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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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  • Neural Networks in C# using NeuronDotNet

    - by kingrichard2005
    Hello, I'm testing the NeuronDotNet library for a class assignment using C#. I have a very simple console application that I'm using to test some of the code snippets provided in the manual fro the library, the goal of the assignment is to teach the program how to distinguish between random points in a square which may or may not be within a circle that is also inside the square. So basically, which points inside the square are also inside the circle. Here is what I have so far: namespace _469_A7 { class Program { static void Main(string[] args) { //Initlaize the backpropogation network LinearLayer inputLayer = new LinearLayer(2); SigmoidLayer hiddenLayer = new SigmoidLayer(8); SigmoidLayer outputLayer = new SigmoidLayer(2); new BackpropagationConnector(inputLayer, hiddenLayer); new BackpropagationConnector(hiddenLayer, outputLayer); BackpropagationNetwork network = new BackpropagationNetwork(inputLayer, outputLayer); //Generate a training set for the ANN TrainingSet trainingSet = new TrainingSet(2, 2); //TEST: Generate random set of points and add to training set, //for testing purposes start with 10 samples; Point p; Program program = new Program(); //Used to access randdouble function Random rand = new Random(); for(int i = 0; i < 10; i++) { //These points will be within the circle radius Type A if(rand.NextDouble() > 0.5) { p = new Point(rand.NextDouble(), rand.NextDouble()); trainingSet.Add(new TrainingSample(new double[2] { p.getX(), p.getY() }, new double[2] { 1, 0 })); continue; } //These points will either be on the border or outside the circle Type B p = new Point(program.randdouble(1.0, 4.0), program.randdouble(1.0, 4.0)); trainingSet.Add(new TrainingSample(new double[2] { p.getX(), p.getY() }, new double[2] { 0, 1 })); } //Start network learning network.Learn(trainingSet, 100); //Stop network learning //network.StopLearning(); } //generates a psuedo-random double between min and max public double randdouble(double min, double max) { Random rand = new Random(); if (min > max) { return rand.NextDouble() * (min - max) + max; } else { return rand.NextDouble() * (max - min) + min; } } } //Class defines a point in X/Y coordinates public class Point { private double X; private double Y; public Point(double xVal, double yVal) { this.X = xVal; this.Y = yVal; } public double getX() { return X; } public double getY() { return Y; } } } This is basically all that I need, the only question I have is how to handle output?? More specifically, I need to output the value of the "step size" and the momentum, although it would be nice to output other information as well. Anyone with experience using NeuronDotNet, your input is appreciated.

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  • for my project I have problem in report

    - by pink rose
    public stack(int size) { this.size=size; Array = new int[size]; } public void push(int j) { if (top < size) { Array[++top] = j; } } public int pop() { return Array[top--]; } public int top() { return Array[top]; } public boolean isEmpty() { return (top == -1); } } import javax.swing.JOptionPane; public class menu { private static stack s; private static int numbers[]; public static void main(String args[]) { start(); } public static void start() { int i = Integer.parseInt(JOptionPane.showInputDialog("1. size of array\n2. data entry\n3. display content\n4. exit")); switch (i) { case 1: setSize(); break; case 2: addElement(); break; case 3: showElements(); break; case 4: exit(); } } public static void setSize() { int size = Integer.parseInt(JOptionPane.showInputDialog("Please Enter The Size")); s = new stack(size); numbers = new int[10]; start(); } public static void addElement() { for(int x=0;x<s.size;x++) { int e = Integer.parseInt(JOptionPane.showInputDialog("Please Enter The Element")); numbers[e]++; s.push(e); } start(); } public static void showElements() { String result = ""; int temp; while (!s.isEmpty()) { temp = s.pop(); if (numbers[temp] == 1) { result = temp+result; } } JOptionPane.showMessageDialog(null, result); start(); } public static void exit() { System.exit(0); } } This my project I was finished but I have problem in question in my report Conclusion. It should summarize the state of your project and indicate which part of your project is working and which part is not working or with limitations. You may also provide your suggestions and comments to this project what I can answer I didn't have any idea

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  • c# Properties.Settings.Default Doesn't work as expected

