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• Calling AuditQuerySystemPolicy() (advapi32.dll) from C# returns "The parameter is incorrect"

  - by JCCyC

  The sequence is like follows: Open a policy handle with LsaOpenPolicy() (not shown) Call LsaQueryInformationPolicy() to get the number of categories; For each category: Call AuditLookupCategoryGuidFromCategoryId() to turn the enum value into a GUID; Call AuditEnumerateSubCategories() to get a list of the GUIDs of all subcategories; Call AuditQuerySystemPolicy() to get the audit policies for the subcategories. All of these work and return expected, sensible values except the last. Calling AuditQuerySystemPolicy() gets me a "The parameter is incorrect" error. I'm thinking there must be some subtle unmarshaling problem. I'm probably misinterpreting what exactly AuditEnumerateSubCategories() returns, but I'm stumped. You'll see (commented) I tried to dereference the return pointer from AuditEnumerateSubCategories() as a pointer. Doing or not doing that gives the same result. Code: #region LSA types public enum POLICY_INFORMATION_CLASS { PolicyAuditLogInformation = 1, PolicyAuditEventsInformation, PolicyPrimaryDomainInformation, PolicyPdAccountInformation, PolicyAccountDomainInformation, PolicyLsaServerRoleInformation, PolicyReplicaSourceInformation, PolicyDefaultQuotaInformation, PolicyModificationInformation, PolicyAuditFullSetInformation, PolicyAuditFullQueryInformation, PolicyDnsDomainInformation } public enum POLICY_AUDIT_EVENT_TYPE { AuditCategorySystem, AuditCategoryLogon, AuditCategoryObjectAccess, AuditCategoryPrivilegeUse, AuditCategoryDetailedTracking, AuditCategoryPolicyChange, AuditCategoryAccountManagement, AuditCategoryDirectoryServiceAccess, AuditCategoryAccountLogon } [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] public struct POLICY_AUDIT_EVENTS_INFO { public bool AuditingMode; public IntPtr EventAuditingOptions; public UInt32 MaximumAuditEventCount; } [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] public struct GUID { public UInt32 Data1; public UInt16 Data2; public UInt16 Data3; public Byte Data4a; public Byte Data4b; public Byte Data4c; public Byte Data4d; public Byte Data4e; public Byte Data4f; public Byte Data4g; public Byte Data4h; public override string ToString() { return Data1.ToString("x8") + "-" + Data2.ToString("x4") + "-" + Data3.ToString("x4") + "-" + Data4a.ToString("x2") + Data4b.ToString("x2") + "-" + Data4c.ToString("x2") + Data4d.ToString("x2") + Data4e.ToString("x2") + Data4f.ToString("x2") + Data4g.ToString("x2") + Data4h.ToString("x2"); } } #endregion #region LSA Imports [DllImport("kernel32.dll")] extern static int GetLastError(); [DllImport("advapi32.dll", CharSet = CharSet.Unicode, PreserveSig = true)] public static extern UInt32 LsaNtStatusToWinError( long Status); [DllImport("advapi32.dll", CharSet = CharSet.Unicode, PreserveSig = true)] public static extern long LsaOpenPolicy( ref LSA_UNICODE_STRING SystemName, ref LSA_OBJECT_ATTRIBUTES ObjectAttributes, Int32 DesiredAccess, out IntPtr PolicyHandle ); [DllImport("advapi32.dll", CharSet = CharSet.Unicode, PreserveSig = true)] public static extern long LsaClose(IntPtr PolicyHandle); [DllImport("advapi32.dll", CharSet = CharSet.Unicode, PreserveSig = true)] public static extern long LsaFreeMemory(IntPtr Buffer); [DllImport("advapi32.dll", CharSet = CharSet.Unicode, PreserveSig = true)] public static extern void AuditFree(IntPtr Buffer); [DllImport("advapi32.dll", SetLastError = true, PreserveSig = true)] public static extern long LsaQueryInformationPolicy( IntPtr PolicyHandle, POLICY_INFORMATION_CLASS InformationClass, out IntPtr Buffer); [DllImport("advapi32.dll", SetLastError = true, PreserveSig = true)] public static extern bool AuditLookupCategoryGuidFromCategoryId( POLICY_AUDIT_EVENT_TYPE AuditCategoryId, IntPtr pAuditCategoryGuid); [DllImport("advapi32.dll", SetLastError = true, PreserveSig = true)] public static extern bool AuditEnumerateSubCategories( IntPtr pAuditCategoryGuid, bool bRetrieveAllSubCategories, out IntPtr ppAuditSubCategoriesArray, out ulong pCountReturned); [DllImport("advapi32.dll", SetLastError = true, PreserveSig = true)] public static extern bool AuditQuerySystemPolicy( IntPtr pSubCategoryGuids, ulong PolicyCount, out IntPtr ppAuditPolicy); #endregion Dictionary<string, UInt32> retList = new Dictionary<string, UInt32>(); long lretVal; uint retVal; IntPtr pAuditEventsInfo; lretVal = LsaQueryInformationPolicy(policyHandle, POLICY_INFORMATION_CLASS.PolicyAuditEventsInformation, out pAuditEventsInfo); retVal = LsaNtStatusToWinError(lretVal); if (retVal != 0) { LsaClose(policyHandle); throw new System.ComponentModel.Win32Exception((int)retVal); } POLICY_AUDIT_EVENTS_INFO myAuditEventsInfo = new POLICY_AUDIT_EVENTS_INFO(); myAuditEventsInfo = (POLICY_AUDIT_EVENTS_INFO)Marshal.PtrToStructure(pAuditEventsInfo, myAuditEventsInfo.GetType()); IntPtr subCats = IntPtr.Zero; ulong nSubCats = 0; for (int audCat = 0; audCat < myAuditEventsInfo.MaximumAuditEventCount; audCat++) { GUID audCatGuid = new GUID(); if (!AuditLookupCategoryGuidFromCategoryId((POLICY_AUDIT_EVENT_TYPE)audCat, new IntPtr(&audCatGuid))) { int causingError = GetLastError(); LsaFreeMemory(pAuditEventsInfo); LsaClose(policyHandle); throw new System.ComponentModel.Win32Exception(causingError); } if (!AuditEnumerateSubCategories(new IntPtr(&audCatGuid), true, out subCats, out nSubCats)) { int causingError = GetLastError(); LsaFreeMemory(pAuditEventsInfo); LsaClose(policyHandle); throw new System.ComponentModel.Win32Exception(causingError); } // Dereference the first pointer-to-pointer to point to the first subcategory // subCats = (IntPtr)Marshal.PtrToStructure(subCats, subCats.GetType()); if (nSubCats > 0) { IntPtr audPolicies = IntPtr.Zero; if (!AuditQuerySystemPolicy(subCats, nSubCats, out audPolicies)) { int causingError = GetLastError(); if (subCats != IntPtr.Zero) AuditFree(subCats); LsaFreeMemory(pAuditEventsInfo); LsaClose(policyHandle); throw new System.ComponentModel.Win32Exception(causingError); } AUDIT_POLICY_INFORMATION myAudPol = new AUDIT_POLICY_INFORMATION(); for (ulong audSubCat = 0; audSubCat < nSubCats; audSubCat++) { // Process audPolicies[audSubCat], turn GUIDs into names, fill retList. // http://msdn.microsoft.com/en-us/library/aa373931%28VS.85%29.aspx // http://msdn.microsoft.com/en-us/library/bb648638%28VS.85%29.aspx IntPtr itemAddr = IntPtr.Zero; IntPtr itemAddrAddr = new IntPtr(audPolicies.ToInt64() + (long)(audSubCat * (ulong)Marshal.SizeOf(itemAddr))); itemAddr = (IntPtr)Marshal.PtrToStructure(itemAddrAddr, itemAddr.GetType()); myAudPol = (AUDIT_POLICY_INFORMATION)Marshal.PtrToStructure(itemAddr, myAudPol.GetType()); retList[myAudPol.AuditSubCategoryGuid.ToString()] = myAudPol.AuditingInformation; } if (audPolicies != IntPtr.Zero) AuditFree(audPolicies); } if (subCats != IntPtr.Zero) AuditFree(subCats); subCats = IntPtr.Zero; nSubCats = 0; } lretVal = LsaFreeMemory(pAuditEventsInfo); retVal = LsaNtStatusToWinError(lretVal); if (retVal != 0) throw new System.ComponentModel.Win32Exception((int)retVal); lretVal = LsaClose(policyHandle); retVal = LsaNtStatusToWinError(lretVal); if (retVal != 0) throw new System.ComponentModel.Win32Exception((int)retVal);

