c++编写xml操作类（添加关于多种编码的支持）

       今天上网具体看了下关于编码格式的资料，想自己的xml解析程序一直都只支持ansi，那么我们就现学现用，让它支持Unicode和utf8编码吧。

xml.h:

#include <iostream> #include <string> #include <vector> #include "windows.h" #include "wininet.h" using namespace std; #pragma comment(lib,"wininet.lib") class xml; class nodecollect; class node{ public: string getattr(string); node* setattr(string,string); node* appned(node *); node* removechild(int); node* insert(int,node*); node *getnext(); node *getparent(); node *getprevious(); node *getchild(int); nodecollect *getnodebyname(string); int getcount(); string gettag(); string gettype(); node* removeattr(string); void remove(); int gettotlecount(); string gettext(); node *puttext(string); nodecollect *selectnodes(string); nodecollect *select(string); private: friend class xml; int count; node *child; node *next; node *parent; string data; string tag; string type; xml *x; }; class nodecollect{ public: nodecollect(); int getcount(); node *item(int); void push(node*); private: int count; vector<node*> v; }; class xml{ public: xml(); ~xml(); void loadstring(string); void scan(string); void out(string&,node *); node *getchild(int); nodecollect *getnodebyname(string); int getcount(); node *createnode(string); node *createtextnode(string); void loadfile(string); void savefile(string,int =ansi); void flush(); string gettext(); node *insertpi(); xml* append(node *); nodecollect *selectnodes(string); nodecollect *select(string,nodecollect * =0,node * =0); void loadurl(string); wstring UTF8ToUnicode( const string& );string UnicodeToANSI( const wstring& ) ;enum {ansi=1,unicode=2,utf8=3};private: friend class node; node* root; int count; string text; void output(node *,string&); };

xml.cpp:

#include "xml.h"xml::xml(){ root=0; count=0; } xml::~xml(){ } wstring xml::UTF8ToUnicode( const string& str ) { int len = str.length(); int unicodeLen = ::MultiByteToWideChar( CP_UTF8, 0, str.c_str(), -1, NULL, 0 ); wchar_t * pUnicode; pUnicode = new wchar_t[unicodeLen+1]; memset(pUnicode,0,(unicodeLen+1)*sizeof(wchar_t)); MultiByteToWideChar( CP_UTF8, 0, str.c_str(), -1, (LPWSTR)pUnicode, unicodeLen ); wstring rt = ( wchar_t* )pUnicode; delete pUnicode; return rt; } string xml::UnicodeToANSI( const wstring& str ) { char* pElementText; int iTextLen; // wide char to multi char iTextLen = WideCharToMultiByte( CP_ACP, 0, str.c_str(), -1, NULL, 0, NULL, NULL ); pElementText = new char[iTextLen + 1]; memset( ( void* )pElementText, 0, sizeof( char ) * ( iTextLen + 1 ) ); WideCharToMultiByte( CP_ACP, 0, str.c_str(), -1, pElementText, iTextLen, NULL, NULL ); string strText = pElementText; delete[] pElementText; return strText; } void xml::loadstring(string s){ scan(s); } void xml::loadurl(string s){HINTERNET ie=InternetOpen("sx",INTERNET_OPEN_TYPE_PRECONFIG,0,0,0); HINTERNET ieo=InternetOpenUrl(ie,s.data(),0,0,INTERNET_FLAG_RELOAD,0); DWORD read=0; char b[100]={0};InternetReadFile(ieo,b,98,&read); if(b[0]=='/xff' && b[1]=='/xfe'){wstring s1;s1=(wchar_t*)(b+2);while(1){ memset(b,0,100); InternetReadFile(ieo,b,98,&read); if(read==0){ break; } s1+=(wchar_t*)b;} text=UnicodeToANSI(s1);}else if(b[0]=='/xef' && b[1]=='/xbb' && b[2]=='/xbf'){text=(b+3);while(1){ memset(b,0,100);InternetReadFile(ieo,b,99,&read); if(read==0){ break; } text+=b; } text=UnicodeToANSI(UTF8ToUnicode(text));}else{text=b;while(1){ memset(b,0,100);InternetReadFile(ieo,b,99,&read); if(read==0){ break; } text+=b; } }loadstring(text); InternetCloseHandle(ieo); InternetCloseHandle(ie);}void xml::scan(string s){ int i=0; node *p=0; while(1){ if(i==s.length()){ break; } if(s[i]=='<' && s[i+1]!