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• Connected host failed to respond (internal NAT address)

  - by MostRandom

  I'm writing my first C# web application that connects to an XML based service. It requires that I present a certificate and feed the XML stream. It seems to authenticate properly but then it gives the following error: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 10.1.10.4:3128 The funny thing is that I'm not on a proxy or anything like that. I'm connecting directly to the internet. At one point I we did use a proxy that with internal NAT address. So my question is: Does Visual Studio have some sort of default proxy setting that I need to change? This IP is no longer used for anything, so I know that I don't need to use any proxy authentication code. using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Net; using System.Security.Cryptography.X509Certificates; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; namespace WebApplication1 { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Uri requestURI = new Uri("*site omitted*"); //Create the Request Object HttpWebRequest pageRequest = (HttpWebRequest)WebRequest.Create(requestURI); //After installing the cert on the server export a client cert to the working directory as Deluxe.cer string certFile = "*certificate omitted*"; X509Certificate cert = X509Certificate.CreateFromCertFile(certFile); //Pull in your Data, if it is from an external xml as below or create an xml string with variables if a dynamic post is required. string xmlPath = "*XML omitted*"; System.Xml.XmlDocument passXML = new System.Xml.XmlDocument(); passXML.Load(xmlPath); //XML String with the data needed to pass string postData = passXML.OuterXml; //Set the Request Object parameters pageRequest.ContentType = "application/x-www-form-urlencoded"; pageRequest.Method = "POST"; pageRequest.AllowWriteStreamBuffering = false; pageRequest.AllowAutoRedirect = false; pageRequest.ClientCertificates.Add(cert); postData = "xml_data=" + Server.UrlEncode(postData); pageRequest.ContentLength = postData.Length; //Create the Post Stream Object System.IO.StreamWriter postStream = new System.IO.StreamWriter(pageRequest.GetRequestStream()); //Write the data to the post stream postStream.Write(postData); postStream.Flush(); postStream.Close(); //Set the Response Object HttpWebResponse postResponse = (HttpWebResponse)pageRequest.GetResponse();

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• Compile error C++: could not deduce template argument for 'T'

  - by OneShot

  I'm trying to read binary data to load structs back into memory so I can edit them and save them back to the .dat file. readVector() attempts to read the file, and return the vectors that were serialized. But i'm getting this compile error when I try and run it. What am I doing wrong with my templates? ***** EDIT ************** Code: // Project 5.cpp : main project file. #include "stdafx.h" #include <iostream> #include <fstream> #include <string> #include <vector> #include <algorithm> using namespace System; using namespace std; #pragma hdrstop int checkCommand (string line); template<typename T> void writeVector(ofstream &out, const vector<T> &vec); template<typename T> vector<T> readVector(ifstream &in); struct InventoryItem { string Item; string Description; int Quantity; int wholesaleCost; int retailCost; int dateAdded; } ; int main(void) { cout << "Welcome to the Inventory Manager extreme! [Version 1.0]" << endl; ifstream in("data.dat"); vector<InventoryItem> structList; readVector<InventoryItem>( in ); while (1) { string line = ""; cout << endl; cout << "Commands: " << endl; cout << "1: Add a new record " << endl; cout << "2: Display a record " << endl; cout << "3: Edit a current record " << endl; cout << "4: Exit the program " << endl; cout << endl; cout << "Enter a command 1-4: "; getline(cin , line); int rValue = checkCommand(line); if (rValue == 1) { cout << "You've entered a invalid command! Try Again." << endl; } else if (rValue == 2){ cout << "Error calling command!" << endl; } else if (!rValue) { break; } } system("pause"); return 0; } int checkCommand (string line) { int intReturn = atoi(line.c_str()); int status = 3; switch (intReturn) { case 1: break; case 2: break; case 3: break; case 4: status = 0; break; default: status = 1; break; } return status; } template<typename T> void writeVector(ofstream &out, const vector<T> &vec) { out << vec.size(); for(vector<T>::const_iterator i = vec.begin(); i != vec.end(); i++) { out << *i; } } ostream& operator<<(std::ostream &strm, const InventoryItem &i) { return strm << i.Item << " (" << i.Description << ")"; } template<typename T> vector<T> readVector(ifstream &in) { size_t size; in >> size; vector<T> vec; vec.reserve(size); for(int i = 0; i < size; i++) { T tmp; in >> tmp; vec.push_back(tmp); } return vec; } Compiler errors: 1>------ Build started: Project: Project 5, Configuration: Debug Win32 ------ 1>Compiling... 1>Project 5.cpp 1>.\Project 5.cpp(124) : warning C4018: '<' : signed/unsigned mismatch 1> .\Project 5.cpp(40) : see reference to function template instantiation 'std::vector<_Ty> readVector<InventoryItem>(std::ifstream &)' being compiled 1> with 1> [ 1> _Ty=InventoryItem 1> ] 1>.\Project 5.cpp(127) : error C2679: binary '>>' : no operator found which takes a right-hand operand of type 'InventoryItem' (or there is no acceptable conversion) 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(1144): could be 'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,signed char *)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(1146): or 'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,signed char &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(1148): or 'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,unsigned char *)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(1150): or 'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,unsigned char &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(155): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_istream<_Elem,_Traits> &(__cdecl *)(std::basic_istream<_Elem,_Traits> &))' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(161): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_ios<_Elem,_Traits> &(__cdecl *)(std::basic_ios<_Elem,_Traits> &))' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(168): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::ios_base &(__cdecl *)(std::ios_base &))' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(175): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::_Bool &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(194): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(short &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(228): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned short &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(247): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(int &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(273): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned int &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(291): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(long &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(309): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(__w64 unsigned long &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(329): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(__int64 &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(348): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned __int64 &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(367): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(float &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(386): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(double &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(404): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(long double &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(422): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(void *&)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(441): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_streambuf<_Elem,_Traits> *)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> while trying to match the argument list '(std::ifstream, InventoryItem)' 1>Build log was saved at "file://c:\Users\Owner\Documents\Visual Studio 2008\Projects\Project 5\Project 5\Debug\BuildLog.htm" 1>Project 5 - 1 error(s), 1 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== Oh my god...I fixed that error I think and now I got another one. Will you PLEASE just help me on this one too! What the heck does this mean ??

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• Detect Client Computer name when an RDP session is open

  - by Ubiquitous Che

  Hey all, My manager has pointed out to me a few nifty things that one of our accounting applications can do because it can load different settings based on the machine name of the host and the machine name of the client when the package is opened in an RDP session. We want to provide similar functionality in one of my company's applications. I've found out on this site how to detect if I'm in an RDP session, but I'm having trouble finding information anywhere on how to detect the name of the client computer. Any pointers in the right direction would be great. I'm coding in C# for .NET 3.5 EDIT The sample code I cobbled together from the advice below - it should be enough for anyone who has a use for the WTSQuerySessionInformation to get a feel for what's going on. Note that this isn't necessarily the best way of doing it - just a starting point that I've found useful. When I run this locally, I get boring, expected answers. When I run it on our local office server in an RDP session, I see my own computer name in the WTSClientName property. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; namespace TerminalServicesTest { class Program { const int WTS_CURRENT_SESSION = -1; static readonly IntPtr WTS_CURRENT_SERVER_HANDLE = IntPtr.Zero; static void Main(string[] args) { StringBuilder sb = new StringBuilder(); uint byteCount; foreach (WTS_INFO_CLASS item in Enum.GetValues(typeof(WTS_INFO_CLASS))) { Program.WTSQuerySessionInformation( WTS_CURRENT_SERVER_HANDLE, WTS_CURRENT_SESSION, item, out sb, out byteCount); Console.WriteLine("{0}({1}): {2}", item.ToString(), byteCount, sb); } Console.WriteLine(); Console.WriteLine("Press any key to exit..."); Console.ReadKey(); } [DllImport("Wtsapi32.dll")] public static extern bool WTSQuerySessionInformation( IntPtr hServer, int sessionId, WTS_INFO_CLASS wtsInfoClass, out StringBuilder ppBuffer, out uint pBytesReturned); } enum WTS_INFO_CLASS { WTSInitialProgram = 0, WTSApplicationName = 1, WTSWorkingDirectory = 2, WTSOEMId = 3, WTSSessionId = 4, WTSUserName = 5, WTSWinStationName = 6, WTSDomainName = 7, WTSConnectState = 8, WTSClientBuildNumber = 9, WTSClientName = 10, WTSClientDirectory = 11, WTSClientProductId = 12, WTSClientHardwareId = 13, WTSClientAddress = 14, WTSClientDisplay = 15, WTSClientProtocolType = 16, WTSIdleTime = 17, WTSLogonTime = 18, WTSIncomingBytes = 19, WTSOutgoingBytes = 20, WTSIncomingFrames = 21, WTSOutgoingFrames = 22, WTSClientInfo = 23, WTSSessionInfo = 24, WTSSessionInfoEx = 25, WTSConfigInfo = 26, WTSValidationInfo = 27, WTSSessionAddressV4 = 28, WTSIsRemoteSession = 29 } }

