查找目标字符串中的子串，可识别大小写，大写和小写认为相同

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// ComParaString.cpp : Defines the entry point for the console application.
//

#pragma warning (disable : 4786)
#include "stdafx.h"
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

bool non_case(char c1,char c2)
{
return toupper(c1) == toupper(c2);
}

/********************************************************************
created: 2010/01/22
created: 22:1:2010 11:42
filename: D:/work/20100115/ComParaString/ComParaString.cpp
file path: D:/work/20100115/ComParaString
file base: ComParaString
file ext: cpp
author: Victor

purpose: Srcstr 目标字符串。DstString 源字符串，substring 返回的字符串，可识别大小写字母，认为相同，如果返回值为false substring为，空

*********************************************************************/
bool SubString(string Srcstr,string DstString,string &substring)
{

bool flag = false;

if (Srcstr.size()==DstString.size()&&equal(Srcstr.begin(),Srcstr.end(),DstString.begin(),non_case))
{
  flag = true;

}

for (int i = DstString.size();i>0;i--)

{
  DstString.resize(i);
  string::iterator strop;
  strop = search(Srcstr.begin(),Srcstr.end(),DstString.begin(),DstString.end(),non_case);
  if (strop==Srcstr.end())
  {
   flag = false;
  }
  else
  {
   if (!flag)
   {
    size_t index = strop-Srcstr.begin();
    substring.append(Srcstr,index,DstString.size());
   }

   flag = true;

  }
}
return flag;
}
int main(int argc, char* argv[])
{
char *s = "adddasdfsdfas";
char *s1 = "asdfa";
string strdst;
SubString(s,s1,strdst);
cout<<strdst<<endl;

return 0;
}