Gdataxmlnode create and parse XML

Gdataxmlnode creates XML:

# Import <Foundation/Foundation. h> 2 # import "gdataxmlnode. H "3 4 int main () 5 {6 nserror * error; 7 // create the root node 8 gdataxmlelement * rootelement = [gdataxmlnode elementwithname: @" ABC "]; 9 // create the first subnode 10 gdataxmlelement * element = [gdataxmlnode elementwithname: @ "name" stringvalue: @ ""]; 12 // Add the child node to the root node 13 [rootelement addchild: element]; 14 15 // use the root node to create the XML document 16 gdataxmldocument * rootdoc = [[gdataxmldocument alloc] initwithrootelement: rootelement]; 17 // set the XML version used 18 [rootdoc setversion: @ "1.0"]; 19 // set the character encoding of the XML document 20 [rootdoc setcharacterencoding: @ "UTF-8"]; 21 22 // obtain and print the XML string 23 nsstring * STR = [[nsstring alloc] initwithdata: rootdoc. xmldata encoding: nsutf8stringencoding]; 24 nslog (@ "% @", STR); 25 26 return 0; 27}

 

The compilation command is:

1 clang main.m GDataXMLNode.m -framework Foundation -lxml2 -I /usr/include/libxml2/

Because xml2 is used in gdataxmlnode, remember to connect it and specify the header file search path. You must also remember to use setcharacterencoding to specify the character set.

 

 

Bytes -------------------------------------------------------------------------------------------------------------------------

City. xml

<Province>

<Hebei>

<City> Shijiazhuang </city>

<City> Tangshan </city>

<City> Qinhuangdao </city>

<City> Handan </city>

<City> Xingtai </city>

<City> Baoding </city>

<City> Chengde </city>

<City> Cangzhou </city>

<City> Langfang </city>

<City> Hengshui </city>

</Hebei>

<Henan>

<City> Zhengzhou </city>

<City> Kaifeng </city>

<City> Luoyang </city>

<City> Pingdingshan </city>

<City> Anyang </city>

<City> hebi </city>

<City> Xinxiang </city>

<City> Jiaozuo </city>

<City> Puyang </city>

<City> xuchang </city>

<City> Luohe </city>

<City> Sanmenxia </city>

<City> Nanyang </city>

<City> Shangqiu </city>

<City> Xinyang </city>

<City> Zhoukou </city>

<City> Zhumadian </city>

</Henan>

</Province>

Gdataxmldata parsing XML: 1. Method 1:

-(Void) getdata

{

// A dictionary

Self. DIC = [[nsmutabledictionary alloc] initwithcapacity: 10];

// Obtain the city. XML Path in the package

Nsstring * Path = [[nsbundle mainbundle] pathforresource: @ "city" oftype: @ "XML"];

// Binary data

Nsdata * Data = [[nsdata alloc] initwithcontentsoffile: path];

// Gdataxmldocument starts parsing XML

Gdataxmldocument * Document = [[gdataxmldocument alloc] initwithdata: Data options: 0 error: Nil]

// Obtain the root node

Gdataxmlelement * root = Document. rootelement;

// All subnodes under the root node (excluding the grandson node)

Nsarray * rootson = [root children];

// Traverse the child nodes of the Root Node

For (gdataxmlelement * element in rootson ){

// All cities are put into the dictionary by the province name as the key

Nsmutablearray * ary = [self. DIC objectforkey: element. Name];

If (ary = nil ){

Ary = [[nsmutablearray alloc] initwithcapacity: 20];

[Self. DIC setobject: ary forkey: element. Name];

}

Nsarray * citys = element. Children;

For (gdataxmlelement * city in citys ){

// [Self. DIC setobject: City. stringvalue forkey: City. Name];

[Ary addobject: City. stringvalue];

}

}

}

2. method 2

　　　　

-(Void) getdata1

{

Self. DIC = [[nsmutabledictionary alloc] initwithcapacity: 10];

Nsstring * Path = [[nsbundle mainbundle] pathforresource: @ "city" oftype: @ "XML"];

Nsdata * Data = [[nsdata alloc] initwithcontentsoffile: path];

Gdataxmldocument * Document = [[gdataxmldocument alloc] initwithdata: Data options: 0 error: Nil];

Gdataxmlelement * root = Document. rootelement;

// Parse the following to start this method using nodesforxpath

Nsarray * prov = @ [@ "Henan", @ "Hebei"];

For (INT I = 0; I <[prov count]; I ++)

{

// You can use nodesforxpath to obtain all nodes in the // % @/city format under the root node (root node or root node,

// % @ Is Henan, Hebei, etc. In this format, obtain all city nodes (which can be Sun Tzu nodes). The limit is that the parent node of the city node must be % @

Nsarray * array = [root nodesforxpath: [nsstring stringwithformat: @ "// % @/City", prov [I] error: Nil];

// Obtain all the cities in Henan (or Hebei) and put them in the dictionary with Henan (Hebei) as the key

For (gdataxmlelement * element in array ){

Nsmutablearray * ary = [self. DIC objectforkey: prov [I];

If (ary = nil ){

Ary = [[nsmutablearray alloc] initwithcapacity: 20];

[Self. DIC setobject: ary forkey: prov [I];

}

[Ary addobject: element. stringvalue];

}

}

}

Note:

The elementsforname method can also get the node by name, which is similar to nodesforxpath, but only limited to obtaining the child node.