# containsKey method

bool containsKey(

1. String? key

)

Determines whether the ImageDictobject contains the specified key.

param key The key to locate in the Image object. return true if the Image object contains an element with the specified key, otherwise false. throws FaceException An error has occurred during Face Library execution.

## Implementation

    bool containsKey(String? key) {
      Pointer<Char>? pKey = key?.toNativeUtf8().cast<Char>();
      Pointer<Bool> pResult = calloc();
      try {
        var err = faceSDK.id3FaceImageDict_ContainsKey(_pHandle.value, pKey ?? nullptr, pResult);
        if (err != FaceError.success.value) {
          throw FaceException(err);
        }
        final vResult = pResult.value;
        return vResult;
      } finally {
        if (pKey != null) {
          calloc.free(pKey);
        }
        calloc.free(pResult);
      }
    }