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• Hide editor-label for public property when calling EditorFor(...)?

  - by FreshCode

  When calling Html.EditorFor(m => m), where m is a public class with public properties, a hidden input and a label are displayed for properties with the [HiddenInput] attribute. How can I hide the label without making it private or creating an editor template? Example public class User { [HiddenInput] public Guid ID { get; set; } // should not be displayed in editor template public string Name { get; set; } // should be editable } Undesired result for ID property by EditorFor(...) with label <div class="editor-label"> <label for="ID">ID</label> <!-- Why is this here? --> </div> <div class="editor-field"> <input id="ID" name="ID" type="hidden" value=""> </div>

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• How to hide editor-label for public property when calling EditorFor(...)?

  - by FreshCode

  When calling Html.EditorFor(m => m), where m is a public class with public properties, a hidden input and a label are displayed for properties with the [HiddenInput] attribute. How can I hide the label without making it private or creating an editor template? Example public class User { [HiddenInput] public Guid ID { get; set; } // should not be displayed in editor template public string Name { get; set; } // should be editable } Undesired result for ID property by EditorFor(...) with label <div class="editor-label"> <label for="ID">ID</label> <!-- Why is this here? --> </div> <div class="editor-field"> <input id="ID" name="ID" type="hidden" value=""> </div>

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• custom collection in property grid

