Latest blog posts for tag ".NET"

.NET is an open source platform by Microsoft for building desktop, web, and mobile applications that can run natively on any operating system.

LegacyWrapper 2.1 is out!

20.08.2017 | Programming | .NET C# Legacy Wrapper

Today, I released version 2.1 of my NuGet package LegacyWrapper. It comes with a major enhancement regarding the cross-architecture loading of DLLs: It is now possible to load 64bit DLLs from a 32bit process:

1using (var client = new WrapperClient(TestDllPath, TargetArchitecture.Amd64))
3    result = (int)client.Invoke<TestStdCallDelegate>("TestStdCall", new object[] { input });

As the second constructor parameter is optional and defaults to X86, the new release should be fully backwards compatible.

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Invoking an unmanaged 32bit library out of a 64bit process

28.09.2015 | Programming | .NET C# Legacy Wrapper

When loading unmanaged / native libraries from managed .NET code, the normal way is to use the “Platform Invoke (P/Invoke)” mechanism.

1[DllImport("shell32.dll", CallingConvention = CallingConvention.Winapi)]
2static extern int DllGetVersion(ref DLLVERSIONINFO pdvi);

The problem

P/Invoke has an annoying limitation: You can not load an x86 (32bit) library into a 64bit process and vice versa. This is especially problematic when your application is compiled with the “AnyCPU”-flag - which lets the .NET runtime decide which architecture to use at runtime - and there is only one 32bit version of a specific DLL. If recompiling the library against a different architecture is not an option, you have to find another solution.

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