# getDocumentDescription method

String? getDocumentDescription(

1. String? language

)

Gets the description of the document.

param language The expected language. return The description of the document. throws BiosealException An error has occurred during Bioseal Library execution.

## Implementation

    String? getDocumentDescription(String? language) {
      Pointer<Char>? pLanguage = language?.toNativeUtf8().cast<Char>();
      Pointer<Char> pDocumentDescription = nullptr;
      Pointer<Int> pDocumentDescriptionSize = calloc.allocate(1);
      pDocumentDescriptionSize[0] = -1;
      try {
        var err = biosealSDK.id3Bioseal_GetDocumentDescription(_pHandle.value, pLanguage ?? nullptr, pDocumentDescription, pDocumentDescriptionSize);
        if (err == BiosealError.objectDoesNotExist.value) {
          return null;
        }
        if (err == BiosealError.insufficientBuffer.value) {
          pDocumentDescription = calloc.allocate(pDocumentDescriptionSize.value);
          err = biosealSDK.id3Bioseal_GetDocumentDescription(_pHandle.value, pLanguage ?? nullptr, pDocumentDescription, pDocumentDescriptionSize);
          if (err != BiosealError.success.value) {
            throw BiosealException(err);
          }
        }
        final vDocumentDescription = utf8.decode(Uint8List.fromList(pDocumentDescription.cast<Uint8>().asTypedList(pDocumentDescriptionSize.value)));
        return vDocumentDescription;
      } finally {
        if (pLanguage != null) {
          calloc.free(pLanguage);
        }
        calloc.free(pDocumentDescription);
        calloc.free(pDocumentDescriptionSize);
      }
    }