='/'){ node *n=new node; count++; n->next=0; n->child=0; n->count=0; n->x=this; n->type="node"; if(s[i+1]=='!'){n->type="cdata";} if(p){ n->parent=p; n->parent->count++; node *n1=p->child; if(n1){ while(n1->next){ n1=n1->next; } n1->next=n; }else{ p->child=n; } }else{ n->parent=0; if(!root){ root=n; }else{ node* n1=root; while(n1->next){ n1=n1->next; } n1->next=n; } } i++; while(s[i]!='>'){ if(s[i]!='/') n->data.append(1,s[i]); i++; } int index=n->data.find(' '); n->tag=n->data.substr(0,index!=-1?index:n->data.find('>')); if(s[i-1]!='/' && s[i-1]!='?' && s[i-1]!=']'){ p=n; } }else if(s[i]=='<' && s[i+1]=='/'){ if(p->parent){ p=p->parent; }else{ p=0; } while(s[i]!='>'){ char t=s[i]; i++; } }else if(s[i]!='/t' && s[i]!=' ' && s[i]!='/r' && s[i]!='/n'){ node *n=new node; count++; n->next=0; n->child=0; n->count=0; n->parent=p; n->x=this; n->type="text"; n->parent->count++; node *n1=p->child; if(n1){ while(n1->next){ n1=n1->next; } n1->next=n; }else{ p->child=n; } while(s[i]!='<'){ n->data.append(1,s[i]); i++; } for(int i1=n->data.length()-1;i1>=0;i1--){ if(n->data[i1]!='/t' && n->data[i1]!=' ' && n->data[i1]!='/r' && n->data[i1]!='/n'){ break; }else{ n->data.erase(i1,1); } } continue; } i++; } } void xml::out(string& s,node *n=0){ if(!n){node *r=root;while(r){output(r,s); s+="/r/n";r=r->next;}}else{output(n,s);}} void xml::output(node * n,string& s){ node *n1=n; int tab=0;if(n1->gettype()=="text"){s=s+n1->data;return;}else if(n1->child){s=s+"<"+n1->data+">"+"/r/n"; }else if(n1->gettag()=="?xml"){s=s+"<"+n1->data+">"; return;}else{s=s+"<"+n1->data+"/>"; return;} while(1){ if(n1->child){ n1=n1->child; tab++; for(int i1=0;i1<tab;i1++){ s=s+"/t"; } if(n1->type=="text"){ s=s+n1->data+"/r/n"; }else if(n1->gettype()=="cdata"){s=s+"<"+n1->data+">/r/n"; }else{ if(n1->count>0){ s=s+"<"+n1->data+">"+"/r/n"; }else{ s=s+"<"+n1->data+"/>"+"/r/n"; } } }else if(n1->next && n1!=n){ if(n1->count>0){ for(int i2=0;i2<tab;i2++){ s=s+"/t"; } s=s+"</"+n1->tag+">"+"/r/n"; } n1=n1->next; for(int i1=0;i1<tab;i1++){ s=s+"/t"; } if(n1->type=="text"){ s=s+n1->data+"/r/n"; }else if(n1->gettype()=="cdata"){s=s+"<"+n1->data+">/r/n"; }else{ if(n1->count>0){ s=s+"<"+n1->data+">"+"/r/n"; }else{ s=s+"<"+n1->data+"/>"+"/r/n"; } } }else{ //s=s+"</"+n1->tag+">"+"/r/n"; node *n2=n1->parent,*n3=0; if(n2 && n2!=n){ while(n2->next==0){ tab--; for(int i1=0;i1<tab;i1++){ s=s+"/t"; } s=s+"</"+n2->tag+">"+"/r/n"; n3=n2; n2=n2->parent; if(n2==n){ tab--; for(int i1=0;i1<tab;i1++){ s=s+"/t"; } s=s+"</"+n->tag+">"; goto a; } } tab--; for(int i1=0;i1<tab;i1++){ s=s+"/t"; } s=s+"</"+n2->tag+">"+"/r/n"; n1=n2->next; for(int i2=0;i2<tab;i2++){ s=s+"/t"; } if(n1->count>0){ s=s+"<"+n1->data+">"+"/r/n"; }else{ s=s+"<"+n1->data+"/>"+"/r/n"; } }else{ s=s+"</"+n->tag+">"; a: break; } } } } nodecollect *xml::selectnodes(string s){nodecollect *nc=new nodecollect;int i=0;if(s[i]=='/' && s[i+1]=='/'){int index=s.find('/',i+2);string s1;if(index!