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• Waiting for multiple asynchronous events in GWT

  - by TheDon

  I have two asynchronous events that return some data, and I would like to use both pieces of data to call an API. Is there an accepted practice for making the synchronization happen?

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• Lambda returning another lambda

  - by Yossarian

  Hello, is there any way how to return lambda from another lambda recursively? All I want to do is finite state machine, implemented as lambda, which returns lambda implementing another state (or null). nesting Func< won't work as I want. C#, .NET 3.5

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• Python Ctypes Read/WriteProcessMemory() - Error 5/998 Help!

  - by user299805

  Please don't get scared but the following code, if you are familiar with ctypes or C it should be easy to read. I have been trying to get my ReadProcessMemory() and WriteProcessMemory() functions to be working for so long and have tried almost every possibility but the right one. It launches the target program, returns its PID and handle just fine. But I always get a error code of 5 - ERROR_ACCESS_DENIED. When I run the read function(forget the write for now). I am launching this program as what I believe to be a CHILD process with PROCESS_ALL_ACCESS or CREATE_PRESERVE_CODE_AUTHZ_LEVEL. I have also tried PROCESS_ALL_ACCESS and PROCESS_VM_READ when I open the handle. I can also say that it is a valid memory location because I can find it on the running program with CheatEngine. As for VirtualQuery() I get an error code of 998 - ERROR_NOACCESS which further confirms my suspicion of it being some security/privilege problem. Any help or ideas would be very appreciated, again, it's my whole program so far, don't let it scare you =P. from ctypes import * from ctypes.wintypes import BOOL import binascii BYTE = c_ubyte WORD = c_ushort DWORD = c_ulong LPBYTE = POINTER(c_ubyte) LPTSTR = POINTER(c_char) HANDLE = c_void_p PVOID = c_void_p LPVOID = c_void_p UNIT_PTR = c_ulong SIZE_T = c_ulong class STARTUPINFO(Structure): _fields_ = [("cb", DWORD), ("lpReserved", LPTSTR), ("lpDesktop", LPTSTR), ("lpTitle", LPTSTR), ("dwX", DWORD), ("dwY", DWORD), ("dwXSize", DWORD), ("dwYSize", DWORD), ("dwXCountChars", DWORD), ("dwYCountChars", DWORD), ("dwFillAttribute",DWORD), ("dwFlags", DWORD), ("wShowWindow", WORD), ("cbReserved2", WORD), ("lpReserved2", LPBYTE), ("hStdInput", HANDLE), ("hStdOutput", HANDLE), ("hStdError", HANDLE),] class PROCESS_INFORMATION(Structure): _fields_ = [("hProcess", HANDLE), ("hThread", HANDLE), ("dwProcessId", DWORD), ("dwThreadId", DWORD),] class MEMORY_BASIC_INFORMATION(Structure): _fields_ = [("BaseAddress", PVOID), ("AllocationBase", PVOID), ("AllocationProtect", DWORD), ("RegionSize", SIZE_T), ("State", DWORD), ("Protect", DWORD), ("Type", DWORD),] class SECURITY_ATTRIBUTES(Structure): _fields_ = [("Length", DWORD), ("SecDescriptor", LPVOID), ("InheritHandle", BOOL)] class Main(): def __init__(self): self.h_process = None self.pid = None def launch(self, path_to_exe): CREATE_NEW_CONSOLE = 0x00000010 CREATE_PRESERVE_CODE_AUTHZ_LEVEL = 0x02000000 startupinfo = STARTUPINFO() process_information = PROCESS_INFORMATION() security_attributes = SECURITY_ATTRIBUTES() startupinfo.dwFlags = 0x1 startupinfo.wShowWindow = 0x0 startupinfo.cb = sizeof(startupinfo) security_attributes.Length = sizeof(security_attributes) security_attributes.SecDescriptior = None security_attributes.InheritHandle = True if windll.kernel32.CreateProcessA(path_to_exe, None, byref(security_attributes), byref(security_attributes), True, CREATE_PRESERVE_CODE_AUTHZ_LEVEL, None, None, byref(startupinfo), byref(process_information)): self.pid = process_information.dwProcessId print "Success: CreateProcess - ", path_to_exe else: print "Failed: Create Process - Error code: ", windll.kernel32.GetLastError() def get_handle(self, pid): PROCESS_ALL_ACCESS = 0x001F0FFF PROCESS_VM_READ = 0x0010 self.h_process = windll.kernel32.OpenProcess(PROCESS_VM_READ, False, pid) if self.h_process: print "Success: Got Handle - PID:", self.pid else: print "Failed: Get Handle - Error code: ", windll.kernel32.GetLastError() windll.kernel32.SetLastError(10000) def read_memory(self, address): buffer = c_char_p("The data goes here") bufferSize = len(buffer.value) bytesRead = c_ulong(0) if windll.kernel32.ReadProcessMemory(self.h_process, address, buffer, bufferSize, byref(bytesRead)): print "Success: Read Memory - ", buffer.value else: print "Failed: Read Memory - Error Code: ", windll.kernel32.GetLastError() windll.kernel32.CloseHandle(self.h_process) windll.kernel32.SetLastError(10000) def write_memory(self, address, data): count = c_ulong(0) length = len(data) c_data = c_char_p(data[count.value:]) null = c_int(0) if not windll.kernel32.WriteProcessMemory(self.h_process, address, c_data, length, byref(count)): print "Failed: Write Memory - Error Code: ", windll.kernel32.GetLastError() windll.kernel32.SetLastError(10000) else: return False def virtual_query(self, address): basic_memory_info = MEMORY_BASIC_INFORMATION() windll.kernel32.SetLastError(10000) result = windll.kernel32.VirtualQuery(address, byref(basic_memory_info), byref(basic_memory_info)) if result: return True else: print "Failed: Virtual Query - Error Code: ", windll.kernel32.GetLastError() main = Main() address = None main.launch("C:\Program Files\ProgramFolder\Program.exe") main.get_handle(main.pid) #main.write_memory(address, "\x61") while 1: print '1 to enter an address' print '2 to virtual query address' print '3 to read address' choice = raw_input('Choice: ') if choice == '1': address = raw_input('Enter and address: ') if choice == '2': main.virtual_query(address) if choice == '3': main.read_memory(address) Thanks!

