读XML中KeyValue

来源：互联网发布：nginx 502错误编辑：程序博客网时间：2024/05/24 03:42

这是一个类，直接调用就可以了。

class common_tool{public:common_tool(void);~common_tool(void);std::string read_config(const char* filename, const char* parent_start,const char* parent_end,const char* child_start,const char* child_end);/*判断在一个字符串里面是否存在查找的字符串key 查找字符串*/const bool exist_parent_key(const char* source,const char* key);/*得到2个字符串中间的值*/std::string get_value_between(const char* source,  const char* keyname_start,  const char* keyname_end);};

CPP

#include <iostream>#include <fstream>#include <string>#include "common_tool.h"using namespace std;common_tool::common_tool(void){}common_tool::~common_tool(void){}std::string common_tool::read_config(const char* filename,    const char* parent_start,   const char* parent_end,   const char* child_start,   const char* child_end){string strEmptyString="";ifstream file(filename,ios::in);      if (!file.is_open())      {          return strEmptyString;      }      string line_string="";      string document_txt="";      int pos=-1;  string keyname_parent_start = parent_start; string keyname_parent_end =parent_end;string keyname_child_start = child_start;string keyname_child_end = child_end;string keyvalue = "";bool find_parent_start =false;bool find_parent_end =false;bool find_parent =false;    while(getline(file,line_string))      {//find start of parent keynameif(false == find_parent){    find_parent_start = exist_parent_key(line_string.c_str(),keyname_parent_start.c_str());   if(true == find_parent_start){find_parent = true;}}// find end of parent keynamefind_parent_end = exist_parent_key(line_string.c_str(),keyname_parent_end.c_str());if(true == find_parent_end){find_parent = false;break;}//find keyvalue by keyname what you want in parent keyname.if(true == find_parent){keyvalue="";keyvalue.append(get_value_between(line_string.c_str(),            keyname_child_start.c_str(),keyname_child_end.c_str()));if(keyvalue.length()>0){break;}}    }      file.close();      return keyvalue;  }const bool common_tool::exist_parent_key(const char* source,const char* key){bool rs = false;string keyname = key;string line = source;int pos = 0;pos=line.find(key,0);if(pos<0){rs = false;}else{rs = true;}return rs;}std::string common_tool::get_value_between(const char* source,                          const char* keyname_start,  const char* keyname_end){bool rs = false;string str_source = source;string keyvalue = "";static const char* str_empty_value = "";int pos_start = 0;int pos_end = 0;int len = 0;len = str_source.length();if(len<=0){return str_empty_value;}pos_start = str_source.find(keyname_start,0);pos_end   = str_source.find(keyname_end,0);if(pos_start<0 || pos_end <0){return str_empty_value; // can not find!}int pos_keyvalue_start = pos_start + strlen(keyname_start);int len_keyvalue = pos_end - pos_keyvalue_start;//len - pos_keyvalue_start - strlen(keyname_end);if(len_keyvalue<=0){return str_empty_value;}keyvalue = str_source.substr(pos_keyvalue_start,len_keyvalue);    return keyvalue;  }

完。

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