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• Help with a logic problem

  - by Stradigos

  I'm having a great deal of difficulty trying to figure out the logic behind this problem. I have developed everything else, but I really could use some help, any sort of help, on the part I'm stuck on. Back story: *A group of actors waits in a circle. They "count off" by various amounts. The last few to audition are thought to have the best chance of getting the parts and becoming stars. Instead of actors having names, they are identified by numbers. The "Audition Order" in the table tells, reading left-to-right, the "names" of the actors who will be auditioned in the order they will perform.* Sample output: etc, all the way up to 10. What I have so far: using System; using System.Collections; using System.Text; namespace The_Last_Survivor { class Program { static void Main(string[] args) { //Declare Variables int NumOfActors = 0; System.DateTime dt = System.DateTime.Now; int interval = 3; ArrayList Ring = new ArrayList(10); //Header Console.Out.WriteLine("Actors\tNumber\tOrder"); //Add Actors for (int x = 1; x < 11; x++) { NumOfActors++; Ring.Insert((x - 1), new Actor(x)); foreach (Actor i in Ring) { Console.Out.WriteLine("{0}\t{1}\t{2}", NumOfActors, i, i.Order(interval, x)); } Console.Out.WriteLine("\n"); } Console.In.Read(); } public class Actor { //Variables protected int Number; //Constructor public Actor(int num) { Number = num; } //Order in circle public string Order(int inter, int num) { //Variable string result = ""; ArrayList myArray = new ArrayList(num); //Filling Array for (int i = 0; i < num; i++) myArray.Add(i + 1); //Formula foreach (int element in myArray) { if (element == inter) { result += String.Format(" {0}", element); myArray.RemoveAt(element); } } return result; } //String override public override string ToString() { return String.Format("{0}", Number); } } } } The part I'm stuck on is getting some math going that does this: Can anyone offer some guidance and/or sample code?

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• Custom Windows Forms Control not exporting functions, not showing in tools list, showing as Text

  - by flavour404

  Hi, I have written a very simple control. C# Visual Studio 2008. Its output should be, and is a dll. I have added a reference to the dll within the project that I intend to use it with. The msdn article about how to write a control states that it should appear in the 'Add reference / projects' list, which it doesn't but I simply navigated to it under the 'browse' tab, went to the /bin folder and added the reference that way. I dragged it over to my toolbox, but it shows up as a 'Text:xhair_tool' and when i try and add it to a form, it won't, so what have I done wrong? It was created as a 'Windows forms control' project. It should export the one method which is 'Target' which return an array, as shown below. using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Text; using System.Windows.Forms; namespace xhair_tool { public partial class xhair : UserControl { public xhair() { InitializeComponent(); } private void xhair_Load(object sender, EventArgs e) { } protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; Pen pen = new Pen(Color.Black, 1); SolidBrush redBrush = new SolidBrush(Color.Red); g.DrawLine(pen, 8, 0, 8, 7); g.DrawLine(pen, 8, 9, 8, 16); g.DrawLine(pen, 0, 8, 7, 8); g.DrawLine(pen, 9, 8, 16, 8); //ControlPaint.DrawReversibleLine(start, end, backColor) } /// <summary> /// Returns the point at the center of the crosshair /// </summary> /// <returns>int[x,y]</returns> public int[] Target { get { int[] _xy = new int[2]; _xy[0] = this.Left + 8; _xy[1] = this.Top + 8; return _xy; } } } } Thanks, R.

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• Parsing a .NET DataSet returned from a .NET Web Service in Java

  - by Chris Dail

  I have to consume a .NET hosted web service from a Java application. Interoperability between the two is usually very good. The problem I'm running into is that the .NET application developer chose to expose data using the .NET DataSet object. There are lots of articles written as to why you should not do this and how it makes interoperability difficult: http://www.hanselman.com/blog/ReturningDataSetsFromWebServicesIsTheSpawnOfSatanAndRepresentsAllThatIsTrulyEvilInTheWorld.aspx http://www.lhotka.net/weblog/ThoughtsOnPassingDataSetObjectsViaWebServices.aspx http://aspnet.4guysfromrolla.com/articles/051805-1.aspx http://www.theserverside.net/tt/articles/showarticle.tss?id=Top5WSMistakes My problem is that despite this not being recommended practice, I am stuck with having to consume a web service returning a DataSet with Java. When you generate a proxy for something like this with anything other than .NET you basically end up with an object that looks like this: @XmlElement(namespace = "http://www.w3.org/2001/XMLSchema", required = true) protected Schema schema; @XmlAnyElement(lax = true) protected Object any; This first field is the actual schema that should describe the DataSet. When I process this using JAX-WS and JAXB in Java, it bring all of XS-Schema in as Java objects to be represented here. Walking the object tree of JAXB is possible but not pretty. The any field represents the raw XML for the DataSet that is in the schema specified by the schema. The structure of the dataset is pretty consistent but the data types do change. I need access to the type information and the schema does vary from call to call. I've though of a few options but none seem like 'good' options. Trying to generate Java objects from the schema using JAXB at runtime seems to be a bad idea. This would be way too slow since it would need to happen everytime. Brute force walk the schema tree using the JAXB objects that JAX-WS brought in. Maybe instead of using JAXB to parse the schema it would be easier to deal with it as XML and use XPath to try and find the type information I need. Are there other options I have not considered? Is there a Java library to parse DataSet objects easily? What have other people done who may have similar situations?

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• Using a type parameter and a pointer to the same type parameter in a function template

  - by Darel

  Hello, I've written a template function to determine the median of any vector or array of any type that can be sorted with sort. The function and a small test program are below: #include <algorithm> #include <vector> #include <iostream> using namespace::std; template <class T, class X> void median(T vec, size_t size, X& ret) { sort(vec, vec + size); size_t mid = size/2; ret = size % 2 == 0 ? (vec[mid] + vec[mid-1]) / 2 : vec[mid]; } int main() { vector<double> v; v.push_back(2); v.push_back(8); v.push_back(7); v.push_back(4); v.push_back(9); double a[5] = {2, 8, 7, 4, 9}; double r; median(v.begin(), v.size(), r); cout << r << endl; median(a, 5, r); cout << r << endl; return 0; } As you can see, the median function takes a pointer as an argument, T vec. Also in the argument list is a reference variable X ret, which is modified by the function to store the computed median value. However I don't find this a very elegant solution. T vec will always be a pointer to the same type as X ret. My initial attempts to write median had a header like this: template<class T> T median(T *vec, size_t size) { sort(vec, vec + size); size_t mid = size/2; return size % 2 == 0 ? (vec[mid] + vec[mid-1]) / 2 : vec[mid]; } I also tried: template<class T, class X> X median(T vec, size_t size) { sort(vec, vec + size); size_t mid = size/2; return size % 2 == 0 ? (vec[mid] + vec[mid-1]) / 2 : vec[mid]; } I couldn't get either of these to work. My question is, can anyone show me a working implementation of either of my alternatives? Thanks for looking!

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• C++ - Conway's Game of Life & Stepping Backwards

