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  • Unbuffered subprocess output (last line missing)

    - by plok
    I must be overlooking something terribly obvious. I need to execute a C program, display its output in real time and finally parse its last line, which should be straightforward as the last line printed is always the same. process = subprocess.Popen(args, shell = True, stdout = subprocess.PIPE, stderr = subprocess.PIPE) # None indicates that the process hasn't terminated yet. while process.poll() is None: # Always save the last non-emtpy line that was output by the child # process, as it will write an empty line when closing its stdout. out = process.stdout.readline() if out: last_non_empty_line = out if verbose: sys.stdout.write(out) sys.stdout.flush() # Parse 'out' here... Once in a while, however, the last line is not printed. The default value for Popens's bufsize is 0, so it is supposed to be unbuffered. I have also tried, to no avail, adding fflush(stdout) to the C code just before exiting, but it seems that there is absolutely no need to flush a stream before exiting a program. Ideas anyone?

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  • ASP.NET MVC2 custom rolemanager (webconfig problem)

    - by ile
    Structure of the web: SAMembershipProvider.cs namespace User.Membership { public class SAMembershipProvider : MembershipProvider { #region - Properties - private int NewPasswordLength { get; set; } private string ConnectionString { get; set; } //private MachineKeySection MachineKey { get; set; } //Used when determining encryption key values. public bool enablePasswordReset { get; set; } public bool enablePasswordRetrieval { get; set; } public bool requiresQuestionAndAnswer { get; set; } public bool requiresUniqueEmail { get; set; } public int maxInvalidPasswordAttempts { get; set; } public int passwordAttemptWindow { get; set; } public MembershipPasswordFormat passwordFormat { get; set; } public int minRequiredNonAlphanumericCharacters { get; set; } public int minRequiredPasswordLength { get; set; } public string passwordStrengthRegularExpression { get; set; } public override string ApplicationName { get; set; } // Indicates whether passwords can be retrieved using the provider's GetPassword method. // This property is read-only. public override bool EnablePasswordRetrieval { get { return enablePasswordRetrieval; } } // Indicates whether passwords can be reset using the provider's ResetPassword method. // This property is read-only. public override bool EnablePasswordReset { get { return enablePasswordReset; } } // Indicates whether a password answer must be supplied when calling the provider's GetPassword and ResetPassword methods. // This property is read-only. public override bool RequiresQuestionAndAnswer { get { return requiresQuestionAndAnswer; } } public override int MaxInvalidPasswordAttempts { get { return maxInvalidPasswordAttempts; } } // For a description, see MaxInvalidPasswordAttempts. // This property is read-only. public override int PasswordAttemptWindow { get { return passwordAttemptWindow; } } // Indicates whether each registered user must have a unique e-mail address. // This property is read-only. public override bool RequiresUniqueEmail { get { return requiresUniqueEmail; } } public override MembershipPasswordFormat PasswordFormat { get { return passwordFormat; } } // The minimum number of characters required in a password. // This property is read-only. public override int MinRequiredPasswordLength { get { return minRequiredPasswordLength; } } // The minimum number of non-alphanumeric characters required in a password. // This property is read-only. public override int MinRequiredNonAlphanumericCharacters { get { return minRequiredNonAlphanumericCharacters; } } // A regular expression specifying a pattern to which passwords must conform. // This property is read-only. public override string PasswordStrengthRegularExpression { get { return passwordStrengthRegularExpression; } } #endregion #region - Methods - public override void Initialize(string name, NameValueCollection config) { throw new NotImplementedException(); } public override bool ChangePassword(string username, string oldPassword, string newPassword) { throw new NotImplementedException(); } public override bool ChangePasswordQuestionAndAnswer(string username, string password, string newPasswordQuestion, string newPasswordAnswer) { throw new NotImplementedException(); } // Takes, as input, a user name, password, e-mail address, and other information and adds a new user // to the membership data source. CreateUser returns a MembershipUser object representing the newly // created user. It also accepts an out parameter (in Visual Basic, ByRef) that returns a // MembershipCreateStatus value indicating whether the user was successfully created or, if the user // was not created, the reason why. If the user was not created, CreateUser returns null. // Before creating a new user, CreateUser calls the provider's virtual OnValidatingPassword method to // validate the supplied password. It then creates the user or cancels the action based on the outcome of the call. public override MembershipUser CreateUser(string username, string password, string email, string passwordQuestion, string passwordAnswer, bool isApproved, object providerUserKey, out MembershipCreateStatus status) { throw new NotImplementedException(); } public override bool DeleteUser(string username, bool deleteAllRelatedData) { throw new NotImplementedException(); } public override MembershipUserCollection FindUsersByEmail(string emailToMatch, int pageIndex, int pageSize, out int totalRecords) { throw new NotImplementedException(); } // Returns a MembershipUserCollection containing MembershipUser objects representing users whose user names // match the usernameToMatch input parameter. Wildcard syntax is data source-dependent. MembershipUser objects // in the MembershipUserCollection are sorted by user name. If FindUsersByName finds no matching users, it // returns an empty MembershipUserCollection. // For an explanation of the pageIndex, pageSize, and totalRecords parameters, see the GetAllUsers method. public override MembershipUserCollection FindUsersByName(string usernameToMatch, int pageIndex, int pageSize, out int totalRecords) { throw new NotImplementedException(); } // Returns a MembershipUserCollection containing MembershipUser objects representing all registered users. If // there are no registered users, GetAllUsers returns an empty MembershipUserCollection // The results returned by GetAllUsers are constrained by the pageIndex and pageSize input parameters. pageSize // specifies the maximum number of MembershipUser objects to return. pageIndex identifies which page of results // to return. Page indexes are 0-based. // // GetAllUsers also takes an out parameter (in Visual Basic, ByRef) named totalRecords that, on return, holds // a count of all registered users. public override MembershipUserCollection GetAllUsers(int pageIndex, int pageSize, out int totalRecords) { throw new NotImplementedException(); } // Returns a count of users that are currently online-that is, whose LastActivityDate is greater than the current // date and time minus the value of the membership service's UserIsOnlineTimeWindow property, which can be read // from Membership.UserIsOnlineTimeWindow. UserIsOnlineTimeWindow specifies a time in minutes and is set using // the <membership> element's userIsOnlineTimeWindow attribute. public override int GetNumberOfUsersOnline() { throw new NotImplementedException(); } // Takes, as input, a user name and a password answer and returns that user's password. If the user name is not // valid, GetPassword throws a ProviderException. // Before retrieving a password, GetPassword verifies that EnablePasswordRetrieval is true. If // EnablePasswordRetrieval is false, GetPassword throws a NotSupportedException. If EnablePasswordRetrieval is // true but the password format is hashed, GetPassword throws a ProviderException since hashed passwords cannot, // by definition, be retrieved. A membership provider should also throw a ProviderException from Initialize if // EnablePasswordRetrieval is true but the password format is hashed. // // GetPassword also checks the value of the RequiresQuestionAndAnswer property before retrieving a password. If // RequiresQuestionAndAnswer is true, GetPassword compares the supplied password answer to the stored password // answer and throws a MembershipPasswordException if the two don't match. GetPassword also throws a // MembershipPasswordException if the user whose password is being retrieved is currently locked out. public override string GetPassword(string username, string answer) { throw new NotImplementedException(); } // Takes, as input, a user name or user ID (the method is overloaded) and a Boolean value indicating whether // to update the user's LastActivityDate to show that the user is currently online. GetUser returns a MembershipUser // object representing the specified user. If the user name or user ID is invalid (that is, if it doesn't represent // a registered user) GetUser returns null (Nothing in Visual Basic). public override MembershipUser GetUser(object providerUserKey, bool userIsOnline) { throw new NotImplementedException(); } // Takes, as input, a user name or user ID (the method is overloaded) and a Boolean value indicating whether to // update the user's LastActivityDate to show that the user is currently online. GetUser returns a MembershipUser // object representing the specified user. If the user name or user ID is invalid (that is, if it doesn't represent // a registered user) GetUser returns null (Nothing in Visual Basic). public override MembershipUser GetUser(string username, bool userIsOnline) { throw new NotImplementedException(); } // Takes, as input, an e-mail address and returns the first registered user name whose e-mail address matches the // one supplied. // If it doesn't find a user with a matching e-mail address, GetUserNameByEmail returns an empty string. public override string GetUserNameByEmail(string email) { throw new NotImplementedException(); } // Virtual method called when a password is created. The default implementation in MembershipProvider fires a // ValidatingPassword event, so be sure to call the base class's OnValidatingPassword method if you override // this method. The ValidatingPassword event allows applications to apply additional tests to passwords by // registering event handlers. // A custom provider's CreateUser, ChangePassword, and ResetPassword methods (in short, all methods that record // new passwords) should call this method. protected override void OnValidatingPassword(ValidatePasswordEventArgs e) { base.OnValidatingPassword(e); } // Takes, as input, a user name and a password answer and replaces the user's current password with a new, random // password. ResetPassword then returns the new password. A convenient mechanism for generating a random password // is the Membership.GeneratePassword method. // If the user name is not valid, ResetPassword throws a ProviderException. ResetPassword also checks the value of // the RequiresQuestionAndAnswer property before resetting a password. If RequiresQuestionAndAnswer is true, // ResetPassword compares the supplied password answer to the stored password answer and throws a // MembershipPasswordException if the two don't match. // // Before resetting a password, ResetPassword verifies that EnablePasswordReset is true. If EnablePasswordReset is // false, ResetPassword throws a NotSupportedException. If the user whose password is being changed is currently // locked out, ResetPassword throws a MembershipPasswordException. // // Before resetting a password, ResetPassword calls the provider's virtual OnValidatingPassword method to validate // the new password. It then resets the password or cancels the action based on the outcome of the call. If the new // password is invalid, ResetPassword throws a ProviderException. // // Following a successful password reset, ResetPassword updates the user's LastPasswordChangedDate. public override string ResetPassword(string username, string answer) { throw new NotImplementedException(); } // Unlocks (that is, restores login privileges for) the specified user. UnlockUser returns true if the user is // successfully unlocked. Otherwise, it returns false. If the user is already unlocked, UnlockUser simply returns true. public override bool UnlockUser(string userName) { throw new NotImplementedException(); } // Takes, as input, a MembershipUser object representing a registered user and updates the information stored for // that user in the membership data source. If any of the input submitted in the MembershipUser object is not valid, // UpdateUser throws a ProviderException. // Note that UpdateUser is not obligated to allow all the data that can be encapsulated in a MembershipUser object to // be updated in the data source. public override void UpdateUser(MembershipUser user) { throw new NotImplementedException(); } // Takes, as input, a user name and a password and verifies that they are valid-that is, that the membership data // source contains a matching user name and password. ValidateUser returns true if the user name and password are // valid, if the user is approved (that is, if MembershipUser.IsApproved is true), and if the user isn't currently // locked out. Otherwise, it returns false. // Following a successful validation, ValidateUser updates the user's LastLoginDate and fires an // AuditMembershipAuthenticationSuccess Web event. Following a failed validation, it fires an // // AuditMembershipAuthenticationFailure Web