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• impersonation and BackgroundWorker

  - by Lucian D

  Hello guys, I have a little bit of a problem when trying to use the BackgroundWorker class with impersonation. Following the answers from google, I got this code to impersonate public class MyImpersonation{ WindowsImpersonationContext impersonationContext; [DllImport("advapi32.dll")] public static extern int LogonUserA(String lpszUserName, String lpszDomain, String lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken); [DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)] public static extern int DuplicateToken(IntPtr hToken, int impersonationLevel, ref IntPtr hNewToken); [DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)] public static extern bool RevertToSelf(); [DllImport("kernel32.dll", CharSet = CharSet.Auto)] public static extern bool CloseHandle(IntPtr handle); public bool impersonateValidUser(String userName, String domain, String password) { WindowsIdentity tempWindowsIdentity; IntPtr token = IntPtr.Zero; IntPtr tokenDuplicate = IntPtr.Zero; if (RevertToSelf()) { if (LogonUserA(userName, domain, password, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, ref token) != 0) { if (DuplicateToken(token, 2, ref tokenDuplicate) != 0) { tempWindowsIdentity = new WindowsIdentity(tokenDuplicate); impersonationContext = tempWindowsIdentity.Impersonate(); if (impersonationContext != null) { CloseHandle(token); CloseHandle(tokenDuplicate); return true; } } } } if (token != IntPtr.Zero) CloseHandle(token); if (tokenDuplicate != IntPtr.Zero) CloseHandle(tokenDuplicate); return false; } } It worked really well until I've used it with the BackgroundWorker class. In this case, I've added a impersonation in the the code that runs asynchronously. I have no errors, but the issue I'm having is that the impersonation does not work when it is used in the async method. In code this looks something like this: instantiate a BGWorker, and add an event handler to the DoWork event: _bgWorker = new BackgroundWorker(); _bgWorker.DoWork += new DoWorkEventHandler(_bgWorker_DoWork); in the above handler, a impersonation is made before running some code. private void _bgWorker_DoWork(object sender, DoWorkEventArgs e) { MyImpersonation myImpersonation = new MyImpersonation(); myImpersonation.impersonateValidUser(user, domain, pass) //run some code... myImpersonation.undoImpersonation(); } the code is launched with BGWorker.RunWorkerAsync(); As I said before, no error is thrown, only that the code acts as if I did't run any impersonation, that is with it's default credentials. Moreover, the impersonation method returns true, so the impersonation took place at a certain level, but probably not on the current thread. This must happen because the async code runs on another thread, so there must be something that needs to be added to the MyImpersonation class. But what?? :) Thanks in advance, Lucian

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• CherryPy sessions for same domain, different port

  - by detly

  Consider the script below. It will launch two subprocesses, each one a CherryPy app (hit Ctrl+C or whatever the KeyboardInterrupt combo is on your system to end them both). If you run it with CP 3.0 (taking care to change the 3.0/3.1 specific lines in "StartServer"), then visit: http://localhost:15002/ ...you see an empty dict. Then visit: http://localhost:15002/set?val=10 http://localhost:15002/ ...and you see the newly populated dict. Then visit: http://localhost:15012/ ...and go back to http://localhost:15002/ ...and nothing has changed. If you try the same thing with CP 3.1 (remember the lines in "StartServer"!), when you get to the last step, the dict is now empty. This happens in Windows and Debian, Python 2.5 and 2.6. You can try all sorts of things: changing to file storage, separating the storage paths... the only difference it makes is that the sessions might get merged instead of erased. I've read another post about this as well, and there's a suggestion there to put the session tools config keys in the app config rather than the global config, but I don't think that's relevant to this usage where the apps run independently. What do I do to get independent CherryPy applications to NOT interfere with each other? Note: I originally asked this on the CherryPy mailing list but haven't had a response yet so I'm trying here. I hope that's okay. import os, os.path, socket, sys import subprocess import cgi import cherrypy HTTP_PORT = 15002 HTTP_HOST = "127.0.0.1" site1conf = { 'global' : { 'server.socket_host' : HTTP_HOST, 'server.socket_port' : HTTP_PORT, 'tools.sessions.on' : True, # 'tools.sessions.storage_type': 'file', # 'tools.sessions.storage_path': '1', # 'tools.sessions.storage_path': '.', 'tools.sessions.timeout' : 1440}} site2conf = { 'global' : { 'server.socket_host' : HTTP_HOST, 'server.socket_port' : HTTP_PORT + 10, 'tools.sessions.on' : True, # 'tools.sessions.storage_type': 'file', # 'tools.sessions.storage_path': '2', # 'tools.sessions.storage_path': '.', 'tools.sessions.timeout' : 1440}} class Home(object) : def __init__(self, key): self.key = key @cherrypy.expose def index(self): return """\ <html> <body>Session: <br>%s </body> </html> """ % cgi.escape(str(dict(cherrypy.session))) @cherrypy.expose def set(self, val): cherrypy.session[self.key.upper()] = val return """\ <html> <body>Set %s to %s</body> </html>""" % (cgi.escape(self.key), cgi.escape(val)) def StartServer(conf, key): cherrypy.config.update(conf) print 'Starting server (%s)' % key cherrypy.tree.mount(Home(key), '/', {}) # Start the web server. #### 3.0 # cherrypy.server.quickstart() # cherrypy.engine.start() #### #### 3.1 cherrypy.engine.start() cherrypy.engine.block() #### def Main(): # Start first webserver proc1 = subprocess.Popen( [sys.executable, os.path.abspath(__file__), "1"]) proc2 = subprocess.Popen( [sys.executable, os.path.abspath(__file__), "2"]) proc1.wait() proc2.wait() if __name__ == "__main__": print sys.argv if len(sys.argv) == 1: # Master process Main() elif(int(sys.argv[1]) == 1): StartServer(site1conf, 'magic') elif(int(sys.argv[1]) == 2): StartServer(site2conf, 'science') else: sys.exit(1)

