Example #1
0
// GoByteArray converts the provided Java byte array into a Go byte slice.
func GoByteArray(env Env, arr Object) (ret []byte) {
	if arr.IsNull() {
		return nil
	}
	length := int(C.GetArrayLength(env.value(), C.jarray(arr.value())))
	ret = make([]byte, length)
	bytes := C.GetByteArrayElements(env.value(), C.jbyteArray(arr.value()), nil)
	defer C.ReleaseByteArrayElements(env.value(), C.jbyteArray(arr.value()), bytes, C.JNI_ABORT)
	ptr := bytes
	for i := 0; i < length; i++ {
		ret[i] = byte(*ptr)
		ptr = (*C.jbyte)(unsafe.Pointer(uintptr(unsafe.Pointer(ptr)) + unsafe.Sizeof(*ptr)))
	}
	return
}
Example #2
0
// GoLongArray converts the provided Java long array into a Go int64 slice.
func GoLongArray(env Env, arr Object) (ret []int64) {
	if arr.IsNull() {
		return
	}
	length := int(C.GetArrayLength(env.value(), C.jarray(arr.value())))
	ret = make([]int64, length)
	elems := C.GetLongArrayElements(env.value(), C.jlongArray(arr.value()), nil)
	defer C.ReleaseLongArrayElements(env.value(), C.jlongArray(arr.value()), elems, C.JNI_ABORT)
	ptr := elems
	for i := 0; i < length; i++ {
		ret[i] = int64(*ptr)
		ptr = (*C.jlong)(unsafe.Pointer(uintptr(unsafe.Pointer(ptr)) + unsafe.Sizeof(*ptr)))
	}
	return
}
Example #3
0
// GoObjectArray converts a Java object array to a Go slice of Java objects.
func GoObjectArray(env Env, arr Object) ([]Object, error) {
	if arr.IsNull() {
		return nil, nil
	}
	length := int(C.GetArrayLength(env.value(), C.jarray(arr.value())))
	ret := make([]Object, length)
	for i := 0; i < length; i++ {
		ret[i] = Object(uintptr(unsafe.Pointer(C.GetObjectArrayElement(env.value(), C.jobjectArray(arr.value()), C.jsize(i)))))
		if err := JExceptionMsg(env); err != nil {
			// Out-of-bounds index.
			return nil, err
		}
	}
	return ret, nil
}