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This is pretty similar to the Pencil tool. We keep track of all the current touches, as well as the start point for each of them, so that we can make a proper line path for each line segment. We use the touchesBegan:withEvent: method to save a reference to each touch we re tracking, as well as each start point. Then in touchesEnded:withEvent:, we create a new path object and send it to the delegate. Now we need to add a bit to DudelViewController, so that it knows about this class and can work with it. Start off with another import line, somewhere near the top:

CreateNode() creates an XmlNode. CreateTextNode() creates an XmlText. CreateXmlDeclaration() creates an XmlDeclaration. GetElementById() gets an element based on a specified ID. GetElementsByTagName() gets an XmlNodeList of all elements that match the specified tag. ImportNode() imports a node for another XmlDocument. Load() loads into the XmlDocument a File, Stream, TextReader, or XmlReader. LoadXml() loads into the XmlDocument a String. ReadNode() creates an XmlNode based on the current position of an XmlReader. Save() saves the XmlDocument to a specified filename, Stream, TextWriter, or XmlWriter.

Figure 1-6. Effort Tracking add/edit/delete page The web service comprises the bulk of the code for this application. There are eight methods in the web service, which handle all of the functions of the user interface.

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You have many different ways of navigating through a DOM tree. You ll start out by using only the basic methods found in XmlDocument, XmlNode, and XmlNodeList. Later you ll look at an easier way of navigating using XPaths. Because the DOM is stored in a tree in memory, it s a good candidate for navigating via recursion. The example in Listing 14-10 demonstrates an implementation of recursively following the tree branch and dumping the node information it passed along the way. You dump the tree to the system console. Listing 14-10. Reading a DOM Tree Recursively using namespace System; using namespace System::Xml; String ^indent(int depth) { String ^ind = ""; return ind->PadLeft(depth*4, ' '); } void Navigate(XmlNode ^node, int depth) { if (node == nullptr) return; Console::WriteLine("{0}: Name='{1}' Value='{2}'", String::Concat(indent(depth),node->NodeType.ToString()), node->Name, node->Value); if (node->Attributes != nullptr) { for (int i = 0; i < node->Attributes->Count; i++) { Console::WriteLine("{0}Attribute: Name='{1}' Value='{2}'", indent(depth+1),node->Attributes[i]->Name, node->Attributes[i]->Value); } }

Navigate(node->FirstChild, depth+1); Navigate(node->NextSibling, depth); } void main() { XmlDocument ^doc = gcnew XmlDocument(); try { XmlReader ^reader = XmlReader::Create("..\\Monsters.xml"); doc->Load(reader); reader->Close(); XmlNode ^node = doc->FirstChild; // I want the Xml Declaration

#import "LineTool.h"

chapters. In many cases, it does not conform to proper development guidelines, especially with regard to security. While we do point out some best practices in this regard, this application should not be used as a model for building any type of secure applications.

// Recursive navigation of the DOM tree Navigate(node, 0); } catch (Exception ^e) { Console::WriteLine("Error Occurred: {0}", e->Message); } } As I stated before, you process all XML documents within an exception try block because every XML method in the .NET Framework class library can throw an exception. Before you start reading the DOM tree, you need to load it. First, you create an XmlDocument to hold the tree. You do this using a standard constructor: XmlDocument ^doc = gcnew XmlDocument(); Then you load the XML document into the XmlDocument. It is possible to pass the name of the XML file directly into the Load() method, which I think is a little easier. But, if you do it the following way, make sure you close the file after the load is complete, because the file resource remains open longer than it needs to be. Plus, if you try to write to the file, it will throw an exception because the file is already open. XmlReader ^reader = XmlReader::Create("..\\Monsters.xml"); doc->Load(reader); reader->Close(); In the previous example, you call the XmlDocument class s FirstChild() method instead of the DocumentElement() method because you want to start reading the XML document at the XML declaration and not the first element of the document: XmlNode ^node = doc->FirstChild; // The Xml Declaration

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