jni jnienv NewDoubleArray example c c++ java

New<PrimitiveType>Array Routines - NewDoubleArray

ArrayType New<PrimitiveType>Array(JNIEnv *env, jsize length);

A family of operations used to construct a new primitive array object. Table 4-8 describes the specific primitive array constructors. You should replace New<PrimitiveType>Array with one of the actual primitive array constructor routine names from the following table, and replace ArrayType with the corresponding array type for that routine.(NewDoubleArray)

Table 4-8a New<PrimitiveType>Array Family of Array Constructors

New<PrimitiveType>Array Routines	Array Type
NewBooleanArray()	jbooleanArray
NewByteArray()	jbyteArray
NewCharArray()	jcharArray
NewShortArray()	jshortArray
NewIntArray()	jintArray
NewLongArray()	jlongArray
NewFloatArray()	jfloatArray
NewDoubleArray()	jdoubleArray

LINKAGE:

Indices in the JNIEnv interface function table.

Table 4-8b New<PrimitiveType>Array Family of Array Constructors

New<PrimitiveType>Array Routines	Index
NewBooleanArray()	175
NewByteArray()	176
NewCharArray()	177
NewShortArray()	178
NewIntArray()	179
NewLongArray()	180
NewFloatArray()	181
NewDoubleArray()	182

PARAMETERS of NewDoubleArray

env: the JNI interface pointer.

length: the array length.

RETURNS of NewDoubleArray

Returns a Java array, or NULL if the array cannot be constructed.

Example of NewDoubleArray



jdoubleArray ret = env->NewDoubleArray(2);

jdouble* rotationsJ = (jdouble *) malloc(2*sizeof(jdouble));
rotationsJ[0] = 4.0; 
rotationsJ[1] = 4.0;

cout<<"Rotations 0..."<<rotationsJ[0];
env->SetDoubleArrayRegion(ret, 0, 2, (const jdouble*)rotationsJ);

return  ret;