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• Linq To Sql Concat() dropping fields in created TSQL

  - by user191468

  This is strange. I am moving a stored proc to a service. The TSQL unions multiple selects. To replicate this I created multiple queries resulting in a common new concrete type. Then I issue a return result.ToString(); and the resulting SQL selects have varying numbers of columns specified thus causing an MSSQL Msg 205... using (var db = GetDb()) { var fundInv = from f in db.funds select new Investments { Company = f.company, FullName = f.fullname, Admin = f.admin, Fund = f.fund1, FundCode = f.fundcode, Source = STR_FUNDS, IsPortfolio = false, IsActive = f.active, Strategy = f.strategy, SubStrategy = f.substrategy, AltStrategy = f.altstrategy, AltSubStrategy = f.altsubstrategy, Region = f.region, AltRegion = f.altregion, UseAlternate = f.usealt, ClassesAllowed = f.classallowed }; var stocksInv = from s in db.stocks where !fundInv.Select(f => f.Company).Contains(s.vehcode) select new Investments { Company = s.company, FullName = s.issuer, Admin = STR_PRS, Fund = s.shortname, FundCode = s.vehcode, Source = STR_STOCK, IsPortfolio = false, IsActive = (s.inactive == null), Strategy = s.style, SubStrategy = s.substyle, AltStrategy = s.altstyle, AltSubStrategy = s.altsubsty, Region = s.geography, AltRegion = s.altgeo, UseAlternate = s.usealt, ClassesAllowed = STR_GENERIC }; var bondsInv = from oi in db.bonds where !fundInv.Select(f => f.Company).Contains(oi.vehcode) select new Investments { Company = string.Empty, FullName = oi.issue, Admin = STR_PRS1, Fund = oi.issue, FundCode = oi.vehcode, Source = STR_BONDS, IsPortfolio = false, IsActive = oi.closed, Strategy = STR_OTH, SubStrategy = STR_OTH, AltStrategy = STR_OTH, AltSubStrategy = STR_OTH, Region = STR_OTH, AltRegion = STR_OTH, UseAlternate = false, ClassesAllowed = STR_GENERIC }; return (fundInv.Concat(stocksInv).Concat(bondsInv)).ToList(); } The code above results in a complex select statement where each "table" above has different column count. (see SQL below) I've been trying a few things but no change yet. Ideas are welcome. SELECT [t6].[company] AS [Company], [t6].[fullname] AS [FullName], [t6].[admin] AS [Admin], [t6].[fund] AS [Fund], [t6].[fundcode] AS [FundCode], [t6].[value] AS [Source], [t6].[value2] AS [IsPortfolio], [t6].[active] AS [IsActive], [t6].[strategy] AS [Strategy], [t6].[substrategy] AS [SubStrategy], [t6].[altstrategy] AS [AltStrategy], [t6].[altsubstrategy] AS [AltSubStrategy], [t6].[region] AS [Region], [t6].[altregion] AS [AltRegion], [t6].[usealt] AS [UseAlternate], [t6].[classallowed] AS [ClassesAllowed] FROM ( SELECT [t3].[company], [t3].[fullname], [t3].[admin], [t3].[fund], [t3].[fundcode], [t3].[value], [t3].[value2], [t3].[active], [t3].[strategy], [t3].[substrategy], [t3].[altstrategy], [t3].[altsubstrategy], [t3].[region], [t3].[altregion], [t3].[usealt], [t3].[classallowed] FROM ( SELECT [t0].[company], [t0].[fullname], [t0].[admin], [t0].[fund], [t0].[fundcode], @p0 AS [value], [t0].[active], [t0].[strategy], [t0].[substrategy], [t0].[altstrategy], [t0].[altsubstrategy], [t0].[region], [t0].[altregion], [t0].[usealt], [t0].[classallowed] FROM [zInvest].[funds] AS [t0] UNION ALL SELECT [t1].[company], [t1].[issuer], @p6 AS [value], [t1].[shortname], [t1].[vehcode], @p7 AS [value2], @p8 AS [value3], (CASE WHEN [t1].[inactive] IS NULL THEN 1 ELSE 0 END) AS [value5], [t1].[style], [t1].[substyle], [t1].[altstyle], [t1].[altsubsty], [t1].[geography], [t1].[altgeo], [t1].[usealt], @p10 AS [value6] FROM [zBank].[stocks] AS [t1] WHERE (NOT (EXISTS( SELECT NULL AS [EMPTY] FROM [zInvest].[funds] AS [t2] WHERE [t2].[company] = [t1].[vehcode] ))) AND ([t1].[vehcode] <> @p2) AND (SUBSTRING([t1].[vehcode], @p3 + 1, @p4) <> @p5) ) AS [t3] UNION ALL SELECT @p11 AS [value], [t4].[issue], @p12 AS [value2], [t4].[vehcode], @p13 AS [value3], @p14 AS [value4], [t4].[closed], @p16 AS [value6], @p17 AS [value7] FROM [zMut].[bonds] AS [t4] WHERE NOT (EXISTS( SELECT NULL AS [EMPTY] FROM [zInvest].[funds] AS [t5] WHERE [t5].[company] = [t4].[vehcode] )) ) AS [t6]

