.htm ">
<param name= "Name " value= "Known BlueSoleil ">
</OBJECT>
<LI> <OBJECT type= "text/sitemap ">
<param name= "Name " value= "Dial-Up Networking ">
<param name= "Name " value= "Mobile ">
<param name= "Local " value= "Connection\Mobile\Mobile.htm ">
</OBJECT>
<LI> <OBJECT type= "text/sitemap ">
<param name= "Name " value= "Environment ">
<param name= "Local " value= "Welcome\welcome.htm ">
</OBJECT>
.................
我想提取每一个 <LI> <OBJECT type= "text/sitemap ">
之后第一行的value的值，引号中的字符串。就是 <param name= "Name " value= "Robst "> 中我提取出 Robst，并写入新文件中，其他行不管，直到下一个 <LI> <OBJECT type= "text/sitemap "> 。

请问该如何做啊我对字符操作不是很熟，请各位帮帮忙吧谢谢！！

[解决办法]
去学“正则表达式”
[解决办法]
那就用string类的find吧，自己看看string类的帮助。
[解决办法]
"text/sitemap "> \s.*value= "(.*)[^ "] " //貌似可以
boss 真傻
[解决办法]
我也够傻上边错了是这个。
"text/sitemap "> \s.*value= "[^ "](.*) "
[解决办法]
不能用正则那就手动解析吧。

test.txt文件内容：
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN ">
<HTML>
<HEAD>
<meta name= "GENERATOR " content= "Microsoft® HTML Help Workshop 4.1 ">

</HEAD> <BODY>
<UL>
<LI> <OBJECT type= "text/sitemap ">
<param name= "Name " value= "Robst ">
<param name= "Name " value= "CopyRight ">
<param name= "Local " value= "Introduction\CopyRight.htm ">

</OBJECT>
<LI> <OBJECT type= "text/sitemap ">
<param name= "Name " value= "Dial-Up Networking ">
<param name= "Name " value= "Mobile ">
<param name= "Local " value= "Connection\Mobile\Mobile.htm ">
</OBJECT>

#include <fstream>
//#include <string>
#include <iostream>
#include <cstdlib>

using namespace std;

int main()
{
string line, value;
int flag=0;
ifstream infile( "test.txt ");
while(!infile.eof())
{
getline(infile, line);
if(line == " </OBJECT> ")
flag=0;
if(flag)
{
value=line.substr(line.find( "value ")+7); //截取 value= " 后面的string
value=value.substr(0, value.length()-2); //去除后面 ">
cout < <value < <endl; //输出结果，这个结果也可以另外处理，比如写到其他文件
}
if(line == " <LI> <OBJECT type=\ "text/sitemap\ "> ")
flag=1;
}

system( "pause ");
return 0;
}

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请问提取字符串的有关问题