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  • Casting a non-generic type to a generic one

    - by John Sheehan
    I've got this class: class Foo { public string Name { get; set; } } And this class class Foo<T> : Foo { public T Data { get; set; } } Here's what I want to do: public Foo<T> GetSome() { Foo foo = GetFoo(); Foo<T> foot = (Foo<T>)foo; foot.Data = GetData<T>(); return foot; } What's the easiest way to convert Foo to Foo<T>? I can't cast directly InvalidCastException) and I don't want to copy each property manually (in my actual use case, there's more than one property) if I don't have to. Is a user-defined type conversion the way to go?

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  • exceptions with python unicode encode/decode functions (why doesn't errors=ignore actually ignore th

    - by gatoatigrado
    Does anyone know why the string conversion functions throw exceptions when errors="ignore" is passed? How can I convert from regular Python string objects to unicode without errors being thrown? Thanks very much! python -c "import codecs; codecs.open('tmp', 'wb', encoding='utf8', errors='ignore').write('?????')" returns Traceback (most recent call last): File "", line 1, in File "/usr/lib/python2.6/codecs.py", line 686, in write return self.writer.write(data) File "/usr/lib/python2.6/codecs.py", line 351, in write data, consumed = self.encode(object, self.errors) UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)

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  • Accessing the feed/entry/id field of an ATOM 1.0 feed with the ROME library

    - by PartlyCloudy
    Hi, I feel a bit stupid asking this question, but I don't know how I can access the ID field of an entry when using ROME to parse an Atom feed. ROME provides it's own meta level of feeds/items, i.e. SyndFeed and SyndEntry. Being an abstraction over RSS and ATOM they only contain elements both formats support. Thus, there is no method to get an ID of an entry. There also exist low level packages for the distinct formats, and the Atom package contains com.sun.syndication.feed.atom.Entry, which provides getId(). However, I don't know how can I convert my SyndEntry into an Entry. I have not found a way to convert it. The (outdated) tutorials show a conversion, but that's only for output though. So how can I easily access the ID field? Thanks in advance.

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  • Type casting needed for byte = byte - byte?

    - by Vaccano
    I have the following code: foreach (byte b in bytes) { byte inv = byte.MaxValue - b; // Add the new value to a list.... } When I do this I get the following error: Cannot implicitly convert type 'int' to 'byte'. An explicit conversion exists (are you missing a cast?) Each part of this statement is a byte. Why does C# want to convert the byte.MaxValue - b to an int? Shouldn't you be able to do this some how without casting? (i.e. I don't want to have to do this: byte inv = (byte) (byte.MaxValue - b);)

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  • Which language should I pick up: VB.Net or C#

    - by magius
    I'm looking to pick up either C# or VB.Net. I'd done a fair bit of VB6 programming in the past. I'm looking at getting the book, Visual Basic .NET or C#, Which to Choose? but I'm hoping that someone has read it, or used both languages and can offer advice. Should I just RTFB? Edit: Anders Sandvig raised a valid question. I'm intending to develop ActiveX applications that will be served through IE. Edit: Given that the functionality is pretty close and my favored approach to learning is to "just build it" and solve problems by looking it up on the internet, I've decided that the choice of language will be based on how easy it is to learn it. I looked around and found sites like C# Corner that supports my approach. Personal note: I wish I could also select Seb Nilsson's response as an accepted answer as well. Thanks guys for your input! Alright, then! I admit, theoretically, this topic is subjective; but a quick tally of answers seems to skew votes heavily in C#'s favor. Anyway, I'm really after experiences like what Keith's alluding to. I'm hoping he'll return to this topic and drop us a few more gems.