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• Handling Model Inheritance in ASP.NET MVC2 & NHibernate

  - by enth

  I've gotten myself stuck on how to handle inheritance in my model when it comes to my controllers/views. Basic Model: public class Procedure : Entity { public Procedure() { } public int Id { get; set; } public DateTime ProcedureDate { get; set; } public ProcedureType Type { get; set; } } public ProcedureA : Procedure { public double VariableA { get; set; } public int VariableB { get; set; } public int Total { get; set; } } public ProcedureB : Procedure { public int Score { get; set; } } etc... many of different procedures eventually. So, I do things like list all the procedures: public class ProcedureController : Controller { public virtual ActionResult List() { IEnumerable<Procedure> procedures = _repository.GetAll(); return View(procedures); } } but now I'm kinda stuck. Basically, from the list page, I need to link to pages where the specific subclass details can be viewed/edited and I'm not sure what the best strategy is. I thought I could add an action on the ProcedureController that would conjure up the right subclass by dynamically figuring out what repository to use and loading the subclass to pass to the view. I had to store the class in the ProcedureType object. I had to create/implement a non-generic IRepository since I can't dynamically cast to a generic one. public virtual ActionResult Details(int procedureID) { Procedure procedure = _repository.GetById(procedureID, false); string className = procedure.Type.Class; Type type = Type.GetType(className, true); Type repositoryType = typeof (IRepository<>).MakeGenericType(type); var repository = (IRepository)DependencyRegistrar.Resolve(repositoryType); Entity procedure = repository.GetById(procedureID, false); return View(procedure); } I haven't even started sorting out how the view is going to determine which partial to load to display the subclass details. I'm wondering if this is a good approach? This makes determining the URL easy. It makes reusing the Procedure display code easy. Another approach is specific controllers for each subclass. It simplifies the controller code, but also means many simple controllers for the many procedure subclasses. Can work out the shared Procedure details with a partial view. How to get to construct the URL to get to the controller/action in the first place? Time to not think about it. Hopefully someone can show me the light. Thanks in advance.

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• How to extent activrerecord,just make id to id.to_i

  - by qichunren

  module ActiveRecord module Mixin alias old_id id def id old_id.to_i end def hello "hellooooooooooooo" end end end ActiveRecord::Base.send :include, ActiveRecord::Mixin I make is because: id column in oracle is number type,not number(10), @user.id return 123.0,not 123,so I would like to do it by extend ar. But my way above does not work for me,it still show number with dot zero,123.0. How to make id auto invove id.to_i???

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• Java Singleton Pattern

  - by Spencer

  I'm used the Singleton Design Pattern public class Singleton { private static final Singleton INSTANCE = new Singleton(); // Private constructor prevents instantiation from other classes private Singleton() {} public static Singleton getInstance() { return INSTANCE; } } My question is how do I create an object of class Singleton in another class? I've tried: Singleton singleton = new Singleton(); // error - constructor is private Singleton singleton = Singleton.getInstance(); // error - non-static method cannot be referenced from a static context What is the correct code? Thanks, Spencer

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• Why does the proxy generated code create the wrong class namespace when a MessageContract is in my W

  - by DaleyKD

  I have created two WCF Services (Shipping & PDFGenerator). They both, along with my ClientApp, share an assembly named Kyle.Common.Contracts. Within this assembly, I have three classes: namespace Kyle.Common.Contracts { [MessageContract] public class PDFResponse { [MessageHeader] public string fileName { get; set; } [MessageBodyMember] public System.IO.Stream fileStream { get; set; } } [MessageContract] public class PDFRequest { [MessageHeader] public Enums.PDFDocumentNameEnum docType { get; set; } [MessageHeader] public int? pk { get; set; } [MessageHeader] public string[] emailAddress { get; set; } [MessageBodyMember] public Kyle.Common.Contracts.TrackItResult[] trackItResults { get; set; } } [DataContract(Name = "TrackResult", Namespace = "http://kyle")] public class TrackResult { [DataMember] public int SeqNum { get; set; } [DataMember] public int ShipmentID { get; set; } [DataMember] public string StoreNum { get; set; } } } My PDFGenerator ServiceContract looks like: namespace Kyle.WCF.PDFDocs { [ServiceContract(Namespace="http://kyle")] public interface IPDFDocsService { [OperationContract] PDFResponse GeneratePDF(PDFRequest request); [OperationContract] void GeneratePDFAsync(Kyle.Common.Contracts.Enums.PDFDocumentNameEnum docType, int? pk, string[] emailAddress); [OperationContract] Kyle.Common.Contracts.TrackResult[] Test(); } } If I comment out the GeneratePDF stub, the proxy generated by VS2010 realizes that Test returns an array of Kyle.Common.Contracts.TrackResult. However, if I leave GeneratePDF there, the proxy refuses to use Kyle.Common.Contracts.TrackResult, and instead creates a new class, ClientApp.PDFDocServices.TrackResult, and uses that as the return type of Test. Is there a way to force the proxy generator to use Kyle.Common.Contracts.TrackResult whenever I use a MessageContract? Perhaps there's a better method for using a Stream and File Name as return types? I just don't want to have to create a Copy method to copy from ClientApp.PDFDocServices.TrackResult to Kyle.Common.Contracts.TrackResult, since they should be the exact same class. Thanks in advance, Kyle

