JNI jni/cyberlevel9.c：17：31：错误：请求成员'NewDirectByteBuffer'不是结构或工会

JNI jni/cyberlevel9.c:17:31: error: request for member 'NewDirectByteBuffer' in something not a structure or union

本文关键字：NewDirectByteBuffer 结构 成员 cyberlevel9 jni 请求 错误 JNI      更新时间：2023-10-16

Eclipse在我尝试构建时给了我这个错误

jni/cyberlevel9.c:17:31: error: request for member 'NewDirectByteBuffer' in something  not a structure or union
jni/cyberlevel9.c:18:28: error: request for member 'NewGlobalRef' in something not a structure or union

这是代码的问题部分：

JNIEXPORT jobject JNICALL Java_com_cyberbg_natcamlevel9_NativeCameraLevel9Start_allocNativeBuffer(JNIEnv* env, jobject this, jlong size)
{
void* buffer = malloc(size);
jobject directBuffer = env->NewDirectByteBuffer(buffer, size);
jobject globalRef = env->NewGlobalRef(directBuffer);
return globalRef;
//return (NewDirectByteBuffer*)(*env)->NewDirectByteBuffer(buffer, size);
}

来自C程序的JNI调用看起来像

(*env)->fun(env, p1, ...)

您的调用风格在C++中是可以的，在jni.h:中定义了一个特殊的包装器类

env->fun(p1, ...)

您可以通过简单地将jni/cybrrlevel9.c重命名为jni/cyberlevel9.cpp 来解决问题

或者，

jobject directBuffer = (*env)->NewDirectByteBuffer(env, buffer, size); 
jobject globalRef = (*env)->NewGlobalRef(env, directBuffer);
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