# containsExtensionByName method

bool containsExtensionByName(

1. String? extensionName

)

Returns a value indicating whether the field (or one of its child fields) contains an extension with specified name.

param extensionName A string that identifies the extension. return A value indicating whether the field (or one of its child fields) contains the specified extension. throws BiosealException An error has occurred during Bioseal Library execution.

## Implementation

    bool containsExtensionByName(String? extensionName) {
      Pointer<Char>? pExtensionName = extensionName?.toNativeUtf8().cast<Char>();
      Pointer<Bool> pResult = calloc();
      try {
        var err = biosealSDK.id3BiosealField_ContainsExtensionByName(_pHandle.value, pExtensionName ?? nullptr, pResult);
        if (err != BiosealError.success.value) {
          throw BiosealException(err);
        }
        final vResult = pResult.value;
        return vResult;
      } finally {
        if (pExtensionName != null) {
          calloc.free(pExtensionName);
        }
        calloc.free(pResult);
      }
    }