=-1){s1=s.substr(2,index-2);}else{s1=s.substr(2);}int i1=0;while(getchild(i1)){node *n=getchild(i1);if(n->gettag()==s1){if(index==-1){nc->push(n);}else if(s[index+1]=='/'){string s2=s.substr(index+2);for(int i2=0;i2<n->gettotlecount();i2++){if(n->getchild(i2)->gettag()==s2){nc->push(n->getchild(i2));}}}else{node *n1=n->child;string s2=s.substr(index+1);while(n1){if(n1->gettag()==s2){nc->push(n1);}n1=n1->next;}}}i1++;}}else{int index=s.find('/',i+1);string s1;if(index!=-1){s1=s.substr(1,index-1);}else{s1=s.substr(1);}node *nn=root;while(nn){node *n=nn;if(n->gettag()==s1){if(index==-1){nc->push(n);}else if(s[index+1]=='/'){string s2=s.substr(index+2);for(int i2=0;i2<n->gettotlecount();i2++){if(n->getchild(i2)->gettag()==s2){nc->push(n->getchild(i2));}}}else{node *n1=n->child;string s2=s.substr(index+1);while(n1){if(n1->gettag()==s2){nc->push(n1);}n1=n1->next;}}}nn=nn->next;}}return nc;}nodecollect *xml::select(string s,nodecollect *nc,node *n){if(!nc){nc=new nodecollect;}if(s[1]=='/'){int index=s.find('/',2);if(index==-1){string data=s.substr(2);int attr=data.find('[');if(attr!=-1){string tag,k,v;tag=data.substr(0,attr);int i1=attr+1;while(data[i1]!='='){k.append(1,data[i1]);i1++;}i1++;while(data[i1]!=']'){v.append(1,data[i1]);i1++;}if(n){int l=n->gettotlecount();for(int i2=0;i2<l;i2++){node *n1=n->getchild(i2);if(n1->gettag()==tag && n1->getattr(k)==v){nc->push(n1);}}return nc;}else{n=root;while(n){if(n->gettag()==tag && n->getattr(k)==v){nc->push(n);}select(s,nc,n);n=n->next;}return nc;}}else{string tag=data;if(n){int l=n->gettotlecount();for(int i2=0;i2<l;i2++){node *n1=n->getchild(i2);if(n1->gettag()==tag){nc->push(n1);}}return nc;}else{n=root;while(n){if(n->gettag()==tag){nc->push(n);}select(s,nc,n);n=n->next;}return nc;}}}else{string data=s.substr(2,index-2);string next=s.substr(index);int attr=data.find('[');if(attr!=-1){string tag,k,v;tag=data.substr(0,attr);int i1=attr+1;while(data[i1]!='='){k.append(1,data[i1]);i1++;}i1++;while(data[i1]!=']'){v.append(1,data[i1]);i1++;}if(n){int l=n->gettotlecount();for(int i2=0;i2<l;i2++){node *n1=n->getchild(i2);if(n1->gettag()==tag && n1->getattr(k)==v){select(next,nc,n1);}}return nc;}else{n=root;while(n){if(n->gettag()==tag && n->getattr(k)==v){select(next,nc,n);}for(int i=0;i<n->gettotlecount();i++){if(n->getchild(i)->gettag()==tag && n->getchild(i)->getattr(k)==v){select(next,nc,n->getchild(i));}}n=n->next;}}}else{string tag=data;if(n){int l=n->gettotlecount();for(int i2=0;i2<l;i2++){node *n1=n->getchild(i2);if(n1->gettag()==tag){select(next,nc,n1);}}return nc;}else{n=root;while(n){if(n->gettag()==tag){select(next,nc,n);}for(int i=0;i<n->gettotlecount();i++){if(n->getchild(i)->gettag()==tag){select(next,nc,n->getchild(i));}}n=n->next;}}}}}else{int index=s.find('/',1);if(index==-1){string data=s.substr(1);int attr=data.find('[');if(attr!=-1){string tag,k,v;tag=data.substr(0,attr);int i1=attr+1;while(data[i1]!='='){k.append(1,data[i1]);i1++;}i1++;while(data[i1]!