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  • Succinct introduction to C++/CLI for C#/Haskell/F#/JS/C++/... programmer

    - by Henrik
    Hello everybody, I'm trying to write integrations with the operating system and with things like active directory and Ocropus. I know a bunch of programming languages, including those listed in the title. I'm trying to learn exactly how C++/CLI works, but can't find succinct, exact and accurate descriptions online from the searching that I have done. So I ask here. Could you tell me the pitfalls and features of C++/CLI? Assume I know all of C# and start from there. I'm not an expert in C++, so some of my questions' answers might be "just like C++", but could say that I am at C#. I would like to know things like: Converting C++ pointers to CLI pointers, Any differences in passing by value/doubly indirect pointers/CLI pointers from C#/C++ and what is 'recommended'. How do gcnew, __gc, __nogc work with Polymorphism Structs Inner classes Interfaces The "fixed" keyword; does that exist? Compiling DLLs loaded into the kernel with C++/CLI possible? Loaded as device drivers? Invoked by the kernel? What does this mean anyway (i.e. to load something into the kernel exactly; how do I know if it is?)? L"my string" versus "my string"? wchar_t? How many types of chars are there? Are we safe in treating chars as uint32s or what should one treat them as to guarantee language indifference in code? Finalizers (~ClassName() {}) are discouraged in C# because there are no garantuees they will run deterministically, but since in C++ I have to use "delete" or use copy-c'tors as to stack allocate memory, what are the recommendations between C#/C++ interactions? What are the pitfalls when using reflection in C++/CLI? How well does C++/CLI work with the IDisposable pattern and with SafeHandle, SafeHandleZeroOrMinusOneIsInvalid? I've read briefly about asynchronous exceptions when doing DMA-operations, what are these? Are there limitations you impose upon yourself when using C++ with CLI integration rather than just doing plain C++? Attributes in C++ similar to Attributes in C#? Can I use the full meta-programming patterns available in C++ through templates now and still have it compile like ordinary C++? Have you tried writing C++/CLI with boost? What are the optimal ways of interfacing the boost library with C++/CLI; can you give me an example of passing a lambda expression to an iterator/foldr function? What is the preferred way of exception handling? Can C++/CLI catch managed exceptions now? How well does dynamic IL generation work with C++/CLI? Does it run on Mono? Any other things I ought to know about?

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  • Succinct introduction to C++/CLI for C#/Haskell/F#/JS/C++/... programmer

    - by Henrik
    Hello everybody, I'm trying to write integrations with the operating system and with things like active directory and Ocropus. I know a bunch of programming languages, including those listed in the title. I'm trying to learn exactly how C++/CLI works, but can't find succinct, exact and accurate descriptions online from the searching that I have done. So I ask here. Could you tell me the pitfalls and features of C++/CLI? Assume I know all of C# and start from there. I'm not an expert in C++, so some of my questions' answers might be "just like C++", but could say that I am at C#. I would like to know things like: Converting C++ pointers to CLI pointers, Any differences in passing by value/doubly indirect pointers/CLI pointers from C#/C++ and what is 'recommended'. How do gcnew, __gc, __nogc work with Polymorphism Structs Inner classes Interfaces The "fixed" keyword; does that exist? Compiling DLLs loaded into the kernel with C++/CLI possible? Loaded as device drivers? Invoked by the kernel? What does this mean anyway (i.e. to load something into the kernel exactly; how do I know if it is?)? L"my string" versus "my string"? wchar_t? How many types of chars are there? Are we safe in treating chars as uint32s or what should one treat them as to guarantee language indifference in code? Finalizers (~ClassName() {}) are discouraged in C# because there are no garantuees they will run deterministically, but since in C++ I have to use "delete" or use copy-c'tors as to stack allocate memory, what are the recommendations between C#/C++ interactions? What are the pitfalls when using reflection in C++/CLI? How well does C++/CLI work with the IDisposable pattern and with SafeHandle, SafeHandleZeroOrMinusOneIsInvalid? I've read briefly about asynchronous exceptions when doing DMA-operations, what are these? Are there limitations you impose upon yourself when using C++ with CLI integration rather than just doing plain C++? Attributes in C++ similar to Attributes in C#? Can I use the full meta-programming patterns available in C++ through templates now and still have it compile like ordinary C++? Have you tried writing C++/CLI with boost? What are the optimal ways of interfacing the boost library with C++/CLI; can you give me an example of passing a lambda expression to an iterator/foldr function? What is the preferred way of exception handling? Can C++/CLI catch managed exceptions now? How well does dynamic IL generation work with C++/CLI? Does it run on Mono? Any other things I ought to know about?