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• Another design-related C++ question

  - by Kotti

  Hi! I am trying to find some optimal solutions in C++ coding patterns, and this is one of my game engine - related questions. Take a look at the game object declaration (I removed almost everything, that has no connection with the question). // Abstract representation of a game object class Object : public Entity, IRenderable, ISerializable { // Object parameters // Other not really important stuff public: // @note Rendering template will never change while // the object 'lives' Object(RenderTemplate& render_template, /* params */) : /*...*/ { } private: // Object rendering template RenderTemplate render_template; public: /** * Default object render method * Draws rendering template data at (X, Y) with (Width, Height) dimensions * * @note If no appropriate rendering method overload is specified * for any derived class, this method is called * * @param Backend & b * @return void * @see */ virtual void Render(Backend& backend) const { // Render sprite from object's // rendering template structure backend.RenderFromTemplate( render_template, x, y, width, height ); } }; Here is also the IRenderable interface declaration: // Objects that can be rendered interface IRenderable { /** * Abstract method to render current object * * @param Backend & b * @return void * @see */ virtual void Render(Backend& b) const = 0; } and a sample of a real object that is derived from Object (with severe simplifications :) // Ball object class Ball : public Object { // Ball params public: virtual void Render(Backend& b) const { b.RenderEllipse(/*params*/); } }; What I wanted to get is the ability to have some sort of standard function, that would draw sprite for an object (this is Object::Render) if there is no appropriate overload. So, one can have objects without Render(...) method, and if you try to render them, this default sprite-rendering stuff is invoked. And, one can have specialized objects, that define their own way of being rendered. I think, this way of doing things is quite good, but what I can't figure out - is there any way to split the objects' "normal" methods (like Resize(...) or Rotate(...)) implementation from their rendering implementation? Because if everything is done the way described earlier, a common .cpp file, that implements any type of object would generally mix the Resize(...), etc methods implementation and this virtual Render(...) method and this seems to be a mess. I actually want to have rendering procedures for the objects in one place and their "logic implementation" - in another. Is there a way this can be done (maybe alternative pattern or trick or hint) or this is where all this polymorphic and virtual stuff sucks in terms of code placement?

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• Parsing Twitter API Datestamp

  - by Chris Armstrong

  I'm using the twitter API to return a list of status updates and the times they were created. It's returning the creation date in the following format: Fri Apr 09 12:53:54 +0000 2010 What's the simplest way (with PHP or Javascript) to format this like 09-04-2010?

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• LINQ query - null date

  - by d daly

  Hi Ive a simple linq query to return records with a null date field, just want to check the synatx of the "where" line is ok var query2 = from cs in db.tblCases where cs.date_closed == null etc, etc, thanks again DD

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• Django many to many queries

  - by Hulk

  In the following, How to get designation when querying Emp sc=Emp.objects.filter(pk=profile.emp.id)[0] sc.desg //this gives an error class Emp(models.Model): name = models.CharField(max_length=255, unique=True) address1 = models.CharField(max_length=255) city = models.CharField(max_length=48) state = models.CharField(max_length=48) country = models.CharField(max_length=48) desg = models.ManyToManyField(Designation) class Designation(models.Model): description = models.TextField() title = models.TextField() def __unicode__(self): return self.board

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• Azure storage: Uploaded files with size zero bytes

  - by Fabio Milheiro

  When I upload an image file to a blob, the image is uploaded apparently successfully (no errors). When I go to cloud storage studio, the file is there, but with a size of 0 (zero) bytes. The following is the code that I am using: // These two methods belong to the ContentService class used to upload // files in the storage. public void SetContent(HttpPostedFileBase file, string filename, bool overwrite) { CloudBlobContainer blobContainer = GetContainer(); var blob = blobContainer.GetBlobReference(filename); if (file != null) { blob.Properties.ContentType = file.ContentType; blob.UploadFromStream(file.InputStream); } else { blob.Properties.ContentType = "application/octet-stream"; blob.UploadByteArray(new byte[1]); } } public string UploadFile(HttpPostedFileBase file, string uploadPath) { if (file.ContentLength == 0) { return null; } string filename; int indexBar = file.FileName.LastIndexOf('\\'); if (indexBar > -1) { filename = DateTime.UtcNow.Ticks + file.FileName.Substring(indexBar + 1); } else { filename = DateTime.UtcNow.Ticks + file.FileName; } ContentService.Instance.SetContent(file, Helper.CombinePath(uploadPath, filename), true); return filename; } // The above code is called by this code. HttpPostedFileBase newFile = Request.Files["newFile"] as HttpPostedFileBase; ContentService service = new ContentService(); blog.Image = service.UploadFile(newFile, string.Format("{0}{1}", Constants.Paths.BlogImages, blog.RowKey)); Before the image file is uploaded to the storage, the Property InputStream from the HttpPostedFileBase appears to be fine (the size of the of image corresponds to what is expected! And no exceptions are thrown). And the really strange thing is that this works perfectly in other cases (uploading Power Points or even other images from the Worker role). The code that calls the SetContent method seems to be exactly the same and file seems to be correct since a new file with zero bytes is created at the correct location. Does any one have any suggestion please? I debugged this code dozens of times and I cannot see the problem. Any suggestions are welcome! Thanks

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• Code Chess: Fibonacci Sequence

  - by SLaks

  Building upon the proven success of Code Golf, I would like to introduce Code Chess. Unlike Code Golf, which strives for concision, Code Chess will strive for cleverness. Can you create a clever or unexpected Fibonacci generator? Your code must print or return either the nth Fibonacci number or the first n Fibonacci numbers.

