标签：clear substr 使用 tin lag data 字符 label file
需要解析一种类xml的数据文件，数据格式如下：
<head> //文件头 <type>xtype</type> <condition> key1=value1 key2=value2 </condition> <mea> key3=value3 key4=value4 </mea> <xxxx>//多个 ... </xxx> </head> <data> //数据域，多个 phi rcs ang 1 2 3 2 3 4 </data> <data> phi rcs ang 3 4 5 4 5 6 </data>
具体代码如下：
#include <string> #include <map> #include <vector> #include <iostream> #include <fstream> #include <sstream> using namespace std; //首先定义表示数据结的构体 typedef struct stMyDataLabel{ string Label; vector<string> Content;//对于head域，content代表label中的内容(非键值对)；对于data域，代表首行数据头（字符串） vector<float> Values;//对应data域中的数据；使用一维数组表示二维数组；二维数组的列数为data域中的Content个数; map<string,string> KeyVal;//head域中解析后的键值对 vector<stMyDataLabel> SubItems;//子标签；标签会嵌套 stMyDataLabel(){ Label = ""; Content.clear(); Values.clear(); KeyVal.clear(); SubItems.clear(); } }stMyDataLabel; class MyDataParse{ public: vector<stMyDataLabel> m_Data;//对应文件中的data域 stMyDataLabel m_Header;//对应文件的head域 char m_StartLabel;//标签开始字符 char m_EndLabel;//标签结束字符 public: MyDataParse(){ m_StartLabel = ‘<‘; m_EndLabel = ‘>‘; } void Init(){//初始化 for (vector<stMyDataLabel>::iterator itr = m_Data.begin();itr!=m_Data.end();itr++) { itr->Content.clear(); itr->Values.clear(); itr->KeyVal.clear(); itr->SubItems.clear(); } m_Header.Content.clear(); m_Header.Values.clear(); m_Header.KeyVal.clear(); m_Header.SubItems.clear(); } //打印解析后的结果 void Print(ostream& myout){ myout<<m_Header.Label<<endl; for (vector<stMyDataLabel>::iterator itr = m_Header.SubItems.begin(); itr != m_Header.SubItems.end(); itr++) { myout<<"\t"<<itr->Label<<"\n"; for (vector<string>::iterator sitr = itr->Content.begin(); sitr != itr->Content.end(); sitr++) { myout<<"\t\t"<<*sitr<<"\t"; } myout<<endl; for (auto mitr = itr->KeyVal.begin(); mitr != itr->KeyVal.end(); mitr++) { myout<<"\t\t"<<mitr->first<<" = "<<mitr->second<<"\t"; } myout<<endl; } for (vector<stMyDataLabel>::iterator ditr = m_Data.begin();ditr!=m_Data.end();ditr++) { myout<<ditr->Label<<endl; for (vector<string>::iterator sitr = ditr->Content.begin(); sitr != ditr->Content.end(); sitr++) { myout<<"\t"<<*sitr<<"\t"; } myout<<endl; int dsize = ditr->Content.size(); int curdidx = 0; for(vector<float>::iterator fitr = ditr->Values.begin(); fitr != ditr->Values.end(); fitr++){ myout<<"\t"<<*fitr<<"\t"; curdidx++; if(curdidx >= dsize){ cout<<endl; curdidx=0; } } myout<<endl; } } bool Parse(char* filename){//读入文件，进行解析 if(filename == NULL) return false; ifstream myin(filename,ios::in); bool flag = ParseLabel(myin,m_Header); if(!flag) return false; while(!myin.eof()){//多个data域 stMyDataLabel data; flag = ParseLabel(myin,data); m_Data.push_back(data); } return flag; } bool ParseLabel(istream& myin,stMyDataLabel& label){//递归解析标签及内部数据 string str; bool flag = true; do{ myin >> str; int sidx=0,eidx=0; sidx = str.find(m_StartLabel); eidx = str.find(m_EndLabel); if(sidx >= 0 && eidx >= 0 && eidx > sidx){//<lable> or </label> if(str.at(sidx+1) != ‘/‘)//start of <label> { //string substr(int pos = 0,int n = npos) const;//返回pos开始的n个字符组组成的新字符串 bool isSub=false; string lableName = str.substr(sidx+1,eidx-sidx-1); if(label.Label != "") isSub = true;//start of subitem‘s <label> //find </label> int sidx2=0,eidx2=0; sidx2 = str.rfind(m_StartLabel); eidx2 = str.rfind(m_EndLabel); if(eidx != eidx2 && str.at(sidx2+1) == ‘/‘)//<label>content</label>, has </label> { string strelab = str.substr(sidx2+2,eidx2-sidx2-2); if(strelab == lableName){ if(isSub){ stMyDataLabel sublabel; sublabel.Label = lableName; sublabel.Content.clear(); sublabel.Content.push_back( str.substr(eidx+1,sidx2-eidx-1) ); label.SubItems.push_back(sublabel); } else{ label.Label = lableName; label.Content.clear(); label.Content.push_back( str.substr(eidx+1,sidx2-eidx-1) ); } continue; } else{ return false; } } else{//处理<label>后换行的情况 if(isSub){ stMyDataLabel sublabel; sublabel.Label = lableName; label.SubItems.push_back(sublabel); int curIdx = label.SubItems.size()-1; bool bres = ParseLabel(myin,label.SubItems.at(curIdx)); if(!bres) return false;//subitem format error else continue;// } else label.Label = lableName; } } else{// </lable>， 标签结束 string elabel = str.substr(sidx+2,eidx-sidx-2); if(elabel == label.Label){//end of this label return true; } else{//format error return false; } } } else{//content if(label.Label == "data" || label.Label == "DATA"){//data block // 判断字符串是不是数字 stringstream sin(str); float val; if(!(sin >> val))//不是数字 label.Content.push_back(str); else label.Values.push_back(val); } else//header { int idx = str.find(‘=‘); if(idx >= 0){//key=value string strkey = str.substr(0,idx); string strval = str.substr(idx+1); label.KeyVal.insert(make_pair(strkey,strval)); } else{ label.Content.push_back(str); } } } }while(flag); } };
测试（命令行方式）
MyDataParse parse; parse.Init(); parse.Parse("test.txt");//数据文件 parse.Print(cout);
标签：clear substr 使用 tin lag data 字符 label file
原文地址：http://www.cnblogs.com/hikeepgoing/p/6287078.html
