[英]JNI call method of enum throws exception
I have the following enum inside my java code :我的java代码中有以下枚举:
package jni;
public enum Codec2Mode {
CODEC2_MODE_3200(0),
CODEC2_MODE_2400(1),
CODEC2_MODE_1600(2),
CODEC2_MODE_1400(3),
CODEC2_MODE_1300(4),
CODEC2_MODE_1200(5),
CODEC2_MODE_700C(8),
CODEC2_MODE_450(10),
CODEC2_MODE_450PWB(11);
private int m_code;
public int getCode()
{
return m_code;
}
Codec2Mode( int code )
{
m_code = code;
}
}
I need to pass it to JNI and use a value returned by getCode()
.我需要将它传递给 JNI 并使用
getCode()
返回的值。 For this I declare为此我宣布
public native void initialize(Codec2Mode mode);
And here is the way I'm trying to access it at C++ side :这是我尝试在 C++ 端访问它的方式:
JNIEXPORT void JNICALL Java_jni_Codec2Wrapper_initialize
(JNIEnv * env, jobject, jobject mode)
{
jclass enumClass = env->FindClass("jni/Codec2Mode");
jmethodID getCodeMethod = env->GetMethodID(enumClass, "getCode", "(V)I");
jint value = env->CallIntMethod(mode, getCodeMethod);
std::cout << "Arg = " << value << std::endl;
}
From java I call codec2.initialize(Codec2Mode.CODEC2_MODE_2400);
从 java 我调用
codec2.initialize(Codec2Mode.CODEC2_MODE_2400);
. . But I get segmentation fault.
但我得到了分段错误。 What's could be an issue here?
这里可能有什么问题?
You have incorrect signature here:您的签名不正确:
jmethodID getCodeMethod = env->GetMethodID(enumClass, "getCode", "(V)I");
It should read: "()I"
它应该是:
"()I"
It's how it is defined in your class.这就是它在您的类中的定义方式。
public int getCode();
descriptor: ()I
you can get signature of the method like that你可以得到这样的方法的签名
> javap -cp . -s -p jni.Codec2Mode
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