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  • valueOf() vs. toString() in Javascript

    - by brainjam
    In Javascript every object has a valueOf() and toString() method. I would have thought that the toString() method got invoked whenever a string conversion is called for, but apparently it is trumped by valueOf(). For example, the code var x = {toString: function() {return "foo"; }, valueOf: function() {return 42; }}; window.console.log ("x="+x); window.console.log ("x="+x.toString()); will print x=42 x=foo This strikes me as backwards .. if x were a complex number, for example, I would want valueOf() to give me its magnitude (so that zero would become special), but whenever I wanted to convert to a string I would want something like "a+bi". And I wouldn't want to have to call toString() explicitly in contexts that implied a string. Is this just the way it is?

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  • Convert Double to String without precision loss in javascript

    - by holger
    I would like to convert a floating point variable to a string without losing any precision. I.e. I would like the string to have the same information as my floating point variable contains, since I use the output for further processing (even if it means that the string will be very long and readable). To put this more clearly, I would like to have functions for cyclic conversion var dA = 323423.23423423e4; var sA = toString(dA); var dnA = toDouble(sA); and I would like dnA and dA to be equal Thanks PS: Sources on the internet usually talk about how to round strings but I have not found information on exact representation. Also I am not interested in Arbitrary Precision calculations, I just need double precision floating point arithmetic.

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  • Trouble Installing the new Android SDK

    - by Dan Monego
    I've installed the newest Android SDK using eclipse's software updates feature to hit the resource at https://dl-ssl.google.com/android/eclipse/. After installing it, it seems like the SDK is integrated into Eclipse, but when I try to create a new project with a single blank activity in it, I get the following error: [2009-06-06 11:41:24 - TestProject] no classfiles specified [2009-06-06 11:41:24 - TestProject] Conversion to Dalvik format failed with error 1 This is using eclipse version 3.4.2 running on top of Mac OS 10.5.7 on a 32 bit processor. Is this a misconfiguration on my part? Have I missed a part of the installation?

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  • OutOfMemoryException

    - by Andrew
    I have an application that is pretty memory hungry. It holds a large amount of data in some big arrays. I have recently been noticing the occasional OutOfMemoryException. These OutOfMemoryExceptions are occurring long before my application (ASP.Net) has used up the 800mb available to it. I have track the issue down to the area of code where the array is resized. The array contains a structure that is 74bytes in size. (I know that you shouldn't create struct's that are bigger than 16bytes), but this application is a port from a Vb6 application). I have tried changing the struct to a class and this appears to have fixed the problem for now. I think the reason that changing to a class solves the problem has to do with the fact that when using a struct and the array is resized, a segment of memory that is large enough to store the new array needs to be reserved (e.g. (currentArraySize + increaseBySize)*74) cannot be found. This leads to the OutOfMemoryException. This isn't the case with a class as each element of the array only needs 8bytes to store a pointer to the new object. Is my thinking correct here?

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  • Unregistering COM dll with a C# Setup Project

    - by lb
    Hi All. I've been stuck on this one for a while. I'll try explain in the simplest terms and at the best of my knowledge. I will honour any help. I've got a C# project which uses a VB6 compiled ActiveX DLL that I'm constantly updating. I compile the setup project, send it to the client and they run the setup. When building the updated setup project, I would increase the 'Version' of the setup project so it wouldn't bother with 'Another version is already installed'. What started happening after a few updates I began to notice the DLL would not be updated to the new version in the installer. The client computer had the original DLL both installed and registered. First symptom: method not found exceptions from the client C# code. This is not a shared DLL and only this application needs it. I've noticed that when uninstalling the application (through the usual procedure) the DLL is also not removed from the application folder although I would set this file's property 'Permanent' to false. The registration entries in the registry are mantained also. I do update in VS6.0 the version of the DLL (usually increase the build number) before building it. Then in VS2008, I remove it from the References, and add it again from the 'Browse tab', without re-registering it on my dev machine and adding it from the COM tab. I've thought of these options. Custom step in Setup project to regsvr32.exe /u 'hardcoded path of my dll' at uninstall (ugly) Somehow find out how the 'Isolate' property can work for me without registering Find out how to execute setup project 'Conditions' that would actually check the version of the library and to update the file accordingly at every install) Any help would be incredibly welcome.