    - by Jack
    I've been working on a program to automate my backup checks with LogMeIn backup (a windows forms based program). I now need a way to store user settings, to save information easily. I've never worked with the Application/User settings that is somewhat "built-in" - and decided to try it, but ran into problems. I added four settings for now: IncludeCriteria (Specialized.StringCollection) ExcludeCriteria (Specialized.StringCollection) ReportPath (string) ReportType (int) But the behavior doesn't act as expected (go figure). After saving some values in my program, I go back into edit/view my settings values using the VS 2008 settings editor. None of my values are stored. While I think this may be because those values are just default values, wouldn't that be where they can be stored/read/changed? Here is my load form code (still very unrefined): private void setupForm() { txtPath.Text = BackupReport.Properties.Settings.Default.ReportPath == null ? "" : BackupReport.Properties.Settings.Default.ReportPath; if (BackupReport.Properties.Settings.Default.ReportType == 0) { radioHTML.Checked = true; } else radioExcel.Checked = true; if (BackupReport.Properties.Settings.Default.IncludeCriteria.Count > 0) { listIncludeCriteria.DataSource = Properties.Settings.Default.IncludeCriteria; //foreach (string s in Properties.Settings.Default.IncludeCriteria) // listIncludeCriteria.Items.Add(s); } if (BackupReport.Properties.Settings.Default.ExcludeCriteria.Count > 0) { listExcludeCriteria.DataSource = BackupReport.Properties.Settings.Default.ExcludeCriteria; //foreach (string s in Properties.Settings.Default.ExcludeCriteria) // listExcludeCriteria.Items.Add(s); } } listIncludeCriteria is just a listbox. When the user saves I call this method: private void saveSettings() { //var settings = BackupReport.Properties.Settings; if (txtPath.Text != "") { BackupReport.Properties.Settings.Default.ReportPath = txtPath.Text; } if (listIncludeCriteria.Items.Count > 0) { //BackupReport.Properties.Settings.Default.IncludeCriteria = (StringCollection)listIncludeCriteria.Items.AsQueryable(); foreach (var i in listIncludeCriteria.Items) { if (!isIncludeDuplicate(i.ToString())) BackupReport.Properties.Settings.Default.IncludeCriteria.Add(i.ToString()); } } if (listExcludeCriteria.Items.Count > 0) { //BackupReport.Properties.Settings.Default.ExcludeCriteria = (StringCollection)listExcludeCriteria.Items.AsQueryable(); foreach (var i in listExcludeCriteria.Items) { if (!isExcludeDuplicate(i.ToString())) Properties.Settings.Default.ExcludeCriteria.Add(i.ToString()); } } if (radioExcel.Checked == true) BackupReport.Properties.Settings.Default.ReportType = 1; else BackupReport.Properties.Settings.Default.ReportType = 0; BackupReport.Properties.Settings.Default.Save(); //Properties.Settings.Default.Save(); this.DialogResult = DialogResult.OK; this.Close(); } The wierd thing is when the form loads, the path I put in the first time seems to come up (ReportPath) - even the listBoxes are populated with a bunch of crap I put in - yet I cant find these values anywhere. Any help would be appreciated! Josh

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  • Abstract class and constructor

    - by Amutha
    As abstract class can be instantiated ,still why constructor is allowed inside abstract class? public abstract class SomeClass { private string _label; public SomeClass(string label) { _label=label; } }

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  • Deletes not cascading for self-referencing entities

    - by jwaddell
    I have the following (simplified) Hibernate entities: @Entity @Table(name = "package") public class Package { protected Content content; @OneToOne(cascade = {javax.persistence.CascadeType.ALL}) @JoinColumn(name = "content_id") @Fetch(value = FetchMode.JOIN) public Content getContent() { return content; } public void setContent(Content content) { this.content = content; } } @Entity @Table(name = "content") public class Content { private Set<Content> subContents = new HashSet<Content>(); private ArchivalInformationPackage parentPackage; @OneToMany(fetch = FetchType.EAGER) @JoinTable(name = "subcontents", joinColumns = {@JoinColumn(name = "content_id")}, inverseJoinColumns = {@JoinColumn(name = "elt")}) @Cascade(value = {org.hibernate.annotations.CascadeType.DELETE, org.hibernate.annotations.CascadeType.REPLICATE}) @Fetch(value = FetchMode.SUBSELECT) public Set<Content> getSubContents() { return subContents; } public void setSubContents(Set<Content> subContents) { this.subContents = subContents; } @ManyToOne(cascade = {CascadeType.ALL}) @JoinColumn(name = "parent_package_id") public Package getParentPackage() { return parentPackage; } public void setParentPackage(Package parentPackage) { this.parentPackage = parentPackage; } } So there is one Package, which has one "top" Content. The top Content links back to the Package, with cascade set to ALL. The top Content may have many "sub" Contents, and each sub-Content may have many sub-Contents of its own. Each sub-Content has a parent Package, which may or may not be the same Package as the top Content (ie a many-to-one relationship for Content to Package). The relationships are required to be ManyToOne (Package to Content) and ManyToMany (Content to sub-Contents) but for the case I am currently testing each sub-Content only relates to one Package or Content. The problem is that when I delete a Package and flush the session, I get a Hibernate error stating that I'm violating a foreign key constraint on table subcontents, with a particular content_id still referenced from table subcontents. I've tried specifically (recursively) deleting the Contents before deleting the Package but I get the same error. Is there a reason why this entity tree is not being deleted properly? EDIT: After reading answers/comments I realised that a Content cannot have multiple Packages, and a sub-Content cannot have multiple parent-Contents, so I have modified the annotations from ManyToOne and ManyToMany to OneToOne and OneToMany. Unfortunately that did not fix the problem. I have also added the bi-directional link from Content back to the parent Package which I left out of the simplified code.