event. public override bool ValidateUser(string username, string password) { throw new NotImplementedException(); //if (string.IsNullOrEmpty(password.Trim())) return false; //string hash = EncryptPassword(password); //User user = _repository.GetByUserName(username); //if (user == null) return false; //if (user.Password == hash) //{ // User = user; // return true; //} //return false; } #endregion /// <summary> /// Procuses an MD5 hash string of the password /// </summary> /// <param name="password">password to hash</param> /// <returns>MD5 Hash string</returns> protected string EncryptPassword(string password) { //we use codepage 1252 because that is what sql server uses byte[] pwdBytes = Encoding.GetEncoding(1252).GetBytes(password); byte[] hashBytes = System.Security.Cryptography.MD5.Create().ComputeHash(pwdBytes); return Encoding.GetEncoding(1252).GetString(hashBytes); } } // End Class } SARoleProvider.cs namespace User.Membership { public class SARoleProvider : RoleProvider { #region - Properties - // The name of the application using the role provider. ApplicationName is used to scope // role data so that applications can choose whether to share role data with other applications. // This property can be read and written. public override string ApplicationName { get; set; } #endregion #region - Methods - public override void Initialize(string name, NameValueCollection config) { throw new NotImplementedException(); } // Takes, as input, a list of user names and a list of role names and adds the specified users to // the specified roles. // AddUsersToRoles throws a ProviderException if any of the user names or role names do not exist. // If any user name or role name is null (Nothing in Visual Basic), AddUsersToRoles throws an // ArgumentNullException. If any user name or role name is an empty string, AddUsersToRoles throws // an ArgumentException. public override void AddUsersToRoles(string[] usernames, string[] roleNames) { throw new NotImplementedException(); } // Takes, as input, a role name and creates the specified role. // CreateRole throws a ProviderException if the role already exists, the role name contains a comma, // or the role name exceeds the maximum length allowed by the data source. public override void CreateRole(string roleName) { throw new NotImplementedException(); } // Takes, as input, a role name and a Boolean value that indicates whether to throw an exception if there // are users currently associated with the role, and then deletes the specified role. // If the throwOnPopulatedRole input parameter is true and the specified role has one or more members, // DeleteRole throws a ProviderException and does not delete the role. If throwOnPopulatedRole is false, // DeleteRole deletes the role whether it is empty or not. // // When DeleteRole deletes a role and there are users assigned to that role, it also removes users from the role. public override bool DeleteRole(string roleName, bool throwOnPopulatedRole) { throw new NotImplementedException(); } // Takes, as input, a search pattern and a role name and returns a list of users belonging to the specified role // whose user names match the pattern. Wildcard syntax is data-source-dependent and may vary from provider to // provider. User names are returned in alphabetical order. // If the search finds no matches, FindUsersInRole returns an empty string array (a string array with no elements). // If the role does not exist, FindUsersInRole throws a ProviderException. public override string[] FindUsersInRole(string roleName, string usernameToMatch) { throw new NotImplementedException(); } // Returns the names of all existing roles. If no roles exist, GetAllRoles returns an empty string array (a string // array with no elements). public override string[] GetAllRoles() { throw new NotImplementedException(); } // Takes, as input, a user name and returns the names of the roles to which the user belongs. // If the user is not assigned to any roles, GetRolesForUser returns an empty string array // (a string array with no elements). If the user name does not exist, GetRolesForUser throws a // ProviderException. public override string[] GetRolesForUser(string username) { throw new NotImplementedException(); //User user = _repository.GetByUserName(username); //string[] roles = new string[user.Role.Rights.Count + 1]; //roles[0] = user.Role.Description; //int idx = 0; //foreach (Right right in user.Role.Rights) // roles[++idx] = right.Description; //return roles; } public override string[] GetUsersInRole(string roleName) { throw new NotImplementedException(); } // Takes, as input, a role name and returns the names of all users assigned to that role. // If no users are associated with the specified role, GetUserInRole returns an empty string array (a string array with // no elements). If the role does not exist, GetUsersInRole throws a ProviderException. public override bool IsUserInRole(string username, string roleName) { throw new NotImplementedException(); //User user = _repository.GetByUserName(username); //if (user != null) // return user.IsInRole(roleName); //else // return false; } // Takes, as input, a list of user names and a list of role names and removes the specified users from the specified roles. // RemoveUsersFromRoles throws a ProviderException if any of the users or roles do not exist, or if any user specified // in the call does not belong to the role from which he or she is being removed. public override void RemoveUsersFromRoles(string[] usernames, string[] roleNames) { throw new NotImplementedException(); } // Takes, as input, a role name and determines whether the role exists. public override bool RoleExists(string roleName) { throw new NotImplementedException(); } #endregion } // End Class } From Web.config: <membership defaultProvider="SAMembershipProvider" userIsOnlineTimeWindow="15"> <providers> <clear/> <add name="SAMembershipProvider" type="User.Membership.SAMembershipProvider, User" /> </providers> </membership> <roleManager defaultProvider="SARoleProvider" enabled="true" cacheRolesInCookie="true"> <providers> <clear/> <add name="SARoleProvider" type="User.Membership.SARoleProvider" /> </providers> </roleManager> When running project, I get following error: Server Error in '/' Application. Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: The method or operation is not implemented. Source Error: Line 71: <providers> Line 72: <clear/> Line 73: <add name="SARoleProvider" type="User.Membership.SARoleProvider" /> Line 74: </providers> Line 75: </roleManager> I tried: <add name="SARoleProvider" type="User.Membership.SARoleProvider, User" /> and <add name="SARoleProvider" type="User.Membership.SARoleProvider, SARoleProvider" /> and <add name="SARoleProvider" type="User.Membership.SARoleProvider, User.Membership" /> but none works Any idea what's wrong here? Thanks, Ile

