系统访问出界异常，尝试从flatbuffer的二进制文件访问"LengthofTable"

SystemAccessOutOfbound Exception while trying to access "LengthofTable" from flatbuffer's binary file

本文关键字：访问 flatbuffer 二进制文件 LengthofTable 出界 异常 系统      更新时间：2023-10-16

我正在根据以下架构存储我的数据。 

namespace iCalendarParser;
table EventParsed {
UID:string;
Organizer:string;
Summary:string;
Description:string;
Attendee:[string];
Categories:string;
DtEnd:string;
DtStart:string;
DtStamp:string;
AttendeeCounter:short;
}
table TableofEvents{
  events:[EventParsed];
}
root_type TableofEvents;

我在我的 c++ 应用程序中存储这样的数据。

   std::vector<flatbuffers::Offset<flatbuffers::String>> ListOfAttendee;
   std::vector<flatbuffers::Offset<iCalendarParser::EventParsed>> ListofEvents;

    for (auto EventList : ListofAllEvents)
    {
auto Organizer = builder.CreateString(EventList->Organizer);
auto UID = builder.CreateString(EventList->UID);
auto DtStart = builder.CreateString(EventList->DtStart);
auto DtEnd = builder.CreateString(EventList->DtEnd);
auto DtStamp = builder.CreateString(EventList->DtStamp);
auto Summary = builder.CreateString(EventList->Summary);
auto Description = builder.CreateString(EventList->Description);
auto Categories = builder.CreateString(EventList->Categories);
for (int i = 0; i < EventList->AttendeeCounter; i++)
{
    ListOfAttendee.push_back(builder.CreateString(EventList->Attendee[i]));
}

auto VectorListofAttendee = builder.CreateVector(ListOfAttendee);
auto CreatEventInFlatBuffer = CreateEventParsed(builder, UID, Organizer, Summary, Description, VectorListofAttendee, Categories, DtEnd, DtStart, DtStamp, EventList->AttendeeCounter);
ListofEvents.push_back(CreatEventInFlatBuffer);
 }
 auto CreatVectorOfEventInFlatbuffer = builder.CreateVector(ListofEvents);
 auto InsertEventInFlatBufferList = CreateTableofEvents(builder, 
 CreatVectorOfEventInFlatbuffer);
 builder.Finish(InsertEventInFlatBufferList);
 uint8_t *buf = builder.GetBufferPointer();
 int size = builder.GetSize();
 std::ofstream ofile("icalBin.bin", std::ios::binary);
 ofile.write((char *)&buf, size);
 ofile.close();

从我的 C# 应用程序中，我正在尝试访问反序列化数据。 

byte[] ReadbytesfromFile = File.ReadAllBytes("icalBin.bin");
var buffer = new ByteBuffer(ReadbytesfromFile);
var tableofEvents = TableofEvents.GetRootAsTableofEvents(buffer); 
int len = tableofEvents.EventsLength;

我无法弄清楚出了什么问题。谁能告诉我如何根据架构访问嵌套表并反序列化为 C#。

大意：

1.获取事件列表。

2.访问单个事件结构。（我试图得到的结果）

我在你的代码中看到 2 个问题：

  • 它缺少一个ListOfAttendee.clear()，您的嵌套循环导致此列表在每次迭代时都变大。
  • 您正在将指针数据写入文件，而不是指针指向的内容（删除&）。
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