i'm following Tutorials from this site :http://nickgravelyn.com/archive/#tileengine:
and im Currently on Tutorial 13:
Currently we are building a 'Preprocessor' for a custom xml file and when reading it in I place this code;
[ContentProcessor(DisplayName = "Tile Layer Processor")]
public class TileLayerProcessor : ContentProcessor<XmlDocument, TileLayerContent>
{
public override TileLayerContent Process(
XmlDocument input, ContentProcessorContext context)
{
TileLayerContent layer = new TileLayerContent();
foreach (XmlNode node in input.DocumentElement.ChildNodes) <-- Line 21
{
if (node.Name == "Textures")
{
foreach (XmlNode textureNode in node.ChildNodes)
{
string file = textureNode.Attributes["File"].Value;
int index = int.Parse(textureNode.Attributes["UUID"].Value);
The Following Error Message is Tripped on Line 21 when I build (i think)
The Error Message
Error 1 Building content threw NullReferenceException: Object reference not set to an instance of an object.
at TileContent.TileLayerProcessor.Process(XmlDocument input, ContentProcessorContext context) in I:\2D_Games\TileGame(1)\TileContent\Tiles\TileLayerProcessor.cs:line 22
at Microsoft.Xna.Framework.Content.Pipeline.ContentProcessor`2.Microsoft.Xna.Framework.Content.Pipeline.IContentProcessor.Process(Object input, ContentProcessorContext context)
at Microsoft.Xna.Framework.Content.Pipeline.BuildCoordinator.BuildAssetWorker(BuildItem item)
at Microsoft.Xna.Framework.Content.Pipeline.BuildCoordinator.BuildAsset(BuildItem item)
at Microsoft.Xna.Framework.Content.Pipeline.BuildCoordinator.RunTheBuild()
at Microsoft.Xna.Framework.Content.Pipeline.Tasks.BuildContent.RemoteProxy.RunTheBuild(BuildCoordinatorSettings settings, TimestampCache timestampCache, ITaskItem[] sourceAssets,
String[]& outputContent, String[]& rebuiltContent, String[]& intermediates, Dictionary`2&
dependencyTimestamps, KeyValuePair`2[]& warnings) I:\2D_Games\TileGame(1)\TileGame(1)\Content\Layers\Layer3.layer TileGame(1)
I am not the most familiar person with xml, however i cannot figure out wether this error message IS in the .layer file (which is a custom extension). or whether it is in the TileLayerProcessorClass(Listed Above)
Any help on this error is Appreciated, Is it a problem in the XML file?(below) or the class?
once again this problem doesnt pickup in his tutorial code. just in mine.
the Custom XML file
<TileLayer>
<Textures>
<Texture File="Tiles\se_free_grass_texture.jpg" UUID="0" />
<Texture File="Tiles\se_free_road_texture.jpg" UUID="1" />
<Texture File="Tiles\se_free_rock_texture.jpg" UUID="2" />
<Texture File="Tiles\se_free_mud_texture.jpg" UUID="3" />
</Textures>
<Properties>
<Alpha>1.0</Alpha>
</Properties>
<Layout Width="50" Height="50">
Some really massive array of [0,1,2,3]'s which is 50x50
</Layout>
</TileLayer>