  - by guyl

  Hi guys. I'm using this article as a reference to use custom collection in propertygrid: LINK When I open the collectioneditor and remove all items then I press OK, I get an exception if null. How can i solve that ? I am using: public T this[int index] { get { if (List.Count == 0) { return default(T); } else { return (T)this.List[index]; } } } as a getter for an item, of course if I have no object how can i restart the whole collection ? this is the whole code /// <summary> /// A generic folder settings collection to use in a property grid. /// </summary> /// <typeparam name="T">can be import or export folder settings.</typeparam> [Serializable] [TypeConverter(typeof(FolderSettingsCollectionConverter)), Editor(typeof(FolderSettingsCollectionEditor), typeof(UITypeEditor))] public class FolderSettingsCollection_New<T> : CollectionBase, ICustomTypeDescriptor { private bool m_bRestrictNumberOfItems; private int m_bNumberOfItems; private Dictionary<string, int> m_UID2Idx = new Dictionary<string, int>(); private T[] arrTmp; /// <summary> /// C'tor, can determine the number of objects to hold. /// </summary> /// <param name="bRestrictNumberOfItems">restrict the number of folders to hold.</param> /// <param name="iNumberOfItems">The number of folders to hold.</param> public FolderSettingsCollection_New(bool bRestrictNumberOfItems = false , int iNumberOfItems = 1) { m_bRestrictNumberOfItems = bRestrictNumberOfItems; m_bNumberOfItems = iNumberOfItems; } /// <summary> /// Add folder to collection. /// </summary> /// <param name="t">Folder to add.</param> public void Add(T t) { if (m_bRestrictNumberOfItems) { if (this.List.Count >= m_bNumberOfItems) { return; } } int index = this.List.Add(t); if (t is WriteDataFolderSettings || t is ReadDataFolderSettings) { FolderSettingsBase tmp = t as FolderSettingsBase; m_UID2Idx.Add(tmp.UID, index); } } /// <summary> /// Remove folder to collection. /// </summary> /// <param name="t">Folder to remove.</param> public void Remove(T t) { this.List.Remove(t); if (t is WriteDataFolderSettings || t is ReadDataFolderSettings) { FolderSettingsBase tmp = t as FolderSettingsBase; m_UID2Idx.Remove(tmp.UID); } } /// <summary> /// Gets ot sets a folder. /// </summary> /// <param name="index">The index of the folder in the collection.</param> /// <returns>A folder object.</returns> public T this[int index] { get { //if (List.Count == 0) //{ // return default(T); //} //else //{ return (T)this.List[index]; //} } } /// <summary> /// Gets or sets a folder. /// </summary> /// <param name="sUID">The UID of the folder.</param> /// <returns>A folder object.</returns> public T this[string sUID] { get { if (this.Count == 0 || !m_UID2Idx.ContainsKey(sUID)) { return default(T); } else { return (T)this.List[m_UID2Idx[sUID]]; } } } /// <summary> /// /// </summary> /// <param name="sUID"></param> /// <returns></returns> public bool ContainsItemByUID(string sUID) { return m_UID2Idx.ContainsKey(sUID); } /// <summary> /// /// </summary> /// <returns></returns> public String GetClassName() { return TypeDescriptor.GetClassName(this, true); } /// <summary> /// /// </summary> /// <returns></returns> public AttributeCollection GetAttributes() { return TypeDescriptor.GetAttributes(this, true); } /// <summary> /// /// </summary> /// <returns></returns> public String GetComponentName() { return TypeDescriptor.GetComponentName(this, true); } /// <summary> /// /// </summary> /// <returns></returns> public TypeConverter GetConverter() { return TypeDescriptor.GetConverter(this, true); } /// <summary> /// /// </summary> /// <returns></returns> public EventDescriptor GetDefaultEvent() { return TypeDescriptor.GetDefaultEvent(this, true); } /// <summary> /// /// </summary> /// <returns></returns> public PropertyDescriptor GetDefaultProperty() { return TypeDescriptor.GetDefaultProperty(this, true); } /// <summary> /// /// </summary> /// <param name="editorBaseType"></param> /// <returns></returns> public object GetEditor(Type editorBaseType) { return TypeDescriptor.GetEditor(this, editorBaseType, true); } /// <summary> /// /// </summary> /// <param name="attributes"></param> /// <returns></returns> public EventDescriptorCollection GetEvents(Attribute[] attributes) { return TypeDescriptor.GetEvents(this, attributes, true); } /// <summary> /// /// </summary> /// <returns></returns> public EventDescriptorCollection GetEvents() { return TypeDescriptor.GetEvents(this, true); } /// <summary> /// /// </summary> /// <param name="pd"></param> /// <returns></returns> public object GetPropertyOwner(PropertyDescriptor pd) { return this; } /// <summary> /// /// </summary> /// <param name="attributes"></param> /// <returns></returns> public PropertyDescriptorCollection GetProperties(Attribute[] attributes) { return GetProperties(); } /// <summary> /// Called to get the properties of this type. /// </summary> /// <returns></returns> public PropertyDescriptorCollection GetProperties() { // Create a collection object to hold property descriptors PropertyDescriptorCollection pds = new PropertyDescriptorCollection(null); // Iterate the list of employees for (int i = 0; i < this.List.Count; i++) { // Create a property descriptor for the employee item and add to the property descriptor collection CollectionPropertyDescriptor_New<T> pd = new CollectionPropertyDescriptor_New<T>(this, i); pds.Add(pd); } // return the property descriptor collection return pds; } public T[] ToArray() { if (arrTmp == null) { arrTmp = new T[List.Count]; for (int i = 0; i < List.Count; i++) { arrTmp[i] = (T)List[i]; } } return arrTmp; } } /// <summary> /// Enable to display data about a collection in a property grid. /// </summary> /// <typeparam name="T">Folder object.</typeparam> public class CollectionPropertyDescriptor_New<T> : PropertyDescriptor { private FolderSettingsCollection_New<T> collection = null; private int index = -1; /// <summary> /// /// </summary> /// <param name="coll"></param> /// <param name="idx"></param> public CollectionPropertyDescriptor_New(FolderSettingsCollection_New<T> coll, int idx) : base("#" + idx.ToString(), null) { this.collection = coll; this.index = idx; } /// <summary> /// /// </summary> public override AttributeCollection Attributes { get { return new AttributeCollection(null); } } /// <summary> /// /// </summary> /// <param name="component"></param> /// <returns></returns> public override bool CanResetValue(object component) { return true; } /// <summary> /// /// </summary> public override Type ComponentType { get { return this.collection.GetType(); } } /// <summary> /// /// </summary> public override string DisplayName { get { if (this.collection[index] != null) { return this.collection[index].ToString(); } else { return null; } } } public override string Description { get { return ""; } } /// <summary> /// /// </summary> /// <param name="component"></param> /// <returns></returns> public override object GetValue(object component) { if (this.collection[index] != null) { return this.collection[index]; } else { return null; } } /// <summary> /// /// </summary> public override bool IsReadOnly { get { return false; } } public override string Name { get { return "#" + index.ToString(); } } /// <summary> /// /// </summary> public override Type PropertyType { get { return this.collection[index].GetType(); } } public override void ResetValue(object component) { } /// <summary> /// /// </summary> /// <param name="component"></param> /// <returns></returns> public override bool ShouldSerializeValue(object component) { return true; } /// <summary> /// /// </summary> /// <param name="component"></param> /// <param name="value"></param> public override void SetValue(object component, object value) { // this.collection[index] = value; } }

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• howto parse struct to C++ dll from C#

  - by Nerds Rule

  I am trying to call a function in a unmanaged C++ dll. It has this prototype: [DllImport("C:\\Program Files\\MySDK\\VSeries.dll", EntryPoint = "BII_Send_Index_Template_MT" )] internal unsafe static extern Int32 BII_Send_Index_Template_MT(IntPtr pUnitHandle, ref BII_Template template, Int32 option, Boolean async); BII_Template template = new BII_Template(); error_code = BII_Send_Index_Template_MT(pUnitHandle, ref template, option, false); I is how I define the BII_Template struct in C#: public unsafe struct BII_Template { public ulong id; public ulong employee_id; public ulong password; public byte sensor_version; public byte template_version; public fixed char name[16]; public byte finger; public byte admin_level; public byte schedule; public byte security_thresh; public fixed byte noise_level[18]; public byte corramb; public byte reference_x; public byte reference_y; public fixed byte ihcore[3]; public fixed byte ivcore[3]; public byte temp_xoffset; public byte temp_yoffset; public byte index; public fixed byte inphase[5500]; }; It build and when I run it the dll return error_code = "The record checksum is invalid." I assume that I am using the ref keyword in a wrong way or the size of some of the elements in the struct is wrong. ----- EDIT ------------ Here is the struct in C++: typedef struct { unsigned long id; unsigned long employee_id; unsigned long password; unsigned char sensor_version; unsigned char template_version; char name[16]; unsigned char finger; unsigned char admin_level; unsigned char schedule; unsigned char security_thresh; unsigned char noise_level[18]; unsigned char corramb ; unsigned char reference_x ; unsigned char reference_y ; unsigned char ihcore[NUM_CORE]; unsigned char ivcore[NUM_CORE]; unsigned char temp_xoffset; unsigned char temp_yoffset; unsigned char index; unsigned char inphase[PACKED_ARRAY_SIZE]; } BII_Template;

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• Is It possible to use the second part of this code for repository patterns and generics

