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rapidxml create Pascal xml
void CAIExamDlg::create_xml(const SheetDetail & sheet_detail)
{
	rapidxml::xml_document<> doc;
	rapidxml::xml_node<>* rot = doc.allocate_node(rapidxml::node_pi, doc.allocate_string("xml version='1.0' encoding='utf-8'"));
	doc.append_node(rot);
	// annotation 节点
	rapidxml::xml_node<>* node = doc.allocate_node(rapidxml::node_element, "annotation", "information");
	node->append_attribute(doc.allocate_attribute("verified", doc.allocate_string("no")));
	doc.append_node(node);
	// folder 节点
	rapidxml::xml_node<>* node_folder = doc.allocate_node(rapidxml::node_element, "folder", doc.allocate_string(sheet_detail.str_dir_name.c_str()));
	node->append_node(node_folder);
	// filename 节点
	rapidxml::xml_node<>* node_filename = doc.allocate_node(rapidxml::node_element, "filename", doc.allocate_string(sheet_detail.str_img_name.c_str()));
	node->append_node(node_filename);
	// path 节点
	rapidxml::xml_node<>* node_path = doc.allocate_node(rapidxml::node_element, "path", doc.allocate_string(sheet_detail.str_img_path.c_str()));
	node->append_node(node_path);
	// source 节点
	rapidxml::xml_node<>* node_source = doc.allocate_node(rapidxml::node_element, "source",NULL);
	// source 子节点 database 节点
	rapidxml::xml_node<>* node_database = doc.allocate_node(rapidxml::node_element, "database", "Unknown");
	node_source->append_node(node_database);
	node->append_node(node_source);

	// size 节点
	rapidxml::xml_node<>* node_size = doc.allocate_node(rapidxml::node_element, "size", NULL);
	// size 子节点 width height depth 节点
	rapidxml::xml_node<>* node_width = doc.allocate_node(rapidxml::node_element, "width", doc.allocate_string(to_string(sheet_detail.i_img_w).c_str()));
	rapidxml::xml_node<>* node_height = doc.allocate_node(rapidxml::node_element, "height", doc.allocate_string(to_string(sheet_detail.i_img_h).c_str()));
	rapidxml::xml_node<>* node_depth = doc.allocate_node(rapidxml::node_element, "depth", doc.allocate_string(to_string(sheet_detail.i_img_depth).c_str()));
	node_size->append_node(node_width);
	node_size->append_node(node_height);
	node_size->append_node(node_depth);
	node->append_node(node_size);

	// segmented 节点
	rapidxml::xml_node<>* node_segmented = doc.allocate_node(rapidxml::node_element, "segmented", "0");
	node->append_node(node_segmented);
	
	// 循环 多个 object 节点
	for (int i = 0; i < sheet_detail.vec_boundboxes.size(); i++) {
		BoundingBox bbx = sheet_detail.vec_boundboxes[i];
		rapidxml::xml_node<>* node_object = doc.allocate_node(rapidxml::node_element, "object", NULL);
		// 子节点
		rapidxml::xml_node<>* node_name = doc.allocate_node(rapidxml::node_element, "name", doc.allocate_string(bbx.str_class_name.c_str()));
		rapidxml::xml_node<>* node_pos = doc.allocate_node(rapidxml::node_element, "pos", "Unspecified");
		rapidxml::xml_node<>* node_truncated = doc.allocate_node(rapidxml::node_element, "truncated", "0");
		rapidxml::xml_node<>* node_difficult = doc.allocate_node(rapidxml::node_element, "difficult", "0");
		rapidxml::xml_node<>* node_score = doc.allocate_node(rapidxml::node_element, "score", doc.allocate_string(to_string(bbx.score).c_str()));
		// bndbox 节点
		rapidxml::xml_node<>* node_bndbox = doc.allocate_node(rapidxml::node_element, "bndbox", NULL);
		rapidxml::xml_node<>* node_xmin = doc.allocate_node(rapidxml::node_element, "xmin", doc.allocate_string(to_string(bbx.x0).c_str()));
		rapidxml::xml_node<>* node_ymin = doc.allocate_node(rapidxml::node_element, "ymin", doc.allocate_string(to_string(bbx.x1).c_str()));
		rapidxml::xml_node<>* node_xmax = doc.allocate_node(rapidxml::node_element, "xmax", doc.allocate_string(to_string(bbx.y0).c_str()));
		rapidxml::xml_node<>* node_ymax = doc.allocate_node(rapidxml::node_element, "ymax", doc.allocate_string(to_string(bbx.y1).c_str()));
		node_bndbox->append_node(node_xmin);
		node_bndbox->append_node(node_ymin);
		node_bndbox->append_node(node_xmax);
		node_bndbox->append_node(node_ymax);

		// 加入 object 节点
		node_object->append_node(node_name);
		node_object->append_node(node_pos);
		node_object->append_node(node_truncated);
		node_object->append_node(node_difficult);
		node_object->append_node(node_bndbox);
		node_object->append_node(node_score);

		// 加入根节点
		node->append_node(node_object);
		
	}
	
	std::string text;
	rapidxml::print(std::back_inserter(text), doc, 0);
	std::cout << text << std::endl;
	std::ofstream out(sheet_detail.str_xml_path);
	out << doc;

	return;
}
// parse xml

void CAIExamDlg::parse_xml(SheetDetail & sheet_detail)
{
	rapidxml::file<> fdoc(sheet_detail.str_xml_path.c_str());
	rapidxml::xml_document<> doc;
	doc.parse<0>(fdoc.data());
	// 取得根节点
	rapidxml::xml_node<> * node = doc.first_node();// annotation 节点不解析信息 忽略
	// 取得 annotation 节点下面的子节点列表
	node = node->first_node(); 
	string node_name; node_name.clear();
	string node_val; node_val.clear();
	while (node) {
		node_name = node->name();
		if ("size" == node_name) {
			rapidxml::xml_node<> * node_size = node->first_node();
			while (node_size){
				node_name = node_size->name();
				if ("width" == node_name) {
					sheet_detail.i_img_w = atoi(node_size->value());
				}
				else if ("height" == node_name) {
					sheet_detail.i_img_h = atoi(node_size->value());
				}
				else if ("depth" == node_name) {
					sheet_detail.i_img_depth = atoi(node_size->value());
				}
				else
					;
				node_size = node_size->next_sibling();
			}
		}
		else if("object" == node_name){
			BoundingBox bbx;
			rapidxml::xml_node<> * node_obj = node->first_node();
			while (node_obj) {
				node_name = node_obj->name();
				if ("name" == node_name) {
					bbx.str_class_name = node_obj->value();
				}
				else if ("score" == node_name) {
					bbx.score = atof(node_obj->value());
				}
				else if ("bndbox" == node_name) {
					rapidxml::xml_node<> * node_rect = node_obj->first_node();
					while (node_rect) {
						node_name = node_rect->name();
						if ("xmin" == node_name) {
							bbx.x0 = atoi(node_rect->value());
						}
						else if ("ymin" == node_name) {
							bbx.y0 = atoi(node_rect->value());
						}
						else if ("xmax" == node_name) {
							bbx.x1 = atoi(node_rect->value());
						}
						else if ("ymax" == node_name) {
							bbx.y1 = atoi(node_rect->value());
						}
						node_rect = node_rect->next_sibling();
					}
				}
				else
					;
				node_obj = node_obj->next_sibling();
			}
			sheet_detail.vec_boundboxes.push_back(bbx);
		}
		node = node->next_sibling();
	}
}