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• How to get actual type of an derived class from its parent interface

  - by Tarik

  Hello people, Lets say we have a code portion like this : IProduct product = ProductCreator.CreateProduct(); //Factory Method we have here SellThisProduct(product); //... private void SellThisProduct(IProduct product) { //..do something here } //... internal class Soda : IProduct {} internal class Book : IProduct {} How can I infer which product is actually passed into SellThisProduct() method in the method? I think if I say GetType() or something it will probably return the IProduct type. Thanks...

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• How to best design a date/geographic proximity query on GAE?

  - by Dane

  Hi all, I'm building a directory for finding athletic tournaments on GAE with web2py and a Flex front end. The user selects a location, a radius, and a maximum date from a set of choices. I have a basic version of this query implemented, but it's inefficient and slow. One way I know I can improve it is by condensing the many individual queries I'm using to assemble the objects into bulk queries. I just learned that was possible. But I'm also thinking about a more extensive redesign that utilizes memcache. The main problem is that I can't query the datastore by location because GAE won't allow multiple numerical comparison statements (<,<=,=,) in one query. I'm already using one for date, and I'd need TWO to check both latitude and longitude, so it's a no go. Currently, my algorithm looks like this: 1.) Query by date and select 2.) Use destination function from geopy's distance module to find the max and min latitude and longitudes for supplied distance 3.) Loop through results and remove all with lat/lng outside max/min 4.) Loop through again and use distance function to check exact distance, because step 2 will include some areas outside the radius. Remove results outside supplied distance (is this 2/3/4 combination inefficent?) 5.) Assemble many-to-many lists and attach to objects (this is where I need to switch to bulk operations) 6.) Return to client Here's my plan for using memcache.. let me know if I'm way out in left field on this as I have no prior experience with memcache or server caching in general. -Keep a list in the cache filled with "geo objects" that represent all my data. These have five properties: latitude, longitude, event_id, event_type (in anticipation of expanding beyond tournaments), and start_date. This list will be sorted by date. -Also keep a dict of pointers in the cache which represent the start and end indices in the cache for all the date ranges my app uses (next week, 2 weeks, month, 3 months, 6 months, year, 2 years). -Have a scheduled task that updates the pointers daily at 12am. -Add new inserts to the cache as well as the datastore; update pointers. Using this design, the algorithm would now look like: 1.) Use pointers to slice off appropriate chunk of list based on supplied date. 2-4.) Same as above algorithm, except with geo objects 5.) Use bulk operation to select full tournaments using remaining geo objects' event_ids 6.) Assemble many-to-manys 7.) Return to client Thoughts on this approach? Many thanks for reading and any advice you can give. -Dane

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• Defining InputBindings within a Style

  - by Brent

  I'm creating a WPF app using the MVVM design pattern, and I'm trying to extend the TabItem control so that it closes the tab when the user clicks the middle mouse button. I'm trying to achieve this using InputBindings, and it works very well until I try to define it within a style. I've learned that you cannot add InputBindings to a style unless you attach it using a DependencyProperty. So I followed this similar post here... and it works... almost. I can close one tab using the middle mouse button, but it won't work on any of the other tabs (all of the tabs are added at runtime and inherit the same style). So I need some help. Why would this only be working the first time, and not after? Obviously I could create a custom control that inherits from a TabItem and make it work, but I'd like to figure this out as I can see this being expanded in my projects. I'm no expert on DependencyProperties, so please help me out. Thanks! Style: <Style TargetType="{x:Type TabItem}"> <Setter Property="w:Attach.InputBindings"> <Setter.Value> <InputBindingCollection> <MouseBinding MouseAction="MiddleClick" Command="{Binding CloseCommand}"/> </InputBindingCollection> </Setter.Value> </Setter> ... </Style> Class public class Attach { public static readonly DependencyProperty InputBindingsProperty = DependencyProperty.RegisterAttached("InputBindings", typeof(InputBindingCollection), typeof(Attach), new FrameworkPropertyMetadata(new InputBindingCollection(), (sender, e) => { var element = sender as UIElement; if (element == null) return; element.InputBindings.Clear(); element.InputBindings.AddRange((InputBindingCollection)e.NewValue); })); public static InputBindingCollection GetInputBindings(UIElement element) { return (InputBindingCollection)element.GetValue(InputBindingsProperty); } public static void SetInputBindings(UIElement element, InputBindingCollection inputBindings) { element.SetValue(InputBindingsProperty, inputBindings); } }

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• Dynamically select field names in a query with Spring JDBCTemplate

