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• How to create a random string of characters in C#?

  - by Keltex

  I'm trying to create random strings of characters. I'm wondering if there might be a more efficient way. Here's my algorithm: string RANDOM = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#@$^*()"; StringBuilder sb = new StringBuilder(); int length = rand.Next(10) + 1; for (int idx = 0; idx < length; ++idx) { sb.Append(RANDOM[rand.Next(RANDOM.Length)]); } string RandomString = sb.ToString(); I'm wondering if the StringBuilder is the best choice. Also if selecting a random character from my RANDOM string is the best way.

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• How do I check if a SQL Server 2005 TEXT column is not null or empty using LINQ To Entities?

  - by emzero

  Hi there guys I'm new to LINQ and I'm trying to check whether a TEXT column is null or empty (as String.IsNullOrEmpty). from c in ... ... select new { c.Id, HasBio = !String.IsNullOrEmpty(c.bio) } Trying to use the above query produces an SqlException: Argument data type text is invalid for argument 1 of len function. The SQL generated is similar to the following: CASE WHEN ( NOT (([Extent2].[bio] IS NULL) OR (( CAST(LEN([Extent2].[bio]) AS int)) = 0))) THEN cast(1 as bit) WHEN (([Extent2].[bio] IS NULL) OR (( CAST(LEN([Extent2].[bio]) AS int)) = 0)) THEN cast(0 as bit) END AS [C1] LEN is not applicable to TEXT columns. I know DATALENGTH should be used for them... How can I force LINQ to produce such thing? Or any other workaround to test if a text column is null or empty??? Thanks!

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• What is the best way to marshal a char array function argument?

  - by Seh Hui 'Felix' Leong

  Let say that given the following signature in LegacyLib.dll: int Login(SysInst *inst, char username[8], char password[6]); The simple way to marshal this function in C# would be: [DllImport("LegacyLib.dll", CharSet=CharSet.Ansi)] public static extern int Login(ref SysInst inst, string username, string password); The problem of doing it in a such a naive way is that the managed string we passed into the username or password parameter could be longer than the array bounds and this could potentially cause a buffer overrun in LegacyLib.dll. Is there a better way which overcomes this problem? i.e. is there any quick [MarshalAs(…)] magic that I could use to counter that?

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• C++ overloading operator comma for variadic arguments

  - by uray

  is it possible to construct variadic arguments for function by overloading operator comma of the argument? i want to see an example how to do so.., maybe something like this: template <typename T> class ArgList { public: ArgList(const T& a); ArgList<T>& operator,(const T& a,const T& b); } //declaration void myFunction(ArgList<int> list); //in use: myFunction(1,2,3,4); //or maybe: myFunction(ArgList<int>(1),2,3,4);

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• Constructor Injection and when to use a Service Locator

  - by Simon

  I'm struggling to understand parts of StructureMap's usage. In particular, in the documentation a statement is made regarding a common anti-pattern, the use of StructureMap as a Service Locator only instead of constructor injection (code samples straight from Structuremap documentation): public ShippingScreenPresenter() { _service = ObjectFactory.GetInstance<IShippingService>(); _repository = ObjectFactory.GetInstance<IRepository>(); } instead of: public ShippingScreenPresenter(IShippingService service, IRepository repository) { _service = service; _repository = repository; } This is fine for a very short object graph, but when dealing with objects many levels deep, does this imply that you should pass down all the dependencies required by the deeper objects right from the top? Surely this breaks encapsulation and exposes too much information about the implementation of deeper objects. Let's say I'm using the Active Record pattern, so my record needs access to a data repository to be able to save and load itself. If this record is loaded inside an object, does that object call ObjectFactory.CreateInstance() and pass it into the active record's constructor? What if that object is inside another object. Does it take the IRepository in as its own parameter from further up? That would expose to the parent object the fact that we're access the data repository at this point, something the outer object probably shouldn't know. public class OuterClass { public OuterClass(IRepository repository) { // Why should I know that ThingThatNeedsRecord needs a repository? // that smells like exposed implementation to me, especially since // ThingThatNeedsRecord doesn't use the repo itself, but passes it // to the record. // Also where do I create repository? Have to instantiate it somewhere // up the chain of objects ThingThatNeedsRecord thing = new ThingThatNeedsRecord(repository); thing.GetAnswer("question"); } } public class ThingThatNeedsRecord { public ThingThatNeedsRecord(IRepository repository) { this.repository = repository; } public string GetAnswer(string someParam) { // create activeRecord(s) and process, returning some result // part of which contains: ActiveRecord record = new ActiveRecord(repository, key); } private IRepository repository; } public class ActiveRecord { public ActiveRecord(IRepository repository) { this.repository = repository; } public ActiveRecord(IRepository repository, int primaryKey); { this.repositry = repository; Load(primaryKey); } public void Save(); private void Load(int primaryKey) { this.primaryKey = primaryKey; // access the database via the repository and set someData } private IRepository repository; private int primaryKey; private string someData; } Any thoughts would be appreciated. Simon