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  • Standard Place for an Empty String Array in the JDK

    - by Simon B
    Hi is there a standard place for accessing empty array constants in the JDK 1.5. When I want to do a conversion from a String Collection (e.g. ArrayList)to a String Array I find myself using my own which is defined in my own Constants class: public static final String[] EMPTY_STRING_ARRAY = new String[0]; And then in my client code something like: String[] retVal = myStringList.toArray(Constants.EMPTY_STRING_ARRAY); return retVal; I was wondering if this is the "idiomatic" of doing it or if I'm missing something I get the impression from the brief search I did that this kind of thing is prevalent in many people's code. Any ideas, answers, comment (aside from that I shouldn't really use String Arrays) greatly appreciated, Cheers Simon

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  • Cast from Void* to TYPE* using C++ style cast: static_cast or reinterpret_cast

    - by David Relihan
    So if your converting from Void* to Type* or from Type* to Void* should you use: void func(void *p) { Params *params = static_cast<Params*>(p); } or void func(void *p) { Params *params = reinterpret_cast<Params*>(p); } To me static_cast seems the more correct but I've seen both used for the same purpose. Also, does the direction of the conversion matter. i.e. should I still use static_cast for: _beginthread(func,0,static_cast<void*>(params) I have read the other questions on C++ style casting but I'm still not sure what the correct way is for this scenario (I think it is static_cast)

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  • Convert JSON String to Java Object or HashMap

    - by Priyank
    Hi. I am writing an android app. I want to pass some data across the intents/activities and I feel that a conversion to and from JSON is probably a more optimal way at this point. I am able to convert a java hashmap to a json string successfully using JSONObject support. However i need to convert back this JSON string to a java object or a hashmap. What is the best way to go about it. Is parcelable really a change worth doing; if I have simple 5 field object? What are the other ways to transfer data between intents. Cheers

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  • Converting python objects for rpy2

    - by bgbg
    The following code is supposed to created a heatmap in rpy2 import numpy as np from rpy2.robjects import r data = np.random.random((10,10)) r.heatmap(data) However, it results in the following error Traceback (most recent call last): File "z.py", line 8, in <module> labRow=rowNames, labCol=colNames) File "C:\Python25\lib\site-packages\rpy2\robjects\__init__.py", line 418, in __call__ new_args = [conversion.py2ri(a) for a in args] File "C:\Python25\lib\site-packages\rpy2\robjects\__init__.py", line 93, in default_py2ri raise(ValueError("Nothing can be done for the type %s at the moment." %(type(o)))) ValueError: Nothing can be done for the type <type 'numpy.ndarray'> at the moment. From the documentation I learn that r.heatmap expects "a numeric matrix". How do I convert np.array to the required data type?

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  • pthread_create from non-static member function

    - by Stanislav Palatnik
    This is somewhat similiar to this : http://stackoverflow.com/questions/1151582/pthread-function-from-a-class But the function that's getting called in the end is referencing the this pointer, so it cannot be made static. void * Server::processRequest() { std::string tmp_request, outRequest; tmp_request = this->readData(); outRequest = this->parse(tmp_request); this->writeReply(outRequest); } void * LaunchMemberFunction(void * obj) { return ((Server *)obj)->processRequest(); } and then the pthread_create pthread_create(&handler[tcount], &attr, (void*)LaunchMemberFunction,(void*)&SServer); errors: SS_Twitter.cpp:819: error: invalid conversion from void* to void* ()(void) SS_Twitter.cpp:819: error: initializing argument 3 of int pthread_create(pthread_t*, const pthread_attr_t*, void* ()(void), void*)

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  • Response.Redirect in a COM+ Object Called from Classic ASP Page

