问题描述
要在TStream类中移动当前字节指针，我们可以使用位置属性（例如MyStream.Position：= 0）或使用Seek方法（例如MyStream.Seek（0，soFromBeginning）。问题是，哪个是
To move the "current byte" pointer in TStream class we can use property Position (e.g. MyStream.Position := 0) or using Seek method (e.g. MyStream.Seek(0, soFromBeginning). The question is, which one is more efficient (aka faster)? (I don't have the source, so I could not check it myself).
到目前为止，我一直使用Seek来定位
So far I always use Seek in positioning that said pointer.
推荐答案
由于 TStream.Seek 是重载的函数，处理32或64位值，它取决于当前的流实现，这可能是更好的选择。
As TStream.Seek is an overloaded function handling 32-Bit or 64-Bit values, it depends on the current stream implementation, which might be the better choice.
例如 TCustomMemoryStream 实现32位版本的 Seek（）。在该流上设置 Position 时，首先调用64位版本，然后在调用32位版本时将值转换为Longint（这可能会随Delphi的64位版本而改变！）
For instance TCustomMemoryStream implements the 32-Bit version of Seek(). When you set Position on that stream this will first call the 64-Bit version, which casts the value to a Longint while calling the 32-Bit version. (This will probably change with a 64-Bit version of Delphi!)
另一方面，有一个 THandleStream 实现nts Seek（）的64位版本。当您使用32位值调用 Seek（）时，您会遇到一种非常讨厌的机制，称为64位版本。
On the other hand a THandleStream implements the 64-Bit version of Seek(). When you call Seek() with a 32-Bit value you end up in a quite nasty mechanism calling the 64-Bit version.
我个人的建议是设置 Position 。至少将来它将是更好的选择。
My personal advice would be to set Position. At least it will be the better choice in the future.
这篇关于TStream.Position与TStream.Seek的比较的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！