How to specify the type of (delegate) pointers without modified the .h file

[where where (wherewhere)]

In jni.h, it has some structs with function pointer members:

struct JNIInvokeInterface_ {
    void *reserved0;
    void *reserved1;
    void *reserved2;

    jint (JNICALL *DestroyJavaVM)(JavaVM *vm);
    jint (JNICALL *AttachCurrentThread)(JavaVM *vm, void **penv, void *args);
    jint (JNICALL *DetachCurrentThread)(JavaVM *vm);
    jint (JNICALL *GetEnv)(JavaVM *vm, void **penv, jint version);
    jint (JNICALL *AttachCurrentThreadAsDaemon)(JavaVM *vm, void **penv, void *args);
};

When use WinmdGenerator to generate it, it become:

public unsafe partial struct JNIInvokeInterface_
{
    public void* reserved0;
    public void* reserved1;
    public void* reserved2;

    [NativeTypeName("jint (*)(JavaVM *) __attribute__((stdcall))")]
    public IntPtr DestroyJavaVM;
    [NativeTypeName("jint (*)(JavaVM *, void **, void *) __attribute__((stdcall))")]
    public IntPtr AttachCurrentThread;
    [NativeTypeName("jint (*)(JavaVM *) __attribute__((stdcall))")]
    public IntPtr DetachCurrentThread;
    [NativeTypeName("jint (*)(JavaVM *, void **, jint) __attribute__((stdcall))")]
    public IntPtr GetEnv;
    [NativeTypeName("jint (*)(JavaVM *, void **, void *) __attribute__((stdcall))")]
    public IntPtr AttachCurrentThreadAsDaemon;
}

And then when it becomes to winmd, the NativeTypeName is missing:

public struct JNIInvokeInterface_
{
    public unsafe void* reserved0;
    public unsafe void* reserved1;
    public unsafe void* reserved2;

    public IntPtr DestroyJavaVM;
    public IntPtr AttachCurrentThread;
    public IntPtr DetachCurrentThread;
    public IntPtr GetEnv;
    public IntPtr AttachCurrentThreadAsDaemon;
}

Which generated by C#/Win32 is:

[global::System.CodeDom.Compiler.GeneratedCode("Microsoft.Windows.CsWin32", "0.3.264+4d6898735f.RR")]
internal partial struct JNIInvokeInterface
{
    internal unsafe void* reserved0;
    internal unsafe void* reserved1;
    internal unsafe void* reserved2;

    internal nint DestroyJavaVM;
    internal nint AttachCurrentThread;
    internal nint DetachCurrentThread;
    internal nint GetEnv;
    internal nint AttachCurrentThreadAsDaemon;
}

The type is only has nint.

I see the emums has enums.json to specify numbers to the enums, such as:

{
  "$schema": "https://github.com/microsoft/win32metadata/raw/main/generation/WinSDK/enums.schema.json",
  "items": [
    {
      "namespace": "Java.Runtime.Native",
      "name": "JNI_ERROR",
      "autoPopulate": {
        "filter": "JNI_OK|JNI_E",
        "header": "jni.h"
      },
      "uses": [
        {
          "method": "JNI_GetDefaultJavaVMInitArgs",
          "parameter": "return"
        },
        {
          "method": "JNI_CreateJavaVM",
          "parameter": "return"
        },
        {
          "method": "JNI_GetCreatedJavaVMs",
          "parameter": "return"
        }
      ]
    }
  ]
}

Is that other types have these settings?

By the way, it will be better if the void* can be specified types like enums. Such as

_JNI_IMPORT_OR_EXPORT_ jint JNICALL
JNI_CreateJavaVM(JavaVM **pvm, void **penv, void *args);

which void** should be JNIEnv**.

[where where (wherewhere)]

Find it. Use emitter.settings.rsp can change the member of types.

--memberRemap
JavaVMInitArgs::options=[NativeArrayInfo(CountFieldName="nOptions")]
JNI_GetDefaultJavaVMInitArgs::args=JavaVMInitArgs*
JNI_CreateJavaVM::pvm=[Out]
JNI_CreateJavaVM::penv=[Out]JNIEnv**
JNI_CreateJavaVM::args=[In]JavaVMInitArgs*
#JNI_GetCreatedJavaVMs::param0=[NativeArrayInfo(CountParamIndex=1)]
JNI_GetCreatedJavaVMs::param2=[Out]

But the anonymous function pointers need to define one by one...

#include "jni.h"

// JNIInvokeInterface

typedef jint(JNICALL* InputJavaVM)(JavaVM* vm);
typedef jint(JNICALL* InputJavaVMWithArgs)(JavaVM* vm, JNIEnv* penv, JavaVMAttachArgs* args);
typedef jint(JNICALL* InputJavaVMWithVersion)(JavaVM* vm, JNIEnv* penv, jint version);

InputJavaVM::return=JNI_ERROR
InputJavaVM::vm=[In]
InputJavaVMWithArgs::return=JNI_ERROR
InputJavaVMWithArgs::vm=[In]
InputJavaVMWithArgs::penv=[Out]
InputJavaVMWithArgs::args=[Optional][In]
InputJavaVMWithVersion::vm=[In]
InputJavaVMWithVersion::penv=[Out]
InputJavaVMWithVersion::version=JNI_VERSION

JNIInvokeInterface::DestroyJavaVM=InputJavaVM
JNIInvokeInterface::AttachCurrentThread=InputJavaVMWithArgs
JNIInvokeInterface::DetachCurrentThread=InputJavaVM
JNIInvokeInterface::GetEnv=InputJavaVMWithVersion
JNIInvokeInterface::AttachCurrentThreadAsDaemon=InputJavaVMWithArgs