Libxml2使用实例.docx

XML--Libxml2使用实例一，使用Libxml2生成xml 1，编辑生成#include stdio.h#include libxml/parser.h#include libxml/tree.hint main(int argc, char **argv){xmlDocPtr doc = NULL; /* document pointer */xmlNodePtr root_node = NULL, node = NULL, node1 = NULL;/* node pointers */// Creates a new document, a node and set it as a root nodedoc = xmlNewDoc(BAD_CAST 1.0);root_node = xmlNewNode(NULL, BAD_CAST root);xmlDocSetRootElement(doc, root_node);//creates a new node, which is attached as child node of root_node node. xmlNewChild(root_node, NULL, BAD_CAST node1,BAD_CAST content of node1);// xmlNewProp() creates attributes, which is attached to an node.node=xmlNewChild(root_node, NULL, BAD_CAST node3, BAD_CASTnode has attributes);xmlNewProp(node, BAD_CAST attribute, BAD_CAST yes);//Here goes another way to create nodes. node = xmlNewNode(NULL, BAD_CAST node4);node1 = xmlNewText(BAD_CASTother way to create content);xmlAddChild(node, node1);xmlAddChild(root_node, node);//Dumping document to stdio or filexmlSaveFormatFileEnc(argc 1 ? argv[1] : -, doc, UTF-8, 1);/*free the document */xmlFreeDoc(doc);xmlCleanupParser();xmlMemoryDump();//debug memory for regression testsreturn 0;}2，编译运行gcc main.c -o main.out -I /usr/include/libxml2 -lxml23，生成的xml?xml version=1.0 encoding=UTF-8?root node1content of node1/node1 node3 attribute=yesnode has attributes/node3 node4other way to create content/node4/root两个实例，说明如何使用Libxml2遍历xml文档和使Xpath获取特定结点的内容值：程序使用的xml文档如下：?xml version=1.0 encoding=UTF-8?root node1content of node1/node1 node3 attribute=yesnode has attributes/node3 node4other way to create content/node4/root二，遍历程序代1，代码#include stdio.h#include libxml/parser.h#include libxml/tree.hint main(int argc, char** argv){xmlDocPtr doc=NULL;xmlNodePtr cur=NULL;char* name=NULL;char* value=NULL;xmlKeepBlanksDefault (0); if(argc2){ printf(ERROR: argc must be 2 or above.\n); return -1;}//create Dom treedoc=xmlParseFile(argv[1]);if(doc==NULL){ printf(ERROR: Loading xml file failed.\n); exit(1); }// g