EXCEPTION_ACCESS_VIOLATION (0xc0000005) 来自 JNI 的 JVM？

我在 vc++ 中用 JNI 编写了一些本机方法，以便从 java 访问。我的三种方法中有两种工作得很好，没有任何问题。然而，当我在运行时调用我的最后一个方法时，它会导致以下错误消息：

# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x61e06550, pid=3408, tid=4796
#
# JRE version: 7.0-b147
# Java VM: Java HotSpot(TM) Client VM (21.0-b17 mixed mode, sharing windows-x86 )
# Problematic frame:
# V  [jvm.dll+0xa6550]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows

这是我的本机方法的代码（在 vc++ 中）：

JNIEXPORT jcharArray JNICALL Java_jniusb_Main_receiveData (JNIEnv *env, jclass, jchar dataIndex)
{
    DWORD BytesWritten = 0;
    DWORD BytesRead = 0;
    unsigned char OutputPacketBuffer[65];   
    unsigned char InputPacketBuffer[65];    

    static jcharArray ReturnPacketBuffer;
    jchar temp[65];

    //send 'receive data' command to the firmware (OutputPacketBuffer[1])
    WriteFile(WriteHandle, &OutputPacketBuffer, 65, &BytesWritten, 0);
        //retrieve data from firmware
    ReadFile(ReadHandle, &InputPacketBuffer, 65, &BytesRead, 0);        

        for(int i=0;i<64;i++) 
    {
        temp[i] = jchar(InputPacketBuffer[i+1]);
    }

    (*env).SetCharArrayRegion(ReturnPacketBuffer, 0, 64, temp);
    return ReturnPacketBuffer;
}

我的 Java 代码如下所示（当然是缩写的）：

public static native char[] receiveData(char dataIndex);

public static void main(String[] args) {
    char vid = 0x4d8;
    char pid = 0x3f;

    //check if read/write handles were retrieved 
    if(connectHid(vid, pid) == true)
    {
        System.out.println("connected!!!");
    }
    else
    {
        System.out.println("not connected...");
    }


    char[] test = new char[64];
    char[] receivetest = new char[64];

    char length = 0x03;
    char dataIndex = 0x81;

    test[0] = 0x80;
    test[1] = 0x80;
    sendData(test, length);
    receivetest = receiveData(dataIndex);

正如我之前所说，其他方法（即 connect 和 senddata）工作正常，但我从 receiveData 方法中收到错误。经过一些调试后，我发现当我注释掉该行时，错误消失了：

(*env).SetCharArrayRegion(ReturnPacketBuffer, 0, 64, temp);

在我的本机代码中（当然在这种情况下数据永远不会返回......）。我在这里做错了什么？

你是不是缺少类似的东西ReturnPacketBuffer = (*env)->NewCharArray(env, 64);