    - by ajdams
    Basically we moved from IIS 5 to IIS 7 and I am trying to update some of our old COM objects to .NET by rewriting them in C#. What I am have so far is a Classic ASP page calling the COM+ object and then I am trying to do a simple redirect within the COM+ object (this is just for testing purposes, it's not what the object will do eventually). My problem/question is, why does the redirect call not work properly? Am I doing something wrong or can you not redirect within a COM+ object? All that happens is a blank white page comes up and if I check the IIS logs, I see no errors. Here is my code so far: In Classic ASP (the call to COM+) Set oBankReg = CreateObject("BVSRegistration.SignIn") oBankReg.GetBankId(bankid) Code in C# COM object: using System; using System.Web; using System.Text; using System.EnterpriseServices; using System.Collections.Generic; using System.Runtime.InteropServices; [assembly: ApplicationName("BVSRegistration")] [assembly: Description("COM+ upgrade of the BVSRegistration VB6 SignIn.cls.")] [assembly: ApplicationActivation(ActivationOption.Server)] [assembly: ApplicationAccessControl(false, AccessChecksLevel = AccessChecksLevelOption.ApplicationComponent)] namespace BVSRegistration { public class SignIn : ServicedComponent { public void GetBankId(string bankid) { HttpContext.Current.Response.Redirect("http://www.google.com"); } } } Any ideas? Thanks

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  • Alternatives to ImageMagick for PDF downsizing

    - by Craig Coston
    Having an issue with some PDF files not displaying properly in our iPad app. I have come to the conclusion that we are needing to standardize by "converting" PDF to PDF. I have successfully processed this using ImageMagick to convert the PDF to PNG (resized), and then pushing the PNG(s) back into a PDF. However, something within ImageMagick is making photos within PDFs display wrong. Same issue just converting a JPG or other graphic to PDF in ImageMagick. I solved that by taking the output of the converted ImageMagick file and converting it again using GD to PNG, then pushing it through our PDF converter. So my question is this: What other PHP workflows would work with this, other than using ImageMagick for the conversion back to PDF? We are not opposed to a paid solution, we just need something that works. Our server runs centOS.

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  • [Cocoa] NSTask string encoding problem

    - by ryyst
    Hi, In my program, I'm grep-ing via NSTask. For some reason, sometimes I would get no results (even though the code was apparently the same as the command run from the CLI which worked just fine), so I checked through my code and found, in Apple's documentation, that when adding arguments to an NSTask object, "the NSTask object converts both path and the strings in arguments to appropriate C-style strings (using fileSystemRepresentation) before passing them to the task via argv[]" (snip). The problem is that I might grep terms like "Río Gallegos". Sadly (as I checked with fileSystemRepresentation), that undergoes the conversion and turns out to be "RiÃÅo Gallegos". How can I solve this? -- Ry

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  • Experiences with "language converters"?

    - by Friedrich
    I have read a few articles mentioning converters from one language to another. I'm a bit more than skeptical about the use of such kind of tools. Does anyone know or have experiences let's say about Visual Basic to Java or vs converters? Just one example to pick http://www.tvobjects.com/products/products.html, claims to be the "world leader" or so in that aspect, However if read this: http://dev.mysql.com/tech-resources/articles/active-grid.html There the author states: "The consensus of MySQL users is that automated conversion tools for MS Access do not work. For example, tools that translate existing Access applications to Java often result in 80% complete solutions where finishing the last 20% of the work takes longer than starting from scratch." Well we know we need 80% of the time to implement the first 80% functionality and another 80% of the time for the other 20 %.... So has anyone tried such tools and found them to be worthwhile?

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  • Generate HTML To PDF Control for the .NET application

    - by Karan
    Has anyone used any open source or paid .NET Control which does the conversion job from html to pdf file? At the moment, i am using Winnovative convertor control. But it has a performance limitation during the generation of bulk pages (like more than 1000) in the pdf. The limitation comes when we use bigger images in the html content. From last 4 months i've been working on the winnovative control and found plenty of major bugs in it. For a small application and usage. winnovative is good but not for the level where application will be used by thousands of clients. Please suggest.

