Ubuntu C語言 使用 libxml2庫讀寫XML文件

參考自

http://www.codeweblog.com/linux%E4%B8%8B%E4%BD%BF%E7%94%A8libxml2%E5%BA%93%E8%AF%BB%E5%86%99xml%E6%96%87%E4%BB%B6/

但是在下載 libxml2-2.6.30.tar.gz 之后安裝編譯的時候 發現 問題：

 

 

In function 'open',
inlined from 'xmlNanoHTTPSave__internal_alias' at nanohttp.c:1588:12:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:50:4: error: call to '__open_missing_mode' declared with attribute error: open with O_CREAT or O_TMPFILE in second argument needs 3 arguments
__open_missing_mode ();
^
Makefile:853: recipe for target 'nanohttp.lo' failed
make[2]: *** [nanohttp.lo] Error 1
make[2]: Leaving directory '/home/hongzhunzhun/work/software/xml/libxml2-2.6.30'
Makefile:1017: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/hongzhunzhun/work/software/xml/libxml2-2.6.30'
Makefile:560: recipe for target 'all' failed
make: *** [all] Error 2

 

 

 

 

下載新版本   libxml2-2.6.30.tar.gz   

 

 http://linux.softpedia.com/get/Programming/Libraries/libxml2-162.shtml#download

 

./configure

make

sudo make install

 

 

新建一個xml文件夾

mkdir xml

 

新建一個xml 文件:List.xml

<?xml version="1.0"?>
<List>

<Person Id="1001" Name="Tsybius" Sex="Male" Age="23">
    <Achievement>ABC Rank 2

    </Achievement>

    <Achievement>

    DEF Rank 4

    </Achievement>
</Person>


<Person Id="1002" Name="Galatea" Sex="Female" Age="21">

    <Achievement>ABC Rank 1</Achievement>

    <Achievement>XYZ Rank 2</Achievement>

    <Achievement>MNOP Rank 5 </Achievement>

</Person>
</List>

　　

 

 

 

a.c

#include<stdio.h>

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

int main()
{
    //建立XML文檔和根結點
    xmlDocPtr doc = xmlNewDoc(BAD_CAST"1.0");
    xmlNodePtr root = xmlNewNode(NULL, BAD_CAST"List");

    //將根節點綁定到XML文檔
    xmlDocSetRootElement(doc, root);

    //建立Person結點，為其安裝四個屬性
    xmlNodePtr nodeTsybius = xmlNewNode(NULL, BAD_CAST"Person");
    xmlNewProp(nodeTsybius, BAD_CAST"Id", BAD_CAST"1001");
    xmlNewProp(nodeTsybius, BAD_CAST"Name", BAD_CAST"Tsybius");
    xmlNewProp(nodeTsybius, BAD_CAST"Sex", BAD_CAST"Male");
    xmlNewProp(nodeTsybius, BAD_CAST"Age", BAD_CAST"23");
    xmlAddChild(root, nodeTsybius);

    //在Person結點下安放子結點，並為子節點添加內容
    xmlNewTextChild(nodeTsybius, NULL, BAD_CAST"Achievement", BAD_CAST"ABC Rank 2");
    xmlNewTextChild(nodeTsybius, NULL, BAD_CAST"Achievement", BAD_CAST"DEF Rank 4");

    xmlNodePtr nodeGalatea = xmlNewNode(NULL, BAD_CAST"Person");
    xmlNewProp(nodeGalatea, BAD_CAST"Id", BAD_CAST"1002");
    xmlNewProp(nodeGalatea, BAD_CAST"Name", BAD_CAST"Galatea");
    xmlNewProp(nodeGalatea, BAD_CAST"Sex", BAD_CAST"Female");
    xmlNewProp(nodeGalatea, BAD_CAST"Age", BAD_CAST"21");
    xmlAddChild(root, nodeGalatea);

    xmlNewTextChild(nodeGalatea, NULL, BAD_CAST"Achievement", BAD_CAST"ABC Rank 1");
    xmlNewTextChild(nodeGalatea, NULL, BAD_CAST"Achievement", BAD_CAST"XYZ Rank 2");
    xmlNewTextChild(nodeGalatea, NULL, BAD_CAST"Achievement", BAD_CAST"MNOP Rank 5");

    //保存XML文檔
    int nRel = xmlSaveFile("List.xml", doc);
    if(nRel != -1)
    {
        printf("List.xml: Created Successfully!\n");
    }