  - by Gabe

  I was able to create a version Conway's Game of Life that either stepped forward each click, or just ran forward using a timer. (I'm doing this using Qt.) Now, I need to be able to save all previous game grids, so that I can step backwards by clicking a button. I'm trying to use a stack, and it seems like I'm pushing the old gridcells onto the stack correctly. But when I run it in QT, the grids don't change when I click BACK. I've tried different things for the last three hours, to no avail. Any ideas? gridwindow.cpp - My problem should be in here somewhere. Probably the handleBack() func. #include <iostream> #include "gridwindow.h" using namespace std; // Constructor for window. It constructs the three portions of the GUI and lays them out vertically. GridWindow::GridWindow(QWidget *parent,int rows,int cols) : QWidget(parent) { QHBoxLayout *header = setupHeader(); // Setup the title at the top. QGridLayout *grid = setupGrid(rows,cols); // Setup the grid of colored cells in the middle. QHBoxLayout *buttonRow = setupButtonRow(); // Setup the row of buttons across the bottom. QVBoxLayout *layout = new QVBoxLayout(); // Puts everything together. layout->addLayout(header); layout->addLayout(grid); layout->addLayout(buttonRow); setLayout(layout); } // Destructor. GridWindow::~GridWindow() { delete title; } // Builds header section of the GUI. QHBoxLayout* GridWindow::setupHeader() { QHBoxLayout *header = new QHBoxLayout(); // Creates horizontal box. header->setAlignment(Qt::AlignHCenter); this->title = new QLabel("CONWAY'S GAME OF LIFE",this); // Creates big, bold, centered label (title): "Conway's Game of Life." this->title->setAlignment(Qt::AlignHCenter); this->title->setFont(QFont("Arial", 32, QFont::Bold)); header->addWidget(this->title); // Adds widget to layout. return header; // Returns header to grid window. } // Builds the grid of cells. This method populates the grid's 2D array of GridCells with MxN cells. QGridLayout* GridWindow::setupGrid(int rows,int cols) { isRunning = false; QGridLayout *grid = new QGridLayout(); // Creates grid layout. grid->setHorizontalSpacing(0); // No empty spaces. Cells should be contiguous. grid->setVerticalSpacing(0); grid->setSpacing(0); grid->setAlignment(Qt::AlignHCenter); for(int i=0; i < rows; i++) //Each row is a vector of grid cells. { std::vector<GridCell*> row; // Creates new vector for current row. cells.push_back(row); for(int j=0; j < cols; j++) { GridCell *cell = new GridCell(); // Creates and adds new cell to row. cells.at(i).push_back(cell); grid->addWidget(cell,i,j); // Adds to cell to grid layout. Column expands vertically. grid->setColumnStretch(j,1); } grid->setRowStretch(i,1); // Sets row expansion horizontally. } return grid; // Returns grid. } // Builds footer section of the GUI. QHBoxLayout* GridWindow::setupButtonRow() { QHBoxLayout *buttonRow = new QHBoxLayout(); // Creates horizontal box for buttons. buttonRow->setAlignment(Qt::AlignHCenter); // Clear Button - Clears cell; sets them all to DEAD/white. QPushButton *clearButton = new QPushButton("CLEAR"); clearButton->setFixedSize(100,25); connect(clearButton, SIGNAL(clicked()), this, SLOT(handlePause())); // Pauses timer before clearing. connect(clearButton, SIGNAL(clicked()), this, SLOT(handleClear())); // Connects to clear function to make all cells DEAD/white. buttonRow->addWidget(clearButton); // Forward Button - Steps one step forward. QPushButton *forwardButton = new QPushButton("FORWARD"); forwardButton->setFixedSize(100,25); connect(forwardButton, SIGNAL(clicked()), this, SLOT(handleForward())); // Signals to handleForward function.. buttonRow->addWidget(forwardButton); // Back Button - Steps one step backward. QPushButton *backButton = new QPushButton("BACK"); backButton->setFixedSize(100,25); connect(backButton, SIGNAL(clicked()), this, SLOT(handleBack())); // Signals to handleBack funciton. buttonRow->addWidget(backButton); // Start Button - Starts game when user clicks. Or, resumes game after being paused. QPushButton *startButton = new QPushButton("START/RESUME"); startButton->setFixedSize(100,25); connect(startButton, SIGNAL(clicked()), this, SLOT(handlePause())); // Deletes current timer if there is one. Then restarts everything. connect(startButton, SIGNAL(clicked()), this, SLOT(handleStart())); // Signals to handleStart function. buttonRow->addWidget(startButton); // Pause Button - Pauses simulation of game. QPushButton *pauseButton = new QPushButton("PAUSE"); pauseButton->setFixedSize(100,25); connect(pauseButton, SIGNAL(clicked()), this, SLOT(handlePause())); // Signals to pause function which pauses timer. buttonRow->addWidget(pauseButton); // Quit Button - Exits program. QPushButton *quitButton = new QPushButton("EXIT"); quitButton->setFixedSize(100,25); connect(quitButton, SIGNAL(clicked()), qApp, SLOT(quit())); // Signals the quit slot which ends the program. buttonRow->addWidget(quitButton); return buttonRow; // Returns bottom of layout. } /* SLOT method for handling clicks on the "clear" button. Receives "clicked" signals on the "Clear" button and sets all cells to DEAD. */ void GridWindow::handleClear() { for(unsigned int row=0; row < cells.size(); row++) // Loops through current rows' cells. { for(unsigned int col=0; col < cells[row].size(); col++) // Loops through the rows'columns' cells. { GridCell *cell = cells[row][col]; // Grab the current cell & set its value to dead. cell->setType(DEAD); } } } /* SLOT method for handling clicks on the "start" button. Receives "clicked" signals on the "start" button and begins game simulation. */ void GridWindow::handleStart() { isRunning = true; // It is running. Sets isRunning to true. this->timer = new QTimer(this); // Creates new timer. connect(this->timer, SIGNAL(timeout()), this, SLOT(timerFired())); // Connect "timerFired" method class to the "timeout" signal fired by the timer. this->timer->start(500); // Timer to fire every 500 milliseconds. } /* SLOT method for handling clicks on the "pause" button. Receives "clicked" signals on the "pause" button and stops the game simulation. */ void GridWindow::handlePause() { if(isRunning) // If it is running... this->timer->stop(); // Stops the timer. isRunning = false; // Set to false. } void GridWindow::handleForward() { if(isRunning); // If it's running, do nothing. else timerFired(); // It not running, step forward one step. } void GridWindow::handleBack() { std::vector<std::vector<GridCell*> > cells2; if(isRunning); // If it's running, do nothing. else if(backStack.empty()) cout << "EMPTYYY" << endl; else { cells2 = backStack.peek(); for (unsigned int f = 0; f < cells.size(); f++) // Loop through cells' rows. { for (unsigned int g = 0; g < cells.at(f).size(); g++) // Loop through cells columns. { cells[f][g]->setType(cells2[f][g]->getType()); // Set cells[f][g]'s type to cells2[f][g]'s type. } } cout << "PRE=POP" << endl; backStack.pop(); cout << "OYYYY" << endl; } } // Accessor method - Gets the 2D vector of grid cells. std::vector<std::vector<GridCell*> >& GridWindow::getCells() { return this->cells; } /* TimerFired function: 1) 2D-Vector cells2 is declared. 2) cells2 is initliazed with loops/push_backs so that all its cells are DEAD. 3) We loop through cells, and count the number of LIVE neighbors next to a given cell. --> Depending on how many cells are living, we choose if the cell should be LIVE or DEAD in the next simulation, according to the rules. -----> We save the cell type in cell2 at the same indice (the same row and column cell in cells2). 4) After check all the cells (and save the next round values in cells 2), we set cells's gridcells equal to cells2 gridcells. --> This causes the cells to be redrawn with cells2 types (white or black). */ void GridWindow::timerFired() { backStack.push(cells); std::vector<std::vector<GridCell*> > cells2; // Holds new values for 2D vector. These are the next simulation round of cell types. for(unsigned int i = 0; i < cells.size(); i++) // Loop through the rows of cells2. (Same size as cells' rows.) { vector<GridCell*> row; // Creates Gridcell* vector to push_back into cells2. cells2.push_back(row); // Pushes back row vectors into cells2. for(unsigned int j = 0; j < cells[i].size(); j++) // Loop through the columns (the cells in each row). { GridCell *cell = new GridCell(); // Creates new GridCell. cell->setType(DEAD); // Sets cell type to DEAD/white. cells2.at(i).push_back(cell); // Pushes back the DEAD cell into cells2. } // This makes a gridwindow the same size as cells with all DEAD cells. } for (unsigned int m = 0; m < cells.size(); m++) // Loop through cells' rows. { for (unsigned int n = 0; n < cells.at(m).size(); n++) // Loop through cells' columns. { unsigned int neighbors = 0; // Counter for number of LIVE neighbors for a given cell. // We know check all different variations of cells[i][j] to count the number of living neighbors for each cell. // We check m > 0 and/or n > 0 to make sure we don't access negative indexes (ex: cells[-1][0].) // We check m < size to make sure we don't try to access rows out of the vector (ex: row 5, if only 4 rows). // We check n < row size to make sure we don't access column item out of the vector (ex: 10th item in a column of only 9 items). // If we find that the Type = 1 (it is LIVE), then we add 1 to the neighbor. // Else - we add nothing to the neighbor counter. // Neighbor is the number of LIVE cells next to the current cell. if(m > 0 && n > 0) { if (cells[m-1][n-1]->getType() == 1) neighbors += 1; } if(m > 0) { if (cells[m-1][n]->getType() == 1) neighbors += 1; if(n < (cells.at(m).size() - 1)) { if (cells[m-1][n+1]->getType() == 1) neighbors += 1; } } if(n > 0) { if (cells[m][n-1]->getType() == 1) neighbors += 1; if(m < (cells.size() - 1)) { if (cells[m+1][n-1]->getType() == 1) neighbors += 1; } } if(n < (cells.at(m).size() - 1)) { if (cells[m][n+1]->getType() == 1) neighbors += 1; } if(m < (cells.size() - 1)) { if (cells[m+1][n]->getType() == 1) neighbors += 1; } if(m < (cells.size() - 1) && n < (cells.at(m).size() - 1)) { if (cells[m+1][n+1]->getType() == 1) neighbors += 1; } // Done checking number of neighbors for cells[m][n] // Now we change cells2 if it should switch in the next simulation step. // cells2 holds the values of what cells should be on the next iteration of the game. // We can't change cells right now, or it would through off our other cell values. // Apply game rules to cells: Create new, updated grid with the roundtwo vector. // Note - LIVE is 1; DEAD is 0. if (cells[m][n]->getType() == 1 && neighbors < 2) // If cell is LIVE and has less than 2 LIVE neighbors -> Set to DEAD. cells2[m][n]->setType(DEAD); else if (cells[m][n]->getType() == 1 && neighbors > 3) // If cell is LIVE and has more than 3 LIVE neighbors -> Set to DEAD. cells2[m][n]->setType(DEAD); else if (cells[m][n]->getType() == 1 && (neighbors == 2 || neighbors == 3)) // If cell is LIVE and has 2 or 3 LIVE neighbors -> Set to LIVE. cells2[m][n]->setType(LIVE); else if (cells[m][n]->getType() == 0 && neighbors == 3) // If cell is DEAD and has 3 LIVE neighbors -> Set to LIVE. cells2[m][n]->setType(LIVE); } } // Now we've gone through all of cells, and saved the new values in cells2. // Now we loop through cells and set all the cells' types to those of cells2. for (unsigned int f = 0; f < cells.size(); f++) // Loop through cells' rows. { for (unsigned int g = 0; g < cells.at(f).size(); g++) // Loop through cells columns. { cells[f][g]->setType(cells2[f][g]->getType()); // Set cells[f][g]'s type to cells2[f][g]'s type. } } } stack.h - Here's my stack. #ifndef STACK_H_ #define STACK_H_ #include <iostream> #include "node.h" template <typename T> class Stack { private: Node<T>* top; int listSize; public: Stack(); int size() const; bool empty() const; void push(const T& value); void pop(); T& peek() const; }; template <typename T> Stack<T>::Stack() : top(NULL) { listSize = 0; } template <typename T> int Stack<T>::size() const { return listSize; } template <typename T> bool Stack<T>::empty() const { if(listSize == 0) return true; else return false; } template <typename T> void Stack<T>::push(const T& value) { Node<T>* newOne = new Node<T>(value); newOne->next = top; top = newOne; listSize++; } template <typename T> void Stack<T>::pop() { Node<T>* oldT = top; top = top->next; delete oldT; listSize--; } template <typename T> T& Stack<T>::peek() const { return top->data; // Returns data in top item. } #endif gridcell.cpp - Gridcell implementation #include <iostream> #include "gridcell.h" using namespace std; // Constructor: Creates a grid cell. GridCell::GridCell(QWidget *parent) : QFrame(parent) { this->type = DEAD; // Default: Cell is DEAD (white). setFrameStyle(QFrame::Box); // Set the frame style. This is what gives each box its black border. this->button = new QPushButton(this); //Creates button that fills entirety of each grid cell. this->button->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding); // Expands button to fill space. this->button->setMinimumSize(19,19); //width,height // Min height and width of button. QHBoxLayout *layout = new QHBoxLayout(); //Creates a simple layout to hold our button and add the button to it. layout->addWidget(this->button); setLayout(layout); layout->setStretchFactor(this->button,1); // Lets the buttons expand all the way to the edges of the current frame with no space leftover layout->setContentsMargins(0,0,0,0); layout->setSpacing(0); connect(this->button,SIGNAL(clicked()),this,SLOT(handleClick())); // Connects clicked signal with handleClick slot. redrawCell(); // Calls function to redraw (set new type for) the cell. } // Basic destructor. GridCell::~GridCell() { delete this->button; } // Accessor for the cell type. CellType GridCell::getType() const { return(this->type); } // Mutator for the cell type. Also has the side effect of causing the cell to be redrawn on the GUI. void GridCell::setType(CellType type) { this->type = type; redrawCell(); // Sets type and redraws cell. } // Handler slot for button clicks. This method is called whenever the user clicks on this cell in the grid. void GridCell::handleClick() { // When clicked on... if(this->type == DEAD) // If type is DEAD (white), change to LIVE (black). type = LIVE; else type = DEAD; // If type is LIVE (black), change to DEAD (white). setType(type); // Sets new type (color). setType Calls redrawCell() to recolor. } // Method to check cell type and return the color of that type. Qt::GlobalColor GridCell::getColorForCellType() { switch(this->type) { default: case DEAD: return Qt::white; case LIVE: return Qt::black; } } // Helper method. Forces current cell to be redrawn on the GUI. Called whenever the setType method is invoked. void GridCell::redrawCell() { Qt::GlobalColor gc = getColorForCellType(); //Find out what color this cell should be. this->button->setPalette(QPalette(gc,gc)); //Force the button in the cell to be the proper color. this->button->setAutoFillBackground(true); this->button->setFlat(true); //Force QT to NOT draw the borders on the button } Thanks a lot. Let me know if you need anything else.

