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Game Attack Combos : WPF Hybrid Smart Client for Combo Calculations

, 23 May 2009
A WPF hybrid smart client for calculating attack combos in the Prince of Persia game.
Prize winner in Competition "Smart Client Article Contest"
GameAttackCombos_Src.zip
ComboServices
App_Data
ComboPackagesService.svc
GameAttackCombos.snk
Properties
GameAttackCombos.mdf
GameAttackCombos_log.LDF
Packages
PrinceOfPersia2008.gcp
PrinceOfPersia2010.gcp
PackageComboFiles
Properties
ServiceData
GameAttackCombosModel.edmx
Properties
Assets
Button Icons.design
Game Attack Combos Icon.design
Game Attack Combos Icon.ico
Prince of Persia 2008
Prince of Persia 2010
PrinceOfPersia2010Background.png
PrinceOfPersia2010Icon.png
PrinceOfPersia2008Background.png
PrinceOfPersia2008Icon.png
ComboClient
Game Attack Combos Icon.ico
Properties
Resources
Service References
Supporting
Themes
ComboServices
ComboPackagesService.disco
ComboPackagesService.wsdl
ComboPackagesService1.wsdl
configuration.svcinfo
configuration91.svcinfo
Reference.svcmap
app.manifest
ComboLogic
Properties
GameAttackCombos_Standalone.zip
Packages
PrinceOfPersia2008.gcp
PrinceOfPersia2010.gcp
Resources
using System.Collections.Generic;
using System.IO;
using GG.GameAttackCombos.Client.ComboServices;
using GG.GameAttackCombos.Logic;

#if !Standalone
using System.IO.IsolatedStorage;
#endif

namespace GG.GameAttackCombos.Client {

	/// <summary>
	/// A helper class for dealing with combo packages.
	/// </summary>
	public static class ComboPackageHelper {

		/// <summary>
		/// Downloads any update to the package specified.
		/// </summary>
		/// <param name="packageInfo">
		/// The ComboPackageInfo representing the package to download any update for.
		/// </param>
		/// <returns>true if an update was available and downloaded; false otherwise.</returns>
		public static bool DownloadPackageUpdate(ComboPackageInfo packageInfo) {
			bool Result = false;

			// Prepare the data state.
			byte[] PackageData = null;

			// Create a reference to the remote service.
			using (ComboPackagesServiceClient Service = new ComboPackagesServiceClient()) {
				PackageData = Service.DownloadComboPackage(packageInfo.GameCode, packageInfo.Version);
			}

			if (PackageData != null) {
				using (MemoryStream PackageStream = new MemoryStream(PackageData.Length)) {
					// Copy the downloaded data to the memory stream and open it as a package.
					// * The MemoryStream is initialized with a capacity, then the data is
					//   copied to it in order to allow it to expand with the used game code.
					StreamHelper.CopyArrayToStream(PackageData, PackageStream);
					using (ComboPackage Package = new ComboPackage(PackageStream, FileAccess.ReadWrite)) {
						// Update the package's game code.
						Package.GameCode = packageInfo.GameCode;
						Package.Save();
					}

					// Save the updated package to file.
					using (Stream PackageFileStream = OpenPackageStream(packageInfo.FileName, FileMode.Create)) {
						StreamHelper.CopyStream(PackageStream, PackageFileStream);
						Result = true;
					}
				}
			}

			return Result;
		}

		/// <summary>
		/// Downloads a new package for the specified game code and returns the new package's information.
		/// </summary>
		/// <returns>true if the package was successfully downloaded; false otherwise.</returns>
		public static ComboPackageInfo DownloadNewPackage(string newGameCode) {
			// Prepare the data state.
			ComboPackageInfo DownloadedPackageInfo = null;
			byte[] PackageData = null;

