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  • Dart Can't get logging statements to compile

    - by Nate Lockwood
    I'm trying to learn how to implement logging using the examples/tutorial in: http://blog.dartwatch.com/2013/05/campaign-to-use-real-logging-instead-of.html#comment-form But having imported the libraries this line in main will not compile because the class 'PrintHandler' is not recognized and Google has not been a help in this case. My server application consists of a main and three classes. I'm new at Dart. Below I've extracted the logging code that I added. In what library is 'PrintHandler'? Is this a class I need to write? library server; import 'package:logging_handlers/logging_handlers_shared.dart'; import 'package:logging/logging.dart'; final _serverLogger = new Logger("server"); // top level logger void main() { Logger.root.onRecord.listen(new PrintHandler()); // default PrintHandler _serverLogger.fine("Server created"); } class A { } class B { } class C { }

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  • "Dynamic" localized display of custom DateTimePicker format

    - by S.C. Madsen
    I have a Winform application with 2 DateTimePicker's on it, initialized as follows: private void InitializeComponent() { ... this._StartDate.Format = System.Windows.Forms.DateTimePickerFormat.Short; .... this._StartTime.CustomFormat = System.Globalization.DateTimeFormatInfo.CurrentInfo.ShortTimePattern; this._StartTime.Format = System.Windows.Forms.DateTimePickerFormat.Custom; ... } My question is: When I pick a new region from "Regional and Language Options" in the Control Panel, the _StartDate display is updated to reflect the new regional settings, but the _StartTime is not. Why?

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  • Controlling the visibility of a Bitmap in .NET

    - by ET
    Hi everyone, I am trying to create this simple application in c#: when the user double clicks on specific location in the form, a little circle will be drawn. By one click, if the current location is marked by a circle - the circle will be removed. I am trying to do this by simply register the MouseDoubleClick and MouseClick events, and to draw the circle from a .bmp file the following way: private void MouseDoubleClick (object sender, MouseEventArgs e) { Graphics g = this.CreateGraphics(); Bitmap myImage = (Bitmap)Bitmap.FromFile("Circle.bmp"); g.DrawImage(myImage, e.X, e.Y); } My problem is that I dont know how to make the circle unvisible when the user clicks its location: I know how to check if the selected location contains a circle (by managing a list of all the locations containig circles...), but I dont know how exactly to delete it. Another question: should I call the method this.CreateGraphics() everytime the user double-clicks a location, as I wrote in my code snippet, or should I call it once on initialization?

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  • toString() Method question

    - by cdominguez13
    I've been working on this assignemnt here's code: public class Student { private String fname; private String lname; private String studentId; private double gpa; public Student(String studentFname,String studentLname,String stuId,double studentGpa) { fname = studentFname; lname = studentLname; studentId = stuId; gpa = studentGpa; } public double getGpa() { return gpa; } public String getStudentId() { return studentId; } public String getName() { return lname + ", " + fname; } public void setGpa(double gpaReplacement) { if (gpaReplacement >= 0.0 && gpaReplacement <= 4.0) gpa = gpaReplacement; else System.out.println("Invalid GPA! Please try again."); System.exit(0); } } Now I need to create a toString() method that returns a String formatted something like this: Name: Wilson, Mary Ann ID number: 12345 GPA: 3.5

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  • bitfield mask calculation macro

    - by Aidan Cully
    We have a set of C macros, here, for using the preprocessor to do bitfield operations, and we run into warnings when attempting to use these macros in visual studio. The problem can be demonstrated very easily: #define BITFIELD_WIDTHMASK(Width) \ ((Width) >= 32 ? ~0x0ul : (1ul << (Width)) - 1) unsigned long foo(void) { return BITFIELD_WIDTHMASK(32); } Compiling this with MSVC yields the warning: test.c(12) : warning C4293: '<<' : shift count negative or too big, undefined behavior This isn't a behavior problem - the << operator won't be used in this case, and that should be detected at compile time. But does anyone have any suggestions about how to rewrite the macro to avoid the warning? Or, failing that, how to redesign the macro interface for this? Thanks in advance

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  • How can I clear the Android app cache?