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  • hibernate column uniqueness question

    - by Seth
    I'm still in the process of learning hibernate/hql and I have a question that's half best practices question/half sanity check. Let's say I have a class A: @Entity public class A { @Id @GeneratedValue(strategy=GenerationType.AUTO) private Long id; @Column(unique=true) private String name = ""; //getters, setters, etc. omitted for brevity } I want to enforce that every instance of A that gets saved has a unique name (hence the @Column annotation), but I also want to be able to handle the case where there's already an A instance saved that has that name. I see two ways of doing this: 1) I can catch the org.hibernate.exception.ConstraintViolationException that could be thrown during the session.saveOrUpdate() call and try to handle it. 2) I can query for existing instances of A that already have that name in the DAO before calling session.saveOrUpdate(). Right now I'm leaning towards approach 2, because in approach 1 I don't know how to programmatically figure out which constraint was violated (there are a couple of other unique members in A). Right now my DAO.save() code looks roughly like this: public void save(A a) throws DataAccessException, NonUniqueNameException { Session session = sessionFactory.getCurrentSession(); try { session.beginTransaction(); Query query = null; //if id isn't null, make sure we don't count this object as a duplicate if(obj.getId() == null) { query = session.createQuery("select count(a) from A a where a.name = :name").setParameter("name", obj.getName()); } else { query = session.createQuery("select count(a) from A a where a.name = :name " + "and a.id != :id").setParameter("name", obj.getName()).setParameter("name", obj.getName()); } Long numNameDuplicates = (Long)query.uniqueResult(); if(numNameDuplicates > 0) throw new NonUniqueNameException(); session.saveOrUpdate(a); session.getTransaction().commit(); } catch(RuntimeException e) { session.getTransaction().rollback(); throw new DataAccessException(e); //my own class } } Am I going about this in the right way? Can hibernate tell me programmatically (i.e. not as an error string) which value is violating the uniqueness constraint? By separating the query from the commit, am I inviting thread-safety errors, or am I safe? How is this usually done? Thanks!

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  • DropDownList not updating value

    - by annelie
    Hello, I posted a question earlier but have another problem after making those changes. The previous thread can be found here: http://stackoverflow.com/questions/2700028/binding-a-dropdownlist-inside-a-detailsview Basically, I've got a dropdownlist that's dynamically populated with a list of regions. It selects the correct region when viewing the dropdown, but when I try to edit it changes the value to null. I think it might be because it doesn't know which field to update. Previously, when the dropdown list was hardcoded, I had SelectedValue='<%# Bind("region_id")%' set on the dropdown list, and when I updated it worked fine. However, I had to move the setting of the selected value into the code behind and now it just gets set to null every time I update. Here's the aspx code: <asp:DetailsView id="DetailsView1" runat="server" AutoGenerateRows="false" DataSourceID="myMySqlDataSrc" DataKeyNames="id" AutoGenerateDeleteButton="True" AutoGenerateEditButton="True" AutoGenerateInsertButton="False" OnDataBound="DetailsView1_DataBound" > <Fields> <snip> <asp:TemplateField HeaderText="Region"> <ItemTemplate><%# Eval("region_name") %></ItemTemplate> <EditItemTemplate> <asp:DropDownList ID="RegionDropdownList" runat="server"> </asp:DropDownList> </EditItemTemplate> </asp:TemplateField> </Fields> </asp:DetailsView> And here's the code behind: protected void DetailsView1_DataBound(object sender, EventArgs e) { ArrayList regionsList = BPBusiness.getRegions(); if (DetailsView1.CurrentMode == DetailsViewMode.Edit) { DropDownList ddlRegions = (DropDownList)DetailsView1.FindControl("RegionDropdownList"); if (ddlRegions != null) { ddlRegions.DataSource = regionsList; ddlRegions.DataValueField = "Value"; ddlRegions.DataTextField = "Text"; ddlRegions.DataBind(); if (ddlRegions.Items.Contains(ddlRegions.Items.FindByValue(objBusiness.iRegionID.ToString()))) { ddlRegions.SelectedIndex = ddlRegions.Items.IndexOf(ddlRegions.Items.FindByValue(objBusiness.iRegionID.ToString())); } } } } EDIT: The database is MySql, and the update statement looks like this: myMySqlDataSrc.UpdateCommand = "UPDATE myTable SET business_name = ?, addr_line_1 = ?, addr_line_2 = ?, addr_line_3 = ?, postcode = ?, county = ?, town_city = ?, tl_url = ?, customer_id = ?, region_id = ?, description = ?, approval_status = ?, tl_user_name = ?, phone = ?, uploaders_own = ? WHERE id = ?"; Thanks, Annelie

