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Tutorials

Package Class

The Package class is a data provider for the internal FileSystem class. You can load all resources via this class. This article describes the sample located in the <UnigineSDK>/source/csharp/samples/Api/Systems/Package/ directory.

Notice
In the C# API you can inherit from the Package class only once.

See also#

  • An example can be found in the <UnigineSDK>/source/csharp/samples/Api/Systems/Package/ directory.
  • The C++ API Unigine::Package class and the Unigine::FileSystem class which have the same methods and behavior as in the C# API.

Package Class Usage Example#

C# Side#

To use the Unigine.Package class, you should create your own class and inherit it from the Unigine.Package class and override virtual methods.

Source code (C#)
using System;
using System.IO;
using File = System.IO.File;
using System.Runtime.InteropServices;
using Unigine;

class UnigineApp
{
	class MyPackage : Package
	{
		private FileStream file;

		public MyPackage()
		{
			Log.Message("MyPackage.ctor(): called\n");
		}

		~MyPackage()
		{
			Log.Message("MyPackage.dtor(): called\n");
		}

		// list of files
		public override int GetNumFiles()
		{
			Log.Message("MyPackage.GetNumFiles(): called\n");
			return 2;
		}

		public override string GetFileName(int num)
		{
			Log.Message("MyPackage.GetFileName({0}): called\n", num);
			if (num == 0)
				return "data/package.usc";
			if (num == 1)
				return "data/package.world";
			return "";
		}

		// select file
		public override bool SelectFile(string name, out int size)
		{
			Log.Message("MyPackage.SelectFile(\"{0}\",): called\n", name);

			try
			{
				file = null;
				if (name == "data/package.usc")
					file = File.OpenRead("my_data/package.usc");
				if (name == "data/package.world")
					file = File.OpenRead("my_data/package.world");
			}
			catch (Exception e)
			{
				Log.Error("MyPackage.SelectFile(): {0}\n", e.Message);
				size = 0;
				return false;
			}

			size = (int)file.Length;

			return true;
		}

		// read file
		public override bool ReadFile(IntPtr data, int size)
		{
			Log.Message("MyPackage.ReadFile(,{0}): called\n", size);

			try
			{
				byte[] src = new byte[size];
				int ret = file.Read(src, 0, size);
				Marshal.Copy(src, 0, data, ret);
			}
			catch (Exception e)
			{
				Log.Error("MyPackage.ReadFile(): {0}\n", e.Message);
				return false;
			}

			return true;
		}
	}

	/*
	 */
	[STAThread]
	static void Main(string[] args)
	{
		// add package
		MyPackage package = new MyPackage();
		FileSystem.PreloadExternPackage(package);

		// initialize engine
		Engine.Init(args);
		
		// enter main loop
		Engine.Main();

		// shutdown engine
		Engine.Shutdown();
	}
}

The MyPackage class has overridden ReadFile(), SelectFile(), GetFileName() and GetNumFiles() functions. The class operates with two files located in the my_data folder.

In the Main() function we create an instance of the MyPackage class and add it to the FileSystem before initializing the engine using the PreloadExternPackage() method.

Output#

The following result will be shown in the console:

Last update: 2024-08-16
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