Gets login parameters user name.
PRL_RESULT PrlLoginParams_GetUser( PRL_HANDLE hParams, PRL_STR pStr, PRL_UINT32_PTR pSz );
PrlApiDisp.h
PRL_RESULT. Possible values are:
PRL_ERR_INVALID_ARG - Invalid handle or null pointer was passed. PRL_ERR_BUFFER_OVERRUN - the size of the output buffer is not large enough. The parameter that is used to specify the size will contain the required size. PRL_ERR_SUCCESS - Function completed successfully.