2

我正在尝试做一个openvr java 绑定的kotlin 端口,并将其更新到 1.0.3

我开始写IVRSystem结构/类

我手动编写了所有方法,以确保 Intellij 中的自动翻译器不会出现任何错误

我摆脱了来自不同数量字段的所有错误,getFieldOrder()但现在我仍然收到错误:

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)

根据此评论,似乎对特定回调(GetEyeToHeadTransform_callback?)有多次调用,但事实并非如此,我检查并仔细检查了代码,该回调只有一个引用。

还可能是什么?

编辑:

首先,这发生在我read()上课时IVRSysten,但我无法避免......

其次,我看到这里所有以前的方法都得到了真实的地址,例如native@0x7fee4bebfd0,只有GetEyeToHeadTransform得到总是native@0xffffffff......

编辑2:

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

GetEyeToHeadTransformGetSeatedZeroPoseToStandingAbsoluteTrackingPose有不同的指针..

4

2 回答 2

1

-1本机代码对多个回调签名使用“魔术”值。在编写此 JNA 回调代码时,假设将相同的函数指针映射到两个不同的签名应该是错误的。

我猜这个-1值的意思是“使用默认回调”(当可以说简单的 NULL 指针可能就足够了,除非库使用 NULL 来指示不调用回调)。

当您看到值时,您可以通过覆盖Structure.read()Structure.readField()返回一个魔术值或常量回调对象来解决这个问题-1,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);
}
于 2016-10-21T18:34:48.693 回答
0

尽管这是一个老问题,但我想分享我的经验。在我的情况下,我有一个本机对象,它作为映射了代理方法的结构传递给 Java。该对象是某种会话,它实现了一个应该删除本机对象本身的关闭方法。一旦调用 close 并删除本机对象,就会引发类似的异常。问题是在函数调用后 JNA 重新同步了已删除的本机对象。这可以通过将自动读取设置为 false 来解决。

public void close(Handler handler) {
    setAutoRead(false);
    close.invoke(this, handler);
    setAutoWrite(false);
}
于 2019-10-28T12:06:32.960 回答