RtlLoadString - NtDoc

#ifndef _NTRTL_H

// private
NTSYSAPI
NTSTATUS
NTAPI
RtlLoadString(
    _In_ PVOID DllHandle,
    _In_ ULONG StringId,
    _In_opt_ PCWSTR StringLanguage,
    _In_ ULONG Flags,
    _Out_ PCWSTR *ReturnString,
    _Out_opt_ PUSHORT ReturnStringLen,
    _Out_writes_(ReturnLanguageLen) PWSTR ReturnLanguageName,
    _Inout_opt_ PULONG ReturnLanguageLen
    );

#endif
View code on GitHub