  - by Francesco

  Hi, I have a problem with parameters replacing by Spring JdbcTemplate. I have this query : <bean id="fixQuery" class="java.lang.String"> <constructor-arg type="java.lang.String" value="select fa.id, fi.? from fix_ambulation fa left join fix_i18n fi on fa.translation_id = fi.id order by name" /> And this method : public List<FixAmbulation> readFixAmbulation(String locale) throws Exception { List<FixAmbulation> ambulations = this.getJdbcTemplate().query( fixQuery, new Object[] {locale.toLowerCase()}, ParameterizedBeanPropertyRowMapper .newInstance(FixAmbulation.class)); return ambulations; } And I'd like to have the ? filled with the string representing the locale the user is using. So if the user is brasilian I'd send him the column pt_br from the table fix_i18n, otherwise if he's american I'd send him the column en_us. What I get from this method is a PostgreSQL exception org.postgresql.util.PSQLException: ERROR: syntax error at or near "$1" If I replace fi.? with just ? (the column name of the locale is unique, so if I run this query in the database it works just fine) what I get is that every object returned from method has the string locale into the field name. I.e. in name field I have "en_us". The only way to have it working I found was to change the method into : public List<FixAmbulation> readFixAmbulation(String locale) throws Exception { String query = "select fa.id, fi." + locale.toLowerCase() + " as name " + fixQuery; this.log.info("QUERY : " + query); List<FixAmbulation> ambulations = this.getJdbcTemplate().query( query, ParameterizedBeanPropertyRowMapper .newInstance(FixAmbulation.class)); return ambulations; } and setting fixQuery to : <bean id="fixQuery" class="java.lang.String"> <constructor-arg type="java.lang.String" value=" from telemedicina.fix_ambulation fa left join telemedicina.fix_i18n fi on fa.translation_id = fi.id order by name" /> </bean> My DAO extends Spring JdbcDaoSupport and works just fine for all other queries. What am I doing wrong?

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• Python regex group clarification

  - by nkr1pt

  I have 0 experience with python, very little with regex and I'm trying to figure out what this small snippet of python regex would give back from a http response header Set-Cookie entry: REGEX_COOKIE = '([A-Z]+=[^;]+;)' resp = urllib2.urlopen(req) re.search(REGEX_COOKIE, resp.info()['Set-Cookie']).group(1) Can one give a simple example of a Set-Cookie value and explain what this would match on + return? Regards

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• Prevent Coldfusion from encoding html

  - by cr1ms0n3cho

  I am trying to return html from <cfsavecontent variables="html"> <p>Some html</p> </cfsavecontent> <cfreturn html> But when it comes back from the function the html is encoded I found this thread http://www.coldfusionjedi.com/forums/messages.cfm?threadid=BB31B124-19B9-E658-9D3F5726B8607FD8 which has some solutions but im hoping for something a little less messy. Any help is appreciated! Thanks

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• iPhone SDK can't get UIScrollView to work with a UIWebView

  - by Maxwell Segal

  I am building an app that in part of it has two views - one portrait and one landscape. And I want to offer scrolling and pinch & zooming on the landscape orientation. I've built the two views and the simple UIImages in the landscape view all work OK but it does not seem to insert my UIWebView into the UIScrollView. I've done this before with UIImage and all was OK but I must be missing something here - can anybody help with some advice. I'm sure it's something very simple - perhaps to do with the adding of the subview??. Thanks in advance of your help. I've shown the relevant parts of my code below: @interface MonthViewController : UIViewController <UIScrollViewDelegate> { MonthViewController *monthController; IBOutlet UIView *portraitView; IBOutlet UIView *landscapeView; IBOutlet UIWebView *monthKWHChartPortrait; UIWebView *monthKWHChartLandscape; IBOutlet UIScrollView *scrollChartLandscape; IBOutlet UIImageView *eLogoPortrait; IBOutlet UIImageView *eLogoLandscape; IBOutlet UIImageView *clientLogoPortrait; IBOutlet UIImageView *clientLogoLandscape; IBOutlet UIActivityIndicatorView *loadIndicatorPortrait; IBOutlet UIActivityIndicatorView *loadIndicatorLandscape; NSTimer *timer; IBOutlet UILabel *test; } -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollChartLandscape { return monthKWHChartLandscape; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight); } -(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { [super willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:duration]; if (toInterfaceOrientation ==UIInterfaceOrientationLandscapeRight) { NSLog(@"right"); test.text=@"right"; NSString *urlAddressLandscape = @"http://PRIVATEURLHERE.aspx?WIDTH=440"; NSURL *urlLandscape = [NSURL URLWithString:urlAddressLandscape]; NSURLRequest *requestObjLandscape = [NSURLRequest requestWithURL:urlLandscape]; [self.monthKWHChartLandscape loadRequest:requestObjLandscape]; scrollChartLandscape.contentSize = CGSizeMake(monthKWHChartLandscape.frame.size.width, monthKWHChartLandscape.frame.size.height); scrollChartLandscape.maximumZoomScale = 2.5; scrollChartLandscape.minimumZoomScale = 0.6; scrollChartLandscape.showsHorizontalScrollIndicator = YES; scrollChartLandscape.showsVerticalScrollIndicator = YES; scrollChartLandscape.clipsToBounds = YES; scrollChartLandscape.delegate = self; [self.scrollChartLandscape addSubview:monthKWHChartLandscape]; self.view=landscapeView; //self.view.transform=CGAffineTransformMakeRotation(deg2rad*(90)); //self.view.bounds=CGRectMake(0.0, 0.0, 480.0, 320.0); } else

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• Querying many to many fields in django

  - by Hulk

  In the models there is a many to many fields as, from emp.models import Name def info(request): name = models.ManyToManyField(Name) And in emp.models the schema is as class Name(models.Model): name = models.CharField(max_length=512) def __unicode__(self): return self.name Now when i want to query a particular id say for ex: info= info.objects.filter(id=a) for i in info: logging.debug(i.name) //gives an error how should the query be to get the name Thanks..

