unsafe

This question already has an answer here: Marshal an array of strings from C# to C code using p/invoke 3 answers C# call C++ DLL passing pointer-to-pointer argument 3 answers I need to pass an argument to an unsafe DllImported function in the form of: [DllImport("third_party.dll")] private static extern unsafe int start(int argc, char** argv); I'm assuming it's an array of strings. However when I try to do the following, I get 'Cannot convert from string[] to char**' error. How do I go about getting this to work? Thanks. string[] argv = new string[] { }; start(0, argv); EDIT 1: The question

What are the limitations of unsafe code, in C#? For example, can I do virtually arbitrary pointer casts and arithmetic as if I were using C or C++? codekaizen Yes. All bets are off when unsafe is in play. This is the idea behind "unsafe" - that the "safety" of verifiable types is removed, and you can cast from a pointer of one type to a pointer of another type without the runtime keeping you from shooting yourself in the foot , if you so desire - much like C or C++. Here's an example of using different pointer types in C#: fixed (Byte* dstBytes = &currentImage[0]) { var dstBuffer = (Int64*

Let's say I want to have a value type of 7 bytes (or 3 or 777). I can define it like that: public struct Buffer71 { public byte b0; public byte b1; public byte b2; public byte b3; public byte b4; public byte b5; public byte b6; } A simpler way to define it is using a fixed buffer public struct Buffer72 { public unsafe fixed byte bs[7]; } Of course the second definition is simpler. The problem lies with the unsafe keyword that must be provided for fixed buffers. I understand that this is implemented using pointers and hence unsafe. My question is why does it have to be unsafe? Why can't C#

I got this error when building a sample visual C++ project. First I downloaded 3 sample projects, all solve the same problem, print out all the prime numbers less than N (you may know these sample projects ?). I built the pure-C project without any problem. But when I tried to build the assembly-based project one, I got this error. Thank you. Try to disable SAFESEH. From spec: /SAFESEH was specified, but a module was not compatible with the safe exception handling feature. In Visual Studio 2012 Express Edition: Right-click on your project -> Properties -> Configuration Properties -> Linker ->

1. sun.misc.Unsafe包 Unsafe类在jdk 源码的多个类中用到，这个类的提供了一些绕开JVM的更底层功能，基于它的实现可以提高效率。但是，它是一把双刃剑：正如它的名字所预示的那样，它是Unsafe的，它所分配的内存需要手动free（不被GC回收）。Unsafe类，提供了JNI某些功能的简单替代：确保高效性的同时，使事情变得更简单。 这篇文章主要是以下文章的整理、翻译。 http://mishadoff.com/blog/java-magic-part-4-sun-dot-misc-dot-unsafe/ 1. Unsafe API的大部分方法都是native实现，它由105个方法组成，主要包括以下几类： （1）Info相关。主要返回某些低级别的内存信息：addressSize(), pageSize() （2）Objects相关。主要提供Object和它的域操纵方法：allocateInstance(),objectFieldOffset() （3）Class相关。主要提供Class和它的静态域操纵方法：staticFieldOffset(),defineClass(),defineAnonymousClass(),ensureClassInitialized() （4）Arrays相关。数组操纵方法：arrayBaseOffset()