  - by newToCSharp

  Is there any issues in using version 2,to get the same results as version 1. Or is this just bad coding. Any Ideas public class Customer { public int CustomerID { get; set; } public string EmailAddress { get; set; } int Age { get; set; } } public interface ICustomer { void AddNewCustomer(Customer Customer); void AddNewCustomer(string EmailAddress, int Age); void RemoveCustomer(Customer Customer); } public class BALCustomer { private readonly ICustomer dalCustomer; public BALCustomer(ICustomer dalCustomer) { this.dalCustomer = dalCustomer; } public void Add_A_New_Customer(Customer Customer) { dalCustomer.AddNewCustomer(Customer); } public void Remove_A_Existing_Customer(Customer Customer) { dalCustomer.RemoveCustomer(Customer); } } public class CustomerDataAccess : ICustomer { public void AddNewCustomer(Customer Customer) { // MAKE DB CONNECTION AND EXECUTE throw new NotImplementedException(); } public void AddNewCustomer(string EmailAddress, int Age) { // MAKE DB CONNECTION AND EXECUTE throw new NotImplementedException(); } public void RemoveCustomer(Customer Customer) { // MAKE DB CONNECTION AND EXECUTE throw new NotImplementedException(); } } // VERSION 2 public class Customer_New : DataRespository<CustomerDataAccess> { public int CustomerID { get; set; } public string EmailAddress { get; set; } public int Age { get; set; } } public class DataRespository<T> where T:class,new() { private T item = new T(); public T Execute { get { return item; } set { item = value; } } public void Update() { //TO BE CODED } public void Save() { //TO BE CODED } public void Remove() { //TO BE CODED } } class Program { static void Main(string[] args) { Customer_New cus = new Customer_New() { Age = 10, EmailAddress = "[email protected]" }; cus.Save(); cus.Execute.RemoveCustomer(new Customer()); // Repository Version Customer customer = new Customer() { EmailAddress = "[email protected]", CustomerID = 10 }; BALCustomer bal = new BALCustomer(new CustomerDataAccess()); bal.Add_A_New_Customer(customer); } } }

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• Why would a 'public event EventHandler cccc' be null?

  - by Matt

  Why would a 'public event EventHandler cccc' be null? I have a class that's public class Builder { public event EventHandler StartedWorking; public Builder() { // Constructor does some stuff } public void Start() { StartedWorking(this, eventargobject); //StartedWorking is null -- } } This seems straightforward and something I do all the time? Am I missing something obvious or is there something that could cause this? EDIT: Does this mean that if I fire an event that is not subscribed to in a client class I have to check that it is not null? EDIT-2: I guess I'd never had events that were never not subscribed to and hence never ran into this -- You learn something new every day Sorry about the seemingly stupid question....

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• How to implement a 2d collision detection for Android

  - by Michael Seun Araromi

  I am making a 2d space shooter using opengl ES. Can someone please show me how to implement a collision detection between the enemy ship and player ship. The code for the two classes are below: Player Ship Class: package com.proandroidgames; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.FloatBuffer; import javax.microedition.khronos.opengles.GL10; public class SSGoodGuy { public boolean isDestroyed = false; private int damage = 0; private FloatBuffer vertexBuffer; private FloatBuffer textureBuffer; private ByteBuffer indexBuffer; private float vertices[] = { 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, }; private float texture[] = { 0.0f, 0.0f, 0.25f, 0.0f, 0.25f, 0.25f, 0.0f, 0.25f, }; private byte indices[] = { 0, 1, 2, 0, 2, 3, }; public void applyDamage(){ damage++; if (damage == SSEngine.PLAYER_SHIELDS){ isDestroyed = true; } } public SSGoodGuy() { ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4); byteBuf.order(ByteOrder.nativeOrder()); vertexBuffer = byteBuf.asFloatBuffer(); vertexBuffer.put(vertices); vertexBuffer.position(0); byteBuf = ByteBuffer.allocateDirect(texture.length * 4); byteBuf.order(ByteOrder.nativeOrder()); textureBuffer = byteBuf.asFloatBuffer(); textureBuffer.put(texture); textureBuffer.position(0); indexBuffer = ByteBuffer.allocateDirect(indices.length); indexBuffer.put(indices); indexBuffer.position(0); } public void draw(GL10 gl, int[] spriteSheet) { gl.glBindTexture(GL10.GL_TEXTURE_2D, spriteSheet[0]); gl.glFrontFace(GL10.GL_CCW); gl.glEnable(GL10.GL_CULL_FACE); gl.glCullFace(GL10.GL_BACK); gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer); gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer); gl.glDrawElements(GL10.GL_TRIANGLES, indices.length, GL10.GL_UNSIGNED_BYTE, indexBuffer); gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY); gl.glDisable(GL10.GL_CULL_FACE); } } Enemy Ship Class: package com.proandroidgames; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.FloatBuffer; import java.util.Random; import javax.microedition.khronos.opengles.GL10; public class SSEnemy { public float posY = 0f; public float posX = 0f; public float posT = 0f; public float incrementXToTarget = 0f; public float incrementYToTarget = 0f; public int attackDirection = 0; public boolean isDestroyed = false; private int damage = 0; public int enemyType = 0; public boolean isLockedOn = false; public float lockOnPosX = 0f; public float lockOnPosY = 0f; private Random randomPos = new Random(); private FloatBuffer vertexBuffer; private FloatBuffer textureBuffer; private ByteBuffer indexBuffer; private float vertices[] = { 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, }; private float texture[] = { 0.0f, 0.0f, 0.25f, 0.0f, 0.25f, 0.25f, 0.0f, 0.25f, }; private byte indices[] = { 0, 1, 2, 0, 2, 3, }; public void applyDamage() { damage++; switch (enemyType) { case SSEngine.TYPE_INTERCEPTOR: if (damage == SSEngine.INTERCEPTOR_SHIELDS) { isDestroyed = true; } break; case SSEngine.TYPE_SCOUT: if (damage == SSEngine.SCOUT_SHIELDS) { isDestroyed = true; } break; case SSEngine.TYPE_WARSHIP: if (damage == SSEngine.WARSHIP_SHIELDS) { isDestroyed = true; } break; } } public SSEnemy(int type, int direction) { enemyType = type; attackDirection = direction; posY = (randomPos.nextFloat() * 4) + 4; switch (attackDirection) { case SSEngine.ATTACK_LEFT: posX = 0; break; case SSEngine.ATTACK_RANDOM: posX = randomPos.nextFloat() * 3; break; case SSEngine.ATTACK_RIGHT: posX = 3; break; } posT = SSEngine.SCOUT_SPEED; ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4); byteBuf.order(ByteOrder.nativeOrder()); vertexBuffer = byteBuf.asFloatBuffer(); vertexBuffer.put(vertices); vertexBuffer.position(0); byteBuf = ByteBuffer.allocateDirect(texture.length * 4); byteBuf.order(ByteOrder.nativeOrder()); textureBuffer = byteBuf.asFloatBuffer(); textureBuffer.put(texture); textureBuffer.position(0); indexBuffer = ByteBuffer.allocateDirect(indices.length); indexBuffer.put(indices); indexBuffer.position(0); } public float getNextScoutX() { if (attackDirection == SSEngine.ATTACK_LEFT) { return (float) ((SSEngine.BEZIER_X_4 * (posT * posT * posT)) + (SSEngine.BEZIER_X_3 * 3 * (posT * posT) * (1 - posT)) + (SSEngine.BEZIER_X_2 * 3 * posT * ((1 - posT) * (1 - posT))) + (SSEngine.BEZIER_X_1 * ((1 - posT) * (1 - posT) * (1 - posT)))); } else { return (float) ((SSEngine.BEZIER_X_1 * (posT * posT * posT)) + (SSEngine.BEZIER_X_2 * 3 * (posT * posT) * (1 - posT)) + (SSEngine.BEZIER_X_3 * 3 * posT * ((1 - posT) * (1 - posT))) + (SSEngine.BEZIER_X_4 * ((1 - posT) * (1 - posT) * (1 - posT)))); } } public float getNextScoutY() { return (float) ((SSEngine.BEZIER_Y_1 * (posT * posT * posT)) + (SSEngine.BEZIER_Y_2 * 3 * (posT * posT) * (1 - posT)) + (SSEngine.BEZIER_Y_3 * 3 * posT * ((1 - posT) * (1 - posT))) + (SSEngine.BEZIER_Y_4 * ((1 - posT) * (1 - posT) * (1 - posT)))); } public void draw(GL10 gl, int[] spriteSheet) { gl.glBindTexture(GL10.GL_TEXTURE_2D, spriteSheet[0]); gl.glFrontFace(GL10.GL_CCW); gl.glEnable(GL10.GL_CULL_FACE); gl.glCullFace(GL10.GL_BACK); gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer); gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer); gl.glDrawElements(GL10.GL_TRIANGLES, indices.length, GL10.GL_UNSIGNED_BYTE, indexBuffer); gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY); gl.glDisable(GL10.GL_CULL_FACE); } }