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  • Error using httlib's HTTPSConnection with PKCS#12 certificate

    - by Remi Despres-Smyth
    Hello. I'm trying to use httplib's HTTPSConnection for client validation, using a PKCS #12 certificate. I know the certificate is good, as I can connect to the server using it in MSIE and Firefox. Here's my connect function (the certificate includes the private key). I've pared it down to just the basics: def connect(self, cert_file, host, usrname, passwd): self.cert_file = cert_file self.host = host self.conn = httplib.HTTPSConnection(host=self.host, port=self.port, key_file=cert_file, cert_file=cert_file) self.conn.putrequest('GET', 'pathnet/,DanaInfo=200.222.1.1+') self.conn.endheaders() retCreateCon = self.conn.getresponse() if is_verbose: print "Create HTTPS connection, " + retCreateCon.read() (Note: No comments on the hard-coded path, please - I'm trying to get this to work first; I'll make it pretty afterwards. The hard-coded path is correct, as I connect to it in MSIE and Firefox. I changed the IP address for the post.) When I try to run this using a PKCS#12 certificate (a .pfx file), I get back what appears to be an openSSL error. Here is the entire error traceback: File "Usinghttplib_Test.py", line 175, in t.connect(cert_file=opts["-keys"], host=host_name, usrname=opts["-username"], passwd=opts["-password"]) File "Usinghttplib_Test.py", line 40, in connect self.conn.endheaders() File "c:\python26\lib\httplib.py", line 904, in endheaders self._send_output() File "c:\python26\lib\httplib.py", line 776, in _send_output self.send(msg) File "c:\python26\lib\httplib.py", line 735, in send self.connect() File "c:\python26\lib\httplib.py", line 1112, in connect self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file) File "c:\python26\lib\ssl.py", line 350, in wrap_socket suppress_ragged_eofs=suppress_ragged_eofs) File "c:\python26\lib\ssl.py", line 113, in __init__ cert_reqs, ssl_version, ca_certs) ssl.SSLError: [Errno 336265225] _ssl.c:337: error:140B0009:SSL routines:SSL_CTX_use_PrivateKey_file:PEM lib Notice, the openSSL error (the last entry in the list) notes "PEM lib", which I found odd, since I'm not trying to use a PEM certificate. For kicks, I converted the PKCS#12 cert to a PEM cert, and ran the same code using that. In that case, I received no error, I was prompted to enter the PEM pass phrase, and the code did attempt to reach the server. (I received the response "The service is not available. Please try again later.", but I believe that would be because the server does not accept the PEM cert. I can't connect in Firefox to the server using the PEM cert either.) Is httplib's HTTPSConnection supposed to support PCKS#12 certificates? (That is, pfx files.) If so, why does it look like openSSL is trying to load it inside the PEM lib? Am I doing this all wrong? Any advice is welcome. EDIT: The certificate file contains both the certificate and the private key, which is why I'm providing the same file name for both the HTTPSConnection's key_file and cert_file parameters.

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  • Casting SelectedItem of WPF Combobox to Color causes exception

    - by Nick Udell
    I have a combobox databound to the available system colors. When the user selects a color the following code is fired: private void cboFontColour_SelectionChanged(object sender, SelectionChangedEventArgs e) { Color colour = (Color)(cboFontColour.SelectedItem); } This throws a Casting Exception with the following message: "Specified cast is not valid." When I hover over cboFontColour.SelectedItem in the debugger, it is always a Color object. I do not understand why the system seemingly cannot cast from Color to Color, any help would be much obliged.

