Getting Started with TinyXml

Step 1: Download and install TinyXML Download and extract the library from http://www.grinninglizard.com/tinyxml/ TinyXML source files as shown: TinyXml1 Step 2: Configure Visual Studio In Visual Studio select File > New > Project. Select Empty Project: TinyXml2 Then copy the following files to your project folder • tinystr.h • tinyxml.h • tinyxmlparser.cpp • tinystr.cpp • tinyxml.cpp • tinyxmlerror.cpp From solution explorer you can then add these file to your project. Right-click the project folder and select Add > Existing Item... Step 3: Try it! That is all there is to it. You should now be in a position to try some examples. For example, consider the following example XML: [code lang="xml"] <?xml version="1.0" ?> <file> <people> <person> <forename>Andrew</forename> <surname>Jones</surname> </person> <person> <forename>David</forename> <surname>Matthews</surname> </person> <person> <forename>Jason</forename> <surname>Perkins</surname> </person> </people> </file> [/code] We may wish to interrogate the XML and read the values inside the tags it contains. This can be a straightforward matter of using calls to the the FirstChildElement method. Notice the use of checking for NULL values when using every method call, for additional robustness: [code lang="cpp"] TiXmlDocument doc( "test1.xml" ); doc.LoadFile(); TiXmlElement *l_pRootElement = doc.RootElement(); if( NULL != l_pRootElement ) { // set of &lt;person&gt; tags TiXmlElement *l_pPeople = l_pRootElement->FirstChildElement( "people" ); if ( NULL != l_pPeople ) { TiXmlElement *l_pPerson = l_pPeople->FirstChildElement( "person" ); while( l_pPerson ) { TiXmlElement *l_pForename = l_pPerson->FirstChildElement( "forename" ); if ( NULL != l_pForename ) { std::cout << l_pForename->GetText(); } TiXmlElement *l_pSurname = l_pPerson->FirstChildElement( "surname" ); if ( NULL != l_pSurname ) { std::cout << " " << l_pSurname->GetText(); } std::cout << std::endl; l_pPerson = l_pPerson->NextSiblingElement( "person" ); } } } [/code] Giving the following output: TinyXml3 As an alternative, handles have been introduced to make the reading of XML values little cleaner. Thus our code for reading the set of persons reduces to: [code lang="cpp"] TiXmlDocument doc( "test1.xml" ); doc.LoadFile(); TiXmlHandle docHandle( &doc ); TiXmlElement* l_pPerson = docHandle.FirstChild( "file" ).FirstChild( "people" ).Child( "person", 0 ).ToElement(); while( l_pPerson ) { TiXmlElement *l_pForename = l_pPerson->FirstChildElement( "forename" ); if ( NULL != l_pForename ) { std::cout << l_pForename->GetText(); } TiXmlElement *l_pSurname = l_pPerson->FirstChildElement( "surname" ); if ( NULL != l_pSurname ) { std::cout << " " << l_pSurname->GetText(); } std::cout << std::endl; l_pPerson = l_pPerson->NextSiblingElement( "person" ); } [/code] That gives us exactly the same result but with using less code: TinyXml4 Download the Visual Studio 2010 project from here. Programmatically create and save an XML Same example as given at the Grinning Lizard site, "Writing a document to a file": [code lang="cpp"] #include "tinyxml.h" int main(void) { TiXmlDocument doc; TiXmlElement* msg; TiXmlDeclaration* decl = new TiXmlDeclaration( "1.0", "", "" ); doc.LinkEndChild( decl ); TiXmlElement * root = new TiXmlElement( "MyApp" ); doc.LinkEndChild( root ); TiXmlComment * comment = new TiXmlComment(); comment->SetValue(" Settings for MyApp " ); root->LinkEndChild( comment ); TiXmlElement * msgs = new TiXmlElement( "Messages" ); root->LinkEndChild( msgs ); msg = new TiXmlElement( "Welcome" ); msg->LinkEndChild( new TiXmlText( "Welcome to MyApp" )); msgs->LinkEndChild( msg ); msg = new TiXmlElement( "Farewell" ); msg->LinkEndChild( new TiXmlText( "Thank you for using MyApp" )); msgs->LinkEndChild( msg ); TiXmlElement * windows = new TiXmlElement( "Windows" ); root->LinkEndChild( windows ); TiXmlElement * window; window = new TiXmlElement( "Window" ); windows->LinkEndChild( window ); window->SetAttribute("name", "MainFrame"); window->SetAttribute("x", 5); window->SetAttribute("y", 15); window->SetAttribute("w", 400); window->SetAttribute("h", 250); TiXmlElement * cxn = new TiXmlElement( "Connection" ); root->LinkEndChild( cxn ); cxn->SetAttribute("ip", "192.168.0.1"); cxn->SetDoubleAttribute("timeout", 123.456); // floating point attrib doc.SaveFile( "appsettings.xml" ); return 0; } [/code] Which will generate the "appsettings.xml" file: [code lang="xml"] <?xml version="1.0" ?> <MyApp> <!-- Settings for MyApp --> <Messages> <Welcome>Welcome to MyApp</Welcome> <Farewell>Thank you for using MyApp</Farewell> </Messages> <Windows> <Window name="MainFrame" x="5" y="15" w="400" h="250" /> </Windows> <Connection ip="192.168.0.1" timeout="123.456" /> </MyApp> [/code] Setting the attribute can be applied anywhere, as in this similar example: [code lang="cpp"] #include "tinyxml.h" int main(void) { TiXmlDocument doc; TiXmlElement* msg; TiXmlDeclaration* decl = new TiXmlDeclaration( "1.0", "", "" ); doc.LinkEndChild( decl ); TiXmlElement * root = new TiXmlElement( "MyApp" ); root->SetAttribute("name", "MainFrame"); root->SetAttribute("x", 5); root->SetAttribute("y", 15); root->SetAttribute("w", 400); root->SetAttribute("h", 250); doc.LinkEndChild( root ); TiXmlComment * comment = new TiXmlComment(); comment->SetValue(" Settings for MyApp " ); root->LinkEndChild( comment ); TiXmlElement * msgs = new TiXmlElement( "Messages" ); root->LinkEndChild( msgs ); msg = new TiXmlElement( "Welcome" ); msg->LinkEndChild( new TiXmlText( "Welcome to MyApp" )); msgs->LinkEndChild( msg ); msg = new TiXmlElement( "Farewell" ); msg->LinkEndChild( new TiXmlText( "Thank you for using MyApp" )); msgs->LinkEndChild( msg ); doc.SaveFile( "appsettings.xml" ); return 0; } [/code] Which produces the xml file as shown: [code land="xml"] <?xml version="1.0" ?> <MyApp name="MainFrame" x="5" y="15" w="400" h="250"> <!-- Settings for MyApp --> <Messages> <Welcome>Welcome to MyApp</Welcome> <Farewell>Thank you for using MyApp</Farewell> </Messages> </MyApp> [/code]