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• .NET: Interface Problem VB.net Getter Only Interface

  - by snmcdonald

  Why does an interface override a class definition and violate class encapsulation? I have included two samples below, one in C# and one in VB.net? VB.net Module Module1 Sub Main() Dim testInterface As ITest = New TestMe Console.WriteLine(testInterface.Testable) ''// Prints False testInterface.Testable = True ''// Access to Private!!! Console.WriteLine(testInterface.Testable) ''// Prints True Dim testClass As TestMe = New TestMe Console.WriteLine(testClass.Testable) ''// Prints False ''//testClass.Testable = True ''// Compile Error Console.WriteLine(testClass.Testable) ''// Prints False End Sub End Module Public Class TestMe : Implements ITest Private m_testable As Boolean = False Public Property Testable As Boolean Implements ITest.Testable Get Return m_testable End Get Private Set(ByVal value As Boolean) m_testable = value End Set End Property End Class Interface ITest Property Testable As Boolean End Interface C# using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace InterfaceCSTest { class Program { static void Main(string[] args) { ITest testInterface = new TestMe(); Console.WriteLine(testInterface.Testable); testInterface.Testable = true; Console.WriteLine(testInterface.Testable); TestMe testClass = new TestMe(); Console.WriteLine(testClass.Testable); //testClass.Testable = true; Console.WriteLine(testClass.Testable); } } class TestMe : ITest { private bool m_testable = false; public bool Testable { get { return m_testable; } private set { m_testable = value; } } } interface ITest { bool Testable { get; set; } } } More Specifically How do I implement a interface in VB.net that will allow for a private setter. For example in C# I can declare: class TestMe : ITest { private bool m_testable = false; public bool Testable { get { return m_testable; } private set //No Compile Error here! { m_testable = value; } } } interface ITest { bool Testable { get; } } However, if I declare an interface property as readonly in VB.net I cannot create a setter. If I create a VB.net interface as just a plain old property then interface declarations will violate my encapsulation. Public Class TestMe : Implements ITest Private m_testable As Boolean = False Public ReadOnly Property Testable As Boolean Implements ITest.Testable Get Return m_testable End Get Private Set(ByVal value As Boolean) ''//Compile Error m_testable = value End Set End Property End Class Interface ITest ReadOnly Property Testable As Boolean End Interface So my question is, how do I define a getter only Interface in VB.net with proper encapsulation? I figured the first example would have been the best method. However, it appears as if interface definitions overrule class definitions. So I tried to create a getter only (Readonly) property like in C# but it does not work for VB.net. Maybe this is just a limitation of the language?

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• ASP.NET - working with GridView Programmatically

  - by JMSA

  I am continuing from this post. After much Googling, I have come up with this code to edit cells programmatically: using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using Ice_Web_Portal.BO; namespace GridView___Test { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { GridView1.DataSource = Course.GetCourses(); GridView1.DataBind(); } protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e) { GridViewRow row = GridView1.Rows[e.NewEditIndex]; GridView1.EditIndex = e.NewEditIndex; GridView1.DataSource = Course.GetCourses(); GridView1.DataBind(); } protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e) { TextBox txtID = (TextBox)GridView1.Rows[e.RowIndex].Cells[1].Controls[0]; TextBox txtCourseCode = (TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0]; TextBox txtCourseName = (TextBox)GridView1.Rows[e.RowIndex].Cells[3].Controls[0]; TextBox txtCourseTextBookCode = (TextBox)GridView1.Rows[e.RowIndex].Cells[4].Controls[0]; Course item = new Course(); item.ID = Convert.ToInt32(txtID.Text); item.CourseCode = txtCourseCode.Text; item.CourseName = txtCourseName.Text; item.TextBookCode = txtCourseTextBookCode.Text; bool success = Course.Update(item); labMessage.Text = success.ToString(); GridView1.EditIndex = -1; GridView1.DataSource = Course.GetCourses(); GridView1.DataBind(); } } } But 2 problems are happening. (1) I need to press command buttons twice to Edit/Update. (2) Changes in the cell values are not updated in the database. I.e. edited cell values are not committing. Can anyone give me a solution?