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  • TreeMap not properly returning values

    - by smessing
    I have the following TreeMap: TreeMap<String, Integer> distances = new TreeMap<String, Integer>(); and it contains both strings, "Face" and "Foo", with appropriate values, such that: System.out.println(distances); Yields: {Face=12, Foo=2} However, distances.get(Face) returns null, even though distances.get(Foo) properly returns 2. Previously, distances.get(Face) worked, but for some reason, it stopped working. Note I print out the map right before calling get() for both keys, so I haven't accidentally changed Face's value to null. Has anyone else every encountered this problem? Is there anything I can do? I'm having a terrible time simply trying to figure out how to debug this problem.

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  • F# pattern matching

    - by Roger Alsing
    What would be the most effective way to express the following code? match cond.EvalBool() with | true -> match body.Eval() with | :? ControlFlowModifier as e -> match e with | Break(scope) -> e :> obj //Break is a DU element of ControlFlowModifier | _ -> next() //other members of CFM should call next() | _ -> next() | false -> null cond.EvalBool returns a boolean result where false should return null and true should either run the entire block again (its wrapped in a func called next) or if the special value of break is found, then the loop should exit and return the break value. Is there any way to compress that block of code to something smaller?

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  • Finding and changing currencies using Greasemonkey

    - by Noam Smadja
    It doesnt find nor replaces the strings.. may be wrong regex? // ==UserScript== // @name CurConvertor // @namespace CurConvertor // @description noam smadja // @include http://www.zavvi.com/* // ==/UserScript== textNodes = document.evaluate( "//text()", document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null); var searchRE = new RegExp('\d\d.\d\d','gi'); var replace = searchRE*5.67; for (var i=0;i<textNodes.snapshotLength;i++) { var node = textNodes.snapshotItem(i); node.data = node.data.replace(searchRE, replace); i wrote this, but its not doing a think. even when i change the string in the regex to a string in the webpage it still does nothing.. what am i missing? :)

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  • Take screenshot of DirectX full-screen application

    - by iconiK
    This boggles me. DirectX bypasses everything and talks directly to the device driver, thus GDI and other usual methods won't work - unless Aero is disabled (or unavailable), all that appears is a black rectangle at the top left of the screen. I have tried what other have suggested on several forums, using DirectX to get the back buffer and save it, but I get the same result: device-GetFrontBufferData(0, surface); D3DXSaveSurfaceToFile("fileName", D3DXIFF_BMP, surface, NULL, NULL); Is there any way to get a screenshot of another full-screen DirectX application when Aero is enabled?

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  • How to write this Linq SQL as a Dynamic Query (using strings)?

    - by Dr. Zim
    Skip to the "specific question" as needed. Some background: The scenario: I have a set of products with a "drill down" filter (Query Object) populated with DDLs. Each progressive DDL selection will further limit the product list as well as what options are left for the DDLs. For example, selecting a hammer out of tools limits the Product Sizes to only show hammer sizes. Current setup: I created a query object, sent it to a repository, and fed each option to a SQL "table valued function" where null values represent "get all products". I consider this a good effort, but far from DDD acceptable. I want to avoid any "programming" in SQL, hopefully doing everything with a repository. Comments on this topic would be appreciated. Specific question: How would I rewrite this query as a Dynamic Query? A link to something like 101 Linq Examples would be fantastic, but with a Dynamic Query scope. I really want to pass to this method the field in quotes "" for which I want a list of options and how many products have that option. from p in db.Products group p by p.ProductSize into g select new Category { PropertyType = g.Key, Count = g.Count() } Each DDL option will have "The selection (21)" where the (21) is the quantity of products that have that attribute. Upon selecting an option, all other remaining DDLs will update with the remaining options and counts. Edit: Additional notes: .OrderBy("it.City") // "it" refers to the entire record .GroupBy("City", "new(City)") // This produces a unique list of City .Select("it.Count()") //This gives a list of counts... getting closer .Select("key") // Selects a list of unique City .Select("new (key, count() as string)") // +1 to me LOL. key is a row of group .GroupBy("new (City, Manufacturer)", "City") // New = list of fields to group by .GroupBy("City", "new (Manufacturer, Size)") // Second parameter is a projection Product .Where("ProductType == @0", "Maps") .GroupBy("new(City)", "new ( null as string)")// Projection not available later? .Select("new (key.City, it.count() as string)")// GroupBy new makes key an object Product .Where("ProductType == @0", "Maps") .GroupBy("new(City)", "new ( null as string)")// Projection not available later? .Select("new (key.City, it as object)")// the it object is the result of GroupBy var a = Product .Where("ProductType == @0", "Maps") .GroupBy("@0", "it", "City") // This fails to group Product at all .Select("new ( Key, it as Product )"); // "it" is property cast though What I have learned so far is LinqPad is fantastic, but still looking for an answer. Eventually, completely random research like this will prevail I guess. LOL. Edit:

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  • How do I close a database connection in a WCF service?