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  • How to call JDialog with Netbeans

    - by Raptrex
    Yesterday I asked this question: Is this possible to make as an option dialog? and I learned it could be made with JDialog. I'm using Netbeans GUI editor and made a button that will call my custom JDialog I designed in the GUI editor. The JDialog is called jDialog1. How do I call the jDialog1 with the button? private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: }

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  • Change type of control by type

    - by Ruben
    Hi, I'm having following problem. I should convert a control to a certain type, this can be multiple types (for example a custom button or a custom label, ....) Here's an example of what i would like to do: private void ConvertToTypeAndUseCustomProperty(Control c) { Type type = c.getType(); ((type) c).CustomPropertieOfControl = 234567; } Thanks in advance.

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  • VBScript Out of String space

    - by MalsiaPro
    I got the following code to capture information for files on a specified drive, I ran the script againts a 600 GB hard drive on one of our servers and after a while I get the error Out of String space; "Join". Line 34, Char 2 For this code, file script.vbs: Option Explicit Dim objFS, objFld Dim objArgs Dim strFolder, strDestFile, blnRecursiveSearch ''Dim strLines Dim strCsv ''Dim i '' i = 0 ' 'Get the commandline parameters ' Set objArgs = WScript.Arguments ' strFolder = objArgs(0) ' strDestFile = objArgs(1) ' blnRecursiveSearch = objArgs(2) '######################################## 'SPECIFY THE DRIVE YOU WANT TO SCAN BELOW '######################################## strFolder = "C:\" strDestFile = "C:\InformationOutput.csv" blnRecursiveSearch = True 'Create the FileSystemObject Set objFS=CreateObject("Scripting.FileSystemObject") 'Get the directory you are working in Set objFld = objFS.GetFolder(strFolder) 'Open the csv file Set strCsv = objFS.CreateTextFile(strDestFile, True) '' 'Write the csv file '' Set strCsv = objFS.CreateTextFile(strDestFile, True) strCsv.WriteLine "File Path,File Size,Date Created,Date Last Modified,Date Last Accessed" '' strCsv.Write Join(strLines, vbCrLf) 'Now get the file details GetFileDetails objFld, blnRecursiveSearch '' 'Close and cleanup objects '' strCsv.Close '' 'Write the csv file '' Set strCsv = objFS.CreateTextFile(strDestFile, True) '' For i = 0 to UBound(strLines) '' strCsv.WriteLine strLines(i) '' Next 'Close and cleanup objects strCsv.Close Set strCsv = Nothing Set objFld = Nothing Set strFolder = Nothing Set objArgs = Nothing '---------------------------SCAN SPECIFIED LOCATION------------------------------- Private Sub GetFileDetails(fold, blnRecursive) Dim fld, fil dim strLine(4) on error resume next If InStr(fold.Path, "System Volume Information") < 1 Then If blnRecursive Then 'Work through all the folders and subfolders For Each fld In fold.SubFolders GetFileDetails fld, True If err.number <> 0 then LogError err.Description & vbcrlf & "Folder - " & fold.Path err.Clear End If Next End If 'Now work on the files For Each fil in fold.Files strLine(0) = fil.Path strLine(1) = fil.Size strLine(2) = fil.DateCreated strLine(3) = fil.DateLastModified strLine(4) = fil.DateLastAccessed strCsv.WriteLine Join(strLine, ",") if err.number <> 0 then LogError err.Description & vbcrlf & "Folder - " & fold.Path & vbcrlf & "File - " & fil.Name err.Clear End If Next End If end sub Private sub LogError(strError) dim strErr 'Write the csv file Set strErr = objFS.CreateTextFile("C:\test\err.log", false) strErr.WriteLine strError strErr.Close Set strErr = nothing End Sub RunMe.cmd wscript.exe "C:\temp\script\script.vbs" How can I avoid getting this error? The server drives are quite a bit <???? and I would imagine that the CSV file would be at least 40 MB. Edit by Guffa: I commented out some lines in the code, using double ticks ('') so you can see where.