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• Implementing an async "read all currently available data from stream" operation

  - by Jon

  I recently provided an answer to this question: C# - Realtime console output redirection. As often happens, explaining stuff (here "stuff" was how I tackled a similar problem) leads you to greater understanding and/or, as is the case here, "oops" moments. I realized that my solution, as implemented, has a bug. The bug has little practical importance, but it has an extremely large importance to me as a developer: I can't rest easy knowing that my code has the potential to blow up. Squashing the bug is the purpose of this question. I apologize for the long intro, so let's get dirty. I wanted to build a class that allows me to receive input from a console's standard output Stream. Console output streams are of type FileStream; the implementation can cast to that, if needed. There is also an associated StreamReader already present to leverage. There is only one thing I need to implement in this class to achieve my desired functionality: an async "read all the data available this moment" operation. Reading to the end of the stream is not viable because the stream will not end unless the process closes the console output handle, and it will not do that because it is interactive and expecting input before continuing. I will be using that hypothetical async operation to implement event-based notification, which will be more convenient for my callers. The public interface of the class is this: public class ConsoleAutomator { public event EventHandler<ConsoleOutputReadEventArgs> StandardOutputRead; public void StartSendingEvents(); public void StopSendingEvents(); } StartSendingEvents and StopSendingEvents do what they advertise; for the purposes of this discussion, we can assume that events are always being sent without loss of generality. The class uses these two fields internally: protected readonly StringBuilder inputAccumulator = new StringBuilder(); protected readonly byte[] buffer = new byte[256]; The functionality of the class is implemented in the methods below. To get the ball rolling: public void StartSendingEvents(); { this.stopAutomation = false; this.BeginReadAsync(); } To read data out of the Stream without blocking, and also without requiring a carriage return char, BeginRead is called: protected void BeginReadAsync() { if (!this.stopAutomation) { this.StandardOutput.BaseStream.BeginRead( this.buffer, 0, this.buffer.Length, this.ReadHappened, null); } } The challenging part: BeginRead requires using a buffer. This means that when reading from the stream, it is possible that the bytes available to read ("incoming chunk") are larger than the buffer. Remember that the goal here is to read all of the chunk and call event subscribers exactly once for each chunk. To this end, if the buffer is full after EndRead, we don't send its contents to subscribers immediately but instead append them to a StringBuilder. The contents of the StringBuilder are only sent back whenever there is no more to read from the stream. private void ReadHappened(IAsyncResult asyncResult) { var bytesRead = this.StandardOutput.BaseStream.EndRead(asyncResult); if (bytesRead == 0) { this.OnAutomationStopped(); return; } var input = this.StandardOutput.CurrentEncoding.GetString( this.buffer, 0, bytesRead); this.inputAccumulator.Append(input); if (bytesRead < this.buffer.Length) { this.OnInputRead(); // only send back if we 're sure we got it all } this.BeginReadAsync(); // continue "looping" with BeginRead } After any read which is not enough to fill the buffer (in which case we know that there was no more data to be read during the last read operation), all accumulated data is sent to the subscribers: private void OnInputRead() { var handler = this.StandardOutputRead; if (handler == null) { return; } handler(this, new ConsoleOutputReadEventArgs(this.inputAccumulator.ToString())); this.inputAccumulator.Clear(); } (I know that as long as there are no subscribers the data gets accumulated forever. This is a deliberate decision). The good This scheme works almost perfectly: Async functionality without spawning any threads Very convenient to the calling code (just subscribe to an event) Never more than one event for each time data is available to be read Is almost agnostic to the buffer size The bad That last almost is a very big one. Consider what happens when there is an incoming chunk with length exactly equal to the size of the buffer. The chunk will be read and buffered, but the event will not be triggered. This will be followed up by a BeginRead that expects to find more data belonging to the current chunk in order to send it back all in one piece, but... there will be no more data in the stream. In fact, as long as data is put into the stream in chunks with length exactly equal to the buffer size, the data will be buffered and the event will never be triggered. This scenario may be highly unlikely to occur in practice, especially since we can pick any number for the buffer size, but the problem is there. Solution? Unfortunately, after checking the available methods on FileStream and StreamReader, I can't find anything which lets me peek into the stream while also allowing async methods to be used on it. One "solution" would be to have a thread wait on a ManualResetEvent after the "buffer filled" condition is detected. If the event is not signaled (by the async callback) in a small amount of time, then more data from the stream will not be forthcoming and the data accumulated so far should be sent to subscribers. However, this introduces the need for another thread, requires thread synchronization, and is plain inelegant. Specifying a timeout for BeginRead would also suffice (call back into my code every now and then so I can check if there's data to be sent back; most of the time there will not be anything to do, so I expect the performance hit to be negligible). But it looks like timeouts are not supported in FileStream. Since I imagine that async calls with timeouts are an option in bare Win32, another approach might be to PInvoke the hell out of the problem. But this is also undesirable as it will introduce complexity and simply be a pain to code. Is there an elegant way to get around the problem? Thanks for being patient enough to read all of this. Update: I definitely did not communicate the scenario well in my initial writeup. I have since revised the writeup quite a bit, but to be extra sure: The question is about how to implement an async "read all the data available this moment" operation. My apologies to the people who took the time to read and answer without me making my intent clear enough.

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