XMLStreamReader for Objective-C iPhone?

Question

I am using XMLWriter to create xml. Now I want to read this xml with some Reader library / map. Is there an additional library / library for this?

Currently, I want to use the TouchXML library to read it, but it does not work as expected, as it does not support reading a stream.

I want to do something like:

XmlReader pReader = XmlTextReader.Create(pPath); while (pReader.Read()){ switch (pReader.LocalName){ case EXPEL_DEVICES: { //if ((pImportFlags & (int)ExportClass.Devices) != 0) //{ for (pReader.ReadToFollowing(LOCAL_NAME, NAMESPACE_EXPORT); !pReader.EOF && pReader.LocalName == @"NAME"; ) { if (!pReader.ReadToFollowing(DEVICE_ID, NAMESPACE_EXPORT)) throw new AException(DEVICE_ID); NSString *value = pReader.ReadElementContentAsString(); } } break; } } 

Answer 1

After losing my own reputation of 50, I finally used libxml2 and made my XMLStreamReader class as follows: I would like to find this earlier: P. Note that to use this we need to include libxml2.dylib inot in our framework and in build settings add -lxml2 to other linker flags and add /usr/include/libxml2 in the header search path

Header file:

 #import <Foundation/Foundation.h> #import <libxml/xmlreader.h> @interface XMLStreamReader : NSObject { xmlTextReaderPtr xmlReader; } @property (nonatomic, readonly, assign) BOOL eof; @property (nonatomic, readonly, retain) NSString *localName; @property (nonatomic, readonly, assign) xmlElementType nodeType; @property (nonatomic, readonly, assign) BOOL read; @property (nonatomic, readonly, assign) BOOL readElementContentAsBoolean; @property (nonatomic, readonly, retain) NSString *readElementContentAsString; - (void) close; - (id) getAttribute:(NSString *) paramName; - (id) initWithPath:(NSString *) path; @end 

Implementation File:

 #import "XMLStreamReader.h" @implementation XMLStreamReader @dynamic eof; @dynamic localName; @dynamic nodeType; @dynamic read; @dynamic readElementContentAsBoolean; @dynamic readElementContentAsString; - (void) dealloc{ xmlFreeTextReader(xmlReader); [super dealloc]; } /** * xmlTextReaderClose: * @reader: the xmlTextReaderPtr used * * This method releases any resources allocated by the current instance * changes the state to Closed and close any underlying input. * * Returns 0 or -1 in case of error */ - (void) close{ xmlTextReaderClose(xmlReader); } /** * @reader: the xmlTextReaderPtr used * @name: the qualified name of the attribute. * * Provides the value of the attribute with the specified qualified name. * * Returns a string containing the value of the specified attribute, or NULL * in case of error. The string must be deallocated by the caller. */ - (id) getAttribute:(NSString *) paramName{ xmlChar *attribute = xmlTextReaderGetAttribute(xmlReader, (xmlChar *)[paramName UTF8String]); if(attribute != NULL){ NSString *rtString = [NSString stringWithUTF8String:(const char *)attribute]; free(attribute); return rtString; } return NULL; } /** * Checks if, the reader has reached to the end of file * 'EOF' is not used as it is already defined in stdio.h * as '#define EOF (-1)' */ - (BOOL) eof{ return xmlTextReaderReadState(xmlReader) == XML_TEXTREADER_MODE_EOF; } /** * Initializing the xml stream reader with some uri * or local path. */ - (id) initWithPath:(NSString *) path{ if(self = [super init]){ xmlReader = xmlNewTextReaderFilename([path UTF8String]); if(xmlReader == NULL) return nil; } return self; } /** * @reader: the xmlTextReaderPtr used * * The local name of the node. * * Returns the local name or NULL if not available, * if non NULL it need to be freed by the caller. */ - (NSString *) localName{ xmlChar *lclName = xmlTextReaderLocalName(xmlReader); if(lclName != NULL){ NSString *rtString = [NSString stringWithUTF8String:(const char *)lclName]; free(lclName); return rtString; } return NULL; } - (xmlElementType) nodeType{ return xmlTextReaderNodeType(xmlReader); } /** * @reader: the xmlTextReaderPtr used * * Moves the position of the current instance to the next node in * the stream, exposing its properties. * * Returns 1 if the node was read successfully, 0 if there is no more * nodes to read, or -1 in case of error */ - (BOOL) read{ return xmlTextReaderRead(xmlReader); } /** * @reader: the xmlTextReaderPtr used * * Reads the contents of an element or a text node as a Boolean. * * Returns a string containing the contents of the Element or Text node, * or NULL if the reader is positioned on any other type of node. * The string must be deallocated by the caller. */ - (void) readElementContentAsBoolean{ return [[self readElementContentAsString] boolValue]; } /** * @reader: the xmlTextReaderPtr used * * Reads the contents of an element or a text node as a string. * * Returns a string containing the contents of the Element or Text node, * or NULL if the reader is positioned on any other type of node. * The string must be deallocated by the caller. */ - (NSString *) readElementContentAsString{ xmlChar *content = xmlTextReaderReadString(xmlReader); if(content != NULL){ NSString *rtString = [NSString stringWithUTF8String:(const char *)content]; free(content); return rtString; } return NULL; } /** * @reader: the xmlTextReaderPtr used * @localName: the local name of the attribute. * @namespaceURI: the namespace URI of the attribute. * * Moves the position of the current instance to the attribute with the * specified local name and namespace URI. * * Returns 1 in case of success, -1 in case of error, 0 if not found */ - (int) readToFollowing:(NSString *) localname namespace:(NSString *) namespaceURI{ return xmlTextReaderMoveToAttributeNs(xmlReader, (xmlChar *)[localname UTF8String], (xmlChar *)[namespaceURI UTF8String]); } @end 

Answer 2

NSXMLParser is included in the Foundation, which can meet your needs.

Answer 3

You can go directly to the source using libxml2 and their XmlReader API. This is based on the Cml XmlReader API you are referencing above, but in C.

I understand that this is not objective-c, but you can easily wrap the functionality in a class that will be accessed by the rest of your project.