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• Cisco ASA user authentication options - OpenID, public RSA sig, others?

  - by Ryan

  My organization has a Cisco ASA 5510 which I have made act as a firewall/gateway for one of our offices. Most resources a remote user would come looking for exist inside. I've implemented the usual deal - basic inside networks with outbound NAT, one primary outside interface with some secondary public IPs in the PAT pool for public-facing services, a couple site-to-site IPSec links to other branches, etc. - and I'm working now on VPN. I have the WebVPN (clientless SSL VPN) working and even traversing the site-to-site links. At the moment I'm leaving a legacy OpenVPN AS in place for thick client VPN. What I would like to do is standardize on an authentication method for all VPN then switch to the Cisco's IPSec thick VPN server. I'm trying to figure out what's really possible for authentication for these VPN users (thick client and clientless). My organization uses Google Apps and we already use dotnetopenauth to authenticate users for a couple internal services. I'd like to be able to do the same thing for thin and thick VPN. Alternatively a signature-based solution using RSA public keypairs (ssh-keygen type) would be useful to identify user@hardware. I'm trying to get away from legacy username/password auth especially if it's internal to the Cisco (just another password set to manage and for users to forget). I know I can map against an existing LDAP server but we have LDAP accounts created for only about 10% of the user base (mostly developers for Linux shell access). I guess what I'm looking for is a piece of middleware which appears to the Cisco as an LDAP server but will interface with the user's existing OpenID identity. Nothing I've seen in the Cisco suggests it can do this natively. But RSA public keys would be a runner-up, and much much better than standalone or even LDAP auth. What's really practical here?

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• EC2: is an instance's public DNS stable? Can I rely on it not changing?

  - by Aseem Kishore

  I'm new to Amazon EC2. I've launched my first instance, and am using it as a web server. I see that it has a public DNS (a public URL), e.g.: ec2-123-45-6-789.compute-1.amazonaws.com I can successfully go to this server in my browser, hit it via cURL, etc. I want to use this web server for a back-end service in an app I'm building, so I placed this URL in my app's config, and it works great. But when I manually stop and re-started my instance, I see that the public DNS changes! I've read that this happens when you explicitly stop and re-start, but doesn't happen if you just "reboot". I don't plan on explicitly stopping and re-starting this server ever, but my question is: will this public DNS ever change on its own for any reason? E.g. if the machine abnormally crashes, or whatever. In other words, is it safe to ship an app that's wired to this URL? Thanks!

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• What should a developer know before building a public web site?

  - by Joel Coehoorn

  What things should a programmer implementing the technical details of a web site address before making the site public? If Jeff Atwood can forget about HttpOnly cookies, sitemaps, and cross-site request forgeries all in the same site, what important thing could I be forgetting as well? I'm thinking about this from a web developer's perspective, such that someone else is creating the actual design and content for the site. So while usability and content may be more important than the platform, you the programmer have little say in that. What you do need to worry about is that your implementation of the platform is stable, performs well, is secure, and meets any other business goals (like not cost too much, take too long to build, and rank as well with Google as the content supports). Think of this from the perspective of a developer who's done some work for intranet-type applications in a fairly trusted environment, and is about to have his first shot and putting out a potentially popular site for the entire big bad world wide web. Also: I'm looking for something more specific than just a vague "web standards" response. I mean, HTML, JavaScript, and CSS over HTTP are pretty much a given, especially when I've already specified that you're a professional web developer. So going beyond that, Which standards? In what circumstances, and why? Provide a link to the standard's specification. This question is community wiki, so please feel free to edit that answer to add links to good articles that will help explain or teach each particular point. To search in only the answers from this question, use the inquestion:this option.

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• Cisco ASA user authentication options - OpenID, public RSA sig, others?

