XML的创建、解析-C语言

#include <stdio.h>
#include <libxml/parser.h>
#include <libxml/tree.h>

int main()
{    
    xmlChar *result = NULL;
    int size = 0;
    xmlDocPtr doc = xmlNewDoc(BAD_CAST "1.0");  //定义文档和节点指针
 
    xmlNodePtr root_node = xmlNewNode(NULL,BAD_CAST "root");    
    xmlDocSetRootElement(doc,root_node);        //设置根节点
    
    //在根节点中直接创建节点
    xmlNewTextChild(root_node, NULL, BAD_CAST "newNode1", BAD_CAST "newNode1 content");
    xmlNewTextChild(root_node, NULL, BAD_CAST "newNode2", BAD_CAST "newNode2 content");
    xmlNewTextChild(root_node, NULL, BAD_CAST "newNode3", BAD_CAST "newNode3 content");
    
    //创建一个节点，设置其内容和属性，然后加入根结点
    xmlNodePtr node    = xmlNewNode(NULL,BAD_CAST "node2");
    xmlNodePtr content = xmlNewText(BAD_CAST "NODE CONTENT");
    xmlAddChild(root_node,node);
    xmlAddChild(node,content);
    xmlNewProp(node,BAD_CAST "attribute",BAD_CAST "yes");
    
    //创建一个儿子和孙子节点
    node = xmlNewNode(NULL, BAD_CAST "son");
    xmlAddChild(root_node,node);
    xmlNodePtr grandson = xmlNewNode(NULL, BAD_CAST "grandson");
    xmlAddChild(node,grandson);
    //xmlAddChild(grandson, xmlNewText(BAD_CAST "This is a grandson node"));
    xmlNodePtr congson = xmlNewNode(NULL, BAD_CAST "congson");
    xmlAddChild(grandson,congson);
    
    //存储xml文档
    //xmlKeepBlanksDefault(0);
    //xmlDocDumpFormatMemoryEnc(doc, &result, &size, "UTF-8", 1);

    int nRel = xmlSaveFile("CreateXml.xml",doc);
    if (nRel != -1)
    {
        printf("一个xml文档被创建，写入%d个字节\n", nRel);
    }
    //释放文档内节点动态申请的内存
    xmlFreeDoc(doc);
    return 1;
}

#include <stdio.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
 
int main(int argc, char* argv[])
{
    xmlDocPtr doc;           //定义解析文件指针
    xmlNodePtr curNode;      //定义结点指针
    xmlChar *szKey;          //临时字符串变量
    char *szDocName;
    if (argc <= 1) {
        printf("Usage: %s docname", argv[0]);
        return(0);
    }
    szDocName = argv[1];
    doc = xmlReadFile(szDocName,"GB2312",XML_PARSE_RECOVER);
    //解析文件
    //检查解析文档是否成功，如果不成功，libxml将报错并停止解析。
    //一个常见错误是不适当的编码，XML标准文档除了用UTF-8或UTF-16外还可用其它编码保存
    if (NULL == doc) {
        fprintf(stderr,"Document not parsed successfully.");
        return -1;
    }
    //获取根节点
    curNode = xmlDocGetRootElement(doc);
    if (NULL == curNode) {
        fprintf(stderr,"empty document");
        xmlFreeDoc(doc);
        return -1;
    }
    //确认根元素名字是否符合
    if (xmlStrcmp(curNode->name, BAD_CAST "root")) {
        fprintf(stderr,"document of the wrong type, root node != root");
        xmlFreeDoc(doc);
        return -1;
    }
    curNode = curNode->xmlChildrenNode;
    xmlNodePtr propNodePtr = curNode;
    while(curNode != NULL) {
        //取出节点中的内容
        if ((!xmlStrcmp(curNode->name, (const xmlChar *) "newNode1"))) {
            szKey = xmlNodeGetContent(curNode);
            printf("newNode1: %s\n", szKey);
            xmlFree(szKey);
        }
        //查找带有属性attribute的节点
        if (xmlHasProp(curNode,BAD_CAST "attribute")) {
            propNodePtr = curNode;
        }
        curNode = curNode->next;
    }
 
    //查找属性
    xmlAttrPtr attrPtr = propNodePtr->properties;
    while (attrPtr != NULL) {
        if (!xmlStrcmp(attrPtr->name, BAD_CAST "attribute")) {
            xmlChar* szAttr = xmlGetProp(propNodePtr,BAD_CAST "attribute");
            printf("get attribute=%s\n", szAttr) ;
            xmlFree(szAttr);
        }
        attrPtr = attrPtr->next;
    }
    xmlFreeDoc(doc);
    return 0;
}