    - by Srao
    I am writing a app which can programatically clear application cache of all the third party apps installed on the device. Following is the code snippet for Android 2.2 public static void trimCache(Context myAppctx) { Context context = myAppctx.createPackageContext("com.thirdparty.game", Context.CONTEXT_INCLUDE_CO|Context.CONTEXT_IGNORE_SECURITY); File cachDir = context.getCacheDir(); Log.v("Trim", "dir " + cachDir.getPath()); if (cachDir!= null && cachDir.isDirectory()) { Log.v("Trim", "can read " + cachDir.canRead()); String[] fileNames = cachDir.list(); //Iterate for the fileName and delete } } My manifest has following permissions: android.permission.CLEAR_APP_CACHE android.permission.DELETE_CACHE_FILES Now the problem is that the name of the cache directory is printed but the list of files cachDir.list() always returns null. I am not able to delete the cache directory since the file list is always null. Is there any other way to clear the application cache?

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  • Are static delegates thread-safe?

    - by leypascua
    Consider this code snippet: public static class ApplicationContext { private static Func<TService> Uninitialized<TService>() { throw new InvalidOperationException(); } public static Func<IAuthenticationProvider> AuthenticationProvider = Uninitialized<IAuthenticationProvider>(); public static Func<IUnitOfWorkFactory> UnitOfWorkFactory = Uninitialized<IUnitOfWorkFactory>(); } //can also be in global.asax if used in a web app. public static void Main(string[] args) { ApplicationContext.AuthenticationProvider = () => new LdapAuthenticationProvider(); ApplicationContext.UnitOfWorkFactory = () => new EFUnitOfWorkFactory(); } //somewhere in the code.. say an ASP.NET MVC controller ApplicationContext.AuthenticationProvider().SignIn(username, true); Are delegates in the static class ApplicationContext thread-safe in the sense that multiple-threads can invoke them? What potential problems will I face if I pursue this approach?

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  • Reading a memorystream

    - by user1842828
    Using several examples here on StackOverflow I thought the following code would decompress a gzip file then read the memory-stream and write it's content to the console. No errors occur but I get no output. public static void Decompress(FileInfo fileToDecompress) { using (FileStream originalFileStream = fileToDecompress.OpenRead()) { string currentFileName = fileToDecompress.FullName; string newFileName = currentFileName.Remove(currentFileName.Length - fileToDecompress.Extension.Length); using (FileStream decompressedFileStream = File.Create(newFileName)) { using (GZipStream decompressionStream = new GZipStream(originalFileStream, CompressionMode.Decompress)) { MemoryStream memStream = new MemoryStream(); memStream.SetLength(decompressedFileStream.Length); decompressedFileStream.Read(memStream.GetBuffer(), 0, (int)decompressedFileStream.Length); memStream.Position = 0; var sr = new StreamReader(memStream); var myStr = sr.ReadToEnd(); Console.WriteLine("Stream Output: " + myStr); } } } }

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  • XAML resources aren't loaded when calling from different project

    - by svick
    I have a WPF project with some styles in XAML in Application.Resources. This works perfectly fine. But when I open a window from this project from another one (this one is a console application), the resources from XAML aren't loaded. When I first tried it, I got a XamlParseException on StaticResource calls in XAML, so I changed it to DynamicResource and now the style just doesn't get loaded. How do I fix this? The code I use: [STAThread] static void Main() { App app = new App(); MyWindow wnd = new MyWindow (); wnd.Show(); app.Run(); }

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  • A Better way? Finding ASP.NET controls, finding their id

    - by CSharp
    I have a method that finds all the controls, iterates through them, determines if they are a textbox,drop down list, etc.. retrieves their ID name, and depending on the ID name it will set a boolean statement (thus I would know if that section of the form is complete, and will email to a certain group of people) unfortunetly this is done with too many if statements and was wondering if I could get some help making this more manageable protected void getEmailGroup() { Control[] allControls = FlattenHierachy(Page); foreach (Control control in allControls) { if (control.ID != null) { if (control is TextBox) { TextBox txt = control as TextBox; if (txt.Text != "") { if (control.ID.StartsWith("GenInfo_")) { GenInfo = true; } if (control.ID.StartsWith("EmpInfo_")) { EmpInfo = true; } } } if (control is DropDownList) { DropDownList lb = control as DropDownList; if (lb.SelectedIndex != -1) { if (control.ID.StartsWith("GenInfo_")) { GenInfo = true; } if (control.ID.StartsWith("EmpInfo_")) { EmpInfo = true; } } } } } }

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  • I'm new to Java most basic question about arrays!

