为什么传递 java long 作为指向 C++ 库中结构的指针会导致应用程序崩溃？
Why is passing java long as pointer to struct in c++ library crashing app?
我正在尝试通过 java 遵循此线程中概述的步骤在 C++ 库中保留引用：Passing pointers between C and Java through JNI
但是，当我 运行 应用程序时，它立即崩溃了。有人可以看看我做错了什么吗？把我的头发拉得太长了...
编辑：
应超级用户迈克尔的要求添加了完整的代码和堆栈跟踪。如果 testingHandle bool 设置为 false，则代码 运行 没问题。如果设置为 true
则崩溃
编辑 2：而且，这是一个打字错误...已在下方修复
申请代码：
package com.AndroidCPP;
import android.app.Activity;
import android.widget.TextView;
import android.os.Bundle;
import android.util.Log;
public class AndroidCPP extends Activity
{
//Set Activity tag for logging (adb command: adb logcat *:s AndroidCPP:V)
private static final String TAG = "AndroidCPP";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
boolean testingHandle = true;
if(testingHandle)
{
DynamicLib newLib = new DynamicLib();
newLib.Init();
newLib.CleanUp();
}
//pull device info from lib
int libNum = DynamicLib.GetNumber(3);
String ipAddress = DynamicLib.GetLocalIPv4();
String serialNumber = DynamicLib.GetSerialNumber();
//Textview will only work on regular android device, you'll be in the black void if run on a quest
TextView tv = new TextView(this);
String textViewString = String.format("Here is a number that was the cause of addition in a C++ library : %d \n", libNum);
textViewString += String.format("Here is the IP Adrress Pulled from the DL: %s", ipAddress);
textViewString += "\n";
textViewString += "Here is the IP Address Pulled from Java Utils: " + Utils.getIPAddress(true);
textViewString += "\n";
textViewString += String.format("Here is the serial Number pulled from DL: %s", serialNumber);
tv.setText(textViewString);
//Logcat Log
Log.v(TAG, "");
Log.v(TAG, "***************");
Log.v(TAG, "JAVA ip: " + Utils.getIPAddress(true));
Log.v(TAG, "C++ ip :" + ipAddress);
Log.v(TAG, "JAVA MAC : " + Utils.getMACAddress("wlan0"));
Log.v(TAG, "Serial Number : " + serialNumber);
setContentView(tv);
}
}
java 边:
package com.AndroidCPP;
class DynamicLib
{
static{
System.loadLibrary("DynamicLib");
}
long testHandle = 0;
public void Init()
{
testHandle = CreateMemory();
}
public void CleanUp()
{
FreeMemory(testHandle);
}
public native long CreateMemory();
public native void FreeMemory(long ptr);
public static native int GetNumber(int testParameter);
public static native String GetLocalIPv4();
public static native String GetSerialNumber();
}
菲律宾共产党方面：
#include <jni.h>
#include <android/log.h>
#include "TestClass.h"
#include "IPFetch.h"
#define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, "DynamicLib", __VA_ARGS__))
#define LOGW(...) ((void)__android_log_print(ANDROID_LOG_WARN, "DynamicLib", __VA_ARGS__))
extern "C" {
JNIEXPORT jlong JNICALL Java_com_AndroidCPP_DynamicLib_CreateMemory(JNIEnv* env, jobject obj)
{
DynamicLib::testStruct* newPtr = new DynamicLib::testStruct();
return (jlong)newPtr;
}
JNIEXPORT void JNICALL Java_com_AndroidCPP_DynamicLib_FreeMemory(JNIEnv* env, jobject obj, jlong ptr)
{
DynamicLib::testStruct* tempStructPtr = (DynamicLib::testStruct*)ptr;
delete tempStructPtr;
}
JNIEXPORT int JNICALL Java_com_AndroidCPP_DynamicLib_GetNumber(JNIEnv* env, jobject obj, int testParameter)