			// Create a reference to the remote service.
			using (ComboPackagesServiceClient Service = new ComboPackagesServiceClient()) {
				PackageData = Service.DownloadComboPackage(newGameCode, null);
			}
			
			if (PackageData != null) {
				// Initialize a combo package with the downloaded data to get its 
				// original file name and update its information.
				using (MemoryStream PackageStream = new MemoryStream(PackageData.Length)) {
					// Copy the downloaded data to the memory stream and open it as a package.
					// * The MemoryStream is initialized with a capacity, then the data is
					//   copied to it in order to allow it to expand with the new game code.
					StreamHelper.CopyArrayToStream(PackageData, PackageStream);
					using (ComboPackage Package = new ComboPackage(PackageStream, FileAccess.ReadWrite)) {
						// Update the package's game code.
						Package.GameCode = newGameCode;
						Package.Save();

						// Create an information instance for the downloaded package.
						DownloadedPackageInfo = new ComboPackageInfo(Package.OriginalFileName, newGameCode, Package.Title, Package.Version);
					}

					// Save the updated package to file.
					using (Stream PackageFileStream = OpenPackageStream(DownloadedPackageInfo.FileName, FileMode.Create)) {
						StreamHelper.CopyStream(PackageStream, PackageFileStream);
					}
				}
			} else {
				// Return an empty ComboPackageInfo.
				DownloadedPackageInfo = ComboPackageInfo.Empty;
			}

			return DownloadedPackageInfo;
		}

		/// <summary>
		/// Gets a list of information data for all downloaded combo packages.
		/// </summary>
		/// <returns></returns>
		public static IEnumerable<ComboPackageInfo> GetDownloadedPackageInfoList(bool includeIcon) {
			List<ComboPackageInfo> ComboPackageInfos = null;

			// Get the file names for all downloaded combo packages.
			string[] PackageFileNames = GetPackageFileNames();
			if (PackageFileNames.Length > 0) {
				// Create a list of information for the combo packages found.
				ComboPackageInfos = new List<ComboPackageInfo>(PackageFileNames.Length);
				foreach (string PackageFileName in PackageFileNames) {
					// Open each package to get the necessary information to display.
					using (Stream PackageStream = OpenPackageStream(PackageFileName)) {
						if (PackageStream.Length > 0) {
							using (ComboPackage Package = new ComboPackage(PackageStream)) {
								ComboPackageInfo Info = new ComboPackageInfo(Package, includeIcon);
								ComboPackageInfos.Add(Info);
							}
						}
					}
				}

				// Clear the list if nothing was actually added.
				if (ComboPackageInfos.Count == 0) {
					ComboPackageInfos = null;
				}
			}

			return ComboPackageInfos;
		}

		/// <summary>
		/// Gets a list of file names for game combo packages found in the appropriate location.
		/// </summary>
		/// <returns></returns>
		public static string[] GetPackageFileNames() {
			string[] PackageFileNames = null;

#if Standalone
			// Get a list of the files in the application directory with the appropriate combo
			// package file extension.
			DirectoryInfo Directory = new DirectoryInfo(Common.PackageDirectory);
			FileInfo[] Files = Directory.GetFiles(string.Format(@"*{0}", ComboPackage.ComboPackagesFileExtension), SearchOption.TopDirectoryOnly);
			if (Files.Length > 0) {
				PackageFileNames = new string[Files.Length];
				for (int i = 0; i < Files.Length; i++) {
					PackageFileNames[i] = Files[i].Name;
				}
			}
#else
			// Open isolated storage for the user and domain to retrieve a list of file names with 
			// the appropriate combo package file extension.
			using (IsolatedStorageFile Storage = IsolatedStorageFile.GetUserStoreForDomain()) {
				PackageFileNames = Storage.GetFileNames(string.Format(@"*{0}", ComboPackage.ComboPackagesFileExtension));
			}
#endif

