iOS上的本机JNI [英] Native JNI on iOS

问题描述

我已经能够成功构建一个C ++共享库，并使用Java本地函数在Android上访问该代码。我试图在iOS上重现这种努力。使用CMake，我能够配置和构建我的共享库为.dylib，并在我的iPhone / iPad模拟器上加载它 System.loadLibrary（）。但是，当我调用本机函数时，我得到一个 UnsatisfiedLinkError 。使用 nm 的快速检查验证我已按预期导出JNI函数。有人能告诉我我做错了什么？

I have been able to successfully build a C++ shared library and use Java native functions to access that code on Android. I am trying to reproduce this effort on iOS. Using CMake, I was able to configure and build my shared library as a .dylib, and load it with System.loadLibrary() on my iPhone/iPad emulator. However, when I call a native function I get an UnsatisfiedLinkError. A quick check with nm verifies that I have exported the JNI functions as I expected. Can somebody tell me what I'm doing wrong? Do I need to modify the native function names for Apple somehow?

nm ：

000000000011Ce0 T _Java_com_test_Native_getPointer

Native.java ：

public static native long getPointer();

在C ++代码中：

extern "C" {
JNIEXPORT jlong JNICALL Java_com_test_Native_getPointer(JNIEnv* env, jobject thiz)
{
    return (jlong)0;
}

错误是：

java.lang.UnsatisfiedLinkError: com/test/Native.getPointer(I)J

已解决！

我手动输入方法签名，看到另一个屏幕，关键元素：

I had typed the method signature by hand looking at another screen, and accidentally left out a crucial element:

JNIEXPORT jlong JNICALL Java_com_test_Native_getPointer(JNIEnv* env, jobject thiz, int test)

删除 int test 解决了问题。

推荐答案

解决方法：
我手动键入方法签名，另一个屏幕，并意外地遗漏了一个关键的元素：

SOLVED: I had typed the method signature by hand looking at another screen, and accidentally left out a crucial element:

JNIEXPORT jlong JNICALL Java_com_test_Native_getPointer(JNIEnv* env, jobject thiz, int test)

删除 int test 解决了问题。

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