{
LOGI("Calling Get Number From Dynamic Lib With Test Parameter %d", testParameter);
DynamicLib::TestClass testClass;
return testClass.AddTwoNumbers(testParameter, 2);
}
JNIEXPORT jstring JNICALL Java_com_AndroidCPP_DynamicLib_GetLocalIPv4(JNIEnv* env, jobject obj)
{
DynamicLib::IPFetch ipFetch;
jstring returnString = env->NewStringUTF(ipFetch.FetchLocalIPv4().c_str());
return returnString;
}
JNIEXPORT jstring JNICALL Java_com_AndroidCPP_DynamicLib_GetSerialNumber(JNIEnv* env, jobject obj)
{
DynamicLib::IPFetch ipFetch;
return env->NewStringUTF(ipFetch.FetchSerialNumber().c_str());
}
}
单独 headers/cpp（不是句柄的一部分，但功能正常
namespace DynamicLib {
struct testStruct {
int x = 10;
int y = 10;
};
class TestClass
{
public:
TestClass() = default;
~TestClass();
int AddTwoNumbers(int a, int b);
};
}
#include <string.h>
#include <iostream>
namespace DynamicLib
{
class IPFetch
{
public:
IPFetch() = default;
~IPFetch();
std::string FetchLocalIPv4();
std::string FetchSerialNumber();
};
}
#include "IPFetch.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <stdio.h>
#include <dlfcn.h>
#include <android/log.h>
#include <string>
#include <sstream>
using namespace DynamicLib;
IPFetch::~IPFetch()
{
}
std::string IPFetch::FetchLocalIPv4()
{
int s;
struct ifreq ifr;
char stringBuffer[16];
const char *ipCast = "%d.%d.%d.%d";
s = socket(AF_INET, SOCK_DGRAM, 0);
strcpy(ifr.ifr_name, "wlan0");
ioctl(s, SIOCGIFADDR, &ifr);
unsigned char *ip = (unsigned char*)(&ifr.ifr_addr.sa_data[2]);
close(s);
snprintf(stringBuffer, sizeof(stringBuffer), ipCast, ip[0], ip[1], ip[2], ip[3]);
return std::string(stringBuffer);
}
std::string IPFetch::FetchSerialNumber()
{
typedef int(*PFN_SYSTEM_PROP_GET)(const char *, char *);
#if (__ANDROID_API__ >= 21)
static PFN_SYSTEM_PROP_GET __real_system_property_get = NULL;
if (!__real_system_property_get) {
// libc.so should already be open, get a handle to it.
void *handle = dlopen("libc.so", RTLD_NOLOAD);
if (!handle) {
__android_log_print(ANDROID_LOG_ERROR, "foobar", "Cannot dlopen libc.so: %s.\n", dlerror());
}
else {
__real_system_property_get = (PFN_SYSTEM_PROP_GET)dlsym(handle, "__system_property_get");
}
if (!__real_system_property_get) {
__android_log_print(ANDROID_LOG_ERROR, "foobar", "Cannot resolve __system_property_get(): %s.\n", dlerror());
}
}
char buff[64];
std::ostringstream stm;
stm << ((*__real_system_property_get)("ro.boot.serialno", buff));
std::string returnVal = stm.str();
return std::string(buff);
#endif // __ANDROID_API__ >= 21
return "-1";
}
错误output/stack跟踪，可以看到是执行CreateMemory()函数失败
05-05 00:49:39.831 11430 11430 I chatty : uid=10297(com.AndroidCPP) identical 2 lines
05-05 00:49:40.031 11430 11430 I System.out: waiting for debugger to settle...
05-05 00:49:40.231 11430 11430 I System.out: debugger has settled (1306)
05-05 00:49:40.244 1503 2852 E InputDispatcher: Window handle Window{b5ce578 u0 Waiting For Debugger: com.AndroidCPP} has no registered input channel
05-05 00:49:40.523 11430 11430 I com.AndroidCPP: The ClassLoaderContext is a special shared library.