    //釋放資源
    xmlFreeDoc(doc);
    xmlCleanupParser();

    return 0;
}

 

b.c

#include<stdio.h>
#include<stdlib.h>

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

#define spc(level) PrintSpace(level)

//輸出縮進用的空格（4個）
void PrintSpace(int level)
{
    for(int counter = 0; counter < level; counter++)
    {
        printf("    ");
    }
}

//主函數
int main()
{
    //打開XML文件
    xmlDocPtr doc = xmlParseFile("List.xml");
    if(doc == NULL)
    {
        printf("Error: Can not open List.xml\n");
        exit(1);
    }

    //找到首結點
    xmlNodePtr root = xmlDocGetRootElement(doc);
    if(root == NULL)
    {
        printf("Error: Can not find the root!\n");
        exit(1);
    }

    xmlNodePtr person; //Person結點指針
    xmlNodePtr achivm; //Achievement結點指針

    //遍歷一個Person結點
    spc(0); printf("Name: %s\n", root -> name);

    person = root -> children;

    //逐個找出屬性
    spc(1); printf("Node: %s\n", person -> name);
    spc(2); printf("Id: %s\n", xmlGetProp(person, BAD_CAST "Id"));
    spc(2); printf("Name: %s\n", xmlGetProp(person, BAD_CAST "Name"));
    spc(2); printf("Sex: %s\n", xmlGetProp(person, BAD_CAST "Sex"));
    spc(2); printf("Age: %s\n", xmlGetProp(person, BAD_CAST "Age"));

    //用循環遍歷子節點，打印內容
    for(achivm = person -> children; achivm; achivm = achivm -> next)
    {
        spc(3);
        printf("Node: %s\t", achivm -> name);
        printf("Content: %s\t", (char*)xmlNodeGetContent(achivm));
        printf("End\n");
    }

    spc(1); printf("End\n");

    //一個Person結點遍歷結束
    //轉到下一個Person結點
    person = person -> next;

    //查看某屬性是否與某字符串相等
    if(xmlStrcmp(xmlGetProp(person, BAD_CAST "Name"), (const xmlChar*)"Galate"))
    {
        spc(1); printf(">> The next person is Galatea!\n");
    }
    else
    {
        spc(1); printf(">> The next person is not Galatea!\n");
    }

    //查看某結點是否有某屬性
    if(xmlHasProp(person, BAD_CAST "Height"))
    {
        spc(1); printf(">> The node person has attribute: Height!\n");
    }
    else
    {
        spc(1); printf(">> The next person does not have attribute: Height!\n");
    }

    //修改屬性（Attribute）
    xmlSetProp(person, (const xmlChar*)"Age", (const xmlChar*)"22");
    spc(1); printf(">> Change Galatea's age from 21 to 22!\n");

    //修改子結點中的內容（Content）
    xmlNodeSetContent(person -> children, (const xmlChar*) "NEW Rank 1");
    spc(1); printf(">> Change Galatea's 1st achievement to NEW Rank 1\n");

    //打印修改后的person結點
    spc(1); printf("Node: %s\n", person -> name);
    spc(2); printf("Id: %s\n", xmlGetProp(person, BAD_CAST "Id"));
    spc(2); printf("Name: %s\n", xmlGetProp(person, BAD_CAST "Name"));
    spc(2); printf("Sex: %s\n", xmlGetProp(person, BAD_CAST "Sex"));
    spc(2); printf("Age: %s\n", xmlGetProp(person, BAD_CAST "Age"));     

    for(achivm = person -> children; achivm; achivm = achivm -> next)
    {
        spc(3);
        printf("Node: %s\t", achivm -> name);
        printf("Content: %s\t", (char*)xmlNodeGetContent(achivm));
        printf("End\n");
    }

    spc(1); printf("End\n");

    spc(0); printf("End\n");

    xmlFree(achivm);
    xmlFree(person);
    xmlFree(root);
    xmlFree(doc);
    xmlCleanupParser();

    return 0;
}

 

make.sh

#!/bin/sh

echo compiling...

gcc a.c -I/usr/local/include/libxml2 -L/usr/local/lib -lxml2 -o a
gcc b.c -I/usr/local/include/libxml2 -L/usr/local/lib -lxml2 -o b

echo run a...
./a
cat List.xml

echo run b...
./b

exit 0

　　

sh make.sh