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• The system cannot find the path specified with FileWriter

  - by Nazgulled

  Hi, I have this code: private static void saveMetricsToCSV(String fileName, double[] metrics) { try { FileWriter fWriter = new FileWriter( System.getProperty("user.dir") + "\\output\\" + fileTimestamp + "_" + fileDBSize + "-" + fileName + ".csv" ); BufferedWriter csvFile = new BufferedWriter(fWriter); for(int i = 0; i < 4; i++) { for(int j = 0; j < 5; j++) { csvFile.write(String.format("%,10f;", metrics[i+j])); } csvFile.write(System.getProperty("line.separator")); } csvFile.close(); } catch(IOException e) { System.out.println(e.getMessage()); } } But I get this error: C:\Users\Nazgulled\Documents\Workspace\Só Amigos\output\1274715228419_5000-List-ImportDatabase.csv (The system cannot find the path specified) Any idea why? I'm using NetBeans on Windows 7 if it matters...

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• How to bind a List to a WPF treeview using Xaml?

  - by Joan Venge

  I don't know how to bind a List of Drink to a WPF TreeView. struct Drink { public string Name { get; private set; } public int Popularity { get; private set; } public Drink ( string name, int popularity ) : this ( ) { this.Name = name; this.Popularity = popularity; } } List<Drink> coldDrinks = new List<Drink> ( ){ new Drink ( "Water", 1 ), new Drink ( "Fanta", 2 ), new Drink ( "Sprite", 3 ), new Drink ( "Coke", 4 ), new Drink ( "Milk", 5 ) }; } } I have searched the web, for instance saw here. But what's this even mean: ItemsSource="{x:Static local:TreeTest.BoatList}" x:? static? local? How do you specify a collection in your code in the xaml?

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• Loop doesn't update listboxes until it is done iterating

  - by Justen

  I have a loop that takes file name from a listbox, performs a system() call, then moves that filename to another listbox. Problem is, it doesn't move the filenames over one at a time, but waits until the entire loop is finished and moves them all at once. What would I do to get it to perform how I want it to? the loop: for each( String^% file in filename ) { int x = convert( file ); lbComplete->Items->Add( lbFiles->Items[0] ); // place the completed file lbFiles->Items->Remove( lbFiles->Items[0] ); // in the other listbox } The function convert() that contains the system call: int convert( String^ file ) { std::stringstream ss; std::string dir, fileAddress, fileName, outputDir; ... return system( ss.str().c_str() ); }

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• How to select all parents of a node in a hierarchical mysql table?

  - by Ehsan Khodarahmi

  I have a MySQL table that represents data for a tree GUI component, here's the structure of my table: treeTable ( id INT NOT NULL PRIMARY KEY, parentId INT, name VARCHAR(255) ); parentId is a self-referencing foreign key. Now I want to write a stored procedure which gets a node id and returns a result set that contains that node and all of its parents. For example, suppose that my table has filled with this data: 1, null, 'root' 2, 1 , 'level_1' 3, 2 , 'level_2' Now I want to get all parent nodes of node 3 (nodes 1 and 2) and return a result set that contains all tree records. Can anybody help me please?