05-05 00:49:41.116 11430 11430 E com.AndroidCPP: No implementation found for long com.AndroidCPP.DynamicLib.CreateMemory() (tried Java_com_AndroidCPP_DynamicLib_CreateMemory and Java_com_AndroidCPP_DynamicLib_CreateMemory__)
05-05 00:49:41.117 11430 11430 D AndroidRuntime: Shutting down VM
05-05 00:49:41.141 11430 11430 E AndroidRuntime: FATAL EXCEPTION: main
05-05 00:49:41.141 11430 11430 E AndroidRuntime: Process: com.AndroidCPP, PID: 11430
05-05 00:49:41.141 11430 11430 E AndroidRuntime: java.lang.UnsatisfiedLinkError: No implementation found for long com.AndroidCPP.DynamicLib.CreateMemory() (tried Java_com_AndroidCPP_DynamicLib_CreateMemory and Java_com_AndroidCPP_DynamicLib_CreateMemory__)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.AndroidCPP.DynamicLib.CreateMemory(Native Method)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.AndroidCPP.DynamicLib.Init(DynamicLib.java:14)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.AndroidCPP.AndroidCPP.onCreate(AndroidCPP.java:26)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.Activity.performCreate(Activity.java:7825)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.Activity.performCreate(Activity.java:7814)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1306)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:107)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.os.Looper.loop(Looper.java:214)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7356)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
05-05 00:49:41.157 1503 11483 I DropBoxManagerService: add tag=data_app_crash isTagEnabled=true flags=0x2
05-05 00:49:41.157 1503 2991 W ActivityTaskManager: Force finishing activity com.AndroidCPP/.AndroidCPP
05-05 00:49:41.182 11430 11430 I Process : Sending signal. PID: 11430 SIG: 9
05-05 00:49:41.184 1503 1579 E libprocessgroup: set_timerslack_ns write failed: No such process
05-05 00:49:41.218 1503 3340 I ActivityManager: Process com.AndroidCPP (pid 11430) has died: vis+99 TOP
05-05 00:49:41.220 937 937 I Zygote : Process 11430 exited due to signal 9 (Killed)
你的C++有多长long?
C++ 中的大小是特定于实现的，唯一的要求是至少为 32 位。一些编译器 long 和 int 是 32 位，指针是 64 位。
最好在 C++ 代码中使用类似 uint64_t 的东西。
这一行有问题：
return (long)newPtr;
long 和 jlong 不是相同的数据类型，后者可能更宽。改为 jlong。
return (jlong)newPtr;
"No implementation found for long com.AndroidCPP.DynamicLib.CreateMemory"
您的代码有错别字：Java_com_AndroidCPP_DynamciLib_CreateMemory
应该是：Java_com_AndroidCPP_DynamicLib_CreateMemory
FreeMemory 也一样。
我正在尝试通过 java 遵循此线程中概述的步骤在 C++ 库中保留引用：Passing pointers between C and Java through JNI
但是，当我 运行 应用程序时，它立即崩溃了。有人可以看看我做错了什么吗？把我的头发拉得太长了...
编辑： 应超级用户迈克尔的要求添加了完整的代码和堆栈跟踪。如果 testingHandle bool 设置为 false，则代码 运行 没问题。如果设置为 true
则崩溃编辑 2：而且，这是一个打字错误...已在下方修复
申请代码：
package com.AndroidCPP;
import android.app.Activity;
import android.widget.TextView;
import android.os.Bundle;
import android.util.Log;
public class AndroidCPP extends Activity
{
//Set Activity tag for logging (adb command: adb logcat *:s AndroidCPP:V)
private static final String TAG = "AndroidCPP";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
boolean testingHandle = true;
if(testingHandle)
{
DynamicLib newLib = new DynamicLib();
newLib.Init();
newLib.CleanUp();
}
//pull device info from lib
int libNum = DynamicLib.GetNumber(3);
String ipAddress = DynamicLib.GetLocalIPv4();
String serialNumber = DynamicLib.GetSerialNumber();
//Textview will only work on regular android device, you'll be in the black void if run on a quest
TextView tv = new TextView(this);
String textViewString = String.format("Here is a number that was the cause of addition in a C++ library : %d \n", libNum);
textViewString += String.format("Here is the IP Adrress Pulled from the DL: %s", ipAddress);
