Ubuntu下libxml2的安裝和使用
阿新 • • 發佈:2019-02-15
這篇文章主要介紹libxml2的安裝和使用,xml檔案的主要作用就是配置檔案,實際的應用在前面的章節Audio裝置檔案解析中有需要對audio_policy_configuration.xml檔案解析,google使用的是開源庫libxml2,在原始碼目錄/external/libxml2下面,現在就單獨對這個庫進行分析。
在終端中執行
[email protected]:~/test$ sudo apt-get install libxml2-dev
[email protected]:~/test$ sudo apt-get install libxml2
可以通過
[email protected] :~/test$ dpkg -s libxml2-dev
檢視安裝狀況。
通過執行Package: libxml2-dev Status: install ok installed Priority: optional Section: libdevel Installed-Size: 2862 Maintainer: Ubuntu Developers <[email protected]> Architecture: amd64 Multi-Arch: same Source: libxml2 Version: 2.9.1+dfsg1-3ubuntu4.12 Depends: libxml2 (= 2.9.1+dfsg1-3ubuntu4.12) Suggests: pkg-config Description: Development files for the GNOME XML library XML is a metalanguage to let you design your own markup language. A regular markup language defines a way to describe information in a certain class of documents (eg HTML). XML lets you define your own customized markup languages for many classes of document. It can do this because it's written in SGML, the international standard metalanguage for markup languages. . Install this package if you wish to develop your own programs using the GNOME XML library. Homepage: http://xmlsoft.org/
[email protected]:~/test$ dpkg -L libxml2-dev
檢視安裝位置
/usr/include/libxml2
/usr/include/libxml2/libxml
/usr/include/libxml2/libxml/xpointer.h
/usr/include/libxml2/libxml/catalog.h
/usr/include/libxml2/libxml/xmlreader.h
/usr/include/libxml2/libxml/xmlexports.h
已經安裝成功。
接下來寫個demo使用libxml2進行檔案解析,編寫CreateXmlFile.c
編譯#include<stdio.h> #include<libxml/parser.h> #include<libxml/tree.h> int main(int argc, char **argv) { //Define document pointer xmlDocPtr doc = xmlNewDoc(BAD_CAST"1.0"); //Define node pointer xmlNodePtr root_node = xmlNewNode(NULL,BAD_CAST"root"); //Set the root element of the document xmlDocSetRootElement(doc,root_node); //Create child nodes directly in the root node xmlNewTextChild(root_node,NULL,BAD_CAST"newnode1",BAD_CAST"newnode1 content"); xmlNewTextChild(root_node,NULL,BAD_CAST"newnode2",BAD_CAST"newnode2 content"); //Create a new node xmlNodePtr node = xmlNewNode(NULL,BAD_CAST"node2"); //Create a new text node xmlNodePtr content = xmlNewText(BAD_CAST"NODE CONTENT"); //Add a new node to parent xmlAddChild(root_node,node); xmlAddChild(node,content); //Create a new property carried by a node xmlNewProp(node,BAD_CAST"attribute",BAD_CAST"yes"); //Create a son and grandson node element 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")); //Dump an XML document to a file int nRel = xmlSaveFile("CreatedXmlDemo.xml",doc); if(nRel != -1) { //Free up all the structures used by a document,tree included xmlFreeDoc(doc); } return 0; }
[email protected]:~/test$ gcc -I/usr/include/libxml2 CreateXmlFile.c -o CreateXmlFile -lxml2
可以看到執行結果
[email protected]:~/test$ gcc -I/usr/include/libxml2 CreateXmlFile.c -o CreateXmlFile -lxml2
[email protected]:~/test$ ./CreateXmlFile
[email protected]:~/test& ls
CreatedXmlDemo.xml CreateXmlFile
使用html開啟生成的檔案
可以看到生成的檔案和程式碼描述的相同,程式執行正確。如果需要使用cmake構建工程,請檢視 CMake加入第三方庫介紹。
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