  - by Ryan

  My organization has a Cisco ASA 5510 which I have made act as a firewall/gateway for one of our offices. Most resources a remote user would come looking for exist inside. I've implemented the usual deal - basic inside networks with outbound NAT, one primary outside interface with some secondary public IPs in the PAT pool for public-facing services, a couple site-to-site IPSec links to other branches, etc. - and I'm working now on VPN. I have the WebVPN (clientless SSL VPN) working and even traversing the site-to-site links. At the moment I'm leaving a legacy OpenVPN AS in place for thick client VPN. What I would like to do is standardize on an authentication method for all VPN then switch to the Cisco's IPSec thick VPN server. I'm trying to figure out what's really possible for authentication for these VPN users (thick client and clientless). My organization uses Google Apps and we already use dotnetopenauth to authenticate users for a couple internal services. I'd like to be able to do the same thing for thin and thick VPN. Alternatively a signature-based solution using RSA public keypairs (ssh-keygen type) would be useful to identify user@hardware. I'm trying to get away from legacy username/password auth especially if it's internal to the Cisco (just another password set to manage and for users to forget). I know I can map against an existing LDAP server but we have LDAP accounts created for only about 10% of the user base (mostly developers for Linux shell access). I guess what I'm looking for is a piece of middleware which appears to the Cisco as an LDAP server but will interface with the user's existing OpenID identity. Nothing I've seen in the Cisco suggests it can do this natively. But RSA public keys would be a runner-up, and much much better than standalone or even LDAP auth. What's really practical here?

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• What technical details should a programmer of a web application consider before making the site public?

  - by Joel Coehoorn

  What things should a programmer implementing the technical details of a web application consider before making the site public? If Jeff Atwood can forget about HttpOnly cookies, sitemaps, and cross-site request forgeries all in the same site, what important thing could I be forgetting as well? I'm thinking about this from a web developer's perspective, such that someone else is creating the actual design and content for the site. So while usability and content may be more important than the platform, you the programmer have little say in that. What you do need to worry about is that your implementation of the platform is stable, performs well, is secure, and meets any other business goals (like not cost too much, take too long to build, and rank as well with Google as the content supports). Think of this from the perspective of a developer who's done some work for intranet-type applications in a fairly trusted environment, and is about to have his first shot and putting out a potentially popular site for the entire big bad world wide web. Also, I'm looking for something more specific than just a vague "web standards" response. I mean, HTML, JavaScript, and CSS over HTTP are pretty much a given, especially when I've already specified that you're a professional web developer. So going beyond that, Which standards? In what circumstances, and why? Provide a link to the standard's specification.

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• How to route outbound traffic to specific domain "XYZ.org" via a specific NIC or public/static IP?

  - by user139943

  Within the next week or so, I'll be setting up an AT&T U-verse modem with 5 usable static public IP addresses. I plan to register a domain name to 1 of the 5 static IPs (remaining 4 unregistered), and run a website from a single server setup in my home LAN. I'll skip the long winded reason why, but I need to somehow route outbound traffic (originating from my server) destined for one public domain (i.e. http://www.sample.org) through one of the UNREGISTERED static IP addresses ONLY. Basically, I want this public domain to see connections coming from an IP address and not my domain name. If it makes it easier, this can apply to all outbound traffic from my server as long as it doesn't impact users browsing my website! Inbound connections should go through the domain name / registered public IP. Can I accomplish this with my single server with one or multiple NICs? Do I need multiple servers and set one up as a proxy? Please help as my background is in software and not networking, and I don't think I can accomplish this at a software level (e.g. Java). Thanks.

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• What happened to 'Copy Public Gallery Link' for folders in Photos in Dropbox?

  - by Transgenic

  I've been trying to figure out how to use the 'Photos' folder properly, but it does not seem to contain the functionality that is mentioned on various websites. From what I've read, you are supposed to create a folder within the 'Photos' folder. At that point, it becomes a public gallery for which you can access the context menu item Copy Public Gallery Link. However, I do not have this context menu item. I found a topic on the DropBox forum, but it is 2 years old. Even the various website information mentioned is over a year old. I found a topic from this year on SuperUser that mentions about the Share link menu item. I understand that this functionality is basically the same as Copy Public Gallery Link, however, the key difference is that it opens the website for which I need to click 'Copy link to this page' link, which then adds it to the clipboard. My primary questions are: Did they phase out the Copy Public Gallery Link from the context menu entirely? If not, is there a way to re-enable this menu item? If not, am I using the Photos folder properly? Lastly, if there is no way to get this menu item, is there some kind of script or hack-around that will let me simplify the Shark link + Copy link to this page functionality without requiring it to open my web browser? Note: I had to edit my post to remove other website links that I mention since I'm considered a 'New User' here and am only able to post 2 hyperlinks. Sorry.

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• WebGrid Helper and Complex Types

  - by imran_ku07

      Introduction:           WebGrid helper makes it very easy to show tabular data. It was originally designed for ASP.NET Web Pages(WebMatrix) to display, edit, page and sort tabular data but you can also use this helper in ASP.NET Web Forms and ASP.NET MVC. When using this helper, sometimes you may run into a problem if you use complex types in this helper. In this article, I will show you how you can use complex types in WebGrid helper.       Description:             Let's say you need to show the employee data and you have the following classes,   public class Employee { public string Name { get; set; } public Address Address { get; set; } public List<string> ContactNumbers { get; set; } } public class Address { public string City { get; set; } }               The Employee class contain a Name, an Address and list of ContactNumbers. You may think that you can easily show City in WebGrid using Address.City, but no. The WebGrid helper will throw an exception at runtime if any Address property is null in the Employee list. Also, you cannot directly show ContactNumbers property. The easiest way to show these properties is to add some additional properties,   public Address NotNullableAddress { get { return Address ?? new Address(); } } public string Contacts { get { return string.Join("; ",ContactNumbers); } }               Now you can easily use these properties in WebGrid. Here is the complete code of this example,  @functions{ public class Employee { public Employee(){ ContactNumbers = new List<string>(); } public string Name { get; set; } public Address Address { get; set; } public List<string> ContactNumbers { get; set; } public Address NotNullableAddress { get { return Address ?? new Address(); } } public string Contacts { get { return string.Join("; ",ContactNumbers); } } } public class Address { public string City { get; set; } } } @{ var myClasses = new List<Employee>{ new Employee { Name="A" , Address = new Address{ City="AA" }, ContactNumbers = new List<string>{"021-216452","9231425651"}}, new Employee { Name="C" , Address = new Address{ City="CC" }}, new Employee { Name="D" , ContactNumbers = new List<string>{"045-14512125","21531212121"}} }; var grid = new WebGrid(source: myClasses); } @grid.GetHtml(columns: grid.Columns( grid.Column("NotNullableAddress.City", header: "City"), grid.Column("Name"), grid.Column("Contacts")))                    Summary:           You can use WebGrid helper to show tabular data in ASP.NET MVC, ASP.NET Web Forms and  ASP.NET Web Pages. Using this helper, you can also show complex types in the grid. In this article, I showed you how you use complex types with WebGrid helper. Hopefully you will enjoy this article too.  