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• Saxon XSLT-Transformation: How to change serialization of an empty tag from <x/> to <x></x>?

  - by Ben

  Hello folks! I do some XSLT-Transformation using Saxon HE 9.2 with the output later being unmarshalled by Castor 1.3.1. The whole thing runs with Java at the JDK 6. My XSLT-Transformation looks like this: <xsl:transform version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:ns="http://my/own/custom/namespace/for/the/target/document"> <xsl:output method="xml" encoding="UTF-8" indent="no" /> <xsl:template match="/"> <ns:item> <ns:property name="id"> <xsl:value-of select="/some/complicated/xpath" /> </ns:property> <!-- ... more ... --> </xsl:template> So the thing is: if the XPath-expression /some/complicated/xpath evaluates to an empty sequence, the Saxon serializer writes <ns:property/> instead of <ns:property></ns:property>. This, however, confuses the Castor unmarshaller, which is next in the pipeline and which unmarshals the output of the transformation to instances of XSD-generated Java-code. So my question is: How can I tell the Saxon-serializer to output empty tags not as standalone tags? Here is what I am proximately currently doing to execute the transformation: import net.sf.saxon.s9api.*; import javax.xml.transform.*; import javax.xml.transform.sax.SAXSource; // ... // read data XMLReader xmlReader = XMLReaderFactory.createXMLReader(); // ... there is some more setting up the xmlReader here ... InputStream xsltStream = new FileInputStream(xsltFile); InputStream inputStream = new FileInputStream(inputFile); Source xsltSource = new SAXSource(xmlReader, new InputSource(xsltStream)); Source inputSource = new SAXSource(xmlReader, new InputSource(inputStream)); XdmNode input = processor.newDocumentBuilder().build(inputSource); // initialize transformation configuration Processor processor = new Processor(false); XsltCompiler compiler = processor.newXsltCompiler(); compiler.setErrorListener(this); XsltExecutable executable = compiler.compile(xsltSource); Serializer serializer = new Serializer(); serializer.setOutputProperty(Serializer.Property.METHOD, "xml"); serializer.setOutputProperty(Serializer.Property.INDENT, "no"); serializer.setOutputStream(output); // execute transformation XsltTransformer transformer = executable.load(); transformer.setInitialContextNode(input); transformer.setErrorListener(this); transformer.setDestination(serializer); transformer.setSchemaValidationMode(ValidationMode.STRIP); transformer.transform(); I'd appreciate any hint pointing in the direction of a solution. :-) In case of any unclarity I'd be happy to give more details. Nightly greetings from Germany, Benjamin

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• WP7 silverlight custom control using popup

  - by Miloud B.

  Hi guys, I'm creating a custom datepicker, I have a textbox, once clicked it opens a calendar within a popup. What I want to do is change the size of the popup so it shows my whole calendar, but I can't manage to change it..., I've tried using Height, Width, MinHeight, MinWidth... but it doesn't work, the popup keep showing with a fixed size. The thing is that my popup's parent property isn't evaluated since it has expression issues (according to debugger), so I'm sure my popup's parent isn't the main screen( say layout grid). How can I for example make my popup open within a specific context ? This part of my code isn't XAML, it's C# code only and it looks like: using System; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Ink; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.Windows.Controls.Primitives; namespace CalendarBranch.components { public class wpDatePicker:TextBox { private CalendarPopup calendar; private Popup popup; public wpDatePicker() { this.calendar = new CalendarPopup(); this.popup = new Popup(); this.popup.Child = this.calendar; this.popup.Margin = new Thickness(0); this.MouseLeftButtonUp += new MouseButtonEventHandler(wpDatePicker_MouseLeftButtonUp); this.calendar.onDateSelect += new EventHandler(onDateSelected); this.IsReadOnly = true; } protected void wpDatePicker_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { this.popup.Height = this.calendar.Height; this.popup.Width = this.calendar.Width; this.popup.HorizontalAlignment = HorizontalAlignment.Center; this.popup.VerticalAlignment = VerticalAlignment.Center; this.popup.HorizontalOffset = 0; this.popup.VerticalOffset = 0; this.popup.MinHeight = this.calendar.Height; this.popup.MinWidth = this.calendar.Width; this.popup.IsOpen = true; } private void onDateSelected(Object sender, EventArgs ea) { this.Text = this.calendar.SelectedValue.ToShortDateString(); this.popup.IsOpen = false; } } } PS: the class Calendar is simply a UserControl that contains a grid with multiple columns, HyperLinkButtons and TextBlocks, so nothing special. Thank you in advance guys ;) Cheers Miloud B.

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• How to call base abstract or interface from DAL into BLL?

  - by programmerist

  How can i access abstract class in BLL ? i shouldn't see GenAccessor in BLL it must be private class GenAccessor . i should access Save method over _AccessorForSQL. ok? MY BLL cs: public class AccessorForSQL: GenoTip.DAL._AccessorForSQL { public bool Save(string Name, string SurName, string Adress) { ListDictionary ld = new ListDictionary(); ld.Add("@Name", Name); ld.Add("@SurName", SurName); ld.Add("@Adress", Adress); return **base.Save("sp_InsertCustomers", ld, CommandType.StoredProcedure);** } } i can not access base.Save....???????? it is my DAL Layer: namespace GenoTip.DAL { public abstract class _AccessorForSQL { public abstract bool Save(string sp, ListDictionary ld, CommandType cmdType); public abstract bool Update(); public abstract bool Delete(); public abstract DataSet Select(); } private class GenAccessor : _AccessorForSQL { DataSet ds; DataTable dt; public override bool Save(string sp, ListDictionary ld, CommandType cmdType) { SqlConnection con = null; SqlCommand cmd = null; SqlDataReader dr = null; try { con = GetConnection(); cmd = new SqlCommand(sp, con); con.Open(); cmd.CommandType = cmdType; foreach (string ky in ld.Keys) { cmd.Parameters.AddWithValue(ky, ld[ky]); } dr = cmd.ExecuteReader(); ds = new DataSet(); dt = new DataTable(); ds.Tables.Add(dt); ds.Load(dr, LoadOption.OverwriteChanges, dt); } catch (Exception exp) { HttpContext.Current.Trace.Warn("Error in GetCustomerByID()", exp.Message, exp); } finally { if (dr != null) dr.Close(); if (con != null) con.Close(); } return (ds.Tables[0].Rows.Count 0) ? true : false; } public override bool Update() { return true; } public override bool Delete() { return true; } public override DataSet Select() { DataSet dst = new DataSet(); return dst; } private static SqlConnection GetConnection() { string connStr = WebConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; SqlConnection conn = new SqlConnection(connStr); return conn; }

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• Problem with std::map and std::pair

  - by Tom

  Hi everyone. I have a small program I want to execute to test something #include <map> #include <iostream> using namespace std; struct _pos{ float xi; float xf; bool operator<(_pos& other){ return this->xi < other.xi; } }; struct _val{ float f; }; int main() { map<_pos,_val> m; struct _pos k1 = {0,10}; struct _pos k2 = {10,15}; struct _val v1 = {5.5}; struct _val v2 = {12.3}; m.insert(std::pair<_pos,_val>(k1,v1)); m.insert(std::pair<_pos,_val>(k2,v2)); return 0; } The problem is that when I try to compile it, I get the following error $ g++ m2.cpp -o mtest In file included from /usr/include/c++/4.4/bits/stl_tree.h:64, from /usr/include/c++/4.4/map:60, from m2.cpp:1: /usr/include/c++/4.4/bits/stl_function.h: In member function ‘bool std::less<_Tp>::operator()(const _Tp&, const _Tp&) const [with _Tp = _pos]’: /usr/include/c++/4.4/bits/stl_tree.h:1170: instantiated from ‘std::pair<typename std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(const _Val&) [with _Key = _pos, _Val = std::pair<const _pos, _val>, _KeyOfValue = std::_Select1st<std::pair<const _pos, _val> >, _Compare = std::less<_pos>, _Alloc = std::allocator<std::pair<const _pos, _val> >]’ /usr/include/c++/4.4/bits/stl_map.h:500: instantiated from ‘std::pair<typename std::_Rb_tree<_Key, std::pair<const _Key, _Tp>, std::_Select1st<std::pair<const _Key, _Tp> >, _Compare, typename _Alloc::rebind<std::pair<const _Key, _Tp> >::other>::iterator, bool> std::map<_Key, _Tp, _Compare, _Alloc>::insert(const std::pair<const _Key, _Tp>&) [with _Key = _pos, _Tp = _val, _Compare = std::less<_pos>, _Alloc = std::allocator<std::pair<const _pos, _val> >]’ m2.cpp:30: instantiated from here /usr/include/c++/4.4/bits/stl_function.h:230: error: no match for ‘operator<’ in ‘__x < __y’ m2.cpp:9: note: candidates are: bool _pos::operator<(_pos&) $ I thought that declaring the operator< on the key would solve the problem, but its still there. What could be wrong? Thanks in advance.

