c# - Attempted to read or write protected memory. This is often an indication that other memory is corrupt -

c# - Attempted to read or write protected memory. This is often an indication that other memory is corrupt -

i'm getting error while trying pass array of string c# c++. error appears sometimes, not always.

declaration in c#

[dllimport(reader_dll, callingconvention = callingconvention.stdcall, charset = charset.unicode)] public static extern void installedrooms(string[] rooms,int length);

in c++

void installedrooms(wchar_t const* const* values, int length); void detectorimpl::installedrooms(wchar_t const* const* values, int length) { logscope scope(log_, log::level::full, _t("detectorimpl::installedrooms"),this); std::vector<std::wstring> vstr(values, values + length); m_installedrooms=vstr; }

how invoked c#?

//list<string> installedrooms = new list<string>(); //installedrooms.add("r1"); //installedrooms.add("r1"); etc nativedetectorentrypoint.installedrooms(installedrooms.toarray(),installedrooms.count);

error raised at

attempted read or write protected memory. indication other memory corrupt. @ mh_detectorwrapper.nativedetectorentrypoint.installedrooms(string[] rooms, int32 length)

any help appreciated

this guess since error intermittent believe memory issue related string array installedrooms.

if not mark managed object using fixed keyword, gc may alter location of object @ time. thus, when seek access related memory location unmanaged code, may throw error.

you may seek following;

list<string> installedrooms = new list<string>(); installedrooms.add("r1"); installedrooms.add("r2"); string[] roomsarray = installedrooms.toarray(); fixed (char* p = roomsarray) { nativedetectorentrypoint.installedrooms(p, roomsarray.count); }

c# c++ dllimport access-violation