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• .NET remoting exception: Permission denied: cannot call non-public or static methods remotely.

  - by Vilx-

  I'm writing a program which will allow to load a specific managed .DLL file and play with it. Since I want the ability to unload the .DLL file, I'm creating two AppDomains - one for the app itself, the other for the currently loaded .DLL. Since most of the objects in the loaded .DLL do not serialize well, I'm creating a MarshalByRefObject wrapper class which will keep the object itself in its own AppDomain, and expose some reflection functions to the main application AppDomain. However when I try to invoke a method on the remote object I get stuck with an exception: Permission denied: cannot call non-public or static methods remotely. This is very strange, because I'm not using any non-public or static methods at all. In essence, what I have is: class RemoteObjectWrapper: MarshalByRefObject { private Type SourceType; private object Source; public RemoteObjectWrapper(object source) { if (source == null) throw new ArgumentNullException("source"); this.Source = source; this.SourceType = source.GetType(); } public T WrapValue<T>(object value) { if ( value == null ) return default(T); var TType = typeof(T); if (TType == typeof(RemoteObjectWrapper)) value = new RemoteObjectWrapper(value); return (T)value; } public T InvokeMethod<T>(string methodName, params object[] args) { return WrapValue<T>(SourceType.InvokeMember(methodName, System.Reflection.BindingFlags.FlattenHierarchy | System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Public, null, this.Source, args)); } } And I get the exception when I try to do: var c = SomeInstanceOfRemoteObjectWrapper.InvokeMethod<RemoteObjectWrapper>("somePublicMethod", "some string parameter"); What's going on here? As far as I can understand, the InvokeMethod method doesn't even get executed, the exception is thrown when I try to run it. Added: To clarify - SomeInstanceOfRemoteObjectWrapper is constructed in the .DLL's AppDomain and then returned to my main AppDomain, The InvokeMethod<T>() is called from my main AppDomain (and I expect it to execute in the .DLL's AppDomain).

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• Why does Microsoft advise against readonly fields with mutable values?

  - by Weeble

  In the Design Guidelines for Developing Class Libraries, Microsoft say: Do not assign instances of mutable types to read-only fields. The objects created using a mutable type can be modified after they are created. For example, arrays and most collections are mutable types while Int32, Uri, and String are immutable types. For fields that hold a mutable reference type, the read-only modifier prevents the field value from being overwritten but does not protect the mutable type from modification. This simply restates the behaviour of readonly without explaining why it's bad to use readonly. The implication appears to be that many people do not understand what "readonly" does and will wrongly expect readonly fields to be deeply immutable. In effect it advises using "readonly" as code documentation indicating deep immutability - despite the fact that the compiler has no way to enforce this - and disallows its use for its normal function: to ensure that the value of the field doesn't change after the object has been constructed. I feel uneasy with this recommendation to use "readonly" to indicate something other than its normal meaning understood by the compiler. I feel that it encourages people to misunderstand the meaning of "readonly", and furthermore to expect it to mean something that the author of the code might not intend. I feel that it precludes using it in places it could be useful - e.g. to show that some relationship between two mutable objects remains unchanged for the lifetime of one of those objects. The notion of assuming that readers do not understand the meaning of "readonly" also appears to be in contradiction to other advice from Microsoft, such as FxCop's "Do not initialize unnecessarily" rule, which assumes readers of your code to be experts in the language and should know that (for example) bool fields are automatically initialised to false, and stops you from providing the redundancy that shows "yes, this has been consciously set to false; I didn't just forget to initialize it". So, first and foremost, why do Microsoft advise against use of readonly for references to mutable types? I'd also be interested to know: Do you follow this Design Guideline in all your code? What do you expect when you see "readonly" in a piece of code you didn't write?

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• Why am I getting a permission denied error on my public folder?

  - by Robin Fisher

  Hi all, This one has got me stumped. I'm deploying a Rails 3 app to Slicehost running Apache 2 and Passenger. My server is running Ruby 1.9.1 using RVM. I am receiving a permission denied error on the "public" folder in my app. My Virtual Host is setup as follows: <VirtualHost *:80> ServerName sharerplane.com ServerAlias www.sharerplane.com ServerAlias *.sharerplane.com DocumentRoot /home/robinjfisher/public_html/sharerplane.com/current/public/ <Directory "/home/robinjfisher/public_html/sharerplane.com/public/"> AllowOverride all Options -MultiViews Order allow,deny Allow from all </Directory> PassengerDefaultUser robinjfisher </VirtualHost> I've tried the following things: trailing slash on public; no trailing slash on public; PassengerUserSwitching on and off; PassengerDefaultUser set and not set; with and without the block. The public folder is owned by robinjfisher:www-data and Passenger is running as robinjfisher so I can't see why there are permission issues. Does anybody have any thoughts? Thanks Robin PS. Have disabled the site for the time being to avoid indexing so what is there currently is not the site in question.

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• How to display objects with dynamic fields in wpf data grid?

  - by Oliver Hanappi

  Hi! I want to display and edit some objects in a WPF data grid and I'm looking for a good way to do so. All objects I want to display have the same fields, but every execution the fields of my objects can differ. Here is a piece of the interface to illustrate what I mean: public interface IMyObject { IEnumerable<string> GetFieldNames(); IEnumerable<Type> GetFieldTypes(); object GetField(string name); void SetField(string name, object value); } How can I generate a data grid which displays this kind of objects? I thought of XAML generation to define the columns, but I'm still facing the problem of accessing the fields. I think I could realize this with value converters, another option would be to dynamically create a type which exposes the dynamic fields with properties. Are there any other ways and which should I favor? I'm keen on hearing your opinions. Best Regards, Oliver Hanappi

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• ASP.NET how can access public properties of MasterPage from external Class ?