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• M-V-VM, isn't the Model leaking into the View?

  - by BFree

  The point of M-V-VM as we all know is about speraration of concerns. In patterns like MVVM, MVC or MVP, the main purpose is to decouple the View from the Data thereby building more flexible components. I'll demonstrate first a very common scenario found in many WPF apps, and then I'll make my point: Say we have some StockQuote application that streams a bunch of quotes and displays them on screen. Typically, you'd have this: StockQuote.cs : (Model) public class StockQuote { public string Symbol { get; set; } public double Price { get; set; } } StockQuoteViewModel.cs : (ViewModel) public class StockQuoteViewModel { private ObservableCollection<StockQuote> _quotes = new ObservableCollection<StockQuote>(); public ObservableCollection<StockQuote> Quotes { get { return _quotes; } } } StockQuoteView.xaml (View) <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WpfApplication1" Title="Window1" Height="300" Width="300"> <Window.DataContext> <local:StockQuoteViewModel/> </Window.DataContext> <Window.Resources> <DataTemplate x:Key="listBoxDateTemplate"> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding Symbol}"/> <TextBlock Text="{Binding Price}"/> </StackPanel> </DataTemplate> </Window.Resources> <Grid> <ListBox ItemTemplate="{StaticResource listBoxDateTemplate}" ItemsSource="{Binding Quotes}"/> </Grid> </Window> And then you'd have some kind of service that would feed the ObservableCollection with new StockQuotes. My question is this: In this type of scenario, the StockQuote is considered the Model, and we're exposing that to the View through the ViewModel's ObservableCollection. Which basically means, our View has knowledge of the Model. Doesn't that violate the whole paradigm of M-V-VM? Or am I missing something here....?

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• Routed Command Question

  - by Andrew

  I'd like to implement a custom command to capture a Backspace key gesture inside of a textbox, but I don't know how. I wrote a test program in order to understand what's going on, but the behaviour of the program is rather confusing. Basically, I just need to be able to handle the Backspace key gesture via wpf commands while keyboard focus is in the textbox, and without disrupting the normal behaviour of the Backspace key within the textbox. Here's the xaml for the main window and the corresponding code-behind, too (note that I created a second command for the Enter key, just to compare its behaviour to that of the Backspace key): <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <Grid> <TextBox Margin="44,54,44,128" Name="textBox1" /> </Grid> </Window> And here's the corresponding code-behind: using System.Windows; using System.Windows.Input; namespace WpfApplication1 { /// <summary> /// Interaction logic for EntryListView.xaml /// </summary> public partial class Window1 : Window { public static RoutedCommand EnterCommand = new RoutedCommand(); public static RoutedCommand BackspaceCommand = new RoutedCommand(); public Window1() { InitializeComponent(); CommandBinding cb1 = new CommandBinding(EnterCommand, EnterExecuted, EnterCanExecute); CommandBinding cb2 = new CommandBinding(BackspaceCommand, BackspaceExecuted, BackspaceCanExecute); this.CommandBindings.Add(cb1); this.CommandBindings.Add(cb2); KeyGesture kg1 = new KeyGesture(Key.Enter); KeyGesture kg2 = new KeyGesture(Key.Back); InputBinding ib1 = new InputBinding(EnterCommand, kg1); InputBinding ib2 = new InputBinding(BackspaceCommand, kg2); this.InputBindings.Add(ib1); this.InputBindings.Add(ib2); } #region Command Handlers private void EnterCanExecute(object sender, CanExecuteRoutedEventArgs e) { MessageBox.Show("Inside EnterCanExecute Method."); e.CanExecute = true; } private void EnterExecuted(object sender, ExecutedRoutedEventArgs e) { MessageBox.Show("Inside EnterExecuted Method."); e.Handled = true; } private void BackspaceCanExecute(object sender, CanExecuteRoutedEventArgs e) { MessageBox.Show("Inside BackspaceCanExecute Method."); e.Handled = true; } private void BackspaceExecuted(object sender, ExecutedRoutedEventArgs e) { MessageBox.Show("Inside BackspaceExecuted Method."); e.Handled = true; } #endregion Command Handlers } } Any help would be very much appreciated. Thanks! Andrew

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• Can't make my WCF extension work

  - by Sergio Romero

  I have a WCF solution that consists of the following class libraries: Exercise.Services: Contains the implementation classes for the services. Exercise.ServiceProxy: Contains the classes that are instantiated in the client. Exercise.HttpHost: Contains the services (*.svc files). I'm calling the service from a console application and the "first version" works really well so I took the next step which is to create a custom ServiceHostFactory, ServiceHost, and InstanceProvider so I can use constructor injection in my services as it is explained in this article. These classes are implemented in yet another class library: 4. Exercise.StructureMapWcfExtension Now even though I've modified my service this: <%@ ServiceHost Language="C#" Debug="true" Factory="Exercise.StructureMapWcfExtension.StructureMapServiceHostFactory" Service="Exercise.Services.PurchaseOrderService" %> I always get the following exception: System.ServiceModel.CommunicationException Security negotiation failed because the remote party did not send back a reply in a timely manner. This may be because the underlying transport connection was aborted. It fails in this line of code: public class PurchaseOrderProxy : ClientBase<IPurchaseOrderService>, IPurchaseOrderService { public PurchaseOrderResponse CreatePurchaseOrder(PurchaseOrderRequest purchaseOrderRequest) { return base.Channel.CreatePurchaseOrder(purchaseOrderRequest); //Fails here } } But that is not all, I added a trace to the web.config file and this is the error that appears in the log file: System.InvalidOperationException The service type provided could not be loaded as a service because it does not have a default (parameter-less) constructor. To fix the problem, add a default constructor to the type, or pass an instance of the type to the host. So this means that my ServiceHostFactory is never being hit, I even set a breakpoint in both its constructor and its method and they never get hit. I've added a reference of the StructureMapWcfExtension library to all the other ones (even the console client), one by one to no avail. I also tried to use the option in the host's web.config file to configure the factory like so: <serviceHostingEnvironment> <serviceActivations> <add service="Exercise.Services.PurchaseOrderService" relativeAddress="PurchaseOrderService.svc" factory="Exercise.StructureMapWcfExtension.StructureMapServiceHostFactory"/> </serviceActivations> </serviceHostingEnvironment> That didn't work either. Please I need help in getting this to work so I can incorporate it to our project. Thank you. UPDATE: Here's the service host factory's code: namespace Exercise.StructureMapWcfExtension { public class StructureMapServiceHostFactory : ServiceHostFactory { private readonly Container Container; public StructureMapServiceHostFactory() { Container = new Container(); new ContainerConfigurer().Configure(Container); } protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses) { return new StructureMapServiceHost(Container, serviceType, baseAddresses); } } public class ContainerConfigurer { public void Configure(Container container) { container.Configure(r => r.For<IPurchaseOrderFacade>().Use<PurchaseOrderFacade>()); } } }

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• pointers to functions

  - by DevAno1

  I have two basic Cpp tasks, but still I have problems with them. First is to write functions mul1,div1,sub1,sum1, taking ints as arguments and returning ints. Then I need to create pointers ptrFun1 and ptrFun2 to functions mul1 and sum1, and print results of using them. Problem starts with defining those pointers. I thought I was doing it right, but devcpp gives me errors in compilation. #include <iostream> using namespace std; int mul1(int a,int b) { return a * b; } int div1(int a,int b) { return a / b; } int sum1(int a,int b) { return a + b; } int sub1(int a,int b) { return a - b; } int main() { int a=1; int b=5; cout << mul1(a,b) << endl; cout << div1(a,b) << endl; cout << sum1(a,b) << endl; cout << sub1(a,b) << endl; int *funPtr1(int, int); int *funPtr2(int, int); funPtr1 = sum1; funPtr2 = mul1; cout << funPtr1(a,b) << endl; cout << funPtr2(a,b) << endl; system("PAUSE"); return 0; } 38 assignment of function int* funPtr1(int, int)' 38 cannot convertint ()(int, int)' to `int*()(int, int)' in assignment Task 2 is to create array of pointers to those functions named tabFunPtr. How to do that ?