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  • Byte = 8bits, but why doesn't BitConverter think so

    - by Paul Farry
    Given the following information Public Enum Request As Byte None = 0 Identity = 1 License = 2 End Enum Protected mType As Communication.Request mType = Communication.Request.Identity Debug.Print (BitConverter.GetBytes(mType).Length.tostring) 2 Why does bitconverter report that mType is a length of 2. I would have thought that passing a Byte into BitConverter.GetBytes would just return the Byte. I mean it's no big deal because it's only sending a very small block of data across a TCP Socket, but I'm just intrigued why it thinks it's 2 bytes.

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  • Convert HTML to PDF in .NET

    - by SandHurst
    I want to generate PDF by passing HTML contents to a function. I have made use of ItextSharp for this but it does not perform well when it encounters Table and the layout just gets messy. Is there any free library available ?

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  • xml parsing in adobe alchemy

    - by cbs
    hello can you prvide an example how to parse xml file in adobe alchemy. im trying to work on expat, however i got no luck on passing of bytearrays to and from the c code. do i need to pass the byte array of file to the alchemy, or is it enough to pass the filename. thanks. cbs

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  • C stack/scope, variable's lifetime after functions ends

    - by Ranking Stackingblocks
    void someFunc() { int stackInt = 4; someOtherFunc(&stackInt); } Is it the case that stackInt's address space could be reallocated after someFunc ends, making it unsafe to assume that the value passed to someOtherFunc represents the stackInt variable with value 4 that was passed to it? In other words, should I avoid passing stack variables around by address and expecting them to still be alive after the function they were initialised in has ended?

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  • Zend Form: How to pass parameters into the constructor?

    - by Andrew
    I'm trying to test my form. It will be constructing other objects, so I need a way to mock them. I tried passing them into the constructor... class Form_Event extends Zend_Form { public function __construct($options = null, $regionMapper = null) { $this->_regionMapper = $regionMapper; parent::__construct($options); } ...but I get an exception: Zend_Form_Exception: Only form elements and groups may be overloaded; variable of type "Mock_Model_RegionMapper_b19e528a" provided What am I doing wrong?

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  • Uploading file from file object with PyCurl

    - by Tom
    I'm attempting to upload a file like this: import pycurl c = pycurl.Curl() values = [ ("name", "tom"), ("image", (pycurl.FORM_FILE, "tom.png")) ] c.setopt(c.URL, "http://upload.com/submit") c.setopt(c.HTTPPOST, values) c.perform() c.close() This works fine. However, this only works if the file is local. If I was to fetch the image such that: import urllib2 resp = urllib2.urlopen("http://upload.com/people/tom.png") How would I pass resp.fp as a file object instead of writing it to a file and passing the filename? Is this possible?

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  • Deploying XBAP as an ActiveX

    - by Kaveh Shahbazian
    How can I deploy a XBAP to a client machine as an ActiveX (Which I can instantiate and use from JavaScript, passing parameters to it, getting parameters from it, etc)? This is part of an ASP.NET site, and will be in full trusted mode (I have solved that part, actually I have implemented a test XBAP that can edit a text file on local hard drive of a client machine). Thanks

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  • Is it a bad practice to pass "this" as an argument?