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  • How to improve my LDAP schema?

    - by asmaier
    Hello, I have a OpenLDAP Database and it holds some project objects that look like dn: cn=Proj1,ou=Project,ou=ua,dc=org cn: Proj1 objectClass: top objectClass: posixGroup member: 001ag member: 002ag System: ABEL System: PCx Budget: ABEL:1000000:0.3 Budget: PCx:300000:0.3 One can see that the Budget attribute is a ":"-separated string, where the first part holds the name of the system the budget is for, the second part holds some budget (which may change every month) and the last entry is a conversion factor for the budget of that system. Seeing this, I thought this is bad database design, since attribute values should always be atomic. But how can I improve that in LDAP, so that I can do a direct ldapsearch or a direct ldapmodify of the budget of System "ABEL" instead of writing a script, that will have to parse and split the ":"-separated string?

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  • ActiveRecord model with datetime stamp with timezone support attribute.

    - by jtarchie
    Rails is great that it will support timezone overall in the application with Time.zone. I need to be able to support the timezone a user selects for a record. The user will be able to select date, time, and timezone for the record and I would like all calculations to be done with respect to the user selected timezone. My question is what is the best practice to handle user selected timezones. The model is using a time_zone_select and datetime_select for two different attributes timezone and scheduled_at. When the model saves, the scheduled_at attribute gets converted to the locally defined Time.zone. When a user goes back to edit the scheduled_at attribute with the datetime_select the datetime is set to the converted Time.zone timezone and not the timezone attribute. Is there a nice way to handle to the conversion to the user selected timezone?

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  • How to apply custom BidirectionalGraph from QuickGraph to GraphLayout from Graph#?

    - by Dmitry
    Whats wrong? using QuickGraph; using GraphSharp; public class State { public string Name { get; set; } public override string ToString() { return Name; } } public class Event { public string Name; public override string ToString() { return Name; } } BidirectionalGraph<State, TaggedEdge<State, Event>> x = new BidirectionalGraph<State, TaggedEdge<State, Event>>(); GraphLayout graphLayout = new GraphLayout(); graphLayout.Graph = x; Error: Cannot implicitly convert type 'QuickGraph.BidirectionalGraph' to 'QuickGraph.IBidirectionalGraph'. An explicit conversion exists (are you missing a cast?) If I put the cast, then application gets fault error on start without any information Whats wrong?

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  • Convert varchar to numeric in Informix

    - by user302705
    Hi All I have problem while converting varchar type to Int type in Informix. Actually I dont know if the value is really varchar or not which I want to convert to INT. Its a sandbox system. As Example: I am trying to run this kind of Select telnumber from numbers n where Cast(n.telnumber AS INT) between 1234 and 9999 I got this error: "Character to numeric conversion error" If I run this query like this: Select telnumber from numbers n where n.telnumber between '1234' and '9999' it brings a resultset but not in the range that I defined. 130987 130710 130723 How can I convert telnumber to a numeric value and use it in "between" 1234 and 9999 range Thanks in advance.

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  • Django model field value preprocessing before returning

    - by Satoru.Logic
    Hi, all. I have a Note model class like this: class Note(models.Model): author = models.ForeignKey(User, related_name='notes') content = NoteContentField(max_length=256) NoteContentField is a custom sub-class of CharField that override the to_python method in purpose of doing some twitter-text-conversion processing. class NoteContentField(models.CharField): __metaclass__ = models.SubfieldBase def to_python(self, value): value = super(NoteContentField, self).to_python(value) from ..utils import linkify return mark_safe(linkify(value)) However, this doesn't work. When I save a Note object like this: note = Note(author=request.use, content=form.cleaned_data['content']) The conversed value is saved into the database, which is not what I wanna see. Would you please tell me what's wrong with this? Thanks in advance.

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