compiling error

[Nothxbye]

Jak fixnąc ten error, pasowalo by jakoś zastąpić tą linijke innym kodem.

int32_t LuaScriptInterface::luaDatabaseEscapeBlob(lua_State* L)
{
	uint32_t length = popNumber(L);
	DBQuery query;

	lua_pushstring(L, Database::instance()->escapeBlob(popString(L).c_str(), length).c_str()); ---- [COLOR="#FF0000"]Chodzi o ta linijke[/COLOR]
	return 1;
}

const char* LuaScriptInterface::popString(lua_State *L)
{
	lua_pop(L,1);
	const char* str = lua_tostring(L, 0);
	if(!str || strlen(str) == 0){
        return "";
    }

	return str;
}

error C2228: left of '.c_str' must have class/struct/union
type is 'const char *'