    - by Anna Lear
    I'm currently tempted to write the following: public class Class1() { public Class1() { MyProperty = new Class2(this); } public Class2 MyProperty { get; private set; } } public class Class2() { public Class2(Class1 class1) { ParentClass1 = class1; } public Class1 ParentClass1 { get; set; } } Is passing "this" as an argument a sign of a design problem? What would be a better approach?

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  • XmlDataProvider authentication Http issue

    - by Allen Ho
    Hi, I have an XMLDataProvider IsAsynchronous="True" x:Key="xmlData" Source="http://192.168.15.90/text.xml"/ The only problem is the Source requires authtication. I can get around this but using a HttpWebRequest in which I can pass in NetworkCredentials, but I was just wondering if there was a simpler way of passing in credentials to the XMLDataProvider

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  • HTTP basic authentication via URL doesn't work with Firefox?

    - by Peter
    Normally you can login to sites that require HTTP basic authentication by passing the username and password in the URL, e.g.: http://myusername:[email protected]/mypath On my Linux machine, I could access this website without problems with my Konqueror browser as well as with my Opera browser. But with Firefox it doesn't work? It always displays the "Authentication Required" dialog window? Any ideas why it would work with the other browsers but not with Firefox? Peter

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  • what does macosx-version-min imply?

    - by Quincy
    When I pass compiler flag "-mmacosx-version-min=10.5", what does it mean? I think it implies the result binary is x86, not ppc, but is it 32 bits or 64 bits? I'm compiling on snow leopard, so default output binary is 64 bits. I'm not passing -universal, it's not 32bit-64bit universal binary, I think.

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  • Parametrized get request in Ruby?

    - by Horace Loeb
    How do I make an HTTP GET request with parameters in Ruby? It's easy to do when you're POSTing: require 'net/http' require 'uri' HTTP.post_form URI.parse('http://www.example.com/search.cgi'), { "q" => "ruby", "max" => "50" } But I see now way of passing GET parameters as a hash using net/http.

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  • When to call release on NSURLConnection delegate?

    - by Kieran H
    Hi, When passing a delegate to the a NSUrlConnection object like so: [[NSURLConnection alloc] initWithRequest:request delegate:handler]; when should you call release on the delegate? Should it be in connectionDidFinishLoading? If so, I keep getting exec_bad_access. I'm seeing that my delegates are leaking through instruments. Thanks

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  • Does a custom DataGridView Cell have to have a parameterless constructor?

    - by clawson
    I want to slight variation of the custom cell code example from the MS website How to: Customize Cells and Columns in the Windows Forms DataGridView Control by Extending Their Behavior and Appearance by passing an argument to the custom cell constructor. Public Sub New(ByVal a As Object) End Sub but then when I run the code it throws and exception MissingMethodException occured No parameterless constructor defined for this object. Does this mean that custom cells must have a parameterless constructor? Thanks.

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  • Sinatra / Rack fails with non-ascii characters in url

    - by Piotr Zolnierek
    I am getting Encoding::UndefinedConversionError at /find/Wroclaw "\xC5" from ASCII-8BIT to UTF-8 For some mysterious reason sinatra is passing the string as ASCII instead of UTF-8 as it should. I have found some kind of ugly workaround... I don't know why Rack assumes the encoding is ASCII-8BIT ... anyway, a way is to use string.force_encoding("UTF-8")... but doing this for all params is tedious

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  • What is a .NET app domain?

    - by Luke
    In particular, what are the implications of running code in two different app domains? How is data normally passed across the app domain boundary? Is it the same as passing data across the process boundary? I'm curious to know more about this abstraction and what it is useful for. EDIT: Good existing coverage of AppDomains in general at http://stackoverflow.com/questions/622516/i-dont-understand-appdomains

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  • Django template call function

    - by cleg
    I'm passing to Django's template a function, which returns me some records. I want to call this function and iterate over it's result. {% for item in my_func(10) %} That doesn't work. I've tried to set fuction's return value to a variable and iterate over variable, but there seems to be no way to set variable in Django template. Is there any normal way to do it?

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