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• Fast way to set text format for a range of Text using TLF

  - by wezzy

  Hi, i have to set the text format for some tokens in a plain text. I'm trying to use the Text Layout Framework to improve the speed of the operation but i've founded that TLF is far slower (10X in my tests) than the old setTextFormat(). For each token i call this function: public function setTextFormat(format:TextLayoutFormat, begin:int, end:int):void{ var selection:SelectionState = new SelectionState(this._textFlow, begin, end, this._normalFormat); IEditManager(_textFlow.interactionManager).applyLeafFormat(format, selection); } is there any faster and clever way to do this operation ? Thanks

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• How to write a Custom DesignerSerializer for an class used by a Activity (WF)

  - by Stefan Steinegger

  I have a type which is used in a WF activity. It should be serialized. It doesn't work out of the box, most probably because of the private setters in that type. I'm not sure if this is the correct way, but I tried to write my own serializer and declared it on my class. [DesignerSerializer( typeof(FooDesignerSerializer), // my custom serializer typeof(WorkflowMarkupSerializer))] public class Foo { public Foo(int value, string name { // ... } public int Value { get; private set; } public string Name { get; private set; } } Is this the easiest way to get it serialized? How do I write this serializer? That's what I got so far: public class FooDesignerSerializer : WorkflowMarkupSerializer { protected override string SerializeToString( WorkflowMarkupSerializationManager serializationManager, object value) { // how to create a valid / XOML-like string? } }

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• C# Image saving from onPaint method

  - by cheesebunz

  Hi anyone knows how to save an image from the rectangle i created? protected override void OnPaint(PaintEventArgs e) { Bitmap bitmap = new Bitmap(@"Pictures/testing.jpg"); Image img = bitmap; int width = testing.Width / 3; int height = testing.Height / 3; Rectangle destrect = new Rectangle(0, 0, width, height); GraphicsUnit units = GraphicsUnit.Pixel; System.Drawing.Imaging.ImageAttributes imageAttr= new System.Drawing.Imaging.ImageAttributes(); //1.1.jpg// //e.Graphics.DrawImage(img,destrect,0,0, width, height, units, imageAttr); //1.2.jpg// e.Graphics.DrawImage(img, destrect, width, 0,width, height, units, imageAttr); base.OnPaint(e); } I have the desired image that is cropped but i don't know how to save .. Would greatly appreciate any help .

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• Get the caret position when losing focus in WPF

  - by DrLazer

  I have two textbox's. I have an event setup for the "onLostFocus" of the textbox's. If i finish typing a word into both boxes one after the other all is well. At the point where i click back on the first textbox i want to click halfway through the word (perfectly resonable thing for a user to do). When the onLostFocus event fires here is my code : void tbox_LostFocus(object sender, RoutedEventArgs e) { IInputElement focusedelement = FocusManager.GetFocusedElement(this); if (focusedelement is TextBox) { TextBox focusedTextBox = focusedelement as TextBox; int focusIndex = m_commandsStacker.Children.IndexOf(focusedTextBox); int caretIndex = focusedTextBox.CaretIndex; The caret index is 0. At that point I refresh the whole form and set parameters and all other kinds of whizzery, storing the texbox index and caret position to put everything back the same. Why does it return 0 and not the position where the caret should be halfway between the word?

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• what is the mistake in my code

  - by Solitaire

  class myslot { public: Q_OBJECT myslot() { } ~myslot() { } typedef enum Emycars{volvo,benz,tata}cars; public slots: void hellowslot(myslot::cars); }; void myslot::hellowslot(myslot::cars cars1) { } class mysignal { public: Q_OBJECT public: mysignal(myslot *ourslot) { bool val = QObject::connect(this,SIGNAL(hellowsignal(myslot::Emycars)),ourslot,SLOT(hellowslot(myslot::Emycars))); } ~mysignal() { } signals: void hellowsignal(myslot::Emycars); }; int main(int argc, char *argv[]) { QApplication a(argc, argv); myslot slot; mysignal sig(&slot); // DeleteNow w; // w.showMaximized(); return a.exec(); } what is the mistake in mycode, the way which i have written connect for the function which recive enum is right or not? please let me know where i am wrong.

