用C++.NET创建XML文档（用正则表达式和字符串类两种方法匹配）

前一阵子搞java，可是SUN提供的帮助文档没有搜索功能，只提供了27个索引页，即26个字母开头和以‘_’开头的类或函数 ，所以想给它加个搜索功能，为此用C++.NET建了个XML文档用来查找，主要有两个关键字，<key>是要搜索的类或函数，<detail>是包括链接信息的简要说明。如下图所示：



源程序如下：

#using <system.dll>
#using <mscorlib.dll>
#using <system.xml.dll>
#using <system.drawing.dll>
#using <system.windows.forms.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Windows::Forms;
using namespace System::Text::RegularExpressions;
int main(){
String^ filename;
String^ content;
String^ key;
String^ detail;
String^ word1=L"(?<=<DT>)([A]|[^A])*?(?=<?DT>)";
String^ word2=L"(?<=<B>)([A]|[^A])*?(?=</B>)";
System::Text::Encoding^ temp=System::Text::Encoding::GetEncoding("gb2312");
// XmlDocument^ temp=gcnew XmlDocument();
array<Byte>^btemp=gcnew array<Byte>(word1->Length);
btemp=temp->GetBytes(word1);
Regex^ elementexp=gcnew Regex(temp->GetString(btemp));
array<Byte>^btemp1=gcnew array<Byte>(word2->Length);
btemp1=temp->GetBytes(word2);
Regex^ keyexp=gcnew Regex(temp->GetString(btemp1));
for(int i=1;i<=27;i++){
//MessageBox::Show(L"OK",L"success",MessageBoxButtons::OK,MessageBoxIcon::Information);
filename=String::Concat(L"D://Program Files//Apache Software Foundation//Tomcat 5.5//webapps//api//index-files//index-",i.ToString(),L".html");
FileStream^ fileStream=gcnew FileStream(filename,FileMode::OpenOrCreate,FileAccess::Read);
array<Byte>^b=gcnew array<Byte>(fileStream->Length);
fileStream->Read(b,0,b->Length);
System::Text::Encoding^ gb=System::Text::Encoding::GetEncoding("gb2312");
content=gb->GetString(b);
XmlDocument^ document=gcnew XmlDocument();
XmlElement^ element;
XmlElement^ root;
XmlElement^ keyele;
XmlElement^ detailele;
XmlNode^ xmlNode;
XmlText^ keytext;
XmlText^ detailtext;
//Console::Write(content);
xmlNode=document->CreateNode(XmlNodeType::XmlDeclaration,L"",L"");
document->AppendChild(xmlNode);

root=document->CreateElement(L"",L"javaapi",L"");

Match^ eleMatch=nullptr;
Match^ keyMatch=nullptr;
int index1=content->IndexOf(L"<DL>");
MatchCollection^ elematches=elementexp->Matches(content);
for(int j=0;j<elematches->Count;j++){
/*while(index1<content->Length){
index1=content->IndexOf(L"<DT>",index1+4);
int index2=content->IndexOf(L"<DT>",index1+4);
int index5=index2;
if(index2==-1)index2=content->IndexOf(L"</DL>");
detail=content->Substring(index1,index2-index1);
int index3=detail->IndexOf(L"<B>");
int index4=detail->IndexOf(L"</B>");
key=detail->Substring(index3+3,index4-index3-3);*/
eleMatch=elematches[j];
detail=eleMatch->ToString();
keyMatch=keyexp->Matches(detail)[0];
key=keyMatch->ToString();
//MessageBox::Show(key,L"success",MessageBoxButtons::OK,MessageBoxIcon::Information);

element=document->CreateElement(L"",L"element",L"");
keyele=document->CreateElement(L"",L"key",L"");
keytext=document->CreateTextNode(key);
keyele->AppendChild(keytext);
element->AppendChild(keyele);

detailele=document->CreateElement(L"",L"detail",L"");
detailtext=document->CreateTextNode(detail);
detailele->AppendChild(detailtext);
element->AppendChild(detailele);
root->AppendChild(element);
//if(index5==-1)break;
//Console::WriteLine(index1);
}

MessageBox::Show(L"OK",L"success",MessageBoxButtons::OK,MessageBoxIcon::Information);
document->AppendChild(root);
String^ savename=String::Concat(L"java",i.ToString(),L".xml");
XmlTextWriter^ writer=gcnew XmlTextWriter(savename,System::Text::Encoding::UTF8);
document->WriteTo(writer);
writer->Close();
}
return 0;
}

绿色的代码使用正则表达式匹配，红色的代码使用String类匹配

得到的XML文档如下所示：