jni jnienv NewBooleanArray example c c++ java

New<PrimitiveType>Array Routines - NewBooleanArray

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.

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 NewBooleanArray

env: the JNI interface pointer.

length: the array length.

RETURNS of NewBooleanArray

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

Example of NewBooleanArray

EDIT: This is how I convert the boolean array to unsigned char in C:

 jboolean *element = (*env)->GetBooleanArrayElements(env,chosen_packet,0);
 for(j = 0; j < sz; j++)
          src_pkt[j] = (unsigned char)element[j];

This src_pkt is acted upon and then I convert it back to jboolean .

EDIT2: This is how I convert the unsigned char array back to jboolean:

 jbooleanArray arr = (*env)->NewBooleanArray(env,sz);
 (*env)->SetBooleanArrayRegion(env,arr,0,sz,src_pkts);
 (*env)->DeleteLocalRef(env,arr);