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• Store data for songs MySQL DB

  - by Johan

  I'm storing a huge set of songs in a MySQL database. This is what I store in the 'songs' table: CREATE TABLE `songs` ( `song_id` int(10) unsigned NOT NULL auto_increment, `song_artist` varchar(255) NOT NULL, `song_track` varchar(255) NOT NULL, `song_mix` varchar(255) NOT NULL, `song_title` text NOT NULL, `song_hash` varchar(40) NOT NULL, `song_addtime` int(10) unsigned NOT NULL, `song_source` text NOT NULL, `song_file` varchar(255) NOT NULL, PRIMARY KEY (`song_id`) ) ENGINE=MyISAM AUTO_INCREMENT=1857 DEFAULT CHARSET=latin1 Now I'd like to keep track of how many plays each song has, and other song-specific data that relates to the song. I don't want to keep adding fields to the 'songs' table for this. How can I store song related data a more efficient way? What's the best practice here?

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• PInvokeStackImbalance C# call to unmanaged C++ function

  - by user287498

  After switching to VS2010, the managed debug assistant is displaying an error about an unbalanced stack from a call to an unmanaged C++ function from a C# application. The usuals suspects don't seem to be causing the issue. Is there something else I should check? The VS2008 built C++ dll and C# application never had a problem, no weird or mysterious bugs - yeah, I know that doesn't mean much. Here are the things that were checked: The dll name is correct. The entry point name is correct and has been verified with depends.exe - the code has to use the mangled name and it does. The calling convention is correct. The sizes and types all seem to be correct. The character set is correct. There doesn't seem to be any issues after ignoring the error and there isn't an issue when running outside the debugger. C#: [DllImport("Correct.dll", EntryPoint = "SuperSpecialOpenFileFunc", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi, ExactSpelling = true)] public static extern short SuperSpecialOpenFileFunc(ref SuperSpecialStruct stuff); [StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)] public struct SuperSpecialStruct { public int field1; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)] public string field2; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)] public string field3; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)] public string field4; public ushort field5; public ushort field6; public ushort field7; public short field8; public short field9; public uint field10; public short field11; }; C++: short SuperSpecialOpenFileFunc(SuperSpecialStruct * stuff); struct SuperSpecialStruct { int field1; char field2[256]; char field3[20]; char field4[10]; unsigned short field5; unsigned short field6; unsigned short field7; short field8; short field9; unsigned int field10; short field11; }; Here is the error: Managed Debugging Assistant 'PInvokeStackImbalance' has detected a problem in 'Managed application path'. Additional Information: A call to PInvoke function 'SuperSpecialOpenFileFunc' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.

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• NSNumberFormatter and 'th' 'st' 'nd' 'rd' (ordinal) number endings

  - by jan

  Is there a way to use NSNumberFormatter to get the 'th' 'st' 'nd' 'rd' number endings? EDIT: Looks like it does not exist. Here's what I'm using. +(NSString*)ordinalNumberFormat:(NSInteger)num{ NSString *ending; int ones = num % 10; int tens = floor(num / 10); tens = tens % 10; if(tens == 1){ ending = @"th"; }else { switch (ones) { case 1: ending = @"st"; break; case 2: ending = @"nd"; break; case 3: ending = @"rd"; break; default: ending = @"th"; break; } } return [NSString stringWithFormat:@"%d%@", num, ending]; } Adapted from nickf's answer here http://stackoverflow.com/questions/69262/is-there-an-easy-way-in-net-to-get-st-nd-rd-and-th-endings-for-numbers

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• Handling exception form unmanaged dll in C#

  - by StuffHappens

  Hello. I have the following function written in C# public static string GetNominativeDeclension(string surnameNamePatronimic) { if(surnameNamePatronimic == null) throw new ArgumentNullException("surnameNamePatronimic"); IntPtr[] ptrs = null; try { ptrs = StringsToIntPtrArray(surnameNamePatronimic); int resultLen = MaxResultBufSize; int err = decGetNominativePadeg(ptrs[0], ptrs[1], ref resultLen); ThrowException(err); return IntPtrToString(ptrs, resultLen); } catch { return surnameNamePatronimic; } finally { FreeIntPtr(ptrs); } } Function decGetNominativePadeg is in unmanaged dll [DllImport("Padeg.dll", EntryPoint = "GetNominativePadeg")] private static extern Int32 decGetNominativePadeg(IntPtr surnameNamePatronimic, IntPtr result, ref Int32 resultLength); and throws an exception: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. The catch that is in C# code doesn't actually catch it. Why? How to handle this exception? Thank you for your help!