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  • Exception handling within an Exception in C#

    - by Shrewd Demon
    hi, i know this could be a little weird but a doubt is a doubt afterall... what would happen in the following situation... private void SendMail() { try { //i try to send a mail and it throws an exception } catch(Exception ex) { //so i will handle that exception over here //and since an exception occurred while sending a mail //i will log an event with the eventlog //All i want to know is what if an exception occurs here //while writing the error log, how should i handle it?? } } Thank you.

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  • Reflection, get DataAnnotation attributes from buddy class.

    - by Feryt
    Hi. I need to check if property has specific attribute defined in its buddy class: [MetadataType(typeof(Metadata))] public sealed partial class Address { private sealed class Metadata { [Required] public string Address1 { get; set; } [Required] public string Zip { get; set; } } } How to check what properties has defined Required attribute? Thank you.

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  • OnFinishInflate inside ListActivity

    - by zegnus
    I have a main class filled with a cursor adapter: public class MainMenu extends ListActivity{ ... private void updateData(){ ... SimpleAdapter notes = new SimpleAdapter(this, array, R.layout.row_task, from, to); setListAdapter(notes); } } I need to know when this list has finnished to inflate it, so I've discovered this methods: ListView.onFinishInflate()... But I have no idea how to override it inside my code. Any idea?

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  • Storing Objects in columns using Hibernate JPA

    - by user210791
    Is it possible to store something like the following using only one table? Right now, what hibernate will do is create two tables, one for Families and one for people. I would like for the familymembers object to be serialized into the column in the database. @Entity(name = "family") class Family{ private final List<Person> familyMembers; } class Person{ String firstName, lastName; int age; }

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  • Print Preview Control used in a custom Print Preview Dialog.

    - by Kildareflare
    I have successfully implemented printing and print preview for my app using the PrintDocument, PrintDialog and PrintPreviewDialog classes of .NET. However my app uses a toolkit to improve the appearance of the standard .NET controls. There are versions of most .NET controls in the toolkit, but none for the Print controls. Therefore to ensure that the appearance of these controls matches the rest of the app I am creating a custom PrintPreviewDialog based on a toolkit form and embedding a .NET PrintPrewviewControl in it. My problem is that the PrintPreviewControl always shows "No pages to display". I had no trouble getting this to work using the .NET PrintPreviewDialog and cannot see what I am doing wrong. This is a .NET 2.0 PrintPreviewControl and so I know that I need to call InvalidatePreview() after assigning the PrintDocument. However it does not seem to matter where i place it, the PrintPage event handler never gets called... EDIT: I've just noticed that while the original PrintDocument m_printDocument shows a PrintPageHandler in its properties, the m_printPreviewControl.Document does not. Any ideas why it is being lost..? public class PrintEngine { ...rest of class... public PrintEngine() { m_printDoc.PrintPage += new PrintPageEventHandler(printDoc_PrintPage); } public void PrintPreview() { //ORIGINAL CODE USING .NET DIALOG WORK OK //PrintPreviewDialog dlg1 = new PrintPreviewDialog(); //dlg1.Document = m_printDoc; //PrepareImageForPrinting(); //dlg1.ShowDialog(); //CODE USING MY CUSTOM DIALOG DO NOT WORK? MyPrintPreviewDialog dlg2 = new MyPrintPreviewDialog(); dlg2.Document = m_printDoc; PrepareImageForPrinting(); //Creates the m_printImage List dlg2.ShowDialog(); } private void printDoc_PrintPage(object sender, PrintPageEventArgs e) { e.Graphics.DrawImage(m_printImages[m_currentPage], new Point(0, 0)); m_currentPage++; e.HasMorePages = m_currentPage < m_pagesHigh; } }//end PrintEngine class public class MyPrintPreviewDialog : KryptonForm { public PrintDocument Document { get { return m_printPreviewControl.Document; } set { m_printPreviewControl.Document = value; m_printPreviewControl.InvalidatePreview(); } } public MyPrintPreviewDialog() { InitializeComponent(); m_printPreviewControl = new PrintPreviewControl(); m_printPreviewControl.StartPage = 0; } private void MyPrintPreviewDialog_Load(object sender, EventArgs e) { m_printPreviewControl.Document.DefaultPageSettings = new PageSettings(); m_printPreviewControl.Document.PrinterSettings = new PrinterSettings(); m_printPreviewControl.InvalidatePreview(); } }//end MyPrintPreviewDialog class

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  • How to play multiple audio sources simultaneously in Silverlight

