jni jnienv SetFloatArrayRegion example c c++ java

Set<PrimitiveType>ArrayRegion Routines - SetFloatArrayRegion

void Set<PrimitiveType>ArrayRegion(JNIEnv *env, ArrayType array, jsize start, jsize len, NativeType *buf); (SetFloatArrayRegion)

A family of functions that copies back a region of a primitive array from a buffer.

The following table describes the specific primitive array element accessors. You should make the following replacements: (SetFloatArrayRegion)

• Replace Set<PrimitiveType>ArrayRegion with one of the actual primitive element accessor routine names from the table.

• Replace ArrayType with the corresponding array type.

• Replace NativeType with the corresponding native type for that routine.
  Table 4-13a Set<PrimitiveType>ArrayRegion Family of Array Accessor Routines

  Set<PrimitiveType>ArrayRegion Routine	Array Type	Native Type
  SetBooleanArrayRegion()	jbooleanArray	jboolean
  SetByteArrayRegion()	jbyteArray	jbyte
  SetCharArrayRegion()	jcharArray	jchar
  SetShortArrayRegion()	jshortArray	jshort
  SetIntArrayRegion()	jintArray	jint
  SetLongArrayRegion()	jlongArray	jlong
  SetFloatArrayRegion()	jfloatArray	jfloat
  SetDoubleArrayRegion()	jdoubleArray	jdouble

LINKAGE of SetFloatArrayRegion

Indices in the JNIEnv interface function table.

Table 4-13b Set<PrimitiveType>ArrayRegion Family of Array Accessor Routines

Set<PrimitiveType>ArrayRegion Routine	Index
SetBooleanArrayRegion()	207
SetByteArrayRegion()	208
SetCharArrayRegion()	209
SetShortArrayRegion()	210
SetIntArrayRegion()	211
SetLongArrayRegion()	212
SetFloatArrayRegion()	213
SetDoubleArrayRegion()	214

PARAMETERS of SetFloatArrayRegion

env: the JNI interface pointer.

array: a Java array.

start: the starting index.

len: the number of elements to be copied.

buf: the source buffer.

THROWS:

ArrayIndexOutOfBoundsException: if one of the indexes in the region is not valid.

Example of SetFloatArrayRegion

        case 'F': {
            jfloat* bufferArray = reinterpret_cast<jfloat*>(AgentBase::GetMemoryManager()
                    .Allocate(sizeof(jfloat)*values JDWP_FILE_LINE));
            AgentAutoFree scavenger(bufferArray JDWP_FILE_LINE);
            
            for (int i = 0; i < values; i++) {
                value = m_cmdParser->command.ReadUntaggedValue(jni, JDWP_TAG_FLOAT);
                JDWP_TRACE_DATA("SetValues: set: index=" << i
                    << ", value=(float)" << value.f);
                bufferArray[i] = value.f;
            }
            jni->SetFloatArrayRegion(static_cast<jfloatArray>(arrayObject), firstIndex, values, bufferArray);
            break;
        }