Comments

Post a Comment

Popular posts from this blog

Using the Supervisor Controller Pattern to access View controls in MVVM

Image
As discussed on a StackOverflow post , this is considered bad practice, so only use this when necessary. Step 1: Create a new WPF project Step 2: Add event handling code A number of classes are needed for doing command bindings in MVVM. Create the following classes and add to your Visual Studio project: RelayCommand.cs [code language="csharp"] using System; using System.Windows.Input; namespace SupervisorControllingPattern { public class RelayCommand<T> : ICommand { private readonly Predicate<T> _canExecute; private readonly Action<T> _execute; public RelayCommand(Action<T> execute) : this(execute, null) { _execute = execute; } public RelayCommand(Action<T> execute, Predicate<T> canExecute) { if (execute == null) throw new ArgumentNullException(nameof(execute)); _execute = execute; _canExecute = canExecute; ...
Read more

Getting started with client-server applications in C++

Image
A demonstration of simple Internet client-server applications in C++ (Linux-based). The client application tries to connect to the remote server application using the IP address of the remote server ('localhost' or 127.0.0.1) and the server port number which defaulted to 1234. The server application listens to port number 1234 for a connection request. When the server application receives the connection request it sends the text message "Hello!\r\n" to the client.
Read more

How to send an e-mail via Google SMTP using C#

Image
First things first, some useful StackOverflow links: https://stackoverflow.com/questions/9201239/send-e-mail-via-smtp-using-c-sharp https://stackoverflow.com/questions/17462628/the-server-response-was-5-7-0-must-issue-a-starttls-command-first-i16sm1806350 To demonstrate how this is done I first create a new Visual Studio project: Some example code for sending an email via a Google email account (smtp.goolgle.com) - obviously replace this with email / credentials of your own... I put the code within a try-catch block in order to capture any errors that may occur while attempting this. [code language="csharp"] using System; using System.Net; using System.Net.Mail; namespace EmailSmtp { class Program { static void Main(string[] args) { try { // Credentials var credentials = new NetworkCredential("someEmail@gmail.com", "somePassword"); // Mail message var ...
Read more