textViewString += "\n";
textViewString += "Here is the IP Address Pulled from Java Utils: " + Utils.getIPAddress(true);
textViewString += "\n";
textViewString += String.format("Here is the serial Number pulled from DL: %s", serialNumber);
tv.setText(textViewString);
//Logcat Log
Log.v(TAG, "");
Log.v(TAG, "***************");
Log.v(TAG, "JAVA ip: " + Utils.getIPAddress(true));
Log.v(TAG, "C++ ip :" + ipAddress);
Log.v(TAG, "JAVA MAC : " + Utils.getMACAddress("wlan0"));
Log.v(TAG, "Serial Number : " + serialNumber);
setContentView(tv);
}
}
java 边:
package com.AndroidCPP;
class DynamicLib
{
static{
System.loadLibrary("DynamicLib");
}
long testHandle = 0;
public void Init()
{
testHandle = CreateMemory();
}
public void CleanUp()
{
FreeMemory(testHandle);
}
public native long CreateMemory();
public native void FreeMemory(long ptr);
public static native int GetNumber(int testParameter);
public static native String GetLocalIPv4();
public static native String GetSerialNumber();
}
菲律宾共产党方面：
#include <jni.h>
#include <android/log.h>
#include "TestClass.h"
#include "IPFetch.h"
#define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, "DynamicLib", __VA_ARGS__))
#define LOGW(...) ((void)__android_log_print(ANDROID_LOG_WARN, "DynamicLib", __VA_ARGS__))
extern "C" {
JNIEXPORT jlong JNICALL Java_com_AndroidCPP_DynamicLib_CreateMemory(JNIEnv* env, jobject obj)
{
DynamicLib::testStruct* newPtr = new DynamicLib::testStruct();
return (jlong)newPtr;
}
JNIEXPORT void JNICALL Java_com_AndroidCPP_DynamicLib_FreeMemory(JNIEnv* env, jobject obj, jlong ptr)
{
DynamicLib::testStruct* tempStructPtr = (DynamicLib::testStruct*)ptr;
delete tempStructPtr;
}
JNIEXPORT int JNICALL Java_com_AndroidCPP_DynamicLib_GetNumber(JNIEnv* env, jobject obj, int testParameter)
{
LOGI("Calling Get Number From Dynamic Lib With Test Parameter %d", testParameter);
DynamicLib::TestClass testClass;
return testClass.AddTwoNumbers(testParameter, 2);
}
JNIEXPORT jstring JNICALL Java_com_AndroidCPP_DynamicLib_GetLocalIPv4(JNIEnv* env, jobject obj)
{
DynamicLib::IPFetch ipFetch;
jstring returnString = env->NewStringUTF(ipFetch.FetchLocalIPv4().c_str());
return returnString;
}
JNIEXPORT jstring JNICALL Java_com_AndroidCPP_DynamicLib_GetSerialNumber(JNIEnv* env, jobject obj)
{
DynamicLib::IPFetch ipFetch;
return env->NewStringUTF(ipFetch.FetchSerialNumber().c_str());
}
}
单独 headers/cpp（不是句柄的一部分，但功能正常
namespace DynamicLib {
struct testStruct {
int x = 10;
int y = 10;
};
class TestClass
{
public:
TestClass() = default;
~TestClass();
int AddTwoNumbers(int a, int b);
};
}
#include <string.h>
#include <iostream>
namespace DynamicLib
{
class IPFetch
{
public:
IPFetch() = default;
~IPFetch();
std::string FetchLocalIPv4();
std::string FetchSerialNumber();
};
}
#include "IPFetch.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <stdio.h>
#include <dlfcn.h>
#include <android/log.h>
#include <string>
#include <sstream>
using namespace DynamicLib;
IPFetch::~IPFetch()
{
}
std::string IPFetch::FetchLocalIPv4()
{
int s;
struct ifreq ifr;
char stringBuffer[16];
const char *ipCast = "%d.%d.%d.%d";
s = socket(AF_INET, SOCK_DGRAM, 0);
strcpy(ifr.ifr_name, "wlan0");
ioctl(s, SIOCGIFADDR, &ifr);
unsigned char *ip = (unsigned char*)(&ifr.ifr_addr.sa_data[2]);
close(s);
snprintf(stringBuffer, sizeof(stringBuffer), ipCast, ip[0], ip[1], ip[2], ip[3]);
return std::string(stringBuffer);
}
std::string IPFetch::FetchSerialNumber()
{
typedef int(*PFN_SYSTEM_PROP_GET)(const char *, char *);
#if (__ANDROID_API__ >= 21)
static PFN_SYSTEM_PROP_GET __real_system_property_get = NULL;
if (!__real_system_property_get) {
// libc.so should already be open, get a handle to it.