    - by ambidextorous
    Hey I have not been able to find a proper answer on any forums about this but how exactly do I pass an array to a class? public class TestArray { String name; String[] array; public TestArray(String name, String[] anArray){ this.name = name; int len = anArray.length; this.array = new String[len]; for (int i = 0; i < len; i++){ this.array[i] = new String(anArray[i]); } } } public static void main(String[] args){ String[] anArray = new String[2]; anArray[0] = new String("Test"); anArray[1] = new String("Test2"); TestArray work = new TestArray("Jordan", anArray?); } }

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  • C# Generic method type argument inference

    - by CaptainCasey
    Is there any way that I can generalise the type definitions here? Ideally, I'd like to be able to change the type of 'testInput' and have test correctly infer the type at compile time. public static void Run() { var testInput = 3; var test = ((Func<int, int>) Identity).Compose<int,int,int>(n => n)(testInput); Console.WriteLine(test); } public static Func<T, V> Compose<T, U, V>(this Func<U, V> f, Func<T, U> g) { return x => f(g(x)); } public static T Identity<T> (this T value) { return value; }

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  • Nested fragments survive screen rotation

    - by ievgen
    I've faced with an issue with Nested Fragments in Android. When I rotate the screen the Nested Fragments survive somehow. I've come up with a sample example to illustrate this issue. public class ParentFragment extends BaseFragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_parent, container); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); getChildFragmentManager() .beginTransaction() .add(getId(), new ParentFragmentChild(), ParentFragmentChild.class.getName()) .commit(); } @Override public void onResume() { super.onResume(); log.verbose("onResume(), numChildFragments: " + getChildFragmentManager().getFragments().size()); } } public class ParentFragmentChild extends BaseFragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_child, null); } } BaseFragment just logs method calls. This is what I see when I rotate the screen. When Activity initially appears ParentFragment? onAttach(): ParentFragment{420d0a98 #0 id=0x7f060064} ParentFragment? onCreate() ParentFragment? onViewCreated() ParentFragmentChild? onAttach(): ParentFragmentChild{420d08d0 #0 id=0x7f060064 com.kinoteatr.ua.filmgoer.test.ParentFragmentChild} ParentFragmentChild? onCreate() ParentFragmentChild? onViewCreated() ParentFragment? onResume() ParentFragment? onResume(), numChildFragments: 1 ParentFragmentChild? onResume() Screen rotation #1 ParentFragmentChild? onPause() ParentFragment? onPause() ParentFragment? onSaveInstanceState() ParentFragmentChild? onSaveInstanceState() ParentFragmentChild? onStop() ParentFragment? onStop() ParentFragmentChild? onDestroyView() ParentFragment? onDestroyView() ParentFragmentChild? onDestroy() ParentFragmentChild? onDetach() ParentFragment? onDestroy() ParentFragment? onDetach() ParentFragment? onAttach(): ParentFragment{4211bc38 #0 id=0x7f060064} ParentFragment? onCreate() ParentFragmentChild? onAttach(): ParentFragmentChild{420f4180 #0 id=0x7f060064 com.kinoteatr.ua.filmgoer.test.ParentFragmentChild} ParentFragmentChild? onCreate() ParentFragment? onViewCreated() ParentFragmentChild? onViewCreated() ParentFragmentChild? onAttach(): ParentFragmentChild{42132a08 #1 id=0x7f060064 com.kinoteatr.ua.filmgoer.test.ParentFragmentChild} ParentFragmentChild? onCreate() ParentFragmentChild? onViewCreated() ParentFragment? onResume() ParentFragment? onResume(), numChildFragments: 2 ParentFragmentChild? onResume() ParentFragmentChild? onResume() Screen rotation #2 ParentFragmentChild? onPause() ParentFragmentChild? onPause() ParentFragment? onPause() ParentFragment? onSaveInstanceState() ParentFragmentChild? onSaveInstanceState() ParentFragmentChild? onSaveInstanceState() ParentFragmentChild? onStop() ParentFragmentChild? onStop() ParentFragment? onStop() ParentFragmentChild? onDestroyView() ParentFragmentChild? onDestroyView() ParentFragment? onDestroyView() ParentFragmentChild? onDestroy() ParentFragmentChild? onDetach() ParentFragmentChild? onDestroy() ParentFragmentChild? onDetach() ParentFragment? onDestroy() ParentFragment? onDetach() ParentFragment? onAttach(): ParentFragment{42122a48 #0 id=0x7f060064} ParentFragment? onCreate() ParentFragmentChild? onAttach(): ParentFragmentChild{420ffd48 #0 id=0x7f060064 com.kinoteatr.ua.filmgoer.test.ParentFragmentChild} ParentFragmentChild? onCreate() ParentFragmentChild? onAttach(): ParentFragmentChild{420fffa0 #1 id=0x7f060064 com.kinoteatr.ua.filmgoer.test.ParentFragmentChild} ParentFragmentChild? onCreate() ParentFragment? onViewCreated() ParentFragmentChild? onViewCreated() ParentFragmentChild? onViewCreated() ParentFragmentChild? onAttach(): ParentFragmentChild{42101488 #2 id=0x7f060064 com.kinoteatr.ua.filmgoer.test.ParentFragmentChild} ParentFragmentChild? onCreate() ParentFragmentChild? onViewCreated() ParentFragment? onResume() ParentFragment? onResume(), numChildFragments: 3 ParentFragmentChild? onResume() ParentFragmentChild? onResume() ParentFragmentChild? onResume() They keep getting multiplied. Does anybody know why is that ?