    - by Shurup
    I want to play simultaneous multiply audio sources in Silverlight. So I've created a prototype in Silverlight 4 that should play a two mp3 files containing the same ticks sound with an intervall 1 second. So these files must be sounded as one sound if they will be played together with any whole second offsets (0 and 1, 0 and 2, 1 and 1 seconds, etc.) I my prototype I use two MediaElement (me and me2) objects. DateTime startTime; private void Play_Clicked(object sender, RoutedEventArgs e) { me.SetSource(new FileStream(file1), FileMode.Open))); me2.SetSource(new FileStream(file2), FileMode.Open))); var timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(1) }; timer.Tick += RefreshData; timer.Start(); } First file should be played at 00:00 sec. and the second in 00:02 second. void RefreshData(object sender, EventArgs e) { if(me.CurrentState != MediaElementState.Playing) { startTime = DateTime.Now; me.Play(); return; } var elapsed = DateTime.Now - startTime; if(me2.CurrentState != MediaElementState.Playing && elapsed >= TimeSpan.FromSeconds(2)) { me2.Play(); ((DispatcherTimer)sender).Stop(); } } The tracks played every time different and not simultaneous as they should (as one sound). Addition: I've tested a code from the Bobby's answer. private void Play_Clicked(object sender, RoutedEventArgs e) { me.SetSource(new FileStream(file1), FileMode.Open))); me2.SetSource(new FileStream(file2), FileMode.Open))); // This code plays well enough. // me.Play(); // me2.Play(); // But adding the 2 second offset using the timer, // they play no simultaneous. var timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(2) }; timer.Tick += (source, arg) => { me2.Play(); ((DispatcherTimer)source).Stop(); }; timer.Start(); } Is it possible to play them together using only one MediaElement or any implementation of MediaStreamSource that can play multiply sources?

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  • My ashx stopped working (Works locally, but not online)

    - by Madi D.
    i have a simple ASHX file that returns pictures upon request (mainly a counter), previously the code simply fetched pre-made pictures(already uploaded and available) and sent them to the requester.. i just modified the code,so it would take a base picture, do some modifications on it, save it to the server, then serve it to the user.. tested it locally and it worked like a charm. however when i uploaded the code to my hosting service (Godaddy..) it didnt work. Can someone point the problem out to me? Note: ASHX worked with me before,so i know the web.config and IIS are handling them properly, however i think i am missing something .. Code: <%@ WebHandler Language="C#" Class="NWEmpPhotoHandler" %> using System; using System.Web; using System.IO; using System.Drawing; using System.Drawing.Imaging; public class NWEmpPhotoHandler : IHttpHandler { public bool IsReusable { get { return true; } } public void ProcessRequest(HttpContext ctx) { try { //Some Code to fetch # of vistors from DB int x = 10,000; // # of Vistors, fetched from DB string numberOfVistors = (1000 + x).ToString(); string filePath = ctx.Server.MapPath("counter.jpg"); Bitmap myBitmap = new Bitmap(filePath); Graphics g = Graphics.FromImage(myBitmap); g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; StringFormat strFormat = new StringFormat(); g.DrawString(numberOfVistors , new Font("Tahoma", 24), Brushes.Maroon, new RectangleF(55, 82, 500, 500),null); string PathToSave = ctx.Server.MapPath("counter-" + numberOfVistors + ".jpg"); saveJpeg(PathToSave, myBitmap, 100); if (File.Exists(PathToSave)) { ctx.Response.ContentType = "image/jpg"; ctx.Response.WriteFile(PathToSave); //ctx.Response.OutputStream.Write(picByteArray, 0, picByteArray.Length); } } catch (ArgumentException exe) { } } private ImageCodecInfo getEncoderInfo(string mimeType) { // Get image codecs for all image formats ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders(); // Find the correct image codec for (int i = 0; i < codecs.Length; i++) if (codecs[i].MimeType == mimeType) return codecs[i]; return null; } private void saveJpeg(string path, Bitmap img, long quality) { // Encoder parameter for image quality EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, quality); // Jpeg image codec ImageCodecInfo jpegCodec = this.getEncoderInfo("image/jpeg"); if (jpegCodec == null) return; EncoderParameters encoderParams = new EncoderParameters(1); encoderParams.Param[0] = qualityParam; img.Save(path, jpegCodec, encoderParams); } }

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  • practical security ramifications of increasing WCF clock skew to more than an hour