    - by Dan
    I have been unable to find any documentation on properly closing database connections in WCF service operations. I have a service that returns a streamed response through the following method. public virtual Message GetData() { string sqlString = BuildSqlString(); SqlConnection conn = Utils.GetConnection(); SqlCommand cmd = new SqlCommand(sqlString, conn); XmlReader xr = cmd.ExecuteXmlReader(); Message msg = Message.CreateMessage( OperationContext.Current.IncomingMessageVersion, GetResponseAction(), xr); return msg; } I cannot close the connection within the method or the streaming of the response message will be terminated. Since control returns to the WCF system after the completion of that method, I don't know how I can close that connection afterwards. Any suggestions or pointers to additional documentation would be appreciated. Dan

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  • CLOB WRITE WITH OO4O

    - by Maagne Larsen
    I get the error : OIP-04908: This operation is not permitted on a Null LOB when Set MyClOB_0 = lOraDynaset_0.Fields("FILE_BODY").Value lOraDynaset_0.Edit amount_written = MyClOB_0.Write(buffer, chunksize, ORALOB_FIRST_PIECE)

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  • How to resolve this very heavy query that slows down the application?

    - by Juan Paredes
    Hi, We have a web application running in a production enviroment and at some point the client complained about how slow the application got. When we checked what was going on with the application and the database we discover this "precious" query that was being executed by several users at the same time (thus inflicting a extremely high load on the database server): SELECT NULL AS table_cat, o.owner AS table_schem, o.object_name AS table_name, o.object_type AS table_type, NULL AS remarks FROM all_objects o WHERE o.owner LIKE :1 ESCAPE :"SYS_B_0" AND o.object_name LIKE :2 ESCAPE :"SYS_B_1" AND o.object_type IN(:"SYS_B_2", :"SYS_B_3") ORDER BY table_type, table_schem, table_name Our application does not execute this query, I believe it is an Hibernate internal query. I've found little information on why Hibernate does this extremely heavy query, so any help is very much appreciated! The production enviroment information: Red Hat Enterprise Linux 5.3 (Tikanga), JDK 1.5, web container OC4J (whitin Oracle Application Server), Oracle Database 10g Release 10.0.0.1, JDBC Driver for JDK 1.2 and 1.3, Hibernate version 3.2.6.ga. Thank you.

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  • c++ smtp connection state - starttls

    - by Jackell
    Hi all! I am using openssl to build secure smtp connections to gmail.com:25. So I can successfully connect to the server and sends a command STARTTLS (I receive 220 2.0.0 Ready to start TLS). Then execute the following code without disconnecting: SSL_METHOD* method = NULL; SSL_library_init(); SSL_load_error_strings(); method = SSLv23_client_method(); ctx = SSL_CTX_new(method); if (ctx == NULL) { ERR_print_errors_fp(stderr); } SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2); ssl = SSL_new(ctx); if (!SSL_set_fd(ssl, socket)) { ERR_print_errors_fp(stderr); return; } if (ssl) { if (SSL_connect((SSL*)ssl) < 1) { ERR_print_errors_fp(stderr); } // then i think i need to send EHLO } But after calling SSL_connect I get an error: 24953:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:s23_clnt.c:601: Why? What I do wrong?

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  • Strange PHP reference bug

    - by Roland Soós
    Hello, I have a really strange bug with my PHP code. I have a recursive code which build up a menu tree with object and one of my customers server can't make it work. Contructor: function Menu(&$menus, &$keys , &$parent, &$menu){ ... if($keys === NULL){ $keys = array_keys($menus); } ... for($x = 0; $x < count($keys); $x++) { var_dump($keys); $menu = $menus[$keys[$x]]; var_dump($keys); if($this->id == $menu->pid){ $keys[$x] = NULL; $this->submenus[] = new Menu($menus, $keys, $this, $menu); } } First var_dump give me back the array, the second give back the first element of $menus. Do you have any idea what causes this? PHP version 5.2.3

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  • When I make a database change, how do I know what needs to be removed and readded to the LinqToSql O

    - by Michael Maddox
    For example, I alter a column in a table to be not null from null. I need to then delete and readd the table. That part is pretty clear. What about views, functions, and stored procedures that access the table, especially that column in the table? I've tried running diffs against the files generated by SQLMetal with some limited success, but even with that it's fairly unclear. I know there is at least one commercial tool out there that claims to address this problem, but I am looking for something free. How are people dealing with this issue?

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  • SQL UPDATE order of evaluation

    - by pilcrow
    What is the order of evaluation in the following query: UPDATE tbl SET q = q + 1, p = q; That is, will "tbl"."p" be set to q or q + 1? Is order of evaluation here governed by SQL standard? Thanks. UPDATE After considering Migs' answer, I ran some tests on all DBs I could find. While I don't know what the standard says, implementations vary. Given CREATE TABLE tbl (p INT NOT NULL, q INT NOT NULL); INSERT INTO tbl VALUES (1, 5); -- p := 1, q := 5 UPDATE tbl SET q = q + 1, p = q; I found the values of "p" and "q" were: database p q -----------------+---+--- Firebird 2.1.3 | 6 | 6 InterBase 2009 | 5 | 6 MySQL 5.0.77 | 6 | 6 Oracle XE (10g) | 5 | 6 PostgreSQL 8.4.2 | 5 | 6

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  • Android - How to scan Access Points and select strongest signal?