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• I am using a constructor for my array but why is it saying i need a return type?

  - by JB

  using System; using System.IO; using System.Data; using System.Text; using System.Drawing; using System.Data.OleDb; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Drawing.Printing; using System.Collections.Generic; namespace Eagle_Eye_Class_Finder { public class GetSchedule { public class IDnumber { public string Name { get; set; } public string ID { get; set; } public string year { get; set; } public string class1 { get; set; } public string class2 { get; set; } public string class3 { get; set; } public string class4 { get; set; } IDnumber[] IDnumbers = new IDnumber[3]; public GetSchedule() //here i get an error saying method must have a return type??? { IDnumbers[0] = new IDnumber() { Name = "Joshua Banks",ID = "900456317", year = "Senior", class1 = "TEET 4090", class2 = "TEET 3020", class3 = "TEET 3090", class4 = "TEET 4290" }; IDnumbers[1] = new IDnumber() { Name = "Sean Ward", ID = "900456318", year = "Junior", class1 = "ENGNR 4090", class2 = "ENGNR 3020", class3 = "ENGNR 3090", class4 = "ENGNR 4290" }; IDnumbers[2] = new IDnumber() { Name = "Terrell Johnson",ID = "900456319",year = "Sophomore", class1 = "BUS 4090", class2 = "BUS 3020", class3 = "BUS 3090", class4 = "BUS 4290" }; } static void ProcessNumber(IDnumber myNum) { StringBuilder myData = new StringBuilder(); myData.AppendLine(IDnumber.Name); myData.AppendLine(": "); myData.AppendLine(IDnumber.ID); myData.AppendLine(IDnumber.year); myData.AppendLine(IDnumber.class1); myData.AppendLine(IDnumber.class2); myData.AppendLine(IDnumber.class3); myData.AppendLine(IDnumber.class4); MessageBox.Show(myData); } public string GetDataFromNumber(string ID) { foreach (IDnumber idCandidateMatch in IDnumbers) { if (IDCandidateMatch.ID == ID) { StringBuilder myData = new StringBuilder(); myData.AppendLine(IDnumber.Name); myData.AppendLine(": "); myData.AppendLine(IDnumber.ID); myData.AppendLine(IDnumber.year); myData.AppendLine(IDnumber.class1); myData.AppendLine(IDnumber.class2); myData.AppendLine(IDnumber.class3); myData.AppendLine(IDnumber.class4); return myData; } } return ""; } } } }

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• Pylucene in Python 2.6 + MacOs Snow Leopard

  - by jbastos

  Greetings, I'm trying to install Pylucene on my 32-bit python running on Snow Leopard. I compiled JCC with success. But I get warnings while making pylucene: ld: warning: in build/temp.macosx-10.6-i386-2.6/build/_lucene/__init__.o, file is not of required architecture ld: warning: in build/temp.macosx-10.6-i386-2.6/build/_lucene/__wrap01__.o, file is not of required architecture ld: warning: in build/temp.macosx-10.6-i386-2.6/build/_lucene/__wrap02__.o, file is not of required architecture ld: warning: in build/temp.macosx-10.6-i386-2.6/build/_lucene/__wrap03__.o, file is not of required architecture ld: warning: in build/temp.macosx-10.6-i386-2.6/build/_lucene/functions.o, file is not of required architecture ld: warning: in build/temp.macosx-10.6-i386-2.6/build/_lucene/JArray.o, file is not of required architecture ld: warning: in build/temp.macosx-10.6-i386-2.6/build/_lucene/JObject.o, file is not of required architecture ld: warning: in build/temp.macosx-10.6-i386-2.6/build/_lucene/lucene.o, file is not of required architecture ld: warning: in build/temp.macosx-10.6-i386-2.6/build/_lucene/types.o, file is not of required architecture ld: warning: in /Developer/SDKs/MacOSX10.4u.sdk/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/JCC-2.3-py2.6-macosx-10.3-fat.egg/libjcc.dylib, file is not of required architecture ld: warning: in /Developer/SDKs/MacOSX10.4u.sdk/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/JCC-2.3-py2.6-macosx-10.3-fat.egg/libjcc.dylib, file is not of required architecture build of complete Then I try to import lucene: MacBookPro:~/tmp/trunk python Python 2.6.3 (r263:75184, Oct 2 2009, 07:56:03) [GCC 4.0.1 (Apple Inc. build 5493)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import pylucene Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named pylucene >>> import lucene Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/lucene-2.9.0-py2.6-macosx-10.6-i386.egg/lucene/__init__.py", line 7, in <module> import _lucene ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/lucene-2.9.0-py2.6-macosx-10.6-i386.egg/lucene/_lucene.so, 2): Symbol not found: __Z8getVMEnvP7_object Referenced from: /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/lucene-2.9.0-py2.6-macosx-10.6-i386.egg/lucene/_lucene.so Expected in: flat namespace in /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/lucene-2.9.0-py2.6-macosx-10.6-i386.egg/lucene/_lucene.so >>> Any hints?

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• .NET WinForms INotifyPropertyChanged updates all bindings when one is changed. Better way?

  - by Dave Welling

  In a windows forms application, a property change that triggers INotifyPropertyChanged, will result in the form reading EVERY property from my bound object, not just the property changed. (See example code below) This seems absurdly wasteful since the interface requires the name of the changing property. It is causing a lot of clocking in my app because some of the property getters require calculations to be performed. I'll likely need to implement some sort of logic in my getters to discard the unnecessary reads if there is no better way to do this. Am I missing something? Is there a better way? Don't say to use a different presentation technology please -- I am doing this on Windows Mobile (although the behavior happens on the full framework as well). Here's some toy code to demonstrate the problem. Clicking the button will result in BOTH textboxes being populated even though one property has changed. using System; using System.ComponentModel; using System.Drawing; using System.Windows.Forms; namespace Example { public class ExView : Form { private Presenter _presenter = new Presenter(); public ExView() { this.MinimizeBox = false; TextBox txt1 = new TextBox(); txt1.Parent = this; txt1.Location = new Point(1, 1); txt1.Width = this.ClientSize.Width - 10; txt1.DataBindings.Add("Text", _presenter, "SomeText1"); TextBox txt2 = new TextBox(); txt2.Parent = this; txt2.Location = new Point(1, 40); txt2.Width = this.ClientSize.Width - 10; txt2.DataBindings.Add("Text", _presenter, "SomeText2"); Button but = new Button(); but.Parent = this; but.Location = new Point(1, 80); but.Click +=new EventHandler(but_Click); } void but_Click(object sender, EventArgs e) { _presenter.SomeText1 = "some text 1"; } } public class Presenter : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private string _SomeText1 = string.Empty; public string SomeText1 { get { return _SomeText1; } set { _SomeText1 = value; _SomeText2 = value; // <-- To demonstrate that both properties are read OnPropertyChanged("SomeText1"); } } private string _SomeText2 = string.Empty; public string SomeText2 { get { return _SomeText2; } set { _SomeText2 = value; OnPropertyChanged("SomeText2"); } } private void OnPropertyChanged(string PropertyName) { PropertyChangedEventHandler temp = PropertyChanged; if (temp != null) { temp(this, new PropertyChangedEventArgs(PropertyName)); } } } }

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• java.sql.SQLWarning: [Microsoft][SQLServer 2000 Driver for JDBC]Database changed to X

