RSCG – System.Runtime.InteropServices

RSCG – System.Runtime.InteropServices
 
 

Generate PInvoke calls

This is how you can use System.Runtime.InteropServices .

The code that you start with is

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
		<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
	</PropertyGroup>
</Project>

The code that you will use is

WriteLine(MessageBoxW(IntPtr.Zero,"asd","asd",1));
//RSCG
WriteLine(MessageBoxW_LI(IntPtr.Zero,"asd","asd",1));

partial class DemoImport
{
    [DllImport("user32.dll",EntryPoint = "MessageBoxW",CharSet = CharSet.Unicode,SetLastError = true)]

    internal static extern int MessageBoxW(IntPtr hWnd,string lpText,string lpCaption,uint uType);


    [LibraryImport("user32.dll",EntryPoint = "MessageBoxW",SetLastError = true,
StringMarshalling = StringMarshalling.Utf16)]

    internal static partial int MessageBoxW_LI(IntPtr hWnd,string lpText,string lpCaption,uint uType);
}

global using static System.Console;
global using static DemoImport;
global using System.Runtime.InteropServices;

The code that is generated is

// <auto-generated/>
unsafe partial class DemoImport
{
    [System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Interop.LibraryImportGenerator","7.0.8.17405")]
    [System.Runtime.CompilerServices.SkipLocalsInitAttribute]
    internal static partial int MessageBoxW_LI(nint hWnd,string lpText,string lpCaption,uint uType)
    {
        int __lastError;
        int __retVal;
        // Pin - Pin data in preparation for calling the P/Invoke.
        fixed (void* __lpText_native = &global::System.Runtime.InteropServices.Marshalling.Utf16StringMarshaller.GetPinnableReference(lpText))
        fixed (void* __lpCaption_native = &global::System.Runtime.InteropServices.Marshalling.Utf16StringMarshaller.GetPinnableReference(lpCaption))
        {
            System.Runtime.InteropServices.Marshal.SetLastSystemError(0);
            __retVal = __PInvoke(hWnd,(ushort*)__lpText_native,(ushort*)__lpCaption_native,uType);
            __lastError = System.Runtime.InteropServices.Marshal.GetLastSystemError();
        }

        System.Runtime.InteropServices.Marshal.SetLastPInvokeError(__lastError);
        return __retVal;
        // Local P/Invoke
        [System.Runtime.InteropServices.DllImportAttribute("user32.dll",EntryPoint = "MessageBoxW",ExactSpelling = true)]
        static extern unsafe int __PInvoke(nint hWnd,ushort* lpText,ushort* lpCaption,uint uType);
    }
}

Code and pdf at

https://ignatandrei.github.io/RSCG_Examples/v2/docs/System.Runtime.InteropServices