getPrefix method

String? getPrefix()

Gets the the prefix.

return The prefix. throws BiosealException An error has occurred during Bioseal Library execution.

Implementation

String? getPrefix() {
  Pointer<Char> pPrefix = nullptr;
  Pointer<Int> pPrefixSize = calloc.allocate(1);
  pPrefixSize[0] = -1;
  try {
    var err = biosealSDK.id3Bioseal_GetPrefix(_pHandle.value, pPrefix, pPrefixSize);
    if (err == BiosealError.objectDoesNotExist.value) {
      return null;
    }
    if (err == BiosealError.insufficientBuffer.value) {
      pPrefix = calloc.allocate(pPrefixSize.value);
      err = biosealSDK.id3Bioseal_GetPrefix(_pHandle.value, pPrefix, pPrefixSize);
      if (err != BiosealError.success.value) {
        throw BiosealException(err);
      }
    }
    final vPrefix = utf8.decode(Uint8List.fromList(pPrefix.cast<Uint8>().asTypedList(pPrefixSize.value)));
    return vPrefix;
  } finally {
    calloc.free(pPrefix);
    calloc.free(pPrefixSize);
  }
}