一、以rapidxml::node_declaration形式写xml文件第一行

 1 int write(void)
 2 {
 3     int ret = 0;
 4 
 5     rapidxml::xml_document<> doc;
 6     rapidxml::xml_node<> *declear = doc.allocate_node(rapidxml::node_declaration);
 7     declear->append_attribute(doc.allocate_attribute("version", "1.0"));
 8     declear->append_attribute(doc.allocate_attribute("encoding", "utf-8"));
 9     doc.append_node(declear);
10 
11     rapidxml::xml_node<> *p_root_comment = doc.allocate_node(rapidxml::node_comment, NULL, "根节点注释");
12     doc.append_node(p_root_comment);
13 
14     rapidxml::xml_node<> *p_root = doc.allocate_node(rapidxml::node_element, "Root");
15     doc.append_node(p_root);
16 
17     p_root->append_node(doc.allocate_node(rapidxml::node_comment, NULL, "信息"));
18     rapidxml::xml_node<> *p_one_node = doc.allocate_node(rapidxml::node_element, "Information");
19     p_one_node->append_node(doc.allocate_node(rapidxml::node_comment, NULL, "姓名"));
20     p_one_node->append_node(doc.allocate_node(rapidxml::node_element, "Name", "Toney"));
21     p_one_node->append_node(doc.allocate_node(rapidxml::node_comment, NULL, "年龄"));
22     p_one_node->append_node(doc.allocate_node(rapidxml::node_element, "Age", "23"));
23     p_one_node->append_node(doc.allocate_node(rapidxml::node_comment, NULL, "身份ID"));
24     p_one_node->append_node(doc.allocate_node(rapidxml::node_element, "ID", "5132232323423"));
25     p_root->append_node(p_one_node);
26 
27     p_root->append_node(doc.allocate_node(rapidxml::node_comment, NULL, "成绩"));
28     rapidxml::xml_node<> *p_second_node = doc.allocate_node(rapidxml::node_element, "Score");
29     p_second_node->append_node(doc.allocate_node(rapidxml::node_comment, NULL, "语文"));
30     p_second_node->append_node(doc.allocate_node(rapidxml::node_element, "语文", "89"));
31     p_second_node->append_node(doc.allocate_node(rapidxml::node_comment, NULL, "数学"));
32     p_second_node->append_node(doc.allocate_node(rapidxml::node_element, "数学", "97"));
33     p_second_node->append_node(doc.allocate_node(rapidxml::node_comment, NULL, "英语"));
34     p_second_node->append_node(doc.allocate_node(rapidxml::node_element, "英语", "89"));
35     p_root->append_node(p_second_node);
36 
37     std::string str_text;
38     str_text.clear();
39     rapidxml::print(std::back_inserter(str_text), doc);
40     doc.clear();
41 
42     std::ofstream out("testInfor.xml");
43     out << str_text;
44 
45     std::cout << str_text.c_str() << std::endl;
46 
47     system("pause");
48 
49     return ret;
50 }

运行结果：