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Swift – Checking unmanaged address book single value property for nil

If I want the values associated with various properties, I use the following syntax: let first = ABRecordCopyValue(person, kABPersonFirstNameProperty)?.takeRetainedValue() as? String let last = ABRecordCopyValue(person, kABPersonLastNameProperty)?.takeRetainedValue() as? String Or you can use optional binding: if let first = ABRecordCopyValue(person, kABPersonFirstNameProperty)?.takeRetainedValue() as? String { // use `first` here } if let last = ABRecordCopyValue(person, kABPersonLastNameProperty)?.takeRetainedValue() as? … Read more

Difference between managed and unmanaged in-app product android?

UnManaged could be something like “Buy 50 points” The 50 points would then be added to your account and you would store this on your accounts server, therefore the Android Market no longer needs to know that you purchased this product i.e. it will not remember your purchase and you can purchase it multiple times. … Read more

How do I add a reference to an unmanaged C++ project called by a C# project?

You cannot add a reference to an unmanaged DLL. Instead, you should make a post-build task to copy the file. Alternatively, you can add a link to the unmanaged DLL as a file in the C# project, and set Build Action to None and Copy to Output Directory to Copy If Newer.

Is there a tool that generates P/Invoke signatures for arbitrary unmanaged DLL?

Google quickly found http://www.pinvoker.com (Wayback) (Compatiblity listed as VS2005, 2008, and 2010; it doesn’t seem to have been updated to work with newer versions) Microsoft’s C++/CLI compiler can also do this, if you use /clr:safe and #include the header file, it will generate p/invoke code which you can extract with e.g. ILSpy (free) or Red … Read more

How to call managed code from unmanaged code?

Look at this solution: https://sites.google.com/site/robertgiesecke/Home/uploads/unmanagedexports The solution allows to call C# function from C by decorating your function with [DllExport] attribute (opposite of P/Invoke DllImport). Exmaple: C# code class Test { [DllExport(“add”, CallingConvention = CallingConvention.StdCall)] public static int Add(int left, int right) { return left + right; } } C code: extern “C” int add(int, … Read more

Is it possible to catch an access violation exception in .NET?

You shouldn’t. An access violation is a serious problem: it is an unexpected attempt to write to (or read from) an invalid memory address. As John already clarified, the unmanaged DLL might already have corrupted the process memory before the access violation has been raised. This can have unpredicted effects on any part of the … Read more

What is meant by “managed” vs “unmanaged” resources in .NET?

The term “unmanaged resource” is usually used to describe something not directly under the control of the garbage collector. For example, if you open a connection to a database server this will use resources on the server (for maintaining the connection) and possibly other non-.net resources on the client machine, if the provider isn’t written … Read more

C# “Unmanaged Exports” [closed]

I would recommend you do this the documented way instead of relying on a undocumented hack from an author who doesn’t provide support. Let’s do it with an example: namespace Publics { public class Class1 { public static void Run() { // Stuff… } } } Add a new C++/CLI class library to your project. … Read more

A call to PInvoke function ‘[…]’ has unbalanced the stack

I had a _cdecl c++ dll that I called without any trouble from Visual Studio 2008, and then the identical code in Visual Studio 2010 would not work. I got the same PInvoke … has unbalanced the stack error as well. The solution for me was to specify the calling convention in the DllImport(…) attribute: … Read more

Howto implement callback interface from unmanaged DLL to .net app?

You don’t need to use Marshal.GetFunctionPointerForDelegate(), the P/Invoke marshaller does it automatically. You’ll need to declare a delegate on the C# side whose signature is compatible with the function pointer declaration on the C++ side. For example: using System; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; class UnManagedInterop { private delegate int Callback(string text); private Callback mInstance; // … Read more