    - by Donal Rafferty
    I am currently trying to write a class in Android that will Scan for access points, calculate which access point has the best signal and then connect to that access point. So the application will be able to scan on the move and attach to new access points on the go. I have the scanning and calculation of the best signal working. But when it comes to attaching to the best access point I am having trouble. It appears that enableNetwork(netid, othersTrueFalse) is the only method for attaching to an Access point but this causes problems as from my Scan Results I am not able to get the id of the access point with the strongest signal. This is my code: public void doWifiScan(){ scanTask = new TimerTask() { public void run() { handler.post(new Runnable() { public void run() { sResults = wifiManager.scan(getBaseContext()); if(sResults!=null) Log.d("TIMER", "sResults count" + sResults.size()); ScanResult scan = wifiManager.calculateBestAP(sResults); wifiManager.addNewAccessPoint(scan); } }); }}; t.schedule(scanTask, 3000, 30000); } public ScanResult calculateBestAP(List<ScanResult> sResults){ ScanResult bestSignal = null; for (ScanResult result : sResults) { if (bestSignal == null || WifiManager.compareSignalLevel(bestSignal.level, result.level) < 0) bestSignal = result; } String message = String.format("%s networks found. %s is the strongest. %s is the bsid", sResults.size(), bestSignal.SSID, bestSignal.BSSID); Log.d("sResult", message); return bestSignal; } public void addNewAccessPoint(ScanResult scanResult){ WifiConfiguration wc = new WifiConfiguration(); wc.SSID = '\"' + scanResult.SSID + '\"'; //wc.preSharedKey = "\"password\""; wc.hiddenSSID = true; wc.status = WifiConfiguration.Status.ENABLED; wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); wc.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); wc.allowedProtocols.set(WifiConfiguration.Protocol.RSN); int res = mainWifi.addNetwork(wc); Log.d("WifiPreference", "add Network returned " + res ); boolean b = mainWifi.enableNetwork(res, false); Log.d("WifiPreference", "enableNetwork returned " + b ); } When I try to use addNewAccessPoint(ScanResult scanResult) it just adds another AP to the list in the settings application with the same name as the one with the best signal, so I end up with loads of duplicates and not actually attaching to them. Can anyone point me in the direction of a better solution?

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  • F# Silverlight 3.0 Custom Control Property throws: NullReferenceException

    - by akaphenom
    A new issue since my previous post. I am having some issues with the properties of the control in my Control Class I havse defined: static member ItemsProperty : DependencyProperty = DependencyProperty.Register( "Items", typeof<MyMenuItemCollection>, typeof<MyMenu>, null); member this.Items with get () : MyMenuItemCollection = this.GetValue(MyMenu.ItemsProperty) :?> MyMenuItemCollection and set (value: MyMenuItemCollection) = this.SetValue(MyMenu.ItemsProperty, value); The problem occurs on access: for menuItem in this.Items do let contentElement: FrameworkElement = menuItem.Content where I get a null referce exception on this.Items; 'Items' threw an exception of type 'System.NullReferenceException' Immediately after I initialized in the constructor: do this.Items <- new CoolMenuItemCollection()

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  • Setting a value through reflection is not working.

    - by Scott Chamberlain
    I am trying to set a value through reflection. I created this little test program struct headerIndexes { public int AccountNum{ get; set; } public int other { get; set; } public int items { get; set; } } static void Main(string[] args) { headerIndexes headers = new headerIndexes(); headers.AccountNum = 1; Console.WriteLine("Old val: {0}", headers.AccountNum); foreach (var s in headers.GetType().GetProperties()) { if (s.Name == "AccountNum") s.SetValue(headers, 99, null); } Console.WriteLine("New val: {0}", headers.AccountNum); Console.ReadKey(); } Steping thorugh the program i see it correctly does the command s.SetValue(headers, 99, null); however the value of headers.AccountNum stays at 1 when setValue is run. Am I missing a obvious step?

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  • How to run PowerShell scripts via automation without running into Host issues

    - by Scott Weinstein
    I'm looking to run some powershell scripts via automation. Something like: IList errors; Collection<PSObject> res = null; using (RunspaceInvoke rsi = new RunspaceInvoke()) { try { res = rsi.Invoke(commandline, null, out errors); } catch (Exception ex) { LastErrorMessage = ex.ToString(); Debug.WriteLine(LastErrorMessage); return 1; } } the problem I'm facing is that if my script uses cmdlets such as write-host the above throws an System.Management.Automation.CmdletInvocationException - Cannot invoke this function because the current host does not implement it. What are some good options for getting around this problem?

