P/Invoke
⚠ NOTICE: Check out CsWin32: A new, preferred approach for Win32 p/invokes now exists for C# developers.
This repo is no longer maintained.
A collection of libraries intended to contain all P/Invoke method signatures for popular operating systems.
Think of it as https://pinvoke.net, but proven to compile and work properly, and often
with sample usage in the form of unit tests.
A unique C# project wraps each native library.
The C# project may multi-target in order to support many versions of .NET Framework, .NET Core and .NET Standard.
Win32 APIs for all Windows versions are welcome.
Special Windows Store targeted assemblies omit p/invoke signatures to banned APIs so your Store apps can depend on these libraries without getting rejected by the Store certification process.
This project is supported by the .NET Foundation.
Usage
Install the NuGet package(s) for the DLLs you want to P/Invoke into.
For example, if you want to P/Invoke into Win32’s BCrypt.dll, install this package:
Install-Package PInvoke.BCrypt
Then import the following namespaces, as demonstrated below (if using C# 6):
using PInvoke;
using static PInvoke.BCrypt; // Supported in C# 6 (VS2015) and later.
This will allow you to conveniently call these methods directly by method name:
var error = BCryptOpenAlgorithm(AlgorithmIdentifiers.BCRYPT_SHA256_ALGORITHM); // C# 6 syntax
var error = BCrypt.BCryptOpenAlgorithm(BCrypt.AlgorithmIdentifiers.BCRYPT_SHA256_ALGORITHM); // C# 5 syntax
Sometimes a PInvoke method may have multiple overloads. For example every method that accepts
struct* parameters has an overload that accepts IntPtr in its place. In other cases there
may be overloads that accept struct* and struct?. In some of these cases that can lead to
compiler errors if you pass in null because both struct* and struct? overloads can match.
To resolve the issue, add a cast to your null: (struct?)null to resolve the ambiguity.
What if I need custom uint value not provided in enum?
Cast any uint to specific enum type and pass as parameter.
Design goals
Provide a slightly higher than lowest level API for P/Invoke signatures.
For example, instead of IntPtr parameters and uint flags, you’ll see SafeHandle-derived
types as parameters and flags enum types. API documentation will be provided via XML doc comments
for easy reading with Intellisense, along with links to the describing pages on MSDN
or elsewhere as applicable.
In some cases we offer several overloads of a given native method to offer native pointer and
IntPtr access. We encourage folks to try writing C# unsafe code before using IntPtr because
it (ironically) can often be easier to write correct and efficient code using native pointers than
all the casting and Marshal call overhead that IntPtr requires.
Note that when a method’s only use of a native pointer is its return type, the IntPtr returning
variant must be given a different method name by CLR overloading rules, so look for the same method
but with an _IntPtr suffix.
Distribution
This library should be available on NuGet for easy consumption by your projects.
You may also copy and paste the P/Invoke signatures you need directly into your projects if desired.
Packages:
Check out the P/Invoke coverage we have for each library.
If you need a P/Invoke that is in our source code but not yet released to nuget.org, you can consume the packages directly from our CI feed by adding this package source to your nuget.config file
<add key="PInvoke" value="https://pkgs.dev.azure.com/andrewarnott/OSS/_packaging/PublicCI/nuget/v3/index.json" />
Contribution
Please consider contributing more P/Invoke method signatures to this project.
Once you contribute, you can immediately consume your additions without waiting for another
public release of the library.
This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community.
For more information see the .NET Foundation Code of Conduct.
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