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  • Repeating animations using the Stop Selector

    - by Tiago
    I'm trying to repeat an animation until a certain condition is met. Something like this: - (void) animateUpdate { if (inUpdate) { [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:2.0]; [UIView setAnimationDelegate: self]; [UIView setAnimationDidStopSelector: @selector(animateUpdate)]; button.transform = CGAffineTransformMakeRotation( M_PI ); [UIView commitAnimations]; } } This will run the first time, but it won't repeat. The selector will just be called until the application crashes. How should I do this? Thanks.

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  • UIView animations on a path not linear

    - by chis54
    I have an iOS application that I want to animate a falling leaf (or several). I have my leaf image in an ImageView and I've figured out a simple animation from the documentation: [UIView animateWithDuration:4.0f delay:0 options:UIViewAnimationTransitionFlipFromLeft animations:^(void) { leaf1ImageView.frame = CGRectMake(320, 480, leaf1ImageView.frame.size.width,leaf1ImageView.frame.size.height); } completion:NULL]; This will make the leaf go from its starting position to the bottom right corner in a straight line. How would I animate this to follow a path or curve like a parabola or sinusoid and maybe even rotate the image or view? Would this be done in the animations block? Thanks in advance!

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  • How can I work with the Tag property of a winforms checked listbox item?

    - by JMSA
    How can I write a C# winforms code like this? CheckedListBox items don't have 'Tag' and 'ValueMember' properties. I know there are many alternatives to this. But I need to work it this way. private void LoadPermissionsToCheckedListBox() { Role selctedRole = (Role)comboBox1.SelectedItem; int i = 0; foreach (Permission p in selctedRole.PermissionItems) { checkedListBox1.Items.Add(p); checkedListBox1.Items[i].Tag = p; } checkedListBox1.DisplayMember = "PermissionKey"; checkedListBox1.ValueMember = "PermissionID"; }

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  • Hashmap method not accepting defined parameters

    - by Ocasta Eshu
    My assignment is to implement a contact list in a HashMap. All has gone well except for the problem in the code below. the HashMap method put(K key, V value) isnt accepting the defined parameters String, List. public ContactList(){ private HashMap<String, List<String>> map; public void update(String name, List<String> number){ this.map.put(name, number) The error is: The method put(String, List<String>) is undefined for the type ContactList How do I correct this?

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  • Method params match signature, but still getting error

    - by Jason
    I am in the midst of converting a VB library to C#. One of my methods has the following signature in VB: Private Shared Sub FillOrder(ByVal row As DataRowView, ByRef o As Order) In C# I converted it to: private static void FillOrder(DataRowView row, ref Order o) From my constructor inside my Order class, I am calling the FillOrder() method like so: DataView dv = //[get the data] if (dv.Count > 0) { FillOrder(dv[0], this); } In VB, this works: Dim dv As DataView = '[get data]' If dv.Count > 0 Then FillOrder(dv.Item(0), Me) End If However, in VS10 in the C# file I am getting a red squiggle under this call with the following error: The best overloaded method match for [the method] has some invalid arguments This was working code in VB. What am I doing wrong?

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  • Starting a browser from a textbox via Intent - Is http:// required?