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  • Subclassing a window from a thread in c#

    - by user258651
    I'm creating a thread that looks for a window. When it finds the window, it overrides its windowproc, and handles WM_COMMAND and WM_CLOSE. Here's the code that looks for the window and subclasses it: public void DetectFileDialogProc() { Window fileDialog = null; // try to find the dialog twice, with a delay of 500 ms each time for (int attempts = 0; fileDialog == null && attempts < 2; attempts++) { // FindDialogs enumerates all windows of class #32770 via an EnumWindowProc foreach (Window wnd in FindDialogs(500)) { IntPtr parent = NativeMethods.User32.GetParent(wnd.Handle); if (parent != IntPtr.Zero) { // we're looking for a dialog whose parent is a dialog as well Window parentWindow = new Window(parent); if (parentWindow.ClassName == NativeMethods.SystemWindowClasses.Dialog) { fileDialog = wnd; break; } } } } // if we found the dialog if (fileDialog != null) { OldWinProc = NativeMethods.User32.GetWindowLong(fileDialog.Handle, NativeMethods.GWL_WNDPROC); NativeMethods.User32.SetWindowLong(fileDialog.Handle, NativeMethods.GWL_WNDPROC, Marshal.GetFunctionPointerForDelegate(new WindowProc(WndProc)).ToInt32()); } } And the windowproc: public IntPtr WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam) { lock (this) { if (!handled) { if (msg == NativeMethods.WM_COMMAND || msg == NativeMethods.WM_CLOSE) { // adding to a list. i never access the window via the hwnd from this list, i just treat it as a number _addDescriptor(hWnd); handled = true; } } } return NativeMethods.User32.CallWindowProc(OldWinProc, hWnd, msg, wParam, lParam); } This all works well under normal conditions. But I am seeing two instances of bad behavior in order of badness: If I do not close the dialog within a minute or so, the app crashes. Is this because the thread is getting garbage collected? This would kind of make sense, as far as GC can tell the thread is done? If this is the case, (and I don't know that it is), how can I make the thread stay around as long as the dialog is around? If I immediately close the dialog with the 'X' button (WM_CLOSE) the app crashes. I believe its crashing in the windowproc, but I can't get a breakpoint in there. I'm getting an AccessViolationException, The exception says "Attempted to read or write protected memory. This is often an indication that other memory is corrupt." Its a race condition, but of what I don't know. FYI, I had been reseting the old windowproc once I processed the commands, but that was crashing even more often! Any ideas on how I can solve these issues?

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  • DbDataReader with DbTransactions

    - by Gustavo Paulillo
    Its the wrong way or lack of performance, using DbDataReader combinated with DbTransactions? An example of code: public DbDataReader ExecuteReader() { try { if (this._baseConnection.State == ConnectionState.Closed) this._baseConnection.Open(); if (this._baseCommand.Transaction != null) return this._baseCommand.ExecuteReader(); return this._baseCommand.ExecuteReader(CommandBehavior.CloseConnection); } catch (Exception excp) { if (this._baseCommand.Transaction != null) this._baseCommand.Transaction.Rollback(); this._baseCommand.CommandText = string.Empty; this._baseConnection.Close(); throw new Exception(excp.Message); } } Some methods call this operation. Sometimes openning a DbTransaction. Its using DbConnection and DbCommand. The real problem, is in production enviroment (like 5,000 access/day) the ADO operations start throwing exceptions

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  • How do I create a foreign key in SQL Server?

    - by mmattax
    I have never "hand coded" creation code for SQL Server and foreign key deceleration is seemingly different from SQL Server and Postgres...here is my sql so far: drop table exams; drop table question_bank; drop table anwser_bank; create table exams ( exam_id uniqueidentifier primary key, exam_name varchar(50), ); create table question_bank ( question_id uniqueidentifier primary key, question_exam_id uniqueidentifier not null, question_text varchar(1024) not null, question_point_value decimal, constraint question_exam_id foreign key references exams(exam_id) ); create table anwser_bank ( anwser_id uniqueidentifier primary key, anwser_question_id uniqueidentifier, anwser_text varchar(1024), anwser_is_correct bit ); when I run the query I get this error: Msg 8139, Level 16, State 0, Line 9 Number of referencing columns in foreign key differs from number of referenced columns, table 'question_bank'. Can you spot the error? thanks.

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  • Making an Ajax request to a page method in ASP.NET MVC 2

    - by JLago
    I'm trying to call a page method belonging to a MVC Controller from another site, by means of: $.ajax({ type: "GET", url: "http://localhost:54953/Home/ola", data: "", contentType: "application/json; charset=utf-8", dataType: "json", success: function(data) { console.log(data.Name); } }); the method code is as follows, really simple, just to test: public ActionResult ola() { return Json(new ActionInfo() { Name = "ola" },JsonRequestBehavior.AllowGet); } I've seen this aproach being suggested here, and I actually like it a lot, should it work... When I run this, firebug gets a 200 OK, but the data received is null. I've tried a lot of different approaches, like having the data in text (wish grants me "(an empty string)" instead of just "null") or returning string in the server method... Can you tell me what am I doing wrong? Thank you in advance, João

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  • database importing problem with sql server

    - by tibin mathew
    Hi, I have a database working in mu local sql server 2005 express edition. I have to import my local dtabase to a remote servr database. For that i established connection to that remote server, and i can now see that database . but when i tried to restore database fro my local machine i'm getting an error message when i tried to give backup file location. Below is the error message The EXECUTE permission was denied on the object 'xp_availablemedia', database 'mssqlsystemresource', schema 'sys'. The user does not have permission to perform this action. The statement has been terminated. (Microsoft SQL Server, Error: 229) waht is the problem, how can i solve this. Please help me

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