=']'){v.append(1,data[i1]);i1++;}if(n){node *n1=n->child;while(n1){if(n1->gettag()==tag && n1->getattr(k)==v){nc->push(n1);}n1=n1->next;}return nc;}else{n=root;while(n){if(n->gettag()==tag && n->getattr(k)==v){nc->push(n);}n=n->next;}return nc;}}else{string tag=data;if(n){node *n1=n->child;while(n1){if(n1->gettag()==tag){nc->push(n1);}n1=n1->next;}return nc;}else{n=root;while(n){if(n->gettag()==tag){nc->push(n);}n=n->next;}return nc;}}}else{string data=s.substr(1,index-1);string next=s.substr(index);int attr=data.find('[');if(attr!=-1){string tag,k,v;tag=data.substr(0,attr);int i1=attr+1;while(data[i1]!='='){k.append(1,data[i1]);i1++;}i1++;while(data[i1]!=']'){v.append(1,data[i1]);i1++;}if(n){node *n1=n->child;while(n1){if(n1->gettag()==tag && n1->getattr(k)==v){select(next,nc,n1);}n1=n1->next;}return nc;}else{n=root;while(n){if(n->gettag()==tag && n->getattr(k)==v){select(next,nc,n);}n=n->next;}}}else{string tag=data;if(n){node *n1=n->child;while(n1){if(n1->gettag()==tag){select(next,nc,n1);}n1=n1->next;}return nc;}else{n=root;while(n){if(n->gettag()==tag){select(next,nc,n);}n=n->next;}}}}}return nc;}int xml::getcount(){return count;}node *xml::getchild(int i){int i1=0;node *n=root;while(i1!=i){if(!n){return 0;}if(n->child){n=n->child;}else{if(n->next){n=n->next;}else{while(n->parent && n->parent->next==0){n=n->parent;}if(n->parent){n=n->parent->next;}else{return 0;}}}i1++;}return n;}nodecollect *xml::getnodebyname(string s){node *n1=root;nodecollect *nc=new nodecollect;if(n1->tag==s){nc->push(n1);} while(1){ if(n1->child){ n1=n1->child; if(n1->tag==s){nc->push(n1);} }else if(n1->next){ n1=n1->next; if(n1->tag==s){nc->push(n1);} }else{ //cout<<"</"<<n1->tag<<">"<<endl; node *n2=n1->parent,*n3=0; if(n2){ while(n2->next==0){ n3=n2; n2=n2->parent; if(n2==0){ goto a; } } n1=n2->next; if(n1->tag==s){nc->push(n1);} }else{ // cout<<"</"<<n1->tag<<">"<<endl; a: break; } } } return nc;}node *xml::createnode(string s){node *n=new node;n->x=this;n->child=0;n->count=0;n->next=0;n->parent=0;n->type="node";n->tag=s;n->data=s;return n;}node *xml::createtextnode(string s){node *n=new node;n->x=this;n->child=0;n->count=0;n->next=0;n->parent=0;n->type="text";n->data=s;return n;}void xml::loadfile(string s){FILE *f=fopen(s.data(),"rb");char buf[2048]={0};fread(buf,1,2040,f);if(buf[0]=='/xff' && buf[1]=='/xfe'){wstring s1;s1=(wchar_t*)(buf+2);while(!feof(f)){memset(buf,0,2048);fread(buf,1,2046,f);s1=s1+(wchar_t*)buf;}text=UnicodeToANSI(s1);}else if(buf[0]=='/xef' && buf[1]=='/xbb' && buf[2]=='/xbf'){text=(buf+3);while(!feof(f)){memset(buf,0,2048);fread(buf,1,2047,f);text=text+buf;}text=UnicodeToANSI(UTF8ToUnicode(text));}else{text=buf;while(!feof(f)){memset(buf,0,2048);fread(buf,1,2047,f);text+=buf;}}fclose(f);loadstring(text);}void xml::savefile(string s,int mode){flush();FILE *f=fopen(s.data(),"wb");if(mode==ansi){fwrite(text.data(),1,text.length(),f);}else if(mode==unicode){fwrite("/xff/xfe",1,2,f);int wcsLen = ::MultiByteToWideChar(CP_ACP, NULL, text.data(), text.length(), NULL, 0);//分配空间要给'/0'留个空间，MultiByteToWideChar不会给'/0'空间wchar_t* wszString = new wchar_t[wcsLen + 1];//转换::MultiByteToWideChar(CP_ACP, NULL, text.data(), text.length(), wszString, wcsLen);//最后加上'/0'wszString[wcsLen] = '/0';fwrite(wszString,2,wcsLen,f);delete []wszString;}else if(mode==utf8){fwrite("/xef/xbb/xbf",1,3,f);int wcsLen = ::MultiByteToWideChar(CP_ACP, NULL, text.data(), text.length(), NULL, 0);//分配空间要给'/0'留个空间，MultiByteToWideChar不会给'/0'空间wchar_t* wszString = new wchar_t[wcsLen + 1];//转换::MultiByteToWideChar(CP_ACP, NULL, text.data(), text.length(), wszString, wcsLen);//最后加上'/0'wszString[wcsLen] = '/0'; int Len = ::WideCharToMultiByte( CP_UTF8, 0, wszString, -1, NULL, 0 ,0,0); char * p; p = new char[Len+1]; memset(p,0,(Len+1)*sizeof(char)); WideCharToMultiByte( CP_UTF8, 0, wszString, -1, p, Len,0,0); string s2 =p; delete p; fwrite(s2.data(),1,s2.length(),f);delete []wszString;}fclose(f);}void xml::flush(){text="";string s;node *r=root;while(r){output(r,s);text+=s;s="";text+="/r/n";r=r->next;}//scan(text);}string xml::gettext(){return text;}node *xml::insertpi(){node * n=createnode("?xml");n->setattr("version","1.0");n->data+="?";n->next=root;root=n;count++;return n;}xml* xml::append(node *n){if(root){node *n1=root;while(n1->next){n1=n1->next;}n1->next=n;}else{root=n;}count+=n->gettotlecount()+1;return this;}nodecollect::nodecollect(){count=0;}int nodecollect::getcount(){return count;}node *nodecollect::item(int i){return v[i];}void nodecollect::push(node* n){v.push_back(n);count++;}node* node::appned(node *n){if(child){node *n1=child;while(n1->next){n1=n1->next;}n1->next=n;count++;n->parent=this;x->count+=n->gettotlecount()+1;}else{child=n;count++;n->parent=this;x->count+=n->gettotlecount()+1;}return this;}node* node::insert(int i,node *n){if(i==0){n->next=child;n->parent=this;count++;child=n;}else if(i==count){appned(n);}else{node *n1=child,*n2=0;int i1=0;while(i1!=i){n2=n1;n1=n1->next;i1++;}n2->next=n;n->next=n1;count++;n->parent=this;}return this;}node* node::removechild(int i){if(i==0){node *n=child;child=child->next;count--;x->count=x->count-gettotlecount()-1;delete n;}else{node *n=child,*n1=0;int i1=0;while(i1!=i){n1=n;n=n->next;i1++;}n1->next=n->next;count--;x->count=x->count-gettotlecount()-1;delete n;}return this;}string node::getattr(string s){string ss;char *i=strstr(data.data(),s.data());c:if(i && (*(i-1)==' ' || *(i-1)=='/r' || *(i-1)=='/n' || *(i-1)=='/t') && (*(i+s.length())==' ' || *(i+s.length())=='=')){char *i1=strstr(i+1,"/"");char *i2=strstr(i1+1,"/"");i1++;while(i1!=i2){ss+=*i1;i1++;}}else{if(i==0){return ss;}else{i=strstr(i+1,s.data());goto c;}}return ss;}node* node::setattr(string k,string v){char *i=strstr(data.data(),k.data());c:if(i && (*(i-1)==' ' || *(i-1)=='/r' || *(i-1)=='/n' || *(i-1)=='/t') && (*(i+k.length())==' ' || *(i+k.length())=='=')){char *i1=strstr(i+1,"/"");char *i2=strstr(i1+1,"/"");string d=i2;data=data.substr(0,i1-data.data()+1);data+=v;data+=d;}else{if(i==0){if(data.substr(data.length()-1,1)!="?"){data=data+' '+k+"="+'/"'+v+'/"';}else{data=data.substr(0,data.length()-1)+' '+k+"="+'/"'+v+"/"?";}}else{i=strstr(i+1,k.data());goto c;}}return this;}node* node::removeattr(string s){char *i=strstr(data.data(),s.data());c:if(i && (*(i-1)==' ' || *(i-1)=='/r' || *(i-1)=='/n' || *(i-1)=='/t') && (*(i+s.length())==' ' || *(i+s.length())=='=')){char *i1=strstr(i+1,"/"");char *i2=strstr(i1+1,"/"");string d=i2+1;data=data.substr(0,i-data.data()-1);data+=d;}else{if(i==0){return this;}else{i=strstr(i+1,s.data());goto c;}}return this;}void node::remove(){node *n=getparent();if(n){node *n1=getprevious();if(n1){n1->next=next;}else{n->child=next;}n->count--;x->count=x->count-gettotlecount()-1;}else{node *n1=getprevious();if(n1){n1->next=next;}else{x->root=x->root->next;}x->count=x->count-gettotlecount()-1;}delete this;}node *node::getchild(int i){int i1=-1;node *n=this;while(i1!