unsafe

I'm trying to compile a program on the new DNX4.6 core, but it won't compile due to: error CS0227: Unsafe code may only appear if compiling with /unsafe This is my code: [CompilerGenerated] public unsafe class GrayscaleQuantizer : PaletteQuantizer { I've looked online, and I can't get any source with the same problem as I have. I can't tick the 'Allow Unsafe Code' at the Build tab of the Project Properties, because there is no option to do so... Does anyone know a solution? You need to set "allowUnsafe": true in the build options in project.json . I wasn't smart enough to be able to figure it

I am working on a cross platform application that targets Android and iOS platforms. I am using jQuery 1.9.1, Jquery Mobile 1.3.1 and Phonegap 2.8.0. I want to send an ajax request and set the request headers "Connection" and "Keep-Alive". On Android Phones with OS greater than 4.1 (Whose default browser is Chrome) I get an error which says "Refused to set unsafe header "Connection"". I am able to send such requests on lower end devices and even on iPhones. Can Anyone Please help me out. I have to set these 2 headers in the request. Thanks in advance. Section 4.6.2 of the W3C XMLHttpRequest

I understand pointers and the rare need to use them in C# code. My question is: what is the reasoning behind having to explicitly state "unsafe" in a block of code. Additionally, why must a compiler option be changed to allow "unsafe" code? Bottom Line: What in the CLR (or language specs) makes it so we can't just use pointers whenever we want (much like C and C++) without having to type "unsafe" and change the compiler option? For clarification: I know what "unsafe" and "safe" code is. It's just a question of why must we do all the extra work (ok, not THAT much extra) just to be able to use

I want to convert a byte* to a byte[] , but I also want to have a reusable function to do this: public unsafe static T[] Create<T>(T* ptr, int length) { T[] array = new T[length]; for (int i = 0; i < length; i++) array[i] = ptr[i]; return array; } Unfortunately I get a compiler error because T might be a ".NET managed type" and we can't have pointers to those . Even more frustrating is that there is no generic type constraint which can restrict T to "unmanaged types". Is there a built-in .NET function to do this? Any ideas? The method that could match what you are trying to do is Marshal.Copy

I'm trying to publish a web application (with VS2012 Web) in which I need to run a vb script. That script currently doesn't run correctly probably because of the lack of permissions. I am currently trying to run it as a user and supply some credentials. The password I have to provide must be in a System.Security.SecureString which needs a char* to be created. When I run my app in debug everything works fine and as expected. But when comes the time to publish the app to the server, it says : 1>C:\SVN\...\Default.aspx.cs(108,21,108,27): error CS0227: Unsafe code may only appear if compiling with

I just made a Swap routine in C# like this: static void Swap(ref int x, ref int y) { int temp = x; x = y; y = temp; } It does the same thing that this C++ code does: void swap(int *d1, int *d2) { int temp=*d1; *d1=*d2; *d2=temp; } So are the ref and out keywords like pointers for C# without using unsafe code? They're more limited. You can say ++ on a pointer, but not on a ref or out . EDIT Some confusion in the comments, so to be absolutely clear: the point here is to compare with the capabilities of pointers. You can't perform the same operation as ptr++ on a ref / out , i.e. make it address

Read this question today about safe and unsafe code I then read about it in MSDN but I still don't understand it. Why would you want to use pointers in C#? Is this purely for speed? There are three reasons to use unsafe code: APIs (as noted by John) Getting actual memory address of data (e.g. access memory-mapped hardware) Most efficient way to access and modify data (time-critical performance requirements) Sometimes you'll need pointers to interface your C# to the underlying operating system or other native code. You're strongly discouraged from doing so, as it is "unsafe" (natch). There will

I'm trying to get the field types of an unsafe struct using some fixed fields. The fixed fields FieldType do not return the actual type. [StructLayout(LayoutKind.Sequential, Pack = 1)] public unsafe struct MyStruct { public UInt32 Field1; public fixed sbyte Field2[10]; public UInt64 Field3; } void Test() { var theStruct = new MyStruct(); string output = ""; foreach (FieldInfo fi in theStruct.GetType().GetFields(BindingFlags.Public | BindingFlags.Instance)) { output += fi.Name + ": " + fi.FieldType.ToString() + "\r\n"; } } Output: Field1: System.UInt32 Field2: TestProjectNS.MyStruct+<Field2>e_