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• undefined C struct forward declaration

  - by robUK

  Hello, I have a header file port.h, port.c, and my main.c I get the following error: 'ports' uses undefined struct 'port_t' I thought as I have declared the struct in my .h file and having the actual structure in the .c file was ok. I need to have the forward declaration as I want to hide some data in my port.c file. In my port.h I have the following: /* port.h */ struct port_t; port.c: /* port.c */ #include "port.h" struct port_t { unsigned int port_id; char name; }; main.c: /* main.c */ #include <stdio.h> #include "port.h" int main(void) { struct port_t ports; return 0; } Many thanks for any suggestions,

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• How do you delete rows from UITableView?

  - by James

  This has been bugging me for hours now and i have not been able to figure it out. I am importing data into a tableview using core data and NSMutableArray. As shown below. CORE DATA ARRAY NSMutableArray *mutableFetchResults = [CoreDataHelper getObjectsFromContext:@"Spot" :@"Name" :YES :managedObjectContext]; self.entityArray = mutableFetchResults; TABLE VIEW - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { NSManagedObject *object = (NSManagedObject *)[entityArray objectAtIndex:indexPath.row]; NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease]; } NSString *lat1 = [object valueForKey:@"Email"]; //NSLog(@"Current Spot Latitude:%@",lat1); float lat2 = [lat1 floatValue]; //NSLog(@"Current Spot Latitude Float:%g", lat2); NSString *long1 = [object valueForKey:@"Description"]; //NSLog(@"Current Spot Longitude:%@",long1); float long2 = [long1 floatValue]; //NSLog(@"Current Spot Longitude Float:%g", long2); //Getting current location from NSDictionary CoreDataTestAppDelegate *appDelegate = (CoreDataTestAppDelegate *) [[UIApplication sharedApplication] delegate]; NSString *locLat = [NSString stringWithFormat:appDelegate.latitude]; float locLat2 = [locLat floatValue]; //NSLog(@"Lat: %g",locLat2); NSString *locLong = [NSString stringWithFormat:appDelegate.longitude]; float locLong2 = [locLong floatValue]; //NSLog(@"Long: %g",locLong2); //Distance Shizzle //Prime's Location CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:lat2 longitude:long2]; //Home Location CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:locLat2 longitude:locLong2]; double distance = [loc1 getDistanceFrom: loc2] / 1000; int myInt = (int)(distance + (distance>0 ? 0.5 : -0.5)); //NSLog(@"INT VAL :%i", myInt); NSMutableString* converted = [NSMutableString stringWithFormat:@"%.1f", distance]; [converted appendString: @" Km"]; //NSLog(@"Distance between Prime and home = %g", converted); if (myInt < 11) { cell.textLabel.text = [object valueForKey:@"Name"]; cell.detailTextLabel.text = [NSString stringWithFormat:converted]; } else { } // Configure the cell... return cell; } I am trying to get the table only to display results that are within a certain distance. This method here works apart from the fact that the results over a certain distance are still in the table, they are just not graphically visible. I am led to believe that i have to carry out the filtering process before the formatting the table but i can not seem to do this. Please help. My xcode skills are not brilliant so code suggestions would be helpfull.

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• MySQL SELECT, store in a variable

  - by rlb.usa

  For a stored procedure, I want to do a SELECT, and store a column's value into a variable. How do I do this? I want to do something like this: DECLARE countTemp INT; SET countTemp=(SELECT COUNT(Name) FROM mytable WHERE Name= var_name LIMIT 0,1); OR, like this : DECLARE countTemp INT; SELECT countTemp=ColumnXYZ FROM mytable WHERE Name= var_name LIMIT 0,1; But, I tried these and MySQL says my syntax is incorrect; how do I do something like this?

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• Need help with SQL query on SQL Server 2005

  - by Avinash

  We're seeing strange behavior when running two versions of a query on SQL Server 2005: version A: SELECT otherattributes.* FROM listcontacts JOIN otherattributes ON listcontacts.contactId = otherattributes.contactId WHERE listcontacts.listid = 1234 ORDER BY name ASC version B: DECLARE @Id AS INT; SET @Id = 1234; SELECT otherattributes.* FROM listcontacts JOIN otherattributes ON listcontacts.contactId = otherattributes.contactId WHERE listcontacts.listid = @Id ORDER BY name ASC Both queries return 1000 rows; version A takes on average 15s; version B on average takes 4s. Could anyone help us understand the difference in execution times of these two versions of SQL? If we invoke this query via named parameters using NHibernate, we see the following query via SQL Server profiler: EXEC sp_executesql N'SELECT otherattributes.* FROM listcontacts JOIN otherattributes ON listcontacts.contactId = otherattributes.contactId WHERE listcontacts.listid = @id ORDER BY name ASC', N'@id INT', @id=1234; ...and this tends to perform as badly as version A.

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• 0xDEADBEEF equivalent for 64-bit development?

  - by Peter Mortensen

  For C++ development for 32-bit systems (be it Linux, Mac OS or Windows, PowerPC or x86) I have initialised pointers that would otherwise be undefined (e.g. they can not immediately get a proper value) like so: int *pInt = reinterpret_cast<int *>(0xDEADBEEF); (To save typing and being DRY the right-hand side would normally be in a constant, e.g. BAD_PTR.) If pInt is dereferenced before it gets a proper value then it will crash immediately on most systems (instead of crashing much later when some memory is overwritten or going into a very long loop). Of course the behavior is dependent on the underlying hardware (getting a 4 byte integer from the odd address 0xDEADBEEF from a user process may be perfectly valid), but the crashing has been 100% reliable for all the systems I have developed for so far (Mac OS 68xxx, Mac OS PowerPC, Linux Redhat Pentium, Windows GUI Pentium, Windows console Pentium). For instance on PowerPC it is illegal (bus fault) to fetch a 4 byte integer from an odd address. What is a good value for this on 64-bit systems?

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• Putting WPF Control (ComboBox) into canvas with Visuals

  - by Mikhail

  I am writing a WPF chart and use Visuals for performance. The code looks like: public class DrawingCanvas2 : Canvas { private List<Visual> _visuals = new List<Visual>(); protected override Visual GetVisualChild( int index ) { return _visuals[index]; } protected override int VisualChildrenCount { get { return _visuals.Count; } } public void AddVisual( Visual visual ) { _visuals.Add( visual ); base.AddVisualChild( visual ); base.AddLogicalChild( visual ); } } Beside DrawingVisual elements (line, text) I need a ComboBox in the chart. So I tried this: public DrawingCanvas2() { ComboBox box = new ComboBox(); AddVisual( box ); box.Width = 100; box.Height = 30; Canvas.SetLeft( box, 10 ); Canvas.SetTop( box, 10 ); } but it does not work, there is no ComboBox displayed. What I am missing?

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• Loop through hex variable in C

  - by Jud Stephenson

  I have the following code in a project that write's the ascii representation of packet to a unix tty: int written = 0; int start_of_data = 3; //write data to fifo while (length) { if ((written = write(fifo_fd, &packet[start_of_data], length)) == -1) { printf("Error writing to FIFO\n"); } else { length -= written; } } I just want to take the data that would have been written to the socket and put it in a variable. to debug, I have just been trying to printf the first letter/digit. I have tried numerous ways to get it to print out, but I keep getting hex forms (I think). The expected output is: 13176 and the hex value is: 31 33 31 37 36 0D 0A (if that is even hex) Obviously my C skills are not the sharpest tools in the shed. Any help would be appreciated.

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