Does passing enumerated types to calllib only work up to enum values of 0x80000000?

I am calling a function in a DLL to get hold of the value corresponding to a certain enum name defined in a C header file. This DLL function simply looks like this:

EXPORTED unsigned long convertEnumNameToU32(LinIfParamName parameterName)
{
  return (unsigned long)parameterName;
}

The enum definition in the C header file looks like this:

typedef enum LinIfParamName 
{
  DUMMY0 = 0x7FFFFFFD,
  DUMMY1 = 0x7FFFFFFE,
  DUMMY2 = 0x7FFFFFFF,
  DUMMY3 = 0x80000000,
  DUMMY4 = 0x80000001,
  DUMMY5 = 0x80000002
} LinIfParamName;

Now, after loading the DLL with loadlibrary and calling the conversion function through calllib, like

calllib(obj.dpdLibraryName, 'convertEnumNameToU32', 'DUMMY0')

I only get the correct value returned for the first four enum names. All enum names having a value larger than 0x80000000 is returned as 0x80000000.

Is this a known limitation in loadlibrary or calllib?

[Cris Luengo]

An enum is an int, 0x7FFFFFFF is the largest possible value in an int. MATLAB doesn't wrap on overflow, it clamps. I'm guessing this issue is related to that.

Answer 1

[Stalin Samuel]

http://www.mathworks.in/help/matlab/matlab_oop/enumerations.html

[Johan Backström]

I can't find an answer to my question on that link which describes working with enumerations directly in matlab. My question concerns passing enumeration types by string to a C shared library. http://www.mathworks.se/help/matlab/matlab_external/pass-enumerated-types.html#btf6lke-1