			return PackageFileNames;
		}

		/// <summary>
		/// Opens a stream for the specified package with indicated mode, access, and share settings.
		/// </summary>
		/// <param name="packageFileName">The file name of the package to open.</param>
		/// <param name="mode">The file mode to use when opening a stream to the package.</param>
		/// <param name="access">The file access type to use when opening a stream to the package.</param>
		/// <param name="share">The file share type to use when opening a stream to the package.</param>
		/// <returns></returns>
		public static Stream OpenPackageStream(string packageFileName, FileMode mode, FileAccess access, FileShare share) {
#if Standalone
			// Open the file stream from the application directory.
			string FilePath = Path.Combine(Common.PackageDirectory, packageFileName);
			if (!OpenModeRequiresExistingFile(mode) || File.Exists(FilePath)) {
				return File.Open(FilePath, mode, access, share);
			} else {
				return null;
			}
#else
			// Open the file stream from isolated storage.
			try {
				return new IsolatedStorageFileStream(packageFileName, mode, access, share);
			} catch (FileNotFoundException) {
				return null;
			} catch (DirectoryNotFoundException) {
				return null;
			}
#endif
		}

		/// <summary>
		/// Opens a stream for the specified package with indicated mode and access.
		/// </summary>
		/// <param name="packageFileName">The file name of the package to open.</param>
		/// <param name="mode">The file mode to use when opening a stream to the package.</param>
		/// <param name="access">The file access type to use when opening a stream to the package.</param>
		/// <returns></returns>
		public static Stream OpenPackageStream(string packageFileName, FileMode mode, FileAccess access) {
#if Standalone
			// Open the file stream from the application directory.
			string FilePath = Path.Combine(Common.PackageDirectory, packageFileName);
			if (!OpenModeRequiresExistingFile(mode) || File.Exists(FilePath)) {
				return File.Open(FilePath, mode, access);
			} else {
				return null;
			}
#else
			// Open the file stream from isolated storage.
			try {
				return new IsolatedStorageFileStream(packageFileName, mode, access);
			} catch (FileNotFoundException) {
				return null;
			} catch (DirectoryNotFoundException) {
				return null;
			}
#endif
		}

		/// <summary>
		/// Opens a stream for the specified package with the indicated mode.
		/// </summary>
		/// <param name="packageFileName">The file name of the package to open.</param>
		/// <param name="mode">The file mode to use when opening a stream to the package.</param>
		/// <returns></returns>
		public static Stream OpenPackageStream(string packageFileName, FileMode mode) {
#if Standalone
			// Open the file stream from the application directory.
			string FilePath = Path.Combine(Common.PackageDirectory, packageFileName);
			if (!OpenModeRequiresExistingFile(mode) || File.Exists(FilePath)) {
				return File.Open(FilePath, mode);
			} else {
				return null;
			}
#else
			// Open the file stream from isolated storage.
			try {
				return new IsolatedStorageFileStream(packageFileName, mode);
			} catch (FileNotFoundException) {
				return null;
			} catch (DirectoryNotFoundException) {
				return null;
			}
#endif
		}

		/// <summary>
		/// Opens a stream for the specified package in Open file mode, Read file access,
		/// and Read file sharing.
		/// </summary>
		/// <param name="packageFileName">The file name of the package to open.</param>
		/// <returns></returns>
		public static Stream OpenPackageStream(string packageFileName) {
			return OpenPackageStream(packageFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
		}


		/// <summary>
		/// Determines if the specified FileMode requires an existing file.
		/// </summary>
		/// <param name="mode">The FileMode to test.</param>
		/// <returns></returns>
		private static bool OpenModeRequiresExistingFile(FileMode mode) {
			return (mode == FileMode.Append || mode == FileMode.Open || mode == FileMode.Truncate);
		}

	}

}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Matt Sollars
Web Developer
United States United States
I began programming on my Commodore 64 at around the age of 12. After migrating to DOS and then Windows, I decided to take on the Web. Several languages and platforms later, I have settled in with .NET nicely. I am currently the owner of a software consulting company and lead application developer for a learning-based technology consultation company.
 
The love of a finished application is usually at war with the desire to improve it as soon as it's released (they're never really finished).

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