By interpreting the highest bit as the negative sign and using 2’s complement as @matkatmusic suggested:

This only works when the integer size is set to **DWORD**.

Here is the translation of Core MIDI Error Constants:

```
kMIDIInvalidClient | -10830 | ffffd5b2
kMIDIInvalidPort | -10831 | ffffd5b1
kMIDIWrongEndpointType | -10832 | ffffd5b0
kMIDINoConnection | -10833 | ffffd5af
kMIDIUnknownEndpoint | -10834 | ffffd5ae
kMIDIUnknownProperty | -10835 | ffffd5ad
kMIDIWrongPropertyType | -10836 | ffffd5ac
kMIDINoCurrentSetup | -10837 | ffffd5ab
kMIDIMessageSendErr | -10838 | ffffd5aa
kMIDIServerStartErr | -10839 | ffffd5a9
kMIDISetupFormatErr | -10840 | ffffd5a8
kMIDIWrongThread | -10841 | ffffd5a7
kMIDIObjectNotFound | -10842 | ffffd5a6
kMIDIIDNotUnique | -10843 | ffffd5a5
kMIDINotPermitted | -10844 | ffffd5a4
kMIDIUnknownError | -10845 | ffffd5a3
```