A Rust library for hosting the dotnet core runtime.
It utilizes the dotnet core hosting API to load and execute managed code from withing the current process.
The example below will setup the runtime, load Test.dll and run its Main method:
rust
let hostfxr = nethost::load_hostfxr()?;
let context = hostfxr.initialize_for_dotnet_command_line(pdcstr!("Test.dll")).unwrap();
let result = context.run_app();
The full example can be found in examples/run-app.
A function pointer to a managed method can be aquired using an AssemblyDelegateLoader.
The default method signature is defined as follows:
csharp
public delegate int ComponentEntryPoint(IntPtr args, int sizeBytes);
A method with the default signature (see code below) can be loaded using AssemblyDelegateLoader::get_function_pointer_with_default_signature.
C# ```cs using System;
namespace Test { public static class Program { public static int Hello(IntPtr args, int sizeBytes) { Console.WriteLine("Hello from C#!"); return 42; } } } ```
Rust
rust
let hostfxr = nethost::load_hostfxr().unwrap();
let context =
hostfxr.initialize_for_runtime_config(pdcstr!("Test.runtimeconfig.json")).unwrap();
let fn_loader =
context.get_delegate_loader_for_assembly(pdcstr!("Test.dll")).unwrap();
let hello = fn_loader.get_function_pointer_with_default_signature(
pdcstr!("Test.Program, Test"),
pdcstr!("Hello"),
).unwrap();
let result = unsafe { hello(std::ptr::null(), 0) };
A function pointer to a method annotated with UnmanagedCallersOnly can be loaded without specifying its signature (as these methods cannot be overloaded).
C# ```cs using System; using System.Runtime.InteropServices;
namespace Test { public static class Program { [UnmanagedCallersOnly] public static void UnmanagedHello() { Console.WriteLine("Hello from C#!"); } } } ```
Rust
rust
let hostfxr = nethost::load_hostfxr().unwrap();
let context =
hostfxr.initialize_for_runtime_config(pdcstr!("Test.runtimeconfig.json")).unwrap();
let fn_loader =
context.get_delegate_loader_for_assembly(pdcstr!("Test.dll")).unwrap();
let hello = fn_loader.get_function_pointer_with_default_signature(
pdcstr!("Test.Program, Test"),
pdcstr!("UnmanagedHello"),
).unwrap();
let hello: unsafe extern "system" fn() = unsafe { std::mem::transmute(hello) };
let result = unsafe { hello() };
Another option is to define a custom delegate type and passing its assembly qualified name to [AssemblyDelegateLoader::get_function_pointer](https://docs.rs/netcorehost/*/netcorehost/hostfxr/struct.AssemblyDelegateLoader.html#method.get_function_pointer).
C# ```cs using System;
namespace Test { public static class Program { public delegate void CustomHelloFunc();
public static void CustomHello() {
Console.WriteLine("Hello from C#!");
}
}
} ```
Rust
rust
let hostfxr = nethost::load_hostfxr().unwrap();
let context =
hostfxr.initialize_for_runtime_config(pdcstr!("Test.runtimeconfig.json")).unwrap();
let fn_loader =
context.get_delegate_loader_for_assembly(pdcstr!("Test.dll")).unwrap();
let hello = fn_loader.get_function_pointer(
pdcstr!("Test.Program, Test"),
pdcstr!("UnmanagedHello"),
pdcstr!("Test.Program+CustomHelloFunc, Test")
).unwrap();
let hello: unsafe extern "system" fn() = unsafe { std::mem::transmute(hello) };
let result = unsafe { hello() };
The full examples can be found in examples/call-managed-function.
Examples for passing non-primitive parameters can be found in examples/passing-parameters.
Licensed under the MIT license (LICENSE or http://opensource.org/licenses/MIT)