Question

我想删除缓冲区文件，由比例尺中的值填充。到目前为止，这是我的代码。但是在达到定义的文件大小后，它会删除整个文件。

.parent {
  border: 1px solid orange;
  padding: 20px;
  width: 400px;
}

.parent .child {
  display: inline-block;
  height: 40px;
  background: blue;
  
  transition: width 0.5s ease 600s;
  width: 10px; /* why does this value has to be different ... */
  /* Hint: 
  If you hover the child until it reaches the 100px, then hover the
  parent without leaving the parent and keeping that hover for the
  transition-delay (600s) the width will become 10px as defined here.
  And removing this width property here won't make the transition work
  at all. */
}

.parent .child:hover {
  transition-delay: 0s;
  width: 100px;
}

.parent:not(:hover) .child {
  transition: width 0.5s ease 0s;
  width: 11px; /* ... from this value? */
  /* Hint:
  This is used as some kind of interruption of the 600s
  transition-delay in order to achieve the parent un-hover effect.
  I would like to set the width to 10px here as well but this will
  result in having no effect on the width of the enlarged child when
  un-hovering the parent. */
}

我相信有更好的方法。不删除整个文件并保留其中的las值。但是怎么样？希望有人可以提供帮助。

Answer 1

如果要从文件中删除前几个值，最好的方法是将其余值复制到第二个文件。然后，您可以使用新文件覆盖原始文件。这是一些示例代码。

    const string yourfile = "buffer1";
    const string tempfile = "buffer1edit.bin";

    System.IO.FileInfo fi = new System.IO.FileInfo(yourfile);
    if (fi.Length > 50)
    {
        using (System.IO.FileStream originalfile = System.IO.File.Open(yourfile, System.IO.FileMode.Open),
            newfile = System.IO.File.Open(tempfile, System.IO.FileMode.CreateNew))
        {
            originalfile.Seek(50, System.IO.SeekOrigin.Begin);
            originalfile.CopyTo(newfile);
        }

        System.IO.File.Delete(yourfile);
        System.IO.File.Move(tempfile, yourfile);
    }

防止超大缓冲文件的最佳方法？

1 个答案: