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• Generic function to handle DataType Conversion

  - by Tommo1977

  I have the following function in C#, that I want to pass a MySQL DataReader value/object. If the value of the object passed is a DBNull I need to handle it and return a Null value of that data type e.g null int. Otherwise I want to convert the returned value like Convert.ToInt32(value) or similar. public static T ConvertFromDB<T>(object value) { return value == DBNull.Value ? default(T) : (T)value; } Can anyone offer any help on this ?

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• How fast can you make linear search?

  - by Mark Probst

  I'm looking to optimize this linear search: static int linear (const int *arr, int n, int key) { int i = 0; while (i < n) { if (arr [i] >= key) break; ++i; } return i; } The array is sorted and the function is supposed to return the index of the first element that is greater or equal to the key. They array is not large (below 200 elements) and will be prepared once for a large number of searches. Array elements after the n-th can if necessary be initialized to something appropriate, if that speeds up the search. No, binary search is not allowed, only linear search.

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• Delete section of streamreader

  - by Luke

  I am reading a file into my program using streamreader. private void loadFile() { lstDeliveryDetails.Items.Clear(); if (!File.Exists("../../MealDeliveries.txt")) { MessageBox.Show("File not found!"); return; } using (StreamReader sr = new StreamReader("../../MealDeliveries.txt")) { //first line is delivery name string strDeliveryName = sr.ReadLine(); while (strDeliveryName != null) { //other lines Delivery d = new Delivery(strDeliveryName, sr.ReadLine(), sr.ReadLine(), sr.ReadLine(), sr.ReadLine(), sr.ReadLine(), sr.ReadLine()); mainForm.myDeliveries.Add(d); //check for further values strDeliveryName = sr.ReadLine(); } } displayDeliveries(); } Eventually I end up with all the deliveries in the following array public static ArrayList myDeliveries = new ArrayList(); It is loaded into the listview. I select an item as follows: iDeliverySelected = lstDeliveryDetails.SelectedItems[0].Index; I am struggling to understand how I can select an item and use a delete button to remove it from the text file?

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• Calling different layers from the same class

  - by khalid

  Hi, I am here to seek some help with my code which i am facing a dead end road with. I'm trying to pass values from screen1.java using Intent to screen2.java. Passing the values is fine and I managed to get through it; however, when I check using if statement the program crash down. Here are my files, plzzzzzzzzzzz help screen1.java package test.android; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; public class screen1 extends Activity { static String strKey = "Hello"; static final String strValue = "Hello"; public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.screen1); //** button A Button A = (Button) findViewById(R.id.btnClickA); A.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { Intent i = new Intent(screen1.this, screen2.class); strKey = "NAME"; i.setClassName("packageName", "packageName.IntentClass"); String term = "Hello"; i.putExtra("packageName.term", term); //i.putExtra(strKey, strValue); startActivity(i); } }); //** //** button B Button B = (Button) findViewById(R.id.btnClickB); B.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { Intent i = new Intent(screen1.this, screen3.class); startActivity(i); } }); //** } } screen2.java package test.android; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; public class screen2 extends Activity { public void onCreate(Bundle icicle) { Bundle extras = getIntent().getExtras(); String term = extras.getString("packageName.term"); System.out.println("--- Name is -->"+ term); if(term.equalsIgnoreCase("Hello") || term.equalsIgnoreCase("Name")){ super.onCreate(icicle); setContentView(R.layout.screen3); Button b = (Button) findViewById(R.id.btnClick3); b.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { setResult(RESULT_OK); finish(); } }); } else { super.onCreate(icicle); setContentView(R.layout.screen2); Button b = (Button) findViewById(R.id.btnClick2); b.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { setResult(RESULT_OK); finish(); } }); } // DOES NOT WORK !!!!!!!!! System.out.println("--- Name is --"+ term); } } Layouts: screen1.xml screen2.xml screen3.xml AndroidManifest.xml <activity android:name="screen1" android:label="SCREEN 1"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="screen2" android:label="SCREEN 2"> </activity> <activity android:name="screen3" android:label="SCREEN 3"> </activity> ===== The error is caused by these lines of code in screen2.java: if(term.equalsIgnoreCase("Hello") || term.equalsIgnoreCase("Name")){ super.onCreate(icicle); setContentView(R.layout.screen3); Button b = (Button) findViewById(R.id.btnClick3); b.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { setResult(RESULT_OK); finish(); } }); } else { super.onCreate(icicle); setContentView(R.layout.screen2); Button b = (Button) findViewById(R.id.btnClick2); b.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { setResult(RESULT_OK); finish(); } }); } **notice if I get rid of the entire IF statement and go with only the ELSE the program works fine.

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• How to use ColorDrawable with ImageView?

  - by user246114

  Hi, I have a layout with an ImageView defined like: <ImageView android:layout_width="45dip" android:layout_height="45dip" android:scaleType="fitXY" /> now I just want to set the imageview to be a static color, like red or green. I'm trying: ColorDrawable cd = new ColorDrawable("FF0000"); cd.setAlpha(255); ImageView iv = ...; iv.setImageDrawable(cd); the imageview is just empty though, no color. The 45dip space is being used up though. What do I need to do to get the color to be rendered? Thanks

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• Java: how to initialize int without assigning a value?

  - by HH

  $ javac InitInt.java InitInt.java:9: '[' expected right = new int; ^ InitInt.java:9: ']' expected right = new int; ^ InitInt.java:13: ';' expected } ^ InitInt.java:14: ';' expected public int getRight(){return right;} ^ InitInt.java:15: reached end of file while parsing } ^ 5 errors $ cat InitInt.java import java.util.*; import java.io.*; public class InitInt { private final int right; public static void main(String[] args) { // I don't want to assign any value. // just initialize it, how? right = new int; // later assiging a value } public int getRight(){return right;} }

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• question about merge algorithm

  - by davit-datuashvili

  hi i have question i know that this question is somehow nonsense but let see i have code to merge two sorted array in a one sorted array here is code in java public class Merge { public static void main(String[]args){ int a[]=new int[]{7,14,23,30,35,40}; int b[]=new int[]{5,8,9,11,50,67,81}; int c[]=new int[a.length+b.length]; int al=0; int bl=0; int cl=0; while (al<a.length && bl<b.length) if (a[al]<b[bl]) c[cl++]=a[al++]; else c[cl++]=b[bl++]; while (al<a.length) c[cl++]=a[al++]; while (bl<b.length) c[cl++]=b[bl++]; for (int j=0;j<c.length;j++){ System.out.println(c[j]); } } } question is why does not work if we write here {} brackets while (al } ?

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• Patterns for simulating optional "out" parameters in C#?

  - by Jesse McGrew

  I'm translating an API from C to C#, and one of the functions allocates a number of related objects, some of which are optional. The C version accepts several pointer parameters which are used to return integer handles to the objects, and the caller can pass NULL for some of the pointers to avoid allocating those objects: void initialize(int *mainObjPtr, int *subObjPtr, int *anotherSubObjPtr); initialize(&mainObj, &subObj, NULL); For the C# version, the obvious translation would use out parameters instead of pointers: public static void Initialize(out int mainObj, out int subObj, out int anotherSubObj); ... but this leaves no way to indicate which objects are unwanted. Are there any well-known examples of C# APIs doing something similar that I could imitate? If not, any suggestions?

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• How to write java program to increase file limit using ulimit

  - by Sunil Kumar Sahoo

  I am using Fedora linux where ulimit -n 10000 increases file limit upto 10000. I want to achieve the same using java program How to write java program to increase file limit using ulimit I have tried with the below program but it didnot work well. The program didnot give any error. but didnot increase file limit also public class IncreaseFIle { public static void main(String[] args) { String command = "/bin/bash ulimit -n 10000"; // String command = "pwd"; try { Runtime.getRuntime().exec(command); } catch (IOException ex) { ex.printStackTrace(); } } } Thanks Sunil Kumar Sahoo

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• Ogg/Vorbis: _ov_fopen cannot be found

  - by knight666

  I'm trying to use Ogg/Vorbis with OpenAL to get sound in my game. Right now I'm simply trying to load a .ogg file and read its data, I'm not actually doing anything with it. I first tried using ov_open, however, the documentation said I should really be using ov_fopen on Windows. However, when I try to use that I get the following: 1>AudioManager.obj : error LNK2019: unresolved external symbol _ov_fopen referenced in function "private: static struct SomeGame::SoundData * __cdecl SomeGame::AudioManager::LoadOGG(char *)" (?LoadOGG@AudioManager@SomeGame@@CAPAUSoundData@2@PAD@Z) ...and when I Google "unresolved external symbol _ov_fopen", I get exactly one result. And it's in Japanese. So I tried downloading the ogg and vorbis source and compiling it, and inserting those in the project, but it still gives me the same error. Basically, how do I load in an Ogg/Vorbis file to be used with OpenAL on Windows? Thanks in advance.

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• asp.net root paths

  - by dejavu

  I am getting the exception when trying to save a file: System.Web.HttpException: The SaveAs method is configured to require a rooted path, and the path '~/Thumbs/TestDoc2//small/ImageExtractStream.bmp' is not rooted. at System.Web.HttpPostedFile.SaveAs(String filename) at System.Web.HttpPostedFileWrapper.SaveAs(String filename) at PitchPortal.Core.Extensions.ThumbExtensions.SaveSmallThumb(Thumb image) in C:\Users\Bich Vu\Documents\Visual Studio 2008\Projects\PitchPortal\PitchPortal.Core\Extensions\ThumbExenstions.cs:line 23 the code is below: public static void SaveSmallThumb(this Thumb image) { var logger = Microsoft.Practices.ServiceLocation.ServiceLocator.Current.GetInstance<ILoggingService>(); string savedFileName = HttpContext.Current.Server.MapPath(Path.Combine( image.SmallThumbFolderPath, Path.GetFileName(image.PostedFile.FileName))); try { image.PostedFile.SaveAs(savedFileName); } catch (Exception ex) { logger.Log(ex.ToString()); } } I cant see what is wrong here, any tips?

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• TypeError: unbound method make_request() must be called with XX instance, but how?

  - by Dave

  Running the code below I get E TypeError: unbound method make_request() must be called with A instance as first argument (got str instance instead) I dont want to set make_request method as static, I want to call it from an instance of an object. The example http://pytest.org/latest/fixture.html#fixture-function # content of ./test_smtpsimple.py import pytest @pytest.fixture def smtp(): import smtplib return smtplib.SMTP("merlinux.eu") def test_ehlo(smtp): response, msg = smtp.ehlo() assert response == 250 assert "merlinux" in msg assert 0 # for demo purposes My code """ """ import pytest class A(object): """ """ def __init__(self, name ): """ """ self._prop1 = [name] @property def prop1(self): return self._prop1 @prop1.setter def prop1(self, arguments): self._prop1 = arguments def make_request(self, sex): return 'result' def __call__(self): return self @pytest.fixture() def myfixture(): """ """ A('BigDave') return A def test_validateA(myfixture): result = myfixture.make_request('male') assert result =='result'

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• Does Parallel.ForEach require AsParallel()

  - by dkackman

  ParallelEnumerable has a static member AsParallel. If I have an IEnumerable<T> and want to use Parallel.ForEach does that imply that I should always be using AsParallel? e.g. Are both of these correct (everything else being equal)? without AsParallel: List<string> list = new List<string>(); Parallel.ForEach<string>(GetFileList().Where(file => reader.Match(file)), f => list.Add(f)); or with AsParallel? List<string> list = new List<string>(); Parallel.ForEach<string>(GetFileList().Where(file => reader.Match(file)).AsParallel(), f => list.Add(f));

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• extract digg data by digg api

  - by vamsivanka

  I am trying to extract digg data for a user using this url "http://services.digg.com/user/vamsivanka/diggs?count=25&appkey=34asd56asdf789as87df65s4fas6" and the web response is throwing an error "The remote server returned an error: (403) Forbidden." Please let me know. public static XmlTextReader CreateWebRequest(string url) { HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url); webRequest.UserAgent = ".NET Framework digg Test Client"; webRequest.Credentials = System.Net.CredentialCache.DefaultCredentials; webRequest.Accept = "text/xml"; HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse(); System.IO.Stream responseStream = webResponse.GetResponseStream(); XmlTextReader reader = new XmlTextReader(responseStream); return reader; }

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• Question on dynamic URL parsing

  - by jerebear

  I see many, many sites that have URLs for individual pages such as http://www.mysite.com/articles/this-is-article-1 http://www.mysite.com/galleries/575 And they don't redirect, they don't run slowly... I know how to parse URL's, that's easy enough. But in my mind, that seems slow and cumbersome on a dynamic site. As well, if the pages are all staticly built (hende the custom URL) then that means all components of the page are static as well... (which would be bad) I'd love to hear some ideas about how this is typically accomplished.

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• error - convert date to showing in view

  - by Ali

  hi i need convert date to shamsi date i create a method that convert DateTime to shamsi Date. when i passing a date to the method i got this error The best overloaded method match for 'BentaAccounting.Classes.GenralClasses.FarsiDate.MiladiToShamsi(System.DateTime)' has some invalid arguments this is the code i am using the method public static string MiladiToShamsi(DateTime Date) { string Result; PersianCalendar FarsiDate = new PersianCalendar(); Result = FarsiDate.GetYear(Date).ToString() + "/" + (FarsiDate.GetMonth(Date) < 10 ? "0" + FarsiDate.GetMonth(Date).ToString() : FarsiDate.GetMonth(Date).ToString()) + "/" + (FarsiDate.GetDayOfMonth(Date) < 10 ? "0" + FarsiDate.GetDayOfMonth(Date).ToString() : FarsiDate.GetDayOfMonth(Date).ToString()); return Result; } and view <%: Html.Encode(GenralClasses.FarsiDate.MiladiToShamsi(item.OrderDate) )%>

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• Animating a font size change in a UITableView

  - by nickthedude

  Hey Simple little app for educational purposes, its a simple uitableview and I want users to be able to use a uislider to adjust the font size as needed. The code I have now works to change the font but only when the view is updated, ie when i pull up or down the table view to reveal other cells. I'd like the font change to be reflected immediately as a user moves the uislider if possible, here's the code that I have working half way: -(UITableViewCell *) tableView: (UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *) indexPath { static NSString *SimpleTableIdentifier = @"SimpleTableIdentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: SimpleTableIdentifier]; if (cell == nil) cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier: SimpleTableIdentifier] autorelease]; NSUInteger row = [indexPath row]; cell.text = [listData objectAtIndex:row]; UIImage *image = [UIImage imageNamed:@"star.png"]; cell.font = [UIFont systemFontOfSize:[fontSlider value]]; cell.image = image; return cell; }

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• [AS2] Use for variable as parameter and keep it different for each iteration

  - by Adam Kiss

  Hello, I have a basic for loop to loop through buttons and set some stuff and onPress handlers: for (i=1;i<=20;i++){ //do some stuff _root["button"+i].onPress = function(){ someMC.gotoAndStop(i+1); } } However, as I noticed, all buttonsthen link to one and same frame - all point to last i + 1 - Is there any possibility to call gotoAndStop with "static" Number, so in next iteration, it won't change? Edit: Ex. for last statement: Iteration 5 will call gAS /*gotoAndStop:]*/(6); Iteration 6 -> gAS(7); Iteration 7 -> gAS(8);

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• Accents in file name using Java on Solaris

  - by Stef

  I have a problem where I can't write files with accents in the file name on Solaris. Given following code public static void main(String[] args) { System.out.println("Charset = "+ Charset.defaultCharset().toString()); System.out.println("testéörtkuoë"); FileWriter fw = null; try { fw = new FileWriter("testéörtkuoë"); fw.write("testéörtkuoëéörtkuoë"); fw.close(); I get following output Charset = ISO-8859-1 test??rtkuo? and I get a file called "test??rtkuo?" Based on info I found on StackOverflow, I tried to call the Java app by adding "-Dfile.encoding=UTF-8" at startup. This returns following output Charset = UTF-8 testéörtkuoë But the filename is still "test??rtkuo?" Any help is much appreciated. Stef

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• svnlook always returns an error and no output

  - by Pierre-Alain Vigeant

  I'm running this small C# test program launched from a pre-commit batch file private static int Test(string[] args) { var processStartInfo = new ProcessStartInfo { FileName = "svnlook.exe", UseShellExecute = false, ErrorDialog = false, CreateNoWindow = true, RedirectStandardOutput = true, RedirectStandardError = true, Arguments = "help" }; using (var svnlook = Process.Start(processStartInfo)) { string output = svnlook.StandardOutput.ReadToEnd(); svnlook.WaitForExit(); Console.Error.WriteLine("svnlook exited with error 0x{0}.", svnlook.ExitCode.ToString("X")); Console.Error.WriteLine("Current output is: {0}", string.IsNullOrEmpty(output) ? "empty" : output); return 1; } } I am deliberately calling svnlook help and forcing an error so I can see what is going on when committing. When this program run, SVN displays svnlook exited with error 0xC0000135. Current output is: empty I looked up the error 0xC0000135 and it mean App failed to initialize properly although it wasn't specific to svnhook. Why is svnlook help not returning anything? Does it fail when executed through another process?

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• Generate dynamic html

  - by Fred

  Hi all, to export some data i want to be able to generate an html output. I have some constant content to output, like html headers and footers. My question is how to deal with that ? Do I have to embed some template (in a ressource file) and parse it to make it dynamic ? Do I store my static content in some constant (is there a 255 char limit?) and append them while generating the dynamic content ? Do you have some hints, useful links, or best practices to share? Thanks

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• Requires a valid Date or x-amz-date header?

  - by Jordan Messina

  I'm getting the following error when attempting to upload a file to S3: S3StorageError: <?xml version="1.0" encoding="UTF-8"?> <Error><Code>AccessDenied</Code><Message>AWS authentication requires a valid Date or x-amz-date header</Message><RequestId>7910FF83F3FE17E2</RequestId><HostId>EjycXTgSwUkx19YNkpAoY2UDDur/0d5SMvGJUicpN6qCZFa2OuqcpibIR3NJ2WKB</HostId></Error> I'm using Django with Django-Storages and Imagekit My S3 settings in my settings.py looks as follows: locale.setlocale(locale.LC_TIME, 'en_US') DEFAULT_FILE_STORAGE = 'backends.s3.S3Storage' AWS_ACCESS_KEY_ID = '************************' AWS_SECRET_ACCESS_KEY = '*****************************' AWS_STORAGE_BUCKET_NAME = 'static.blabla.com' AWS_HEADERS = { 'x-amz-date': datetime.datetime.utcnow().strftime('%a, %d %b %Y %H:%M:%S GMT'), 'Expires': 'Thu, 15 Apr 2200 20:00:00 GMT', } from S3 import CallingFormat AWS_CALLING_FORMAT = CallingFormat.SUBDOMAIN Thanks for any help you can give!

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• Invalid argument when calling linux splice()

  - by benny wallace

  Hi I wanted to try out the splice syscall. I have this function - it should copy content of one file to another: static void test_splice( int in, int out ) { int i = 0, rcvd = 0; int filedes[2]; off_t off = 0; if ( pipe( filedes ) < 0 ) { perror( "Kicha pipe" ); exit( EXIT_FAILURE ); } for ( i = 0; i < NUMLOOPS; ++i ) { if ( ( rcvd = splice( in, NULL, filedes[1], NULL, BUFSIZE, SPLICE_F_MORE | SPLICE_F_MOVE ) ) < 0 ) { perror( "splice" ); exit( EXIT_FAILURE ); } if ( splice( filedes[0], NULL, out, NULL, rcvd, SPLICE_F_MORE | SPLICE_F_MOVE ) < 0 ) { perror( "splice" ); exit( EXIT_FAILURE ); } } } The second call to splice in first iteration returns EINVAL ( invalid argument from perror ) everytime - what could be the reason?

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• Grabbing random object from ArrayList is not random.

  - by Isai

  I am creating a method where if you pass in a parameter of type Random, then it will return a random object. Here is basically what I am trying to do: public T choose(Random r) { int randomInt = r.nextInt(randomList.size()); // randomList is just a instance variable return randomList.get(randomInt); } The random list has this the following strings:[2, 2, 2, 1, 1, 1, 1, c, c, c, a, a, a, a] Then I made a driver with the following code for (int i = 0; i < 10; i++) { System.out.print(rndList.choose(rnd)); // rnd is initialized as a static Random variable } However my outputs are not coming out random. I used the debugger and found out that my choose method generates an integer that is relatively low, so it will always print out either 2's or 1's but never c's or a's. I can't figure out why this is happening and help would be greatly appreciated.

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• why wont this tester complie

  - by user1678800

  student name and id and testgrade need to compile with tester but the student class has some problem i dont know what it is and the error message is Error: Syntax error on token "(", . expected this needs to complie with the tester class to be able to run public class Student { public static void main(String[] args) { // instant varible for name, id , and test grade private String name; private int id; private int testgrade; /** * construct class * @parm String newName * @parm String newId */ public Student(String newName, int newId); { name = newName; id = newId; } /** * getName method that return instant varible name */ public String getName() { return name; } /** * getId method that return instant varible id */ public int getId() { return id; } /** * setGrade method that sets the test grade variable * * @param int grade */ public void setGrade(int grade) { testGrade = grade; } /** * getGrade method that sets test grade instance variable * * @param int grade */ public int getGrade() { return testGrade; } } }

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