  - by adisembiring

  Hi all, I'm using Hibernate 3.2.1 and database SQLServer2000 while I'm try to insert some data using my dao, some warning occurred like this: java.sql.SQLWarning: [Microsoft][SQLServer 2000 Driver for JDBC]Database changed to BTN_SPP_DB at com.microsoft.jdbc.base.BaseWarnings.createSQLWarning(Unknown Source) at com.microsoft.jdbc.base.BaseWarnings.get(Unknown Source) at com.microsoft.jdbc.base.BaseConnection.getWarnings(Unknown Source) at org.hibernate.util.JDBCExceptionReporter.logAndClearWarnings(JDBCExceptionReporter.java:22) at org.hibernate.jdbc.ConnectionManager.closeConnection(ConnectionManager.java:443) at org.hibernate.jdbc.ConnectionManager.aggressiveRelease(ConnectionManager.java:400) at org.hibernate.jdbc.ConnectionManager.afterTransaction(ConnectionManager.java:287) at org.hibernate.jdbc.JDBCContext.afterTransactionCompletion(JDBCContext.java:221) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:119) at co.id.hanoman.btnmw.spp.dao.TagihanDao.save(TagihanDao.java:43) at co.id.hanoman.btnmw.spp.dao.TagihanDao.save(TagihanDao.java:1) at co.id.hanoman.btnmw.spp.dao.test.TagihanDaoTest.testSave(TagihanDaoTest.java:81) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99) at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81) at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75) at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45) at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66) at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35) at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42) at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196) my hibernate initialization log is: 2010-04-26 22:54:05,203 INFO [Version] Hibernate Annotations 3.3.0.GA 2010-04-26 22:54:05,234 INFO [Environment] Hibernate 3.2.1 2010-04-26 22:54:05,234 INFO [Environment] hibernate.properties not found 2010-04-26 22:54:05,234 INFO [Environment] Bytecode provider name : cglib 2010-04-26 22:54:05,234 INFO [Environment] using JDK 1.4 java.sql.Timestamp handling 2010-04-26 22:54:05,343 INFO [Configuration] configuring from resource: /hibernate.cfg.xml 2010-04-26 22:54:05,343 INFO [Configuration] Configuration resource: /hibernate.cfg.xml 2010-04-26 22:54:05,406 DEBUG [DTDEntityResolver] trying to resolve system-id [http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd] 2010-04-26 22:54:05,406 DEBUG [DTDEntityResolver] recognized hibernate namespace; attempting to resolve on classpath under org/hibernate/ 2010-04-26 22:54:05,406 DEBUG [DTDEntityResolver] located [http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd] in classpath 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.dialect=org.hibernate.dialect.SQLServerDialect 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.connection.driver_class=com.microsoft.jdbc.sqlserver.SQLServerDriver 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.connection.url=jdbc:microsoft:sqlserver://12.56.11.65:1433;databaseName=BTN_SPP_DB 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.connection.username=spp 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.connection.password=spp

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• Why does this C# event handler not respond to this event in this Silverlight application?

  - by Edward Tanguay

  Can anyone tell me why the following code successfully executes this event: OnLoadingComplete(this, null); but never executes this event handler? void initialDataLoader_OnLoadingComplete(object obj, DataLoaderArgs args) CODE: using System; using System.Collections.Generic; using System.Linq; using System.Windows.Controls; using System.Diagnostics; namespace TestEvent22928 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); DataLoader initialDataLoader = new DataLoader("initial"); initialDataLoader.RegisterText("test1", "http://test:111/testdata/test1.txt"); initialDataLoader.RegisterText("test2", "http://test:111/testdata/test2.txt"); initialDataLoader.BeginLoading(); initialDataLoader.OnLoadingComplete += new DataLoader.LoadingComplete(initialDataLoader_OnLoadingComplete); } void initialDataLoader_OnLoadingComplete(object obj, DataLoaderArgs args) { Debug.WriteLine("loading complete"); //WHY DOES EXECUTION NEVER GET HERE? } } public class DataManager { public DataLoader CreateDataloader(string dataloaderIdCode) { DataLoader dataLoader = new DataLoader(dataloaderIdCode); return dataLoader; } } public class DataLoader { public string IdCode { get; set; } public List<DataItem> DataItems { get; set; } public delegate void LoadingComplete(object obj, DataLoaderArgs args); public event LoadingComplete OnLoadingComplete = delegate { }; private int dataItemCurrentlyLoadingIndex; public DataLoader(string idCode) { IdCode = idCode; DataItems = new List<DataItem>(); dataItemCurrentlyLoadingIndex = -1; } public void RegisterText(string idCode, string absoluteSourceUrl) { DataItem dataItem = new DataItem { IdCode = idCode, AbsoluteSourceUrl = absoluteSourceUrl, Kind = DataItemKind.Text }; DataItems.Add(dataItem); } public void BeginLoading() { LoadNext(); } private void LoadNext() { dataItemCurrentlyLoadingIndex++; if (dataItemCurrentlyLoadingIndex < DataItems.Count()) { DataItem dataItem = DataItems[dataItemCurrentlyLoadingIndex]; Debug.WriteLine("loading " + dataItem.IdCode + "..."); LoadNext(); } else { OnLoadingComplete(this, null); //EXECUTION GETS HERE } } } public class DataItem { public string IdCode { get; set; } public string AbsoluteSourceUrl { get; set; } public DataItemKind Kind { get; set; } public object DataObject { get; set; } } public enum DataItemKind { Text, Image } public class DataLoaderArgs : EventArgs { public string Message { get; set; } public DataItem DataItem { get; set; } public DataLoaderArgs(string message, DataItem dataItem) { Message = message; DataItem = dataItem; } } }

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• Written a resharper plugin that modifies the TextControl?

  - by Ajaxx

  Resharper claims to eat it's own dogfood, specifically, they claim that many of the features of Resharper are written ontop of R# (OpenAPI). I'm writing a simple plugin to fix up comments of the current document of a selection. When this plugin is run, it throws an exception as follows: Document can be modified inside a command scope only I've researched the error and can't find anything to help with this, so I'm hoping that possibly, you've written a plugin to accomplish this. If not, I hope the snippet is enough to help others get their own plugins underway. using System; using System.IO; using System.Windows.Forms; using JetBrains.ActionManagement; using JetBrains.DocumentModel; using JetBrains.IDE; using JetBrains.TextControl; using JetBrains.Util; namespace TinkerToys.Actions { [ActionHandler("TinkerToys.RewriteComment")] public class RewriteCommentAction : IActionHandler { #region Implementation of IActionHandler /// <summary> /// Updates action visual presentation. If presentation.Enabled is set to false, Execute /// will not be called. /// </summary> /// <param name="context">DataContext</param> /// <param name="presentation">presentation to update</param> /// <param name="nextUpdate">delegate to call</param> public bool Update(IDataContext context, ActionPresentation presentation, DelegateUpdate nextUpdate) { ITextControl textControl = context.GetData(DataConstants.TEXT_CONTROL); return textControl != null; } /// <summary> /// Executes action. Called after Update, that set ActionPresentation.Enabled to true. /// </summary> /// <param name="context">DataContext</param> /// <param name="nextExecute">delegate to call</param> public void Execute(IDataContext context, DelegateExecute nextExecute) { ITextControl textControl = context.GetData(DataConstants.TEXT_CONTROL); if (textControl != null) { TextRange textSelectRange; ISelectionModel textSelectionModel = textControl.SelectionModel; if ((textSelectionModel != null) && textSelectionModel.HasSelection()) { textSelectRange = textSelectionModel.Range; } else { textSelectRange = new TextRange(0, textControl.Document.GetTextLength()); } IDocument textDocument = textControl.Document; String textSelection = textDocument.GetText(textSelectRange); if (textSelection != null) { StringReader sReader = new StringReader(textSelection); StringWriter sWriter = new StringWriter(); Converter.Convert(sReader, sWriter); textSelection = sWriter.ToString(); textDocument.ReplaceText(textSelectRange, textSelection); } } } #endregion } } So what is this command scope it wants so badly? I had some additional logging in this prior to posting it so I'm absolutely certain that both the range and text are valid. In addition, the error seems to indicate that I'm missing some scope that I've been, as yet, unable to find.

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• DatagridView loses current edit on Background update

  - by yoni.s

  Here's my problem : I have a DataGridView bound to a BindingList of custom objects. A background thread is constantly updating a value of these objects. The udpates are showing correctly, and everything is fine except for one thing - If you try to edit a different field while the background-updated field is being updated, it loses the entered value. Here is a code sample that demonstrates this behavior: (for new form, drop a new DataGridView on:) using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Threading; namespace WindowsFormsApplication2 { public partial class Form1 : Form { private BindingList<foo> flist; private Thread thrd; private BindingSource b; public Form1() { InitializeComponent(); flist = new BindingList<foo> { new foo(){a =1,b = 1, c=1}, new foo(){a =1,b = 1, c=1}, new foo(){a =1,b = 1, c=1}, new foo(){a =1,b = 1, c=1} }; b = new BindingSource(); b.DataSource = flist; dataGridView1.DataSource = b; thrd = new Thread(new ThreadStart(updPRoc)); thrd.Start(); } private void upd() { flist.ToList().ForEach(f=>f.c++); } private void updPRoc() { while (true) { this.BeginInvoke(new MethodInvoker(upd)); Thread.Sleep(1000); } } } public class foo:INotifyPropertyChanged { private int _c; public int a { get; set; } public int b { get; set; } public int c { get {return _c;} set { _c = value; if (PropertyChanged!= null) PropertyChanged(this,new PropertyChangedEventArgs("c")); } } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion } } So, you edit column a or b, you will see that the column c update causes you to lose your entry. Any thoughts appreciated.

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