Jna，指针已经映射到代理接口
我正在尝试做openvr java绑定的kotlin端口 ，并将其更新到1.0.3
我已经着手编写IVRSystem结构/类
我手动编写了所有的方法，以确保Intellij中的自动翻译器不会有任何错误
我摆脱了来自getFieldOrder()不同字段的所有错误，但是现在仍然出现错误：
Exception in thread "main" java.lang.IllegalStateException: Pointer native@0xffffffff already mapped to Proxy interface to native function@0xffffffff (IVRSystem$GetEyeToHeadTransform_callback). Native code may be re-using a default function pointer, in which case you may need to use a common Callback class wherever the function pointer is reused. at com.sun.jna.CallbackReference.getCallback(CallbackReference.java:124) at com.sun.jna.CallbackReference.getCallback(CallbackReference.java:107) at com.sun.jna.Pointer.getValue(Pointer.java:430) at com.sun.jna.Structure.readField(Structure.java:705) at com.sun.jna.Structure.read(Structure.java:565) at IVRSystem.<init>(vr.kt:2091) at VrKt.VR_Init(vr.kt:2116) at VrKt.main(vr.kt:2133) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
根据这个评论 ，它看起来像有多个调用一个特定的回调（ GetEyeToHeadTransform_callback ？），但它不是，我检查和双重检查的代码，只有一个引用到该回调..
还有什么呢？
编辑：
首先，当我read() IVRSysten类时发生这种情况，但我无法避免这种情况…
第二，我看到， 在这里所有以前的方法得到真正的地址，如native@0x7fee4bebfd0 ，只有GetEyeToHeadTransform得到总是native@0xffffffff …
EDIT2：
调查原始代码
dprintf("GetRecommendedRenderTargetSize %p\n", &vr::IVRSystem::GetRecommendedRenderTargetSize); dprintf("GetProjectionMatrix %p\n", &vr::IVRSystem::GetProjectionMatrix); dprintf("GetProjectionRaw %p\n", &vr::IVRSystem::GetProjectionRaw); dprintf("ComputeDistortion %p\n", &vr::IVRSystem::ComputeDistortion); dprintf("GetEyeToHeadTransform %p\n", &vr::IVRSystem::GetEyeToHeadTransform); dprintf("GetTimeSinceLastVsync %p\n", &vr::IVRSystem::GetTimeSinceLastVsync); dprintf("GetD3D9AdapterIndex %p\n", &vr::IVRSystem::GetD3D9AdapterIndex); dprintf("GetDXGIOutputInfo %p\n", &vr::IVRSystem::GetDXGIOutputInfo); dprintf("IsDisplayOnDesktop %p\n", &vr::IVRSystem::IsDisplayOnDesktop); dprintf("SetDisplayVisibility %p\n", &vr::IVRSystem::SetDisplayVisibility); dprintf("GetDeviceToAbsoluteTrackingPose %p\n", &vr::IVRSystem::GetDeviceToAbsoluteTrackingPose); dprintf("ResetSeatedZeroPose %p\n", &vr::IVRSystem::ResetSeatedZeroPose); dprintf("GetSeatedZeroPoseToStandingAbsoluteTrackingPose %p\n", &vr::IVRSystem::GetSeatedZeroPoseToStandingAbsoluteTrackingPose);
打印出来
GetRecommendedRenderTargetSize 0109871D GetProjectionMatrix 0109AACC GetProjectionRaw 0109AAD1 ComputeDistortion 0109AAF9 GetEyeToHeadTransform 0109AAC2 GetTimeSinceLastVsync 0109AAE5 GetD3D9AdapterIndex 0109AAF4 GetDXGIOutputInfo 0109AADB IsDisplayOnDesktop 0109AAEA SetDisplayVisibility 0109AAE0 GetDeviceToAbsoluteTrackingPose 0109AAEF ResetSeatedZeroPose 0109AAD6 GetSeatedZeroPoseToStandingAbsoluteTrackingPose 0109AAC7
GetEyeToHeadTransform和GetSeatedZeroPoseToStandingAbsoluteTrackingPose有不同的指针
本机代码使用-1的“魔术”值来表示多个回调签名。 当这个JNA的回调代码被写入时，假定把相同的函数指针映射到两个不同的签名应该是错误的。
我猜测-1值意味着像“使用默认回调”（当可以简单地指出NULL指针可能已经足够，除非库使用NULL来指示不要调用回调）。
你可以通过重写Structure.read()或者Structure.readField()来返回一个魔术值或者常量回调对象，当你看到-1值时，例如
public void read() { Memory old = getPointer(); Memory m = autoAllocate(size()); // horribly inefficient, but it'll do m.write(0, old.getByteArray(0, size()), 0, size()); useMemory(m); // Zero out the problematic callbacks for (field : problematic_fields) { m.setPointer(field_offset, null); } super.read(); useMemory(old); }