    - by Andrew Patterson
    I have written a WCF service that returns 'semi-private' data concerning peoples name, addresses and phone numbers. By semi-private, I mean that there is a username and password to access the data, and the data is meant to be secured in transit. However, IMHO noone is going to expend any energy trying to obtain the data, as it is mostly available in the public phone book anyway etc. At some level, the security is a bit of security 'theatre' to tick some boxes imposed on us by government entities. The client end of the service is an application which is given out to registered 'users' to run within their own IT setups. We have no control over the IT of the users - and in fact they often tell us to 'go jump' if we put too many requirements on their systems. One problem we have been encountering is numerous users that have system clocks that are not accurate. This can either be caused by a genuine slow/fast clocks, or more than likely a timezone or daylight savings zone error (putting their machine an hour off the 'real' time). A feature of the WCF bindings we are using is that they rely on the notion of time to detect replay attacks etc. <wsHttpBinding> <binding name="normalWsBinding" maxBufferPoolSize="524288" maxReceivedMessageSize="655360"> <reliableSession enabled="false" /> <security mode="Message"> <message clientCredentialType="UserName" negotiateServiceCredential="false" algorithmSuite="Default" establishSecurityContext="false" /> </security> </binding> </wsHttpBinding> The inaccurate client clocks cause security exceptions to be thrown and unhappy users. Other than suggesting users correct their clocks, we know that we can increase the clock skew of the security bindings. http://www.danrigsby.com/blog/index.php/2008/08/26/changing-the-default-clock-skew-in-wcf/ My question is, what are the real practical security ramifications of increasing the skew to say 2 hours? If an attacker can perform some sort of replay attack, why would a clock skew window of 5 minutes be necessarily safer than 2 hours? I presume performing any attack with security mode of 'message' requires more than just capturing some data at a proxy and sending the data back in again to 'replay' the call? In a situation like mine where data is only 'read' by the users, are there indeed any security ramifications at all to allowing 'replay' attacks?

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  • C# SerialPort - Problems mixing ports with different baud rates.

    - by GrandAdmiral
    Greetings, I have two devices that I would like to connect over a serial interface, but they have incompatible connections. To get around this problem, I connected them both to my PC and I'm working on a C# program that will route traffic on COM port X to COM port Y and vice versa. The program connects to two COM ports. In the data received event handler, I read in incoming data and write it to the other COM port. To do this, I have the following code: private void HandleDataReceived(SerialPort inPort, SerialPort outPort) { byte[] data = new byte[1]; while (inPort.BytesToRead > 0) { // Read the data data[0] = (byte)inPort.ReadByte(); // Write the data if (outPort.IsOpen) { outPort.Write(data, 0, 1); } } } That code worked fine as long as the outgoing COM port operated at a higher baud rate than the incoming COM port. If the incoming COM port was faster than the outgoing COM port, I started missing data. I had to correct the code like this: private void HandleDataReceived(SerialPort inPort, SerialPort outPort) { byte[] data = new byte[1]; while (inPort.BytesToRead > 0) { // Read the data data[0] = (byte)inPort.ReadByte(); // Write the data if (outPort.IsOpen) { outPort.Write(data, 0, 1); while (outPort.BytesToWrite > 0); //<-- Change to fix problem } } } I don't understand why I need that fix. I'm new to C# (this is my first program), so I'm wondering if there is something I am missing. The SerialPort defaults to a 2048 byte write buffer and my commands are less than ten bytes. The write buffer should have the ability to buffer the data until it can be written to a slower COM port. In summary, I'm receiving data on COM X and writing the data to COM Y. COM X is connected at a faster baud rate than COM Y. Why doesn't the buffering in the write buffer handle this difference? Why does it seem that I need to wait for the write buffer to drain to avoid losing data? Thanks!

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  • SIMPLE OpenSSL RSA Encryption in C/C++ is causing me headaches