  - by eugeneK

  Why i can't access MasterPage's public property (MessagePlaceholder) from other Class (Errors) ? my master page code behind using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class MyMasterPage : System.Web.UI.MasterPage { public string MessagePlaceholder { get { return messagePlaceholder.InnerHtml; } set { messagePlaceholder.InnerHtml = value; } } protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { messagePlaceholder.InnerHtml = Errors.getMessage(); } } } my Errors Class public static string getMessage() { HttpContext c = HttpContext.Current; string messageType = ""; if (c.Session["errorMessage"] != null) { messageType = "errorMessage"; } else if (c.Session["successMessage"] != null) { messageType = "successMessage"; } if (!string.IsNullOrEmpty(messageType)) { StringBuilder userMessageSb = new StringBuilder(); userMessageSb.Append(string.Format("<div id=\"{0}\" title=\"{1}\">{2}</div>", messageType, messageType.Replace("Message",string.Empty), c.Session[messageType])); // fix so message will not re-appear c.Session.Remove(messageType); messageType = userMessageSb.ToString(); } return messageType; } public static void setSuccess(string successMessage, bool isRedirect) { HttpContext.Current.Session["successMessage"] = successMessage; } public static void setError(string errorMessage, bool isRedirect) { HttpContext.Current.Session["errorMessage"] = errorMessage; if (!isRedirect) { ((HttpContext.Current.CurrentHandler as System.Web.UI.Page).Master as MyMasterPage).MessagePlaceholder = getMessage(); } } this is how i set error if (true) { Errors.setError("this is an error demo", false); return; } or with redirect after error if (true) { Errors.setError("yet another error", true); Response.Redirect("~/error.aspx"); }

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• how can access public properties of MasterPage from external Class ?

  - by eugeneK

  Why i can't access MasterPage's public property (MessagePlaceholder) from other Class (Errors) ? Error compiler gives me is "Error 1 The type or namespace name 'MyMasterPage' could not be found (are you missing a using directive or an assembly reference?)" my master page code behind using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class MyMasterPage : System.Web.UI.MasterPage { public string MessagePlaceholder { get { return messagePlaceholder.InnerHtml; } set { messagePlaceholder.InnerHtml = value; } } protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { messagePlaceholder.InnerHtml = Errors.getMessage(); } } } my Errors Class public static string getMessage() { HttpContext c = HttpContext.Current; string messageType = ""; if (c.Session["errorMessage"] != null) { messageType = "errorMessage"; } else if (c.Session["successMessage"] != null) { messageType = "successMessage"; } if (!string.IsNullOrEmpty(messageType)) { StringBuilder userMessageSb = new StringBuilder(); userMessageSb.Append(string.Format("<div id=\"{0}\" title=\"{1}\">{2}</div>", messageType, messageType.Replace("Message",string.Empty), c.Session[messageType])); // fix so message will not re-appear c.Session.Remove(messageType); messageType = userMessageSb.ToString(); } return messageType; } public static void setSuccess(string successMessage, bool isRedirect) { HttpContext.Current.Session["successMessage"] = successMessage; } public static void setError(string errorMessage, bool isRedirect) { HttpContext.Current.Session["errorMessage"] = errorMessage; if (!isRedirect) { ((HttpContext.Current.CurrentHandler as System.Web.UI.Page).Master as MyMasterPage).MessagePlaceholder = getMessage(); } } this is how i set error if (true) { Errors.setError("this is an error demo", false); return; } or with redirect after error if (true) { Errors.setError("yet another error", true); Response.Redirect("~/error.aspx"); }

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• Java extends classes - Share the extended class fields within the super class.

  - by Bastan

  Straight to the point... I have a class public class P_Gen{ protected String s; protected Object oP_Gen; public P_Gen(String str){ s = str; oP_Gen = new Myclass(this); } } Extended class: public class P extends P_Gen{ protected Object oP; public P(String str){ oP = new aClass(str); super(str); } } MyClass: public class MyClass{ protected Object oMC; public MyClass(P extendedObject){ oMc = oP.getSomething(); } } I came to realize that MyClass can only be instantiated with (P_Gen thisObject) as opposed to (P extendedObject). The situation is that I have code generated a bunch of classes like P_Gen. For each of them I have generated a class P which would contains my P specific custom methods and fields. When I'll regenerate my code in the future, P would not be overwritten as P_Gen would. ** So what happened in my case???!!!... I realized that MyClass would beneficiate from the info stored in P in addition to only P_Gen. Would that possible? I know it's not JAVA "realistic" since another class that extends P_Gen might not have the same fields... BY DESIGN, P_Gen will not be extended by anything but P.... And that's where it kinda make sens. :-) at least in other programming language ;-) In other programming language, it seems like P_Gen.this === P.this, in other word, "this" becomes a combination of P and P_Gen. Is there a way to achieve this knowing that P_Gen won't be extended by anything than P?

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• Django: returning a selection of fields from a model based on their values?

  - by AP257

  I am working with some data over which I have little control. I'd like to return ONLY the fields of my model that aren't certain 'uninteresting' values (e.g. '0', 'X' or '-'), and access them individually in the template. My model is like this: class Manors(models.Model): structidx = models.IntegerField(primary_key=True, verbose_name="ID") hills = models.CharField(max_length=100, null=True, blank=True, verbose_name="Number of fields") In my template, I return a QuerySet of Manors, and I'd like to output something like this if the hills field isn't uninteresting: {% for manor in manors %} {% if manor.hills %}<li>Hills blah blah: {{ manor.hills }}</li>{% endif %} {% endfor %} I want to avoid too much logic in the template. Ideally, the manor object would simply not return with the uninteresting fields attached, then I could just do {% if manor.hills %}. I tried writing a model method that returns a dictionary of the interesting values, like this: def get_field_dictionary(self): interesting_fields = {} for field in Manors._meta.fields: if field.value_to_string(self) != "N" and field.value_to_string(self) != "0" and field.value_to_string(self) != "-" and field.value_to_string(self) != "X": interesting_fields[field.name] = field.value_to_string(self) return interesting_fields But I don't know how to access individual values of the dictionary in the template: {% if manor.get_field_dictionary['hills'] %}<li>Hills blah blah: {{ manor.get_field_dictionary['hills'] }}</li>{% endif %} gives a TemplateSyntaxError. Is there a better way to do this?

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• How to translate the fields of a database model?

  - by Tõnis M

  I have some tables/models in a web app that will have multilingual content. For example a university, with it's description in a default language(english) and the user wants he can see the same information in another language( if the object has it's fields translated). If there were only a few languages then I would just add fields like name_en and name_de and so on, but the number of languages isn't fixed, so that' would create a mess. I could also just create a new object with the translated data but then foreign keys wouldn't work, and only some of the fields can be translated so that would create duplicate data. Storing the translations in a file and using gettext or something similar is also not an option since the objects fields can be translated by the website user, not only developers/admins. What would be the best way to design/architect such a database? Searching from the translated data should also be not too complex - as it should not require creating complex joins which would make the queries slower I'm using PostgreSQL and Ruby of Rails but I'm not looking for a technical solution but for a general idea how to design it.

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