=i){if(n->child){n=n->child;}else{if(n->next){n=n->next;}else{while(n->parent && n->parent->next==0 && n->parent!=this){n=n->parent;}if(n->parent!=this){n=n->parent->next;}else{return 0;}}}i1++;}return n;}nodecollect *node::getnodebyname(string s){node *n1=this->child;nodecollect *nc=new nodecollect;if(n1->tag==s){nc->push(n1);} while(1){ if(n1->child){ n1=n1->child; if(n1->tag==s){nc->push(n1);} }else if(n1->next){ n1=n1->next; if(n1->tag==s){nc->push(n1);} }else{ //cout<<"</"<<n1->tag<<">"<<endl; node *n2=n1->parent,*n3=0; if(n2 && n2!=this){ while(n2->next==0){ n3=n2; n2=n2->parent; if(n2==this){ goto a; } } n1=n2->next; if(n1->tag==s){nc->push(n1);} }else{ // cout<<"</"<<n1->tag<<">"<<endl; a: break; } } } return nc;}int node::getcount(){return count;}node *node::getnext(){return next;}node *node::getparent(){return parent;}node *node::getprevious(){if(parent){node *n=parent->child;while(n && n->next!=this){n=n->next;}return n;}else{node *n=x->getchild(0);while(n && n->next!=this){n=n->next;}return n;}return 0;}string node::gettag(){return tag;}string node::gettype(){return type;}int node::gettotlecount(){int i1=0;node *n=this->child;if(n)i1++;while(n){if(n->child){n=n->child;}else{if(n->next){n=n->next;}else{while(n->parent && n->parent->next==0 && n->parent!=this){n=n->parent;}if(n->parent!=this){n=n->parent->next;}else{break;}}}i1++;}return i1;}string node::gettext(){string s;for(int i=0;i<gettotlecount();i++){if(getchild(i)->gettype()=="text"){s+=getchild(i)->data;}}return s;}node *node::puttext(string s){if(child && child->gettype()=="text"){child->remove();}node *n=x->createtextnode(s);insert(0,n);return this;}nodecollect *node::selectnodes(string s){nodecollect *nc=new nodecollect;int i=0;if(s[i]=='/' && s[i+1]=='/'){int index=s.find('/',i+2);string s1;if(index!=-1){s1=s.substr(2,index-2);}else{s1=s.substr(2);}int i1=0;while(getchild(i1)){node *n=getchild(i1);if(n->gettag()==s1){if(index==-1){nc->push(n);}else if(s[index+1]=='/'){string s2=s.substr(index+2);for(int i2=0;i2<n->gettotlecount();i2++){if(n->getchild(i2)->gettag()==s2){nc->push(n->getchild(i2));}}}else{node *n1=n->child;string s2=s.substr(index+1);while(n1){if(n1->gettag()==s2){nc->push(n1);}n1=n1->next;}}}i1++;}}else{int index=s.find('/',i+1);string s1;if(index!=-1){s1=s.substr(1,index-1);}else{s1=s.substr(1);}node *nn=child;while(nn){node *n=nn;if(n->gettag()==s1){if(index==-1){nc->push(n);}else if(s[index+1]=='/'){string s2=s.substr(index+2);for(int i2=0;i2<n->gettotlecount();i2++){if(n->getchild(i2)->gettag()==s2){nc->push(n->getchild(i2));}}}else{node *n1=n->child;string s2=s.substr(index+1);while(n1){if(n1->gettag()==s2){nc->push(n1);}n1=n1->next;}}}nn=nn->next;}}return nc;}nodecollect *node::select(string s){return x->select(s,0,this);}

       关于编码的知识，大家可以上网查查，添加后打开文件会自动识别ansi，Unicode和utf8这三种编码，并讲后两种编码统一转化成ansi方便操作，在savefile保存文件时可以指定编码保存。下面给出个实例：

main(){
xml x;
x.loadurl("file://c://aa.xml");
cout<<x.getchild(0)->getattr("SoundEffect");
x.savefile("c://111.xml",xml::ansi);
}

       本文有不足之处，还望大家多多指教。