    - by Josh
    Hey guys, I'm having some trouble figuring out how to do this. Basically I just want a client and server to be able to send each other encrypted messages. This is going to be incredibly insecure because I'm trying to figure this all out so I might as well start at the ground floor. So far I've got all the keys working but encryption/decryption is giving me hell. I'll start by saying I am using C++ but most of these functions require C strings so whatever I'm doing may be causing problems. Note that on the client side I receive the following error in regards to decryption. error:04065072:rsa routines:RSA_EAY_PRIVATE_DECRYPT:padding check failed I don't really understand how padding works so I don't know how to fix it. Anywho here are the relevant variables on each side followed by the code. Client: RSA *myKey; // Loaded with private key // The below will hold the decrypted message unsigned char* decrypted = (unsigned char*) malloc(RSA_size(myKey)); /* The below holds the encrypted string received over the network. Originally held in a C-string but C strings never work for me and scare me so I put it in a C++ string */ string encrypted; // The reinterpret_cast line was to get rid of an error message. // Maybe the cause of one of my problems? if(RSA_private_decrypt(sizeof(encrypted.c_str()), reinterpret_cast<const unsigned char*>(encrypted.c_str()), decrypted, myKey, RSA_PKCS1_OAEP_PADDING)==-1) { cout << "Private decryption failed" << endl; ERR_error_string(ERR_peek_last_error(), errBuf); printf("Error: %s\n", errBuf); free(decrypted); exit(1); } Server: RSA *pkey; // Holds the client's public key string key; // Holds a session key I want to encrypt and send //The below will hold the encrypted message unsigned char *encrypted = (unsigned char*)malloc(RSA_size(pkey)); // The reinterpret_cast line was to get rid of an error message. // Maybe the cause of one of my problems? if(RSA_public_encrypt(sizeof(key.c_str()), reinterpret_cast<const unsigned char*>(key.c_str()), encrypted, pkey, RSA_PKCS1_OAEP_PADDING)==-1) { cout << "Public encryption failed" << endl; ERR_error_string(ERR_peek_last_error(), errBuf); printf("Error: %s\n", errBuf); free(encrypted); exit(1); } Let me once again state, in case I didn't before, that I know my code sucks but I'm just trying to establish a framework for understanding this. I'm sorry if this offends you veteran coders. Thanks in advance for any help you guys can provide!

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  • Switching from MDI to SDI and Back Again

    - by Mike Hofer
    This sounds like it would be a simple task, but I'm running into some issues. I have some fairly straightforward code for my C# application: private void SwitchToSdi() { MainWindow mainWindow = GetMainWindow(); for (int index = mainWindow.MdiChildren.Length - 1; index >= 0; index--) { Form form = mainWindow.MdiChildren[index]; if (!(form is MainWindow)) { form.Visible = false; form.MdiParent = null; form.Visible = true; mainWindow.MdiChildren[index] = null; } } mainWindow.IsMdiContainer = false; } And then, private void SwitchToMdi() { MainWindow mainWindow = GetMainWindow(); mainWindow.IsMdiContainer = true; for (int index = Application.OpenForms.Count - 1; index >= 0; index--) { Form form = Application.OpenForms[index]; if (!(form is MainWindow)) { form.Visible = false; form.MdiParent = mainWindow; form.Visible = true; } } } Note that MainWindow is an MDI parent window, with its IsMdiContainer property set to True. The user can toggle between MDI and SDI in the Options dialog. That much works beautifully. If I switch to SDI, the new windows open up OUTSIDE the main window, which is great. Similarly, if I switch to MDI, they open up inside the container. However, I've noticed a few things. Open MDI child windows don't become SDI windows as I would have expected them to. Open SDI windows don't become MDI child windows as I would have expected them to. Even after I set IsMdiContainer to true in the call to SwitchToMdi(), if I try to open a new window, I get an exception that tells me that the main window isn't an MDI container. o_O Someone please throw me a bone here. This shouldn't be rocket science. But I'm not finding a whole lot of useful help out there on the Intarwebs (read: g00gle is fairly useless). Has anyone actually implemented this behavior in .NET before? How did you achieve it? What am I missing here? Halp!

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  • Silverlight with Visual Studio 2010 Isolated Storage Error

    - by Greg Finzer
    I am getting an error when trying to access isolated storage when running a Silverlight unit test project in VS2010. Test method Silverlight_Binary_Serialization_Tests.SerializationTests.SerializeBytesTest threw exception: System.IO.IsolatedStorage.IsolatedStorageException: Unable to determine application identity of the caller. Here is the line it is failing on: private readonly IsolatedStorageFile _store = IsolatedStorageFile.GetUserStoreForApplication();

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  • VB restart form

    - by hiba salem
    I created a button and I need it to restart the form I have no idea how to work on the sily visual basic what should i write Private Sub Button2_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click End Sub

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  • Groovy syntax <? , <?>>

    - by bsreekanth
    Hello, I was going through one of the answer in SO, where I see the following syntax private Class<? extends Enum<?>> clazz what all the <? , <?>> expression means. Looks like generalize the implementation based on regex kind of expression. What is it called in Groovy... many thanks..

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