void *handle = dlopen("libc.so", RTLD_NOLOAD);
if (!handle) {
__android_log_print(ANDROID_LOG_ERROR, "foobar", "Cannot dlopen libc.so: %s.\n", dlerror());
}
else {
__real_system_property_get = (PFN_SYSTEM_PROP_GET)dlsym(handle, "__system_property_get");
}
if (!__real_system_property_get) {
__android_log_print(ANDROID_LOG_ERROR, "foobar", "Cannot resolve __system_property_get(): %s.\n", dlerror());
}
}
char buff[64];
std::ostringstream stm;
stm << ((*__real_system_property_get)("ro.boot.serialno", buff));
std::string returnVal = stm.str();
return std::string(buff);
#endif // __ANDROID_API__ >= 21
return "-1";
}
错误output/stack跟踪，可以看到是执行CreateMemory()函数失败
05-05 00:49:39.831 11430 11430 I chatty : uid=10297(com.AndroidCPP) identical 2 lines
05-05 00:49:40.031 11430 11430 I System.out: waiting for debugger to settle...
05-05 00:49:40.231 11430 11430 I System.out: debugger has settled (1306)
05-05 00:49:40.244 1503 2852 E InputDispatcher: Window handle Window{b5ce578 u0 Waiting For Debugger: com.AndroidCPP} has no registered input channel
05-05 00:49:40.523 11430 11430 I com.AndroidCPP: The ClassLoaderContext is a special shared library.
05-05 00:49:41.116 11430 11430 E com.AndroidCPP: No implementation found for long com.AndroidCPP.DynamicLib.CreateMemory() (tried Java_com_AndroidCPP_DynamicLib_CreateMemory and Java_com_AndroidCPP_DynamicLib_CreateMemory__)
05-05 00:49:41.117 11430 11430 D AndroidRuntime: Shutting down VM
05-05 00:49:41.141 11430 11430 E AndroidRuntime: FATAL EXCEPTION: main
05-05 00:49:41.141 11430 11430 E AndroidRuntime: Process: com.AndroidCPP, PID: 11430
05-05 00:49:41.141 11430 11430 E AndroidRuntime: java.lang.UnsatisfiedLinkError: No implementation found for long com.AndroidCPP.DynamicLib.CreateMemory() (tried Java_com_AndroidCPP_DynamicLib_CreateMemory and Java_com_AndroidCPP_DynamicLib_CreateMemory__)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.AndroidCPP.DynamicLib.CreateMemory(Native Method)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.AndroidCPP.DynamicLib.Init(DynamicLib.java:14)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.AndroidCPP.AndroidCPP.onCreate(AndroidCPP.java:26)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.Activity.performCreate(Activity.java:7825)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.Activity.performCreate(Activity.java:7814)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1306)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:107)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.os.Looper.loop(Looper.java:214)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7356)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
05-05 00:49:41.141 11430 11430 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
05-05 00:49:41.157 1503 11483 I DropBoxManagerService: add tag=data_app_crash isTagEnabled=true flags=0x2
05-05 00:49:41.157 1503 2991 W ActivityTaskManager: Force finishing activity com.AndroidCPP/.AndroidCPP
05-05 00:49:41.182 11430 11430 I Process : Sending signal. PID: 11430 SIG: 9
05-05 00:49:41.184 1503 1579 E libprocessgroup: set_timerslack_ns write failed: No such process
05-05 00:49:41.218 1503 3340 I ActivityManager: Process com.AndroidCPP (pid 11430) has died: vis+99 TOP
05-05 00:49:41.220 937 937 I Zygote : Process 11430 exited due to signal 9 (Killed)
你的C++有多长long?
C++ 中的大小是特定于实现的，唯一的要求是至少为 32 位。一些编译器 long 和 int 是 32 位，指针是 64 位。
最好在 C++ 代码中使用类似 uint64_t 的东西。
这一行有问题：
return (long)newPtr;
long 和 jlong 不是相同的数据类型，后者可能更宽。改为 jlong。
return (jlong)newPtr;
"No implementation found for long com.AndroidCPP.DynamicLib.CreateMemory"
您的代码有错别字：Java_com_AndroidCPP_DynamciLib_CreateMemory
应该是：Java_com_AndroidCPP_DynamicLib_CreateMemory
FreeMemory 也一样。