    - by VitalyB
    Hi, I have the following code: /** Open a browser on the URL specified in the text box */ private void openBrowser() { Uri uri = Uri.parse(urlText.getText().toString()); Intent intent = new Intent(Intent.ACTION_VIEW, uri); startActivity(intent); } When I input "http://www.google.com" to the textbox, it works fine. However, when I try something like "www.google.com" it crashes with: No Activity found to handle Intent { act=android.intent.action.VIEW dat=www.google.com } Am I using Uri wrong? Is there a way to extract full address from it? Or am I supposed to write code that adds http manually? e.g, if not starts with http://, add http://. Thanks!

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  • apache commons http client efficiency

    - by wo_shi_ni_ba_ba
    I use apache commons http client to send data via post every second, is there a way to make the following code more efficient? I know http is stateless, but is there anything I can do to improve since the base url is always the same in this case(only the parameter value change. private void sendData(String s){ try { HttpClient client = getHttpClient(); HttpPost method = new HttpPost("http://192.168.1.100:8080/myapp"); System.err.println("send to server "+s); List formparams = new ArrayList(); formparams.add(new BasicNameValuePair("packet", s)); UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8"); method.setEntity(entity); HttpResponse resp=client.execute(method); String res = EntityUtils.toString(resp.getEntity()); System.out.println(res); } catch (Exception e) { e.printStackTrace(); } } private HttpClient getHttpClient() { if(httpClient==null){ httpClient = new DefaultHttpClient(); } return httpClient; }

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  • HardCoded the import path in eclipse plugins development

    - by user295636
    Hi In eclipse when we open:- **File-Import-General-Existing Project into workspace then it prompt a import window. Where We have to select a Root project Directory(Browse)..so in this i want to hardcode the Browse path. By default it goes to workspace directory..but i want a fix path like.. C:\Tmp ..while click on browse button it should go to C:\Tmp directory....Can anyone help me in this.. how to do this i have tried setfilterpath() but it is not supporting in wizard case..i have done my code like this: public class OpenImportWizardAction extends Action { public void run() { IWorkbench workbench = PlatformUI.getWorkbench(); Shell shell = workbench.getActiveWorkbenchWindow().getShell(); ExternalProjectImportWizard wizard= new ExternalProjectImportWizard(); wizard.init(workbench,new StructuredSelection()); WizardDialog dialog= new WizardDialog(shell, wizard); dialog.create(); dialog.open(); } }

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  • How to keep a Generic list unmodified when its copy is modified?

    - by user1801934
    When I create a copy of the original list lstStudent in lstCopy and send the lstCopy to modification function, the lstStudent also gets modified. I want to keep this list unmodified. List<Student> lstStudent = new List<Student>(); Student s = new Student(); s.Name = "Akash"; s.ID = "1"; lstStudent.Add(s); List<Student> lstCopy = new List<Student>(lstStudent); Logic.ModifyList(lstCopy); // "Want to use lstStudent(original list) for rest part of the code" public static void ModifyList(List<Student> lstIntegers) { foreach (Student s in lstIntegers) { if (s.ID.Equals("1")) { s.ID = "4"; s.Name = "APS"; } } }

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  • __FILE__ In .h what does it resolve to

    - by Pablitorun
    Is there a specification on how the FILE macro will be expanded if it is in a .h? So if I #define MYFILE __FILE__ in foo.h and foo.c #includes "foo.h" void main(){ printf("%s",MYFILE); .... does this output foo.h or foo.c? (Yes I realize this is a stupid example) Sorry for what should be a simple question. The documentation on the web seems conflicting. For what it is worth VS2008 comes back as foo.c which is what I would expect....I think. I am just trying to confirm if this is defined behavior.

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  • Is it a good practice to pass struct object as parameter to a function in c++?

    - by tsubasa
    I tried an example live below: typedef struct point { int x; int y; } point; void cp(point p) { cout<<p.x<<endl; cout<<p.y<<endl; } int main() { point p1; p1.x=1; p1.y=2; cp(p1); } The result thats printed out is: 1 2 which is what I expected. My question is: Does parameter p get the full copy of object p1? If so, I wonder if this is a good practice? (I assumed when the struct gets big in size, this will create a lot of copy overhead).

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  • test cases for testing a strtok-alike function [C++]

    - by Neeraj
    Consider the following class definition: class StrToTokens { StrToTokens(const char* str, const char* delimiters = "\t\r\n"); //constructor string getNextToken(); void reset(); bool empty(); } Can someone list some good testcases to test the above class. A few I could think of are: empty string, empty delimiters, repeated delimiters, consecutive delimiters, string with only delimiters. However, the interviewer expected some more(better ones). Can you help out. Thanks.

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