stl中的大错误？为什么std :: iostream读取超过指定的数量

Question

#include <iostream>
#include <fstream>
using namespace std;

int main(void)
{
    int argSiz;
    void* argBuf;
    std::fstream fStream;
    fStream.open("E:/Fts/Proj/Test/DFVisionConsole_Proj/DFVisionConsole/solution/DFDevDefault.dfv", std::fstream::in | std::fstream::out | std::fstream::app);
    fStream.read((char*)&argSiz, 4);
    while(1)
    {
        long pos = fStream.tellg();
        fStream.read((char*)&argSiz, 4);
        long pos2 = fStream.tellg();
        argBuf = malloc(argSiz);
        fStream.read((char*)argBuf, argSiz);
        long pos3 = fStream.tellg();
        long mai = fStream.tellg();
    }
    return 0;
}

何时

fStream.read((char*)&argSiz, ETypebufSizeSize);//argSiz = 24103
long pos2 = fStream.tellg();//size2 = 130

然后

long pos3 = fStream.tellg();//pos3 = 24247

它不应该是24247,130 + 24103 = 24233.

为什么fstream读取的数量多于指定的数量？

您可以下载测试文件DFDevDefualt.dfv